fix: 修复PreviewVideoPanel JSX结构-将视频+Canvas叠加层移出!showTitlePreview块

- 预览成功+Canvas标题叠加层提升到顶层，仅在 hasPreview 条件下渲染
- 空状态/生成中/生成失败/预览信息添加 !showTitlePreview 守卫
- 修复 Canvas overlay 在 showTitlePreview=true 时永远不渲染的死代码问题

alembic/versions/055_cover_templates.py

@@ -10,8 +10,6 @@ Changes:
 3. config 为 JSON 字段，存储封面配置信息
 """
 
-import json
-
 import sqlalchemy as sa
 
 from alembic import context, op
@@ -73,7 +71,7 @@ def upgrade() -> None:
                 name=name,
                 thumbnail_url="",
                 is_system=True,
-                config=json.dumps(config),
+                config=config,
                 created_at=sa.func.now(),
                 updated_at=sa.func.now(),
             )

alembic/versions/056_fix_cover_templates_config.py

@@ -0,0 +1,39 @@
+"""修复 cover_templates.config 双重序列化
+
+Revision ID: 056_fix_cover_templates_config
+Revises: 055_cover_templates
+Create Date: 2026-08-13
+
+问题: 055 迁移 seed 数据时 json.dumps(config) 导致 config 被双重序列化为 JSON 字符串
+例如 "{}"（字符串）而不是 {}（对象），导致 Pydantic CoverTemplateResponse 校验失败 500。
+
+修复: 从 JSON 字符串中提取文本值，再 cast 回 json 对象类型。
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "056_fix_cover_templates_config"
+down_revision = "055_cover_templates"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+
+    # PostgreSQL: 从 JSON string scalar 中提取文本内容，cast 为 json object
+    # 例如: JSON string "{}" -> text "{}" -> JSON object {}
+    if conn.dialect.name == "postgresql":
+        conn.execute(
+            sa.text(
+                "UPDATE cover_templates SET config = (config#>>'{}')::json "
+                "WHERE jsonb_typeof(config::jsonb) = 'string'"
+            )
+        )
+
+
+def downgrade() -> None:
+    # No safe rollback — the original data was incorrect
+    pass

apps/api/app/api/router.py

@@ -8,6 +8,7 @@ from app.api.routes.classification_jobs import router as classification_jobs_rou
 from app.api.routes.cover_templates import router as cover_templates_router
 from app.api.routes.duplication import router as duplication_router
 from app.api.routes.feature_flags import router as feature_flags_router
+from app.api.routes.generation_cover import router as generation_cover_router
 from app.api.routes.generation_preview import router as generation_preview_router
 from app.api.routes.generation_tasks import router as generation_tasks_router
 from app.api.routes.health import router as health_check_router
@@ -98,6 +99,11 @@ api_router.include_router(
     prefix="/generation",
     tags=["Generation"],
 )
+api_router.include_router(
+    generation_cover_router,
+    prefix="/generation",
+    tags=["Generation"],
+)
 api_router.include_router(
     titles_router,
     prefix="/titles",

apps/api/app/api/routes/cover_templates.py

@@ -7,7 +7,6 @@ API:
   DELETE /api/v1/cover-templates/{id}  - 删除自定义模板（系统模板不可删）
 """
 
-
 import logging
 from typing import Any
 
@@ -55,7 +54,7 @@ def list_cover_templates(
                 thumbnail_url=t.thumbnail_url,
                 is_system=t.is_system,
                 created_at=t.created_at,
-                config=t.config,
+                config=t.config or {},
             )
             for t in items
         ],

apps/api/app/api/routes/generation_cover.py

@@ -0,0 +1,337 @@
+"""封面生成路由 — Generation 模块.
+
+端点：
+- POST /generate-cover     AI 生成封面（从预览视频中抽帧）
+
+挂载路径: /api/v1/generation/generate-cover
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any, List, Optional
+
+from app.auth import AuthenticatedUser, get_current_user
+from app.dependencies import get_db_session, get_generated_video_repository
+from app.services.edit_plan_service import EditPlanService
+from app.services.edit_template_service import EditTemplateService
+from fastapi import APIRouter, Depends, HTTPException, Query
+from pydantic import BaseModel, Field
+from sqlalchemy.orm import Session
+
+from packages.adapters.sqlalchemy_impl.generation_task_repository import (
+    SQLAlchemyGenerationTaskRepository,
+)
+from packages.application import ListGeneratedVideosByTaskUseCase
+from packages.domain.config_schemas import normalize_plan_config
+
+from .templates_editor.dependencies import get_draft_plan_id, get_editor_services
+
+logger = logging.getLogger(__name__)
+router = APIRouter(tags=["Generation"])
+
+
+
+
+# ── Schemas ──────────────────────────────────────────────────────────────
+
+
+class GenerateCoverRequest(BaseModel):
+    """AI 封面生成请求体"""
+
+    asset_ids: List[str] = Field(default_factory=list, description="素材 ID 列表（确定视频来源）")
+    cover_type: str = Field(
+        default="ai_frame",
+        description="封面类型: ai_frame / manual / upload / ai_regenerate",
+    )
+    frame_time: Optional[float] = Field(
+        default=None,
+        ge=0.0,
+        description="手动选帧时间点（秒），仅 cover_type=manual 时有效",
+    )
+
+
+class GenerateCoverResponse(BaseModel):
+    """AI 封面生成响应体"""
+
+    plan_id: str = Field(..., description="剪辑计划 ID")
+    cover: dict[str, Any] = Field(..., description="封面数据（type / image_url / frame_time 等）")
+
+
+# ── Route ────────────────────────────────────────────────────────────────
+
+
+@router.post("/generate-cover", response_model=GenerateCoverResponse)
+def generate_cover(
+    body: GenerateCoverRequest,
+    template_id: str = Query(..., description="模板 ID"),
+    plan_id: str = Depends(get_draft_plan_id),
+    services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+) -> GenerateCoverResponse:
+    """AI 生成封面 — 从预览视频中抽帧.
+
+    流程（串行）：
+    1. 预览视频已渲染完成（通过 3 步查找获取 URL）
+    2. 用裸 URL 让 MediaKit 下载视频并抽帧
+    3. 帧图下载后上传到 OSS covers/ 路径
+    """
+    _, plan_svc = services
+    plan = plan_svc.get_plan_or_raise(plan_id)
+
+    # ── 3 步查找预览视频 URL ──────────────────────────────────────────
+    # 第一步：从 plan.config 读取
+    logger.info("[封面生成] 步骤1: 从 plan.config 查找 rendered_storage_key: plan_id=%s", plan_id)
+    rendered_storage_key = (plan.config or {}).get("rendered_storage_key", "")
+
+    # 第二步：如果还没有，通过 generation_task_id 查找预览任务的产物
+    if not rendered_storage_key:
+        generation_task_id = (plan.config or {}).get("generation_task_id", "")
+        logger.info(
+            "[封面生成] 步骤2: 通过 generation_task_id 查找: plan_id=%s task_id=%s", plan_id, generation_task_id
+        )
+        if generation_task_id:
+            try:
+                gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+                task = gen_task_repo.get(generation_task_id)
+                if task:
+                    video_repo = get_generated_video_repository(db)
+                    use_case = ListGeneratedVideosByTaskUseCase(video_repo)
+                    videos = use_case.execute(task.id)
+                    if videos:
+                        rendered_storage_key = getattr(videos[0], "file_url", "") or ""
+                        logger.info(
+                            "[封面生成] ✅ 步骤2找到视频: plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            generation_task_id,
+                            rendered_storage_key[:80],
+                        )
+            except Exception:
+                logger.warning(
+                    "封面生成: 通过 generation_task_id 查找视频失败: plan_id=%s",
+                    plan_id,
+                    exc_info=True,
+                )
+
+    # 第 2.5 步：通过 plan_id 作为 source_edit_plan_id 查找关联的已完成预览任务
+    if not rendered_storage_key:
+        try:
+            gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+            logger.info("[封面生成] 步骤2.5: 通过 source_edit_plan_id 查找: plan_id=%s", plan_id)
+            preview_tasks = gen_task_repo.list_by_source_edit_plan(plan_id)
+            for pt in preview_tasks:
+                if getattr(pt, "status", "") == "completed" and getattr(pt, "is_preview", False):
+                    video_repo = get_generated_video_repository(db)
+                    use_case = ListGeneratedVideosByTaskUseCase(video_repo)
+                    videos = use_case.execute(pt.id)
+                    if videos:
+                        rendered_storage_key = getattr(videos[0], "file_url", "") or ""
+                        logger.info(
+                            "[封面生成] ✅ 步骤2.5找到视频: plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            pt.id,
+                            rendered_storage_key[:80],
+                        )
+                        break
+        except Exception:
+            logger.warning(
+                "封面生成: 通过 source_edit_plan_id 查找预览任务失败: plan_id=%s",
+                plan_id,
+                exc_info=True,
+            )
+
+    # 第三步：按 user + template 查找最近的已完成预览任务（兜底）
+    if not rendered_storage_key:
+        try:
+            gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+            logger.info("[封面生成] 步骤3: 通过 user+template 查找: plan_id=%s template_id=%s", plan_id, template_id)
+            preview_tasks = gen_task_repo.list_latest_completed_preview(
+                user_id=str(current_user.user.id),
+                template_id=template_id,
+            )
+            if preview_tasks:
+                completed_preview = preview_tasks[0]
+                video_repo = get_generated_video_repository(db)
+                use_case = ListGeneratedVideosByTaskUseCase(video_repo)
+                videos = use_case.execute(completed_preview.id)
+                if videos:
+                    rendered_storage_key = getattr(videos[0], "file_url", "") or ""
+                    logger.info(
+                        "封面视频: 通过 user+template 找到预览任务: plan_id=%s template_id=%s task_id=%s",
+                        plan_id,
+                        template_id,
+                        completed_preview.id,
+                    )
+        except Exception:
+            logger.warning(
+                "封面警告: user+template 查找预览任务失败: plan_id=%s template_id=%s",
+                plan_id,
+                template_id,
+                exc_info=True,
+            )
+
+    # 仍然找不到才报 400
+    if not rendered_storage_key:
+        logger.error("[封面生成] ❌ 找不到预览视频: plan_id=%s", plan_id)
+        raise HTTPException(
+            status_code=400,
+            detail="请先生成预览视频，再生成封面",
+        )
+
+    # 回写到 plan.config
+    plan_svc.update_plan_config(plan_id, {"rendered_storage_key": rendered_storage_key})
+
+    # 使用裸 URL（rendered/* 已配置公开读）
+    primary_video_url = None
+    try:
+        if rendered_storage_key.startswith("http"):
+            primary_video_url = rendered_storage_key
+        else:
+            from packages.shared.storage import get_shared_storage_service
+
+            storage_svc = get_shared_storage_service()
+            primary_video_url = storage_svc.get_url(rendered_storage_key)
+        # 防御性规范化：合并路径中的双斜杠（// -> /），但保留协议头的 ://
+        # 历史数据中 project_id 为空时会产生 projects//tasks/ 路径，
+        # MediaKit 的 HTTP 客户端会规范化 URL 导致 404
+        if primary_video_url:
+            import re as _re
+
+            primary_video_url = _re.sub(r"(?<!:)//", "/", primary_video_url)
+        logger.info(
+            "获取预览视频URL用于封面生成: plan_id=%s url=%s",
+            plan_id,
+            primary_video_url[:80] if primary_video_url else "",
+        )
+    except Exception as e:
+        raise HTTPException(
+            status_code=500,
+            detail=f"获取预览视频URL失败: {e}",
+        ) from e
+
+    # 统一封面管道：优先从 GenerationTask.cover_url 读取渲染后视频抽帧的封面
+    # 多步查找 cover_url，和查找视频 URL 一样的 fallback 逻辑
+    if body.cover_type in ("ai_frame", "ai_regenerate"):
+        cover_url_from_task = None
+        gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+
+        # 步骤 A：通过 generation_task_id 直接查找
+        generation_task_id = (plan.config or {}).get("generation_task_id", "")
+        if generation_task_id:
+            try:
+                task = gen_task_repo.get(generation_task_id)
+                if task and getattr(task, "cover_url", ""):
+                    cover_url_from_task = task.cover_url
+                    logger.info(
+                        "[封面生成] 统一管道封面(步骤A-direct): plan_id=%s task_id=%s url=%s",
+                        plan_id,
+                        generation_task_id,
+                        cover_url_from_task[:80],
+                    )
+            except Exception:
+                logger.warning(
+                    "[封面生成] 步骤A读取 cover_url 失败: plan_id=%s task_id=%s",
+                    plan_id,
+                    generation_task_id,
+                    exc_info=True,
+                )
+
+        # 步骤 B：通过 source_edit_plan_id 查找关联预览任务的 cover_url
+        if not cover_url_from_task:
+            try:
+                preview_tasks = gen_task_repo.list_by_source_edit_plan(plan_id)
+                for pt in preview_tasks:
+                    if getattr(pt, "status", "") == "completed" and getattr(pt, "cover_url", ""):
+                        cover_url_from_task = pt.cover_url
+                        logger.info(
+                            "[封面生成] 统一管道封面(步骤B-source_plan): plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            pt.id,
+                            cover_url_from_task[:80],
+                        )
+                        break
+            except Exception:
+                logger.warning(
+                    "[封面生成] 步骤B查找 cover_url 失败: plan_id=%s",
+                    plan_id,
+                    exc_info=True,
+                )
+
+        # 步骤 C：通过 user+template 查找最近的已完成预览任务的 cover_url
+        if not cover_url_from_task:
+            try:
+                preview_tasks = gen_task_repo.list_latest_completed_preview(
+                    user_id=str(current_user.user.id),
+                    template_id=template_id,
+                )
+                for pt in preview_tasks:
+                    if getattr(pt, "cover_url", ""):
+                        cover_url_from_task = pt.cover_url
+                        logger.info(
+                            "[封面生成] 统一管道封面(步骤C-user+template): plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            pt.id,
+                            cover_url_from_task[:80],
+                        )
+                        break
+            except Exception:
+                logger.warning(
+                    "[封面生成] 步骤C查找 cover_url 失败: plan_id=%s template_id=%s",
+                    plan_id,
+                    template_id,
+                    exc_info=True,
+                )
+
+        if cover_url_from_task:
+            # 标题已在预览视频渲染时烧录（ASS字幕），封面帧自然包含标题
+            cover_data = {
+                "type": "ai_frame",
+                "image_url": cover_url_from_task,
+                "frame_time": 0.0,
+                "confidence": 0.95,
+            }
+            current_config = dict(plan.config) if plan.config else {}
+            current_config["cover"] = cover_data
+            normalized = normalize_plan_config(current_config)
+            plan_svc.update_plan_config(plan_id, {"cover": normalized["cover"]})
+            return GenerateCoverResponse(plan_id=plan_id, cover=cover_data)
+
+        logger.warning(
+            "[封面生成] 统一管道未找到 cover_url: plan_id=%s",
+            plan_id,
+        )
+        # ai_frame/ai_regenerate 类型必须从渲染管道获取，不再回退到 AI 服务
+        raise HTTPException(
+            status_code=400,
+            detail="封面尚未生成，请先重新生成预览视频以触发封面自动提取",
+        )
+
+    from packages.shared.ai_service import run_generate_cover
+
+    try:
+        logger.info("[封面生成] 开始调用 AI 封面生成服务: plan_id=%s", plan_id)
+        cover_data = run_generate_cover(
+            plan_id=plan_id,
+            asset_ids=body.asset_ids,
+            cover_type=body.cover_type,
+            frame_time=body.frame_time,
+            primary_video_url=primary_video_url,
+        )
+    except RuntimeError as e:
+        raise HTTPException(status_code=500, detail=str(e)) from e
+
+    current_config = dict(plan.config) if plan.config else {}
+    current_config["cover"] = cover_data
+    normalized = normalize_plan_config(current_config)
+    plan_svc.update_plan_config(plan_id, {"cover": normalized["cover"]})
+
+    logger.info(
+        "封面生成完成: template_id=%s plan_id=%s type=%s by user=%s",
+        template_id,
+        plan_id,
+        body.cover_type,
+        current_user.user.id,
+    )
+
+    return GenerateCoverResponse(plan_id=plan_id, cover=cover_data)

apps/api/app/api/routes/generation_preview.py

@@ -5,6 +5,7 @@
 
 from __future__ import annotations
 
+import json
 import logging
 
 from app.auth import AuthenticatedUser, get_current_user
@@ -267,6 +268,20 @@ def create_preview_generation_task(
     # 从模板读取 editing_mode / mode 作为 strategy_id（渲染 pipeline 的 mode 参数）
     strategy_id = _resolve_strategy_id_from_template(request.template_id, db, user_id)
 
+    # 处理标题配置：如果有标题文本，序列化到 custom_title 字段传递给 worker
+    title_config = request.title_config or {}
+    title_text = (title_config.get("text") or "").strip()
+    custom_title_value = ""
+    if title_text:
+        # 将标题文本和样式配置序列化为 JSON 存入 custom_title
+        # Worker 端会解析 JSON 获取完整标题配置
+        custom_title_value = json.dumps(title_config, ensure_ascii=False)
+        logger.info(
+            "[预览生成] 标题配置: text=%s, config_keys=%s",
+            title_text[:30],
+            list(title_config.keys()),
+        )
+
     use_case = CreateGenerationTaskUseCase(generation_task_repository)
 
     try:
@@ -290,6 +305,7 @@ def create_preview_generation_task(
                 auto_retry_enabled=False,
                 auto_retry_max=0,
                 is_preview=True,
+                custom_title=custom_title_value,
             )
         )
     except ValueError as e:

apps/api/app/api/routes/templates_editor/__init__.py

@@ -11,7 +11,6 @@
 - bgm.py:            BGM 管理
 - effects.py:        转场 + 滤镜
 - export.py:         导出配置
-- cover.py:          封面管理 + AI 生成封面
 - subtitles.py:      字幕管理
 - ai_features.py:    AI 推荐
 - generation.py:     生成（触发/进度/记录）
@@ -31,7 +30,6 @@ from .adjustments import router as adjustments_router
 from .ai_features import router as ai_features_router
 from .bgm import router as bgm_router
 from .clips import router as clips_router
-from .cover import router as cover_router
 from .dependencies import get_draft_plan_id, get_editor_services  # noqa: F401
 from .draft import router as draft_router
 from .effects import router as effects_router
@@ -51,7 +49,6 @@ _sub_routers = [
     bgm_router,
     effects_router,
     export_router,
-    cover_router,
     subtitles_router,
     ai_features_router,
     generation_router,

apps/api/app/api/routes/templates_editor/cover.py

@@ -1,168 +0,0 @@
-"""封面管理路由.
-
-端点：
-- POST /generate-cover     AI 生成封面（从预览视频中抽帧）
-"""
-
-from __future__ import annotations
-
-import logging
-
-from app.auth import AuthenticatedUser, get_current_user
-from app.dependencies import get_db_session, get_generated_video_repository
-from app.services.edit_plan_service import EditPlanService
-from app.services.edit_template_service import EditTemplateService
-from fastapi import APIRouter, Depends, HTTPException
-from sqlalchemy.orm import Session
-
-from packages.adapters.sqlalchemy_impl.generation_task_repository import (
-    SQLAlchemyGenerationTaskRepository,
-)
-from packages.application import ListGeneratedVideosByTaskUseCase
-from packages.domain.config_schemas import normalize_plan_config
-
-from .dependencies import get_draft_plan_id, get_editor_services
-from .schemas import (
-    GenerateCoverRequest,
-    GenerateCoverResponse,
-)
-
-logger = logging.getLogger(__name__)
-router = APIRouter(tags=["Template Editor"])
-
-
-@router.post("/generate-cover", response_model=GenerateCoverResponse)
-def editor_generate_cover(
-    template_id: str,
-    body: GenerateCoverRequest,
-    plan_id: str = Depends(get_draft_plan_id),
-    services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
-    db: Session = Depends(get_db_session),
-    current_user: AuthenticatedUser = Depends(get_current_user),
-) -> GenerateCoverResponse:
-    """AI 生成封面 — 从预览视频中抽帧.
-
-    流程（串行）：
-    1. 预览视频已渲染完成（通过 3 步查找获取 URL）
-    2. 用裸 URL 让 MediaKit 下载视频并抽帧
-    3. 帧图下载后上传到 OSS covers/ 路径
-    """
-    _, plan_svc = services
-    plan = plan_svc.get_plan_or_raise(plan_id)
-
-    # ── 3 步查找预览视频 URL ──────────────────────────────────────────
-    # 第一步：从 plan.config 读取
-    rendered_storage_key = (plan.config or {}).get("rendered_storage_key", "")
-
-    # 第二步：如果还没有，通过 generation_task_id 查找预览任务的产物
-    if not rendered_storage_key:
-        generation_task_id = (plan.config or {}).get("generation_task_id", "")
-        if generation_task_id:
-            try:
-                gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
-                task = gen_task_repo.get(generation_task_id)
-                if task:
-                    video_repo = get_generated_video_repository(db)
-                    use_case = ListGeneratedVideosByTaskUseCase(video_repo)
-                    videos = use_case.execute(task.id)
-                    if videos:
-                        rendered_storage_key = getattr(videos[0], "file_url", "") or ""
-                        logger.info(
-                            "封面生成: 通过 generation_task_id 找到视频: plan_id=%s task_id=%s",
-                            plan_id,
-                            generation_task_id,
-                        )
-            except Exception:
-                logger.warning(
-                    "封面生成: 通过 generation_task_id 查找视频失败: plan_id=%s",
-                    plan_id,
-                    exc_info=True,
-                )
-
-    # 第三步：按 user + template 查找最近的已完成预览任务（兜底）
-    if not rendered_storage_key:
-        try:
-            gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
-            preview_tasks = gen_task_repo.list_latest_completed_preview(
-                user_id=str(current_user.user.id),
-                template_id=template_id,
-            )
-            if preview_tasks:
-                completed_preview = preview_tasks[0]
-                video_repo = get_generated_video_repository(db)
-                use_case = ListGeneratedVideosByTaskUseCase(video_repo)
-                videos = use_case.execute(completed_preview.id)
-                if videos:
-                    rendered_storage_key = getattr(videos[0], "file_url", "") or ""
-                    logger.info(
-                        "封面视频: 通过 user+template 找到预览任务: plan_id=%s template_id=%s task_id=%s",
-                        plan_id,
-                        template_id,
-                        completed_preview.id,
-                    )
-        except Exception:
-            logger.warning(
-                "封面警告: user+template 查找预览任务失败: plan_id=%s template_id=%s",
-                plan_id,
-                template_id,
-                exc_info=True,
-            )
-
-    # 仍然找不到才报 400
-    if not rendered_storage_key:
-        raise HTTPException(
-            status_code=400,
-            detail="请先生成预览视频，再生成封面",
-        )
-
-    # 回写到 plan.config
-    plan_svc.update_plan_config(plan_id, {"rendered_storage_key": rendered_storage_key})
-
-    # 使用裸 URL（rendered/* 已配置公开读）
-    primary_video_url = None
-    try:
-        if rendered_storage_key.startswith("http"):
-            primary_video_url = rendered_storage_key
-        else:
-            from packages.shared.storage import get_shared_storage_service
-
-            storage_svc = get_shared_storage_service()
-            primary_video_url = storage_svc.get_url(rendered_storage_key)
-        logger.info(
-            "获取预览视频URL用于封面生成: plan_id=%s url=%s",
-            plan_id,
-            primary_video_url[:80] if primary_video_url else "",
-        )
-    except Exception as e:
-        raise HTTPException(
-            status_code=500,
-            detail=f"获取预览视频URL失败: {e}",
-        ) from e
-
-    from packages.shared.ai_service import run_generate_cover
-
-    try:
-        cover_data = run_generate_cover(
-            plan_id=plan_id,
-            asset_ids=body.asset_ids,
-            cover_type=body.cover_type,
-            frame_time=body.frame_time,
-            primary_video_url=primary_video_url,
-        )
-    except RuntimeError as e:
-        raise HTTPException(status_code=500, detail=str(e)) from e
-
-    current_config = dict(plan.config) if plan.config else {}
-    current_config["cover"] = cover_data
-    normalized = normalize_plan_config(current_config)
-    plan_svc.update_plan_config(plan_id, {"cover": normalized["cover"]})
-
-    logger.info(
-        "封面生成完成: template_id=%s plan_id=%s type=%s by user=%s",
-        template_id,
-        plan_id,
-        body.cover_type,
-        current_user.user.id,
-    )
-
-    return GenerateCoverResponse(plan_id=plan_id, cover=cover_data)

apps/api/app/api/routes/templates_editor/generation.py

@@ -223,7 +223,12 @@ def _get_task_output_url(task, gen_task_repo, db) -> str:
         use_case = ListGeneratedVideosByTaskUseCase(video_repo)
         videos = use_case.execute(task.id)
         if videos:
-            return getattr(videos[0], "file_url", "") or ""
+            url = getattr(videos[0], "file_url", "") or ""
+            # 规范化：合并路径中的双斜杠（保留协议头 ://）
+            if url:
+                import re as _re
+                url = _re.sub(r"(?<!:)//", "/", url)
+            return url
     except Exception:
         pass
     return ""

apps/api/app/api/routes/templates_editor/schemas.py

@@ -99,29 +99,6 @@ class AIRecommendResponse(BaseModel):
     confidence: float = Field(..., ge=0.0, le=1.0, description="AI 推荐置信度 (0~1)")
 
 
-# ── 封面生成 ────────────────────────────────────────────────────────────────
-
-
-class GenerateCoverRequest(BaseModel):
-    """AI 封面生成请求体"""
-
-    asset_ids: List[str] = Field(default_factory=list, description="素材 ID 列表（确定视频来源）")
-    cover_type: str = Field(
-        default="ai_frame",
-        description="封面类型: ai_frame / manual / upload / ai_regenerate",
-    )
-    frame_time: Optional[float] = Field(
-        default=None,
-        ge=0.0,
-        description="手动选帧时间点（秒），仅 cover_type=manual 时有效",
-    )
-
-
-class GenerateCoverResponse(BaseModel):
-    """AI 封面生成响应体"""
-
-    plan_id: str = Field(..., description="剪辑计划 ID")
-    cover: dict[str, Any] = Field(..., description="封面数据（type / image_url / frame_time 等）")
 
 
 # ── BGM ────────────────────────────────────────────────────────────────────

apps/api/app/schemas/generation_task.py

@@ -7,8 +7,8 @@ from pydantic import BaseModel, Field, field_validator, model_validator
 class ConfirmGenerationRequest(BaseModel):
     """确认生成请求体 — 基于预览任务创建正式生成任务"""
 
-    output_width: int = Field(default=1080, description="输出视频宽度")
-    output_height: int = Field(default=1920, description="输出视频高度")
+    output_width: int = Field(default=1080, ge=100, description="输出视频宽度")
+    output_height: int = Field(default=1920, ge=100, description="输出视频高度")
     cover_url: str = Field(default="", description="自定义封面图片 URL")
     custom_title: str = Field(default="", description="自定义视频标题")
 
@@ -181,6 +181,10 @@ class CreatePreviewGenerationTaskRequest(BaseModel):
         default="",
         description="关联的编辑计划ID（可选），用于确认生成时复用预览产物",
     )
+    title_config: dict = Field(
+        default_factory=dict,
+        description="标题配置（可选），渲染时烧录到预览视频中。支持字段: text/font/font_size/font_color/position/bold/stroke/shadow",
+    )
 
     @model_validator(mode="after")
     def _check_template_id(self) -> "CreatePreviewGenerationTaskRequest":

apps/api/app/services/cover_service.py

@@ -1,278 +0,0 @@
-"""封面管理服务.
-
-提供封面配置管理和从视频抽帧生成封面的能力。
-抽帧使用 FFmpeg，上传使用共享存储服务。
-"""
-
-from __future__ import annotations
-
-import logging
-import tempfile
-from pathlib import Path
-from typing import Any, Dict
-
-logger = logging.getLogger(__name__)
-
-
-# ── 常量 ──────────────────────────────────────────────────────────────────────
-
-DEFAULT_COVER_WIDTH = 1080
-DEFAULT_COVER_HEIGHT = 1920
-DEFAULT_COVER_QUALITY = 5  # JPEG quality (1-31, 越小越好)
-COVER_STORAGE_PREFIX = "covers"
-
-
-class CoverService:
-    """封面管理服务."""
-
-    def __init__(self, storage_service: Any, asset_repository: Any) -> None:
-        self._storage = storage_service
-        self._asset_repo = asset_repository
-
-    # ── 配置读写 ──────────────────────────────────────────────────────────
-
-    @staticmethod
-    def get_cover_config(plan_config: Dict[str, Any]) -> Dict[str, Any]:
-        """从 plan.config 中提取封面配置.
-
-        Args:
-            plan_config: 剪辑计划的 config 字段
-
-        Returns:
-            封面配置 dict
-        """
-        cover = plan_config.get("cover", {})
-        if not isinstance(cover, dict):
-            cover = {}
-        # 确保默认字段存在
-        return {
-            "type": cover.get("type", "ai_frame"),
-            "image_url": cover.get("image_url", ""),
-            "frame_time": cover.get("frame_time"),
-        }
-
-    # ── 抽帧生成封面 ──────────────────────────────────────────────────────
-
-    def extract_cover_from_clip(
-        self,
-        plan_id: str,
-        asset_id: str,
-        frame_time: float = 1.0,
-        *,
-        width: int = DEFAULT_COVER_WIDTH,
-        height: int = DEFAULT_COVER_HEIGHT,
-        quality: int = DEFAULT_COVER_QUALITY,
-    ) -> Dict[str, Any]:
-        """从指定素材的指定时间点抽取一帧作为封面.
-
-        Args:
-            plan_id: 剪辑计划 ID（用于生成存储路径）
-            asset_id: 素材 ID
-            frame_time: 抽帧时间点（秒）
-            width: 输出宽度
-            height: 输出高度
-            quality: JPEG 质量
-
-        Returns:
-            封面数据 dict，包含 type / image_url / frame_time
-
-        Raises:
-            ValueError: 素材不存在或不是视频
-            RuntimeError: 抽帧或上传失败
-        """
-        # 1. 获取素材
-        asset = self._asset_repo.get(asset_id) if self._asset_repo else None
-        if not asset:
-            raise ValueError(f"素材不存在: {asset_id}")
-
-        storage_key = getattr(asset, "storage_key", "")
-        if not storage_key:
-            raise ValueError(f"素材没有文件: {asset_id}")
-
-        mime_type = getattr(asset, "mime_type", "")
-        if mime_type and not mime_type.startswith("video"):
-            raise ValueError(f"素材不是视频类型: {mime_type}")
-
-        # 2. 下载视频到临时目录
-        with tempfile.TemporaryDirectory(prefix="cover_extract_") as tmp_dir:
-            tmp_path = Path(tmp_dir)
-            video_path = tmp_path / f"source_{asset_id[:8]}"
-
-            logger.info("下载素材用于封面抽帧: asset_id=%s", asset_id)
-            try:
-                self._storage.download_file(storage_key, str(video_path))
-            except Exception as e:
-                raise RuntimeError(f"下载素材失败: {e}") from e
-
-            if not video_path.exists() or video_path.stat().st_size == 0:
-                raise RuntimeError("下载的素材文件为空")
-
-            # 3. FFmpeg 抽帧
-            output_path = tmp_path / "cover.jpg"
-            self._extract_frame(
-                video_path=video_path,
-                output_path=output_path,
-                time_sec=frame_time,
-                width=width,
-                height=height,
-                quality=quality,
-            )
-
-            if not output_path.exists() or output_path.stat().st_size == 0:
-                raise RuntimeError("封面抽帧失败")
-
-            # 4. 上传到 OSS
-            cover_key = f"{COVER_STORAGE_PREFIX}/{plan_id}/cover_{int(frame_time * 1000)}.jpg"
-            logger.info("上传封面到存储: key=%s", cover_key)
-
-            try:
-                self._storage.upload_file(
-                    file_or_path=str(output_path),
-                    storage_key=cover_key,
-                    content_type="image/jpeg",
-                )
-            except Exception as e:
-                raise RuntimeError(f"上传封面失败: {e}") from e
-
-            # 5. 获取访问 URL
-            try:
-                image_url = self._storage.get_url(cover_key)
-            except Exception:
-                image_url = cover_key  # 降级为 storage_key
-
-        logger.info(
-            "封面抽帧完成: plan_id=%s asset_id=%s time=%.2fs size=%d",
-            plan_id,
-            asset_id,
-            frame_time,
-            output_path.stat().st_size if output_path.exists() else 0,
-        )
-
-        return {
-            "type": "manual",
-            "image_url": image_url,
-            "frame_time": frame_time,
-        }
-
-    def generate_smart_cover(
-        self,
-        plan_id: str,
-        asset_id: str,
-        *,
-        width: int = DEFAULT_COVER_WIDTH,
-        height: int = DEFAULT_COVER_HEIGHT,
-        quality: int = DEFAULT_COVER_QUALITY,
-    ) -> Dict[str, Any]:
-        """智能选帧：从视频中选取多帧，选最清晰的一帧.
-
-        Args:
-            plan_id: 剪辑计划 ID
-            asset_id: 素材 ID
-            width: 输出宽度
-            height: 输出高度
-            quality: JPEG 质量
-
-        Returns:
-            封面数据 dict
-        """
-        # 简单实现：取视频 1/3 处的帧作为智能封面
-        # 更复杂的多帧选清晰帧可以后续优化
-        frame_time = 3.0  # 默认第3秒，后续可以根据视频时长动态计算
-
-        result = self.extract_cover_from_clip(
-            plan_id=plan_id,
-            asset_id=asset_id,
-            frame_time=frame_time,
-            width=width,
-            height=height,
-            quality=quality,
-        )
-        result["type"] = "ai_frame"
-        return result
-
-    # ── 内部方法 ──────────────────────────────────────────────────────────
-
-    @staticmethod
-    def _extract_frame(
-        video_path: Path,
-        output_path: Path,
-        *,
-        time_sec: float,
-        width: int,
-        height: int,
-        quality: int,
-    ) -> None:
-        """使用 FFmpeg 从视频中抽取一帧.
-
-        Args:
-            video_path: 视频文件路径
-            output_path: 输出图片路径
-            time_sec: 抽帧时间点（秒）
-            width: 输出宽度
-            height: 输出高度
-            quality: JPEG 质量
-        """
-        import subprocess
-
-        # scale + crop 实现 cover 裁剪
-        vf = f"scale={width}:{height}:force_original_aspect_ratio=increase," f"crop={width}:{height},format=yuvj420p"
-
-        command = [
-            "ffmpeg",
-            "-y",
-            "-ss",
-            f"{time_sec:.3f}",
-            "-i",
-            str(video_path),
-            "-vframes",
-            "1",
-            "-vf",
-            vf,
-            "-q:v",
-            str(quality),
-            "-f",
-            "mjpeg",
-            str(output_path),
-        ]
-
-        logger.debug("FFmpeg 抽帧命令: %s", " ".join(command))
-
-        try:
-            result = subprocess.run(
-                command,
-                capture_output=True,
-                text=True,
-                timeout=60,
-            )
-            if result.returncode != 0:
-                logger.warning("FFmpeg 抽帧返回非零: %s\nstderr: %s", result.returncode, result.stderr[-500:])
-                # 尝试不使用 scale+crop 的简化命令
-                simple_command = [
-                    "ffmpeg",
-                    "-y",
-                    "-ss",
-                    f"{time_sec:.3f}",
-                    "-i",
-                    str(video_path),
-                    "-vframes",
-                    "1",
-                    "-q:v",
-                    str(quality),
-                    "-pix_fmt",
-                    "yuvj420p",
-                    "-f",
-                    "mjpeg",
-                    str(output_path),
-                ]
-                result2 = subprocess.run(
-                    simple_command,
-                    capture_output=True,
-                    text=True,
-                    timeout=60,
-                )
-                if result2.returncode != 0:
-                    raise RuntimeError(f"FFmpeg 抽帧失败: {result2.stderr[-300:]}")
-        except subprocess.TimeoutExpired as e:
-            raise RuntimeError("FFmpeg 抽帧超时") from e
-        except FileNotFoundError as e:
-            raise RuntimeError("FFmpeg 不可用") from e

apps/web/e2e/core-generation.spec.ts

@@ -200,15 +200,7 @@ test.describe("Core generation flow", () => {
     await expect(page.getByRole("heading", { name: /选择配音/ })).toBeVisible({ timeout: 15000 })
     await page.getByRole("button", { name: "下一步" }).click()
 
-    // Step 4: preview — 需要先生成预览视频，才能进入下一步
-    await expect(page.getByRole("heading", { name: /生成预览/ })).toBeVisible({ timeout: 15000 })
-    // 点击"生成预览"按钮触发预览生成
-    await page.locator(".xx-preview-generate-btn").click()
-    // 等待预览生成完成（后端渲染，可能需要较长时间）
-    await expect(page.getByText("预览生成成功")).toBeVisible({ timeout: 300_000 })
-    await page.getByRole("button", { name: "下一步" }).click()
-
-    // Step 5: title
+    // Step 4: title（新顺序：标题在预览之前）
     await expect(page.getByRole("heading", { name: /选择标题/ })).toBeVisible({ timeout: 15000 })
     // 等待组件完全渲染
     await page.waitForTimeout(2000)
@@ -222,6 +214,14 @@ test.describe("Core generation flow", () => {
     await titleInput.fill(titleText)
     await page.getByRole("button", { name: "下一步" }).click()
 
+    // Step 5: preview — 需要先生成预览视频，才能进入下一步
+    await expect(page.getByRole("heading", { name: /生成预览/ })).toBeVisible({ timeout: 15000 })
+    // 点击"生成预览"按钮触发预览生成
+    await page.locator(".xx-preview-generate-btn").click()
+    // 等待预览生成完成（后端渲染，可能需要较长时间）
+    await expect(page.getByText("预览生成成功")).toBeVisible({ timeout: 300_000 })
+    await page.getByRole("button", { name: "下一步" }).click()
+
     // Step 6: cover (默认 AI 智能选帧模式，直接下一步)
     await expect(page.getByRole("heading", { name: /选择封面/ })).toBeVisible({ timeout: 15000 })
     await page.getByRole("button", { name: "下一步" }).click()
@@ -258,9 +258,12 @@ test.describe("Core generation flow", () => {
     // Generate API may return 400 in test env if template has no ready segments
     // That is OK for a wizard flow smoke test
     if (genResp.ok()) {
-      const genData = (await genResp.json()) as { plan_id: string; generation_task_id: string }
-      expect(genData.plan_id).toBeTruthy()
-      expect(genData.generation_task_id).toBeTruthy()
+      const genData = (await genResp.json()) as {
+        items: Array<{ id: string; status: string }>
+        total: number
+      }
+      expect(genData.items.length).toBeGreaterThan(0)
+      expect(genData.items[0].id).toBeTruthy()
     } else {
       console.log(`[E2E] Generate API returned ${genResp.status()}, wizard flow test still passes`)
     }

apps/web/src/api/cover-templates.ts

@@ -3,7 +3,7 @@
  * 后端路由: /api/v1/cover-templates
  */
 import apiClient from "./client"
-import type { CoverTemplate } from "@/pages/editing-planner/types"
+import type { CoverTemplate } from "@/pages/generate/types/cover"
 
 export interface CoverTemplateListResponse {
   items: CoverTemplate[]

apps/web/src/api/editing-planner/types.ts

@@ -8,8 +8,8 @@ import type {
   FilterConfig,
   ChromaKeyConfig,
   StickerConfig,
-  CoverConfig,
 } from "@/pages/editing-planner/types"
+import type { CoverConfig } from "@/pages/generate/types/cover"
 
 /** 模板模式（后端枚举值） */
 export type TemplateMode = "pip" | "voice_over" | "one_take" | "voice_pip"

apps/web/src/api/generation/confirm.ts

@@ -7,7 +7,7 @@ export const confirmGeneration = async (
   params: ConfirmGenerationRequest,
 ): Promise<ConfirmGenerationResponse> => {
   const response = await apiClient.post<ConfirmGenerationResponse>(
-    `/tasks/${taskId}/confirm`,
+    `/generation/tasks/${taskId}/confirm`,
     params,
   )
   return response.data

apps/web/src/api/generation/cover.ts

@@ -0,0 +1,35 @@
+import apiClient from "../client"
+
+export interface GenerateCoverRequest {
+  asset_ids: string[]
+  cover_type?: "ai_frame" | "manual" | "upload" | "ai_regenerate"
+  frame_time?: number
+}
+
+export interface GenerateCoverResponse {
+  plan_id: string
+  cover: {
+    scheme?: string
+    asset_id?: string
+    frame_time?: number
+    image_url?: string
+    thumbnail_url?: string
+    [key: string]: unknown
+  }
+}
+
+/** AI 生成封面 — 从预览视频中抽帧 */
+export async function generateCover(
+  templateId: string,
+  data: GenerateCoverRequest,
+): Promise<GenerateCoverResponse> {
+  const response = await apiClient.post<GenerateCoverResponse>(
+    "/generation/generate-cover",
+    { ...data, template_id: templateId },
+    {
+      timeout: 300000,
+      params: { template_id: templateId },
+    },
+  )
+  return response.data
+}

apps/web/src/api/generation/index.ts

@@ -10,3 +10,6 @@ export type {
 
 export { createPreview, getPreviewStatus } from "./preview"
 export { confirmGeneration } from "./confirm"
+
+export { generateCover } from "./cover"
+export type { GenerateCoverRequest, GenerateCoverResponse } from "./cover"

apps/web/src/api/generation/types.ts

@@ -13,6 +13,17 @@ export interface CreatePreviewRequest {
   video_title?: string
   duration?: number
   video_ratio?: string
+  /* 标题烧录配置（可选，传入后 ASS 渲染标题到预览视频中） */
+  title_config?: {
+    text?: string
+    font?: string
+    font_size?: number
+    font_color?: string
+    position?: string
+    bold?: boolean
+    stroke?: boolean
+    shadow?: boolean
+  }
   bgm_config?: {
     enabled: boolean
     preset_id?: string

apps/web/src/api/template-editor/aiFeatures.ts

@@ -1,13 +1,8 @@
 /**
- * AI 推荐 + 封面生成 API
+ * AI 推荐 API
  */
 import apiClient from "../client"
-import type {
-  AIRecommendRequest,
-  AIRecommendResponse,
-  GenerateCoverRequest,
-  GenerateCoverResponse,
-} from "./types"
+import type { AIRecommendRequest, AIRecommendResponse } from "./types"
 
 /** AI 推荐片段方案 */
 export async function aiRecommendClips(
@@ -17,14 +12,3 @@ export async function aiRecommendClips(
   const response = await apiClient.post(`/templates/${templateId}/editor/ai-recommend`, data)
   return response.data
 }
-
-/** AI 生成封面 */
-export async function generateCover(
-  templateId: string,
-  data: GenerateCoverRequest,
-): Promise<GenerateCoverResponse> {
-  const response = await apiClient.post(`/templates/${templateId}/editor/generate-cover`, data, {
-    timeout: 180000, // 封面生成涉及 MediaKit 抽帧，最长 180 秒
-  })
-  return response.data
-}

apps/web/src/api/template-editor/index.ts

@@ -27,9 +27,6 @@ export type {
   AIRecommendRequest,
   AIRecommendClipItem,
   AIRecommendResponse,
-  GenerateCoverRequest,
-  GenerateCoverResponse,
-  CoverResult,
   EditPlanClipStatus,
   EditPlanClip,
   CreateEditPlanClipRequest,
@@ -81,8 +78,8 @@ export {
   createClipsFromAssets,
 } from "./clips"
 
-// AI 推荐 + 封面生成
-export { aiRecommendClips, generateCover } from "./aiFeatures"
+// AI 推荐
+export { aiRecommendClips } from "./aiFeatures"
 
 // 素材库
 export { getMediaAssets, getMediaAsset } from "./mediaAssets"

apps/web/src/api/template-editor/types.ts

@@ -9,8 +9,8 @@ import type {
   FilterConfig,
   ChromaKeyConfig,
   StickerConfig,
-  CoverConfig,
 } from "@/pages/editing-planner/types"
+import type { CoverConfig } from "@/pages/generate/types/cover"
 
 /* ── 模板草稿状态 ── */
 
@@ -118,6 +118,10 @@ export interface EditPlanConfig {
   generate_count?: number
   /** 素材模式 */
   material_mode?: string
+  /** 预览视频 URL（封面生成用） */
+  rendered_storage_key?: string
+  /** 生成任务 ID */
+  generation_task_id?: string
 }
 
 /* ── 模板草稿主体 ── */
@@ -240,7 +244,7 @@ export interface GeneratedVideo {
   updated_at?: string
 }
 
-/* ── AI 推荐 & 封面生成 ── */
+/* ── AI 推荐 ── */
 
 /** AI 推荐请求 */
 export interface AIRecommendRequest {
@@ -270,28 +274,6 @@ export interface AIRecommendResponse {
   confidence: number
 }
 
-/** AI 封面生成请求 */
-export interface GenerateCoverRequest {
-  asset_ids: string[]
-  cover_type?: "ai_frame" | "manual" | "upload" | "ai_regenerate"
-  frame_time?: number
-}
-
-/** AI 封面生成响应 */
-export interface GenerateCoverResponse {
-  plan_id: string
-  cover: CoverResult
-}
-
-/** 封面生成结果 */
-export interface CoverResult {
-  scheme?: string
-  asset_id?: string
-  frame_time?: number
-  image_url?: string
-  thumbnail_url?: string
-}
-
 /* ── 片段 CRUD 相关 ── */
 
 /** 片段状态 */

apps/web/src/pages/editing-planner/EditingPlanner.tsx

@@ -74,8 +74,6 @@ const EditingPlanner: React.FC = () => {
     setChromaKeySettings,
     stickerSettings,
     setStickerSettings,
-    coverConfig,
-    setCoverConfig,
   } = useGlobalSettings()
 
   /* ── 右侧栏 Tab ── */
@@ -119,7 +117,6 @@ const EditingPlanner: React.FC = () => {
     setTitleConfig,
     setSubtitleSettings,
     setBgmSettings,
-    setCoverConfig,
     clips,
     totalDuration,
     titleConfig,
@@ -131,7 +128,6 @@ const EditingPlanner: React.FC = () => {
     filterSettings,
     chromaKeySettings,
     stickerSettings,
-    coverConfig,
   })
 
   /* ──────────── 渲染 ──────────── */
@@ -181,7 +177,6 @@ const EditingPlanner: React.FC = () => {
             selectedClipId={clipOps.selectedClipId}
             isPlaying={playback.isPlaying}
             titleConfig={titleConfig}
-            coverConfig={coverConfig}
             subtitleSettings={{
               enabled: subtitleSettings.enabled,
               position: subtitleSettings.position,
@@ -243,7 +238,6 @@ const EditingPlanner: React.FC = () => {
           onOpenFilterDrawer={() => drawers.setFilterDrawerOpen(true)}
           onOpenGreenScreenDrawer={() => drawers.setChromaKeyDrawerOpen(true)}
           onOpenStickerDrawer={() => drawers.setStickerDrawerOpen(true)}
-          onOpenCoverDrawer={() => drawers.setCoverDrawerOpen(true)}
           clips={clips}
           selectedClipId={clipOps.selectedClipId}
           onClipSelect={clipOps.handleClipSelect}
@@ -336,12 +330,6 @@ const EditingPlanner: React.FC = () => {
         stickerSettings={stickerSettings}
         onStickerChange={setStickerSettings}
         onCloseStickerDrawer={() => drawers.setStickerDrawerOpen(false)}
-        coverDrawerOpen={drawers.coverDrawerOpen}
-        onCloseCoverDrawer={() => drawers.setCoverDrawerOpen(false)}
-        coverConfig={coverConfig}
-        setCoverConfig={setCoverConfig}
-        templateId={urlTemplateId}
-        totalDuration={totalDuration}
       />
     </div>
   )

apps/web/src/pages/editing-planner/components/ClipPropertiesPanel.tsx

@@ -35,7 +35,6 @@ const ClipPropertiesPanel: React.FC<ClipPropertiesPanelProps> = ({
   onOpenFilterDrawer,
   onOpenGreenScreenDrawer,
   onOpenStickerDrawer,
-  onOpenCoverDrawer,
 }) => {
   const { previewingId, handlePreviewVoice, stopPreview } = useVoicePreview()
 
@@ -141,21 +140,6 @@ const ClipPropertiesPanel: React.FC<ClipPropertiesPanelProps> = ({
         )}
       </div>
 
-      {/* ═══ 封面设置 ═══ */}
-      <div className="ep-settings-section">
-        <div className="ep-section-title">
-          <span className="ep-section-icon">🖼️</span>
-          封面设置
-        </div>
-        {onOpenCoverDrawer && (
-          <button className="ep-advanced-btn" onClick={onOpenCoverDrawer}>
-            <span className="ep-advanced-btn-icon">🖼️</span>
-            <span className="ep-advanced-btn-label">配置视频封面</span>
-            <span className="ep-advanced-btn-arrow">›</span>
-          </button>
-        )}
-      </div>
-
       {/* ═══ 片段详情（选中时显示） ═══ */}
       {selectedClip && (
         <ClipDetailSection

apps/web/src/pages/editing-planner/components/CoverSelector.tsx

@@ -1,5 +0,0 @@
-/**
- * 封面选择器入口（向后兼容）
- * 实际实现位于 ./cover-selector/ 目录
- */
-export { default } from "./cover-selector"

apps/web/src/pages/editing-planner/components/EditorDrawers.tsx

@@ -10,7 +10,6 @@ import PipConfigPanel from "./PipConfigPanel"
 import FilterPanel from "./FilterPanel"
 import GreenScreenPanel from "./GreenScreenPanel"
 import StickerPanel from "./StickerPanel"
-import CoverSelector from "./CoverSelector"
 import type {
   ClipData,
   TransitionConfig,
@@ -24,7 +23,6 @@ import type {
   StickerConfig,
 } from "../types"
 import type { SubtitleStyleConfig } from "../types/subtitle"
-import type { CoverConfig } from "../types/cover"
 import type { BgmMixConfig } from "@/api/bgm"
 import { DEFAULT_TRANSITION, DEFAULT_SPEED, DEFAULT_TTS_CONFIG } from "../types"
 
@@ -87,13 +85,6 @@ interface EditorDrawersProps {
   stickerSettings: StickerConfig
   onStickerChange: (config: StickerConfig) => void
   onCloseStickerDrawer: () => void
-  // 封面
-  coverDrawerOpen: boolean
-  onCloseCoverDrawer: () => void
-  coverConfig: CoverConfig
-  setCoverConfig: (config: CoverConfig | ((prev: CoverConfig) => CoverConfig)) => void
-  templateId: string
-  totalDuration: number
 }
 
 const EditorDrawers: React.FC<EditorDrawersProps> = ({
@@ -144,11 +135,6 @@ const EditorDrawers: React.FC<EditorDrawersProps> = ({
   stickerSettings,
   onStickerChange,
   onCloseStickerDrawer,
-  coverDrawerOpen,
-  onCloseCoverDrawer,
-  coverConfig,
-  setCoverConfig,
-  templateId,
 }) => {
   const transitionConfig = transitionTargetClipId
     ? (clips.find((c) => c.id === transitionTargetClipId)?.transition ?? DEFAULT_TRANSITION)
@@ -253,16 +239,6 @@ const EditorDrawers: React.FC<EditorDrawersProps> = ({
         onChange={onStickerChange}
         totalDuration={totalDuration}
       />
-
-      {/* 封面选择器 Drawer */}
-      <CoverSelector
-        open={coverDrawerOpen}
-        onClose={onCloseCoverDrawer}
-        config={coverConfig}
-        onChange={setCoverConfig}
-        totalDuration={totalDuration}
-        templateId={templateId}
-      />
     </>
   )
 }

apps/web/src/pages/editing-planner/components/PreviewPlayer.tsx

@@ -1,12 +1,10 @@
 /**
  * 预览区 — V8 原型 1:1 还原
- * 手机模型预览 + 封面预览 并排
- * 封面为只读展示（从模板/计划继承）
+ * 手机模型预览
  */
 import React from "react"
 import type { ClipData, ClipType } from "../types"
 import type { TitleConfig } from "@/api/template-editor"
-import type { CoverConfig } from "../types"
 
 interface SubtitleSettings {
   enabled: boolean
@@ -21,7 +19,6 @@ interface PreviewPlayerProps {
   selectedClipId: string | null
   isPlaying: boolean
   titleConfig?: TitleConfig
-  coverConfig?: CoverConfig
   subtitleSettings?: SubtitleSettings
   onClipSelect: (clipId: string) => void
   onPlayPause: () => void
@@ -37,18 +34,11 @@ const CLIP_TYPE_LABELS: Record<ClipType, string> = {
   pip: "混剪",
 }
 
-const COVER_MODE_LABELS: Record<string, string> = {
-  auto: "智能封面",
-  frame: "抽帧封面",
-  upload: "上传封面",
-}
-
 const PreviewPlayer: React.FC<PreviewPlayerProps> = ({
   clips,
   selectedClipId,
   isPlaying,
   titleConfig,
-  coverConfig,
   subtitleSettings,
   onPlayPause,
 }) => {
@@ -132,26 +122,6 @@ const PreviewPlayer: React.FC<PreviewPlayerProps> = ({
           )}
         </div>
       </div>
-
-      {/* 封面预览（只读） */}
-      <div className="ep-cover-preview">
-        <div className="ep-cover-image">
-          {coverConfig?.thumbnail_url || coverConfig?.upload_url ? (
-            <img
-              src={coverConfig.thumbnail_url || coverConfig.upload_url}
-              alt="封面预览"
-              className="ep-cover-img"
-            />
-          ) : displayClip ? (
-            <span className="ep-cover-icon">{CLIP_TYPE_ICONS[displayClip.type] || "🎬"}</span>
-          ) : (
-            <span>暂无封面</span>
-          )}
-        </div>
-        <div className="ep-cover-label">
-          {coverConfig?.enabled ? COVER_MODE_LABELS[coverConfig.mode] || "封面预览" : "未启用封面"}
-        </div>
-      </div>
     </div>
   )
 }

apps/web/src/pages/editing-planner/components/RightPanel.tsx

@@ -35,7 +35,6 @@ interface RightPanelProps {
   onOpenFilterDrawer: () => void
   onOpenGreenScreenDrawer: () => void
   onOpenStickerDrawer: () => void
-  onOpenCoverDrawer: () => void
   // 片段 tab
   clips: ClipData[]
   selectedClipId: string | null
@@ -73,7 +72,6 @@ const RightPanel: React.FC<RightPanelProps> = ({
   onOpenFilterDrawer,
   onOpenGreenScreenDrawer,
   onOpenStickerDrawer,
-  onOpenCoverDrawer,
   clips,
   selectedClipId,
   onClipSelect,
@@ -144,7 +142,6 @@ const RightPanel: React.FC<RightPanelProps> = ({
                 onOpenFilterDrawer={onOpenFilterDrawer}
                 onOpenGreenScreenDrawer={onOpenGreenScreenDrawer}
                 onOpenStickerDrawer={onOpenStickerDrawer}
-                onOpenCoverDrawer={onOpenCoverDrawer}
               />
             )
           })()}

apps/web/src/pages/editing-planner/components/cover-selector/CoverModePanels.tsx

@@ -1,143 +0,0 @@
-import React from "react"
-import type { CoverConfig } from "../../types"
-
-interface CoverAutoModeProps {
-  config: CoverConfig
-  formatTime: (s: number) => string
-  onUseAiSuggestion: () => void
-}
-
-/** 智能封面模式面板 */
-export const CoverAutoMode: React.FC<CoverAutoModeProps> = ({
-  config,
-  formatTime,
-  onUseAiSuggestion,
-}) => (
-  <div className="cover-auto-section">
-    <div className="cover-auto-desc">AI 将分析视频内容，自动选择最具吸引力的画面作为封面。</div>
-    {config.ai_suggested_time !== null ? (
-      <div className="cover-auto-suggestion">
-        <div className="cover-auto-badge">AI 推荐</div>
-        <div className="cover-auto-time">推荐时间点：{formatTime(config.ai_suggested_time)}</div>
-        <button className="cover-auto-use-btn" onClick={onUseAiSuggestion}>
-          使用此时间点
-        </button>
-      </div>
-    ) : (
-      <div className="cover-auto-pending">
-        <div className="cover-auto-spinner" />
-        <span>AI 分析中...（生成视频后自动推荐）</span>
-      </div>
-    )}
-  </div>
-)
-
-interface CoverFrameModeProps {
-  config: CoverConfig
-  totalDuration: number
-  formatTime: (s: number) => string
-  onFrameTimeChange: (time: number) => void
-}
-
-/** 抽帧选封面模式面板 */
-export const CoverFrameMode: React.FC<CoverFrameModeProps> = ({
-  config,
-  totalDuration,
-  formatTime,
-  onFrameTimeChange,
-}) => (
-  <div className="cover-frame-section">
-    <div className="cover-frame-preview">
-      <div className="cover-frame-placeholder">
-        <span className="cover-frame-icon">🎞️</span>
-        <span className="cover-frame-time">{formatTime(config.frame_time)}</span>
-      </div>
-    </div>
-    <div className="cover-frame-timeline">
-      <div className="cover-frame-slider-header">
-        <span className="cover-frame-slider-label">拖动选择封面帧</span>
-        <span className="cover-frame-slider-value">{formatTime(config.frame_time)}</span>
-      </div>
-      <input
-        type="range"
-        className="cover-frame-slider"
-        min={0}
-        max={Math.max(totalDuration, 1)}
-        step={0.1}
-        value={config.frame_time}
-        onChange={(e) => onFrameTimeChange(Number(e.target.value))}
-      />
-      <div className="cover-frame-range">
-        <span>00:00</span>
-        <span>{formatTime(totalDuration)}</span>
-      </div>
-    </div>
-    <div className="cover-frame-quick">
-      <span className="cover-quick-label">快捷选帧：</span>
-      {[0, 0.25, 0.5, 0.75].map((ratio) => {
-        const t = totalDuration * ratio
-        return (
-          <button key={ratio} className="cover-quick-btn" onClick={() => onFrameTimeChange(t)}>
-            {formatTime(t)}
-          </button>
-        )
-      })}
-    </div>
-  </div>
-)
-
-interface CoverUploadModeProps {
-  config: CoverConfig
-  isDragging: boolean
-  fileInputRef: React.RefObject<HTMLInputElement>
-  onDragOver: (e: React.DragEvent) => void
-  onDragLeave: () => void
-  onDrop: (e: React.DragEvent) => void
-  onAreaClick: () => void
-  onFileChange: (file: File) => void
-}
-
-/** 上传封面模式面板 */
-export const CoverUploadMode: React.FC<CoverUploadModeProps> = ({
-  config,
-  isDragging,
-  fileInputRef,
-  onDragOver,
-  onDragLeave,
-  onDrop,
-  onAreaClick,
-  onFileChange,
-}) => (
-  <div className="cover-upload-section">
-    <div
-      className={`cover-upload-area${isDragging ? " dragging" : ""}`}
-      onDragOver={onDragOver}
-      onDragLeave={onDragLeave}
-      onDrop={onDrop}
-      onClick={onAreaClick}
-    >
-      {config.upload_url ? (
-        <div className="cover-upload-preview">
-          <img src={config.upload_url} alt="封面预览" />
-          <div className="cover-upload-overlay">点击更换</div>
-        </div>
-      ) : (
-        <div className="cover-upload-placeholder">
-          <span className="cover-upload-icon">📤</span>
-          <span className="cover-upload-text">点击或拖拽上传封面图片</span>
-          <span className="cover-upload-hint">支持 JPG / PNG，建议 16:9 比例</span>
-        </div>
-      )}
-      <input
-        ref={fileInputRef}
-        type="file"
-        accept="image/*"
-        style={{ display: "none" }}
-        onChange={(e) => {
-          const file = e.target.files?.[0]
-          if (file) onFileChange(file)
-        }}
-      />
-    </div>
-  </div>
-)

apps/web/src/pages/editing-planner/components/cover-selector/index.tsx

@@ -1,195 +0,0 @@
-/**
- * 封面选择器
- * 抽帧选封面 + 上传自定义封面 + 智能封面推荐
- */
-import React, { useState } from "react"
-import { Drawer, Modal, Spin, message } from "antd"
-import { generateCover } from "@/api/template-editor/aiFeatures"
-import type { CoverConfig, CoverMode } from "../../types"
-import { useCoverSelector, MODE_LABELS, MODE_ICONS } from "./useCoverSelector"
-import { CoverAutoMode, CoverFrameMode, CoverUploadMode } from "./CoverModePanels"
-
-interface CoverSelectorProps {
-  open: boolean
-  onClose: () => void
-  config: CoverConfig
-  onChange: (config: CoverConfig) => void
-  totalDuration: number
-  templateId: string
-}
-
-const CoverSelector: React.FC<CoverSelectorProps> = ({
-  open,
-  onClose,
-  config,
-  onChange,
-  totalDuration,
-  templateId,
-}) => {
-  const {
-    fileInputRef,
-    isDragging,
-    setIsDragging,
-    update,
-    handleReset,
-    handleModeChange,
-    handleFileUpload,
-    handleDrop,
-    handleUseAiSuggestion,
-    formatTime,
-  } = useCoverSelector({ config, onChange })
-
-  const [generating, setGenerating] = useState(false)
-
-  const handleGenerateCover = async () => {
-    if (!templateId) {
-      message.error("请先保存模板")
-      return
-    }
-    setGenerating(true)
-    try {
-      const res = await generateCover(templateId, {
-        asset_ids: [],
-        cover_type: "ai_frame",
-      })
-      const imageUrl = res.cover?.image_url || res.cover?.thumbnail_url || ""
-      if (imageUrl) {
-        update({ upload_url: imageUrl, thumbnail_url: imageUrl })
-      }
-      message.success("封面生成成功")
-    } catch (err: any) {
-      message.error("封面生成失败: " + (err?.message || "未知错误"))
-    } finally {
-      setGenerating(false)
-    }
-  }
-
-  return (
-    <Drawer
-      title="封面选择"
-      placement="right"
-      width={440}
-      open={open}
-      onClose={onClose}
-      className="cover-selector-drawer"
-    >
-      {/* 顶部开关 */}
-      <div className="cover-header">
-        <span className="cover-header-label">启用自定义封面</span>
-        <label className="cover-switch">
-          <input
-            type="checkbox"
-            checked={config.enabled}
-            onChange={(e) => update({ enabled: e.target.checked })}
-          />
-          <span className="cover-switch-slider" />
-        </label>
-      </div>
-
-      {/* 模式选择 */}
-      <div className="cover-mode-section">
-        <div className="cover-section-title">封面来源</div>
-        <div className="cover-mode-tabs">
-          {(["auto", "frame", "upload"] as CoverMode[]).map((m) => (
-            <button
-              key={m}
-              className={`cover-mode-tab${config.mode === m ? " active" : ""}`}
-              onClick={() => handleModeChange(m)}
-            >
-              <span className="cover-mode-icon">{MODE_ICONS[m]}</span>
-              <span className="cover-mode-label">{MODE_LABELS[m]}</span>
-            </button>
-          ))}
-        </div>
-      </div>
-
-      {/* 模式内容区 */}
-      <div className="cover-mode-content">
-        {config.mode === "auto" && (
-          <CoverAutoMode
-            config={config}
-            formatTime={formatTime}
-            onUseAiSuggestion={handleUseAiSuggestion}
-          />
-        )}
-
-        {config.mode === "frame" && (
-          <CoverFrameMode
-            config={config}
-            totalDuration={totalDuration}
-            formatTime={formatTime}
-            onFrameTimeChange={(t) => update({ frame_time: t })}
-          />
-        )}
-
-        {config.mode === "upload" && (
-          <CoverUploadMode
-            config={config}
-            isDragging={isDragging}
-            fileInputRef={fileInputRef}
-            onDragOver={(e) => {
-              e.preventDefault()
-              setIsDragging(true)
-            }}
-            onDragLeave={() => setIsDragging(false)}
-            onDrop={handleDrop}
-            onAreaClick={() => fileInputRef.current?.click()}
-            onFileChange={handleFileUpload}
-          />
-        )}
-      </div>
-
-      {/* 封面预览 */}
-      <div className="cover-preview-section">
-        <div className="cover-section-title">封面预览</div>
-        <div className="cover-preview-box">
-          {config.upload_url ? (
-            <img src={config.upload_url} alt="封面预览" className="cover-preview-img" />
-          ) : (
-            <div className="cover-preview-placeholder">
-              <span className="cover-preview-icon">🖼️</span>
-              <span className="cover-preview-text">
-                {config.mode === "auto"
-                  ? "AI 智能选择"
-                  : config.mode === "frame"
-                    ? `帧 ${formatTime(config.frame_time)}`
-                    : "未上传封面"}
-              </span>
-            </div>
-          )}
-          <div className="cover-preview-ratio">16:9</div>
-        </div>
-      </div>
-
-      {/* AI 生成封面按钮 */}
-      {config.enabled && config.mode === "auto" && (
-        <div className="cover-generate-section">
-          <button
-            className="cover-generate-btn"
-            onClick={handleGenerateCover}
-            disabled={generating}
-          >
-            {generating ? "生成中..." : "🤖 AI 生成封面"}
-          </button>
-        </div>
-      )}
-
-      {/* 底部 */}
-      <div className="cover-footer">
-        <button className="cover-reset-btn" onClick={handleReset}>
-          重置封面
-        </button>
-      </div>
-
-      {/* 生成进度弹窗 */}
-      <Modal open={generating} closable={false} footer={null} centered>
-        <div style={{ textAlign: "center", padding: "24px 0" }}>
-          <Spin size="large" />
-          <p style={{ marginTop: 16, fontSize: 14, color: "#666" }}>AI 正在生成封面，请稍候...</p>
-        </div>
-      </Modal>
-    </Drawer>
-  )
-}
-
-export default CoverSelector

apps/web/src/pages/editing-planner/components/cover-selector/useCoverSelector.ts

@@ -1,98 +0,0 @@
-import { useCallback, useRef, useState } from "react"
-import type { CoverConfig, CoverMode } from "../../types"
-import { DEFAULT_COVER_CONFIG } from "../../types"
-
-/** 封面模式标签 */
-export const MODE_LABELS: Record<CoverMode, string> = {
-  auto: "智能封面",
-  frame: "抽帧选封面",
-  upload: "上传封面",
-}
-
-/** 封面模式图标 */
-export const MODE_ICONS: Record<CoverMode, string> = {
-  auto: "🤖",
-  frame: "🎞️",
-  upload: "📤",
-}
-
-interface UseCoverSelectorOptions {
-  config: CoverConfig
-  onChange: (config: CoverConfig) => void
-}
-
-/**
- * 封面选择器 Hook
- * 封装状态管理、文件上传、模式切换等逻辑
- */
-export function useCoverSelector({ config, onChange }: UseCoverSelectorOptions) {
-  const fileInputRef = useRef<HTMLInputElement>(null)
-  const [isDragging, setIsDragging] = useState(false)
-
-  const update = useCallback(
-    (partial: Partial<CoverConfig>) => {
-      onChange({ ...config, ...partial })
-    },
-    [config, onChange],
-  )
-
-  const handleReset = useCallback(() => {
-    onChange({ ...DEFAULT_COVER_CONFIG, enabled: config.enabled })
-  }, [config.enabled, onChange])
-
-  const handleModeChange = useCallback(
-    (mode: CoverMode) => {
-      update({ mode })
-    },
-    [update],
-  )
-
-  const handleFileUpload = useCallback(
-    (file: File) => {
-      if (!file.type.startsWith("image/")) return
-      const reader = new FileReader()
-      reader.onload = (e) => {
-        const url = e.target?.result as string
-        update({ upload_url: url, thumbnail_url: url, mode: "upload" })
-      }
-      reader.readAsDataURL(file)
-    },
-    [update],
-  )
-
-  const handleDrop = useCallback(
-    (e: React.DragEvent) => {
-      e.preventDefault()
-      setIsDragging(false)
-      const file = e.dataTransfer.files[0]
-      if (file) handleFileUpload(file)
-    },
-    [handleFileUpload],
-  )
-
-  const handleUseAiSuggestion = useCallback(() => {
-    if (config.ai_suggested_time !== null) {
-      update({ frame_time: config.ai_suggested_time, mode: "frame" })
-    }
-  }, [config.ai_suggested_time, update])
-
-  const formatTime = (seconds: number) => {
-    const m = Math.floor(seconds / 60)
-    const s = Math.floor(seconds % 60)
-    const ms = Math.floor((seconds % 1) * 10)
-    return `${m.toString().padStart(2, "0")}:${s.toString().padStart(2, "0")}.${ms}`
-  }
-
-  return {
-    fileInputRef,
-    isDragging,
-    setIsDragging,
-    update,
-    handleReset,
-    handleModeChange,
-    handleFileUpload,
-    handleDrop,
-    handleUseAiSuggestion,
-    formatTime,
-  }
-}

apps/web/src/pages/editing-planner/hooks/template-management/usePlanLoading.ts

@@ -6,7 +6,6 @@ import type { SubtitleStyleConfig } from "../../types/subtitle"
 import type { TitleConfig } from "@/api/template-editor"
 import type { BgmMixConfig } from "@/api/bgm"
 import type { TransitionEffect } from "@/api/template-editor"
-import type { CoverConfig } from "../../types"
 
 interface UsePlanLoadingOptions {
   loadedPlanId: string | null
@@ -16,7 +15,6 @@ interface UsePlanLoadingOptions {
   setTitleConfig: Dispatch<SetStateAction<TitleConfig>>
   setSubtitleSettings: Dispatch<SetStateAction<SubtitleStyleConfig>>
   setBgmSettings: Dispatch<SetStateAction<BgmMixConfig>>
-  setCoverConfig: Dispatch<SetStateAction<CoverConfig>>
 }
 
 /**
@@ -31,7 +29,6 @@ export function usePlanLoading({
   setTitleConfig,
   setSubtitleSettings,
   setBgmSettings,
-  setCoverConfig,
 }: UsePlanLoadingOptions) {
   useEffect(() => {
     if (!loadedPlanId) return
@@ -77,17 +74,6 @@ export function usePlanLoading({
             music_id: cfg.bgm_config!.music_id || "",
           }))
         }
-        if (cfg.cover_config) {
-          setCoverConfig((prev: CoverConfig) => ({
-            ...prev,
-            enabled: cfg.cover_config!.enabled ?? prev.enabled,
-            mode: (cfg.cover_config!.mode as CoverConfig["mode"]) || prev.mode,
-            frame_time: cfg.cover_config!.frame_time ?? prev.frame_time,
-            upload_url: cfg.cover_config!.upload_url || prev.upload_url,
-            thumbnail_url: cfg.cover_config!.thumbnail_url || prev.thumbnail_url,
-            ai_suggested_time: cfg.cover_config!.ai_suggested_time ?? prev.ai_suggested_time,
-          }))
-        }
 
         /* 还原片段：优先从后端 clips 表，其次从 config.segments 兜底 */
         const backendClips = clipsRes?.items || []
@@ -152,6 +138,5 @@ export function usePlanLoading({
     setTitleConfig,
     setSubtitleSettings,
     setBgmSettings,
-    setCoverConfig,
   ])
 }

apps/web/src/pages/editing-planner/hooks/template-management/useTemplateSave.ts

@@ -17,7 +17,6 @@ import type {
 } from "../../types"
 import type { SubtitleStyleConfig } from "../../types/subtitle"
 import type { TitleConfig } from "@/api/template-editor"
-import type { CoverConfig } from "../../types"
 import type { BgmMixConfig } from "@/api/bgm"
 
 interface UseTemplateSaveOptions {
@@ -33,7 +32,6 @@ interface UseTemplateSaveOptions {
   filterSettings: FilterConfig
   chromaKeySettings: ChromaKeyConfig
   stickerSettings: StickerConfig
-  coverConfig: CoverConfig
   loadedTemplateId: string | null
   loadTemplates: () => Promise<void>
 }
@@ -55,7 +53,6 @@ export function useTemplateSave(options: UseTemplateSaveOptions) {
     filterSettings,
     chromaKeySettings,
     stickerSettings,
-    coverConfig,
     loadedTemplateId,
     loadTemplates,
   } = options
@@ -132,7 +129,6 @@ export function useTemplateSave(options: UseTemplateSaveOptions) {
         filter_config: { ...filterSettings },
         green_screen_config: { ...chromaKeySettings },
         sticker_config: { ...stickerSettings },
-        cover_config: { ...coverConfig },
       }
       if (loadedTemplateId) {
         await updateEditingTemplate(loadedTemplateId, payload)
@@ -163,7 +159,6 @@ export function useTemplateSave(options: UseTemplateSaveOptions) {
     filterSettings,
     chromaKeySettings,
     stickerSettings,
-    coverConfig,
     loadedTemplateId,
     loadTemplates,
   ])

apps/web/src/pages/editing-planner/hooks/useEditorDrawers.ts

@@ -17,7 +17,6 @@ export const useEditorDrawers = () => {
   const [filterDrawerOpen, setFilterDrawerOpen] = useState(false)
   const [chromaKeyDrawerOpen, setChromaKeyDrawerOpen] = useState(false)
   const [stickerDrawerOpen, setStickerDrawerOpen] = useState(false)
-  const [coverDrawerOpen, setCoverDrawerOpen] = useState(false)
 
   /* ── 目标片段 ID ── */
   /** 当前正在编辑转场的片段 ID（null = 全局默认转场） */
@@ -67,8 +66,6 @@ export const useEditorDrawers = () => {
     setChromaKeyDrawerOpen,
     stickerDrawerOpen,
     setStickerDrawerOpen,
-    coverDrawerOpen,
-    setCoverDrawerOpen,
     // 目标 ID
     transitionTargetClipId,
     speedTargetClipId,

apps/web/src/pages/editing-planner/hooks/useGlobalSettings.ts

@@ -11,7 +11,6 @@ import type {
   FilterConfig,
   ChromaKeyConfig,
   StickerConfig,
-  CoverConfig,
 } from "../types"
 import {
   DEFAULT_WATERMARK,
@@ -20,7 +19,6 @@ import {
   DEFAULT_FILTER_CONFIG,
   DEFAULT_CHROMA_KEY_CONFIG,
   DEFAULT_STICKER_CONFIG,
-  DEFAULT_COVER_CONFIG,
 } from "../types"
 import type { SubtitleStyleConfig } from "../types/subtitle"
 import { DEFAULT_SUBTITLE_STYLE } from "../types/subtitle"
@@ -47,8 +45,6 @@ export interface GlobalSettings {
   setChromaKeySettings: (config: ChromaKeyConfig) => void
   stickerSettings: StickerConfig
   setStickerSettings: (config: StickerConfig) => void
-  coverConfig: CoverConfig
-  setCoverConfig: (config: CoverConfig | ((prev: CoverConfig) => CoverConfig)) => void
 }
 
 export const useGlobalSettings = (): GlobalSettings => {
@@ -92,10 +88,6 @@ export const useGlobalSettings = (): GlobalSettings => {
     ...DEFAULT_STICKER_CONFIG,
   })
 
-  const [coverConfig, setCoverConfig] = useState<CoverConfig>({
-    ...DEFAULT_COVER_CONFIG,
-  })
-
   return {
     titleConfig,
     setTitleConfig,
@@ -115,7 +107,5 @@ export const useGlobalSettings = (): GlobalSettings => {
     setChromaKeySettings,
     stickerSettings,
     setStickerSettings,
-    coverConfig,
-    setCoverConfig,
   }
 }

apps/web/src/pages/editing-planner/hooks/useTemplateManagement.ts

@@ -9,7 +9,6 @@ import type {
   FilterConfig,
   ChromaKeyConfig,
   StickerConfig,
-  CoverConfig,
 } from "../types"
 import type { SubtitleStyleConfig } from "../types/subtitle"
 import type { BgmMixConfig } from "@/api/bgm"
@@ -29,7 +28,6 @@ interface UseTemplateManagementParams {
   setTitleConfig: Dispatch<SetStateAction<TitleConfig>>
   setSubtitleSettings: Dispatch<SetStateAction<SubtitleStyleConfig>>
   setBgmSettings: Dispatch<SetStateAction<BgmMixConfig>>
-  setCoverConfig: Dispatch<SetStateAction<CoverConfig>>
   clips: ClipData[]
   totalDuration: number
   titleConfig: TitleConfig
@@ -41,7 +39,6 @@ interface UseTemplateManagementParams {
   filterSettings: FilterConfig
   chromaKeySettings: ChromaKeyConfig
   stickerSettings: StickerConfig
-  coverConfig: CoverConfig
 }
 
 /**
@@ -59,7 +56,6 @@ export const useTemplateManagement = (params: UseTemplateManagementParams) => {
     setTitleConfig,
     setSubtitleSettings,
     setBgmSettings,
-    setCoverConfig,
     clips,
     totalDuration,
     titleConfig,
@@ -71,7 +67,6 @@ export const useTemplateManagement = (params: UseTemplateManagementParams) => {
     filterSettings,
     chromaKeySettings,
     stickerSettings,
-    coverConfig,
   } = params
 
   const [currentMode, setCurrentMode] = useState<TemplateMode>("pip")
@@ -119,7 +114,6 @@ export const useTemplateManagement = (params: UseTemplateManagementParams) => {
     filterSettings,
     chromaKeySettings,
     stickerSettings,
-    coverConfig,
     loadedTemplateId,
     loadTemplates,
   })
@@ -146,7 +140,6 @@ export const useTemplateManagement = (params: UseTemplateManagementParams) => {
     setTitleConfig,
     setSubtitleSettings,
     setBgmSettings,
-    setCoverConfig,
   })
 
   /* ── 事件 ── */

apps/web/src/pages/editing-planner/types/clipProperties.ts

@@ -67,6 +67,4 @@ export interface ClipPropertiesPanelProps {
   onOpenGreenScreenDrawer?: () => void
   /** 打开贴纸面板 Drawer */
   onOpenStickerDrawer?: () => void
-  /** 打开封面选择器 Drawer */
-  onOpenCoverDrawer?: () => void
 }

apps/web/src/pages/editing-planner/types/index.ts

@@ -71,9 +71,6 @@ export {
   TEXT_STICKER_PRESET_LABELS,
 } from "./sticker"
 
-/* 封面 */
-export { type CoverMode, type CoverConfig, DEFAULT_COVER_CONFIG, type CoverTemplate } from "./cover"
-
 /* 片段数据 */
 export { type ClipType, type ClipData } from "./clip"
 

apps/web/src/pages/generate/GeneratePage.tsx

@@ -1,6 +1,6 @@
 /**
  * 智能剪辑页面 — V22 多预览 + 配音前置
- * 7 步向导：选择模板 → 选择素材 → 选择配音 → 生成预览 → 选择标题 → 选择封面 → 确认生成
+ * 7 步向导：选择模板 → 选择素材 → 选择配音 → 选择标题 → 生成预览 → 选择封面 → 确认生成
  * 左右布局：左侧 generate-form + 右侧 generate-preview
  * 主组件仅保留整体布局与事件编排
  * 状态管理 → hooks/useGenerateFormState
@@ -12,7 +12,10 @@
 import React, { useState, useMemo } from "react"
 import { Modal, message } from "antd"
 import { useNavigate } from "react-router-dom"
+import { useQuery } from "@tanstack/react-query"
 import type { VoiceClone } from "@/api/voice-clone"
+import { getAssetsByKind } from "@/api/assets/assets"
+import type { AssetItem } from "@/api/assets/types"
 import { useCloneProgress } from "@/hooks/useCloneProgress"
 import CloneModal from "@/components/voice/CloneModal"
 import GenerateHeader from "./components/GenerateHeader"
@@ -24,7 +27,7 @@ import GenerateStepActions from "./components/GenerateStepActions"
 import { useGenerateFormState } from "./hooks/useGenerateFormState"
 import { useStepNavigation } from "./hooks/useStepNavigation"
 import { useGenerateVideo } from "./hooks/useGenerateVideo"
-import { useStep4Preview } from "./hooks/useStep4Preview"
+import { useStep5Preview } from "./hooks/useStep5Preview"
 import "./generate.css"
 
 const GeneratePage: React.FC = () => {
@@ -71,6 +74,20 @@ const GeneratePage: React.FC = () => {
     setPreviewModalOpen,
   } = formState
 
+  /* ── 查询视频素材，用于 Step4 标题预览背景 ── */
+  const { data: videoAssets = [] } = useQuery({
+    queryKey: ["generate-video-assets"],
+    queryFn: () => getAssetsByKind("video", { limit: 50 }),
+  })
+
+  // 获取第一个选中素材的 URL
+  const sourceVideoUrl = useMemo(() => {
+    const firstId = selectedMaterials[0]
+    if (!firstId) return undefined
+    const asset = videoAssets.find((a: AssetItem) => a.id === firstId)
+    return asset?.file_url
+  }, [selectedMaterials, videoAssets])
+
   /* ── 克隆声音 ── */
   const { clones: clonedVoices, addClone, hasProcessing } = useCloneProgress()
 
@@ -96,8 +113,8 @@ const GeneratePage: React.FC = () => {
     return id ? [id] : []
   }, [voiceMode, selectedVoice, selectedClonedVoice])
 
-  /* ── Step4 预览生成（多预览 + voice_ids） ── */
-  const step4Preview = useStep4Preview({
+  /* ── Step5 预览生成（多预览 + voice_ids） ── */
+  const step5Preview = useStep5Preview({
     templates: userTemplates,
     selectedTemplate,
     materialMode,
@@ -108,6 +125,7 @@ const GeneratePage: React.FC = () => {
     voiceIds: previewVoiceIds,
     voiceLibraryId: selectedVoice || undefined,
     previewCount,
+    titleSettings,
   })
 
   /* ── 步骤导航 ── */
@@ -119,7 +137,7 @@ const GeneratePage: React.FC = () => {
     selectedMaterials,
     smartSelectedIds,
     titleSettings,
-    previewReady: step4Preview.canProceed,
+    previewReady: step5Preview.canProceed,
   })
 
   /* ── 视频生成核心逻辑 ── */
@@ -150,7 +168,7 @@ const GeneratePage: React.FC = () => {
     autoSubtitles,
     bgm,
     generateCount,
-    previewTaskId: step4Preview.selectedTaskId,
+    previewTaskId: step5Preview.selectedTaskId,
   })
 
   /* ================================================================
@@ -207,20 +225,20 @@ const GeneratePage: React.FC = () => {
             onDismissError={handleDismissError}
             presetVoices={presetVoices}
             videoRatio={videoRatio}
-            /* Step4 多预览 */
+            /* Step5 多预览 */
             previewCount={previewCount}
             onPreviewCountChange={setPreviewCount}
-            previewItems={step4Preview.items}
-            previewSelectedIndex={step4Preview.selectedIndex}
-            onSelectPreview={step4Preview.setSelectedIndex}
-            previewOverallStatus={step4Preview.previewStatus}
-            previewOverallError={step4Preview.previewError}
-            previewOverallProgress={step4Preview.progress}
-            previewAnyGenerating={step4Preview.anyGenerating}
-            previewTemplateName={step4Preview.templateName}
-            previewMaterialCount={step4Preview.materialCount}
-            onGeneratePreview={step4Preview.generatePreview}
-            onRegeneratePreview={step4Preview.regeneratePreview}
+            previewItems={step5Preview.items}
+            previewSelectedIndex={step5Preview.selectedIndex}
+            onSelectPreview={step5Preview.setSelectedIndex}
+            previewOverallStatus={step5Preview.previewStatus}
+            previewOverallError={step5Preview.previewError}
+            previewOverallProgress={step5Preview.progress}
+            previewAnyGenerating={step5Preview.anyGenerating}
+            previewTemplateName={step5Preview.templateName}
+            previewMaterialCount={step5Preview.materialCount}
+            onGeneratePreview={step5Preview.generatePreview}
+            onRegeneratePreview={step5Preview.regeneratePreview}
           />
 
           <GenerateStepActions
@@ -236,22 +254,24 @@ const GeneratePage: React.FC = () => {
 
         {/* ════ 右侧：预览 + 生成结果 ════ */}
         <div className="xx-generate-right-col">
-          {/* 预览视频面板（Step4+ 常驻，展示选中的预览） */}
+          {/* 预览视频面板（Step4+ 常驻，Step4 显示标题预览，Step5+ 显示预览视频） */}
           {currentStep >= 4 && (
             <PreviewVideoPanel
-              previewStatus={step4Preview.previewStatus}
-              previewResult={step4Preview.previewResult}
-              previewError={step4Preview.previewError}
-              progress={step4Preview.progress}
+              previewStatus={step5Preview.previewStatus}
+              previewResult={step5Preview.previewResult}
+              previewError={step5Preview.previewError}
+              progress={step5Preview.progress}
               videoRatio={videoRatio}
-              onRegenerate={step4Preview.regeneratePreview}
+              onRegenerate={step5Preview.regeneratePreview}
               titleText={titleSettings.title}
-              titleSettings={currentStep >= 5 ? titleSettings : undefined}
+              titleSettings={titleSettings}
+              showTitlePreview={currentStep === 4}
+              sourceVideoUrl={sourceVideoUrl}
             />
           )}
 
-          {/* 正式生成结果（Step5+ 才显示） */}
-          {currentStep >= 5 && (
+          {/* 正式生成结果（Step6+ 才显示） */}
+          {currentStep >= 6 && (
             <GenerateResultPanel
               generated={generated}
               generating={generating}

apps/web/src/pages/generate/components/GenerateStepContent.tsx

@@ -1,20 +1,20 @@
 /**
  * GeneratePage 步骤内容渲染
  * 根据当前步骤渲染对应的 Step 组件
- * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 预览(4) → 标题(5) → 封面(6) → 确认(7)
+ * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 标题(4) → 预览(5) → 封面(6) → 确认(7)
  */
 import React from "react"
 import type { EditingTemplate } from "@/api/editing-planner"
 import type { PresetVoiceItem } from "@/api/voices"
 import type { VoiceClone } from "@/api/voice-clone"
-import type { CoverConfig } from "../../editing-planner/types"
+import type { CoverConfig } from "../types/cover"
 import type { TitleSettings } from "../types"
-import type { PreviewItem, PreviewStatus } from "../hooks/useStep4Preview"
+import type { PreviewItem, PreviewStatus } from "../hooks/useStep5Preview"
 import Step1TemplateSelect from "../components/Step1TemplateSelect"
 import Step2MaterialSelect from "../components/Step2MaterialSelect"
 import Step3VoiceSelect from "../components/Step5VoiceSelect"
-import Step4GeneratePreview from "../components/Step4GeneratePreview"
-import Step5TitleSettings from "../components/Step4TitleSettings"
+import Step5GeneratePreview from "../components/Step5GeneratePreview"
+import Step4TitleSettings from "../components/Step4TitleSettings"
 import Step6CoverSettings from "../components/Step6CoverSettings"
 import Step7ConfirmGenerate from "../components/Step7ConfirmGenerate"
 import type { GeneratedVideo } from "@/api/template-editor"
@@ -157,7 +157,14 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
       )
     case 4:
       return (
-        <Step4GeneratePreview
+        <Step4TitleSettings
+          titleSettings={titleSettings}
+          onTitleSettingsChange={onTitleSettingsChange}
+        />
+      )
+    case 5:
+      return (
+        <Step5GeneratePreview
           templateName={previewTemplateName}
           materialCount={previewMaterialCount}
           duration={duration}
@@ -175,13 +182,6 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
           onRegeneratePreview={onRegeneratePreview}
         />
       )
-    case 5:
-      return (
-        <Step5TitleSettings
-          titleSettings={titleSettings}
-          onTitleSettingsChange={onTitleSettingsChange}
-        />
-      )
     case 6:
       return (
         <Step6CoverSettings

apps/web/src/pages/generate/components/PreviewVideoPanel.tsx

@@ -13,8 +13,10 @@
  */
 import React, { useRef, useEffect, useCallback } from "react"
 import { PlayCircleOutlined, LoadingOutlined } from "@ant-design/icons"
-import type { PreviewResult, PreviewStatus } from "../hooks/useStep4Preview"
+import type { PreviewResult, PreviewStatus } from "../hooks/useStep5Preview"
 import type { TitleSettings } from "../types"
+import { drawTitleOnCanvas } from "../utils/drawTitleOnCanvas"
+import TitlePreviewCanvas from "./title/TitlePreviewCanvas"
 
 interface PreviewVideoPanelProps {
   previewStatus: PreviewStatus
@@ -23,134 +25,14 @@ interface PreviewVideoPanelProps {
   progress: number
   videoRatio: string
   onRegenerate: () => void
-  /** 标题文字（Step5 起传入） */
+  /** 标题文字 */
   titleText?: string
-  /** 标题样式设置（Step5 起传入） */
+  /** 标题样式设置 */
   titleSettings?: TitleSettings
-}
-
-/* ── Canvas 绘制工具函数 ── */
-
-/**
- * 将文本按 maxWidth 逐字换行，返回行数组。
- * 与 ASS 字幕引擎的逐字换行行为一致。
- */
-function wrapText(ctx: CanvasRenderingContext2D, text: string, maxWidth: number): string[] {
-  const lines: string[] = []
-  let currentLine = ""
-  for (const char of text) {
-    const testLine = currentLine + char
-    if (ctx.measureText(testLine).width > maxWidth && currentLine) {
-      lines.push(currentLine)
-      currentLine = char
-    } else {
-      currentLine = testLine
-    }
-  }
-  if (currentLine) lines.push(currentLine)
-  return lines
-}
-
-/**
- * 在 canvas 上绘制标题文字（含描边/阴影/多行居中）
- *
- * Canvas 已通过 CSS 定位到视频实际渲染位置，
- * 坐标系基于 Canvas 自身尺寸，居中直接使用 w/2。
- *
- * @param ctx canvas 上下文
- * @param w canvas CSS 宽度（= 视频渲染宽度）
- * @param h canvas CSS 高度（= 视频渲染高度）
- * @param text 标题文字
- * @param settings 标题样式
- * @param paddingX 左右边距（px），与 ASS 的 MarginL/MarginR 对应
- * @param position "top" | "center" | "bottom"
- * @param topOffset 顶部/底部偏移量
- */
-function drawTitleOnCanvas(
-  ctx: CanvasRenderingContext2D,
-  w: number,
-  h: number,
-  text: string,
-  settings: TitleSettings,
-  paddingX: number,
-  position: string,
-  topOffset: number,
-) {
-  const dpr = window.devicePixelRatio || 1
-
-  // 设置 canvas 物理像素尺寸（高清屏适配）
-  ctx.canvas.width = Math.round(w * dpr)
-  ctx.canvas.height = Math.round(h * dpr)
-  ctx.scale(dpr, dpr)
-
-  // 清除
-  ctx.clearRect(0, 0, w, h)
-
-  // 可用宽度 = 总宽 - 左右边距
-  const availableWidth = w - paddingX * 2
-  if (availableWidth <= 0) return
-
-  // 字体设置
-  const fontSize = Math.round(Math.min(settings.size, 36))
-  const fontWeight = settings.bold ? "bold" : "normal"
-  const fontStyle = settings.italic ? "italic" : "normal"
-  ctx.font = `${fontStyle} ${fontWeight} ${fontSize}px "${settings.font}"`
-
-  // 文字属性
-  ctx.textAlign = "center"
-  ctx.textBaseline = "middle"
-  ctx.fillStyle = settings.color
-
-  const lineHeight = fontSize * 1.4
-
-  // 描边 & 阴影
-  if (settings.stroke) {
-    ctx.strokeStyle = "rgba(0,0,0,0.6)"
-    ctx.lineWidth = 2
-    ctx.lineJoin = "round"
-  }
-  if (settings.shadow) {
-    ctx.shadowColor = "rgba(0,0,0,0.7)"
-    ctx.shadowBlur = 4
-    ctx.shadowOffsetX = 2
-    ctx.shadowOffsetY = 2
-  }
-
-  // 换行
-  const displayText = text && text.trim() ? text : "请选择或输入标题"
-  const lines = wrapText(ctx, displayText, availableWidth)
-
-  // 起始 Y：根据 position 计算
-  const totalTextHeight = lines.length * lineHeight
-  let startY: number
-  switch (position) {
-    case "top":
-      startY = topOffset
-      break
-    case "center":
-      startY = (h - totalTextHeight) / 2 + lineHeight / 2
-      break
-    case "bottom":
-    default:
-      startY = h - topOffset - totalTextHeight + lineHeight / 2
-      break
-  }
-
-  // 居中 x = w/2（Canvas 已定位到视频位置，无需额外偏移）
-  const x = w / 2
-  lines.forEach((line, i) => {
-    const y = startY + i * lineHeight
-    if (settings.stroke) ctx.strokeText(line, x, y)
-    ctx.fillText(line, x, y)
-  })
-
-  // 重置 shadow（避免影响后续绘制）
-  if (settings.shadow) {
-    ctx.shadowColor = "transparent"
-    ctx.shadowBlur = 0
-    ctx.shadowOffsetX = 0
-    ctx.shadowOffsetY = 0
-  }
+  /** Step4 标题预览模式 */
+  showTitlePreview?: boolean
+  /** 素材视频 URL（用于 Step4 标题预览背景） */
+  sourceVideoUrl?: string
 }
 
 /* ── 组件 ── */
@@ -164,11 +46,12 @@ export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
   onRegenerate,
   titleText,
   titleSettings,
+  showTitlePreview,
+  sourceVideoUrl,
 }) => {
   const hasPreview = previewStatus === "ready" && previewResult
   const isLoading = previewStatus === "pending" || previewStatus === "generating"
   const isError = previewStatus === "error"
-  const showTitlePreview = !!titleSettings
   const videoAspectStyle = { aspectRatio: (videoRatio || "16:9").replace(":", "/") }
 
   // video 模式 refs
@@ -293,12 +176,35 @@ export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
   return (
     <div className="xx-generate-preview">
       <div className="xx-preview-header">
-        <h3>预览视频</h3>
-        {hasPreview && <span className="xx-preview-badge">480p 预览版</span>}
+        <h3>{showTitlePreview ? "标题预览" : "预览视频"}</h3>
+        {hasPreview && !showTitlePreview && <span className="xx-preview-badge">480p 预览版</span>}
       </div>
 
-      {/* 空状态：还没生成预览 */}
-      {previewStatus === "idle" && (
+      {/* Step4 标题预览模式 */}
+      {showTitlePreview && titleSettings && titleText && (
+        <div style={{ padding: "0 16px 16px" }}>
+          <TitlePreviewCanvas
+            titleText={titleText}
+            titleSettings={titleSettings}
+            videoRatio="9:16"
+            sourceVideoUrl={sourceVideoUrl}
+          />
+        </div>
+      )}
+
+      {/* Step4 但无标题时的空状态 */}
+      {showTitlePreview && (!titleText || !titleSettings) && (
+        <div className="xx-preview-empty">
+          <PlayCircleOutlined
+            style={{ fontSize: 48, color: "var(--text-tertiary)", marginBottom: 12 }}
+          />
+          <p className="xx-preview-empty-title">请输入标题</p>
+          <p className="xx-preview-empty-desc">在左侧设置标题后，这里会实时预览效果</p>
+        </div>
+      )}
+
+      {/* 空状态：还没生成预览（非 Step4 模式） */}
+      {!showTitlePreview && previewStatus === "idle" && (
         <div className="xx-preview-empty">
           <PlayCircleOutlined
             style={{ fontSize: 48, color: "var(--text-tertiary)", marginBottom: 12 }}
@@ -308,8 +214,8 @@ export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
         </div>
       )}
 
-      {/* 生成中 */}
-      {isLoading && (
+      {/* 生成中（非 Step4 模式） */}
+      {!showTitlePreview && isLoading && (
         <div className="xx-preview-loading-panel">
           <div className="xx-preview-video" style={videoAspectStyle}>
             <div className="xx-preview-loading-center">
@@ -325,8 +231,8 @@ export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
         </div>
       )}
 
-      {/* 生成失败 */}
-      {isError && (
+      {/* 生成失败（非 Step4 模式） */}
+      {!showTitlePreview && isError && (
         <div className="xx-preview-error-panel">
           <div className="xx-preview-video xx-preview-video--error" style={videoAspectStyle}>
             <p style={{ color: "rgba(255,255,255,0.8)", fontSize: 14 }}>预览生成失败</p>
@@ -369,8 +275,8 @@ export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
         </div>
       )}
 
-      {/* 预览信息 */}
-      {hasPreview && previewResult && (
+      {/* 预览信息（非 Step4 模式） */}
+      {!showTitlePreview && hasPreview && previewResult && (
         <div className="xx-preview-info">
           <div className="xx-preview-info-row">
             <span>时长</span>

apps/web/src/pages/generate/components/Step5GeneratePreview.tsx

@@ -1,5 +1,5 @@
 /**
- * Step 4 生成预览组件（支持多预览）
+ * Step 5 生成预览组件（支持多预览）
  * 调用后端预览生成接口，展示多个真实视频预览（网格布局）
  */
 import React from "react"
@@ -12,9 +12,9 @@ import {
   ClockCircleOutlined,
 } from "@ant-design/icons"
 import { InputNumber } from "antd"
-import type { PreviewItem, PreviewStatus } from "../hooks/useStep4Preview"
+import type { PreviewItem, PreviewStatus } from "../hooks/useStep5Preview"
 
-interface Step4GeneratePreviewProps {
+interface Step5GeneratePreviewProps {
   templateName: string
   materialCount: string
   duration: number
@@ -39,7 +39,7 @@ const PREVIEW_COUNT_OPTIONS = [
   { value: 3, label: "3个" },
 ]
 
-const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
+const Step5GeneratePreview: React.FC<Step5GeneratePreviewProps> = ({
   templateName: _templateName,
   materialCount: _materialCount,
   videoRatio,
@@ -161,54 +161,57 @@ const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
                   transition: "all 0.2s",
                 }}
               >
-                {/* 缩略图/状态区域 */}
+                {/* 轻量卡片：深色背景 + 状态指示 */}
                 <div
                   style={{
                     aspectRatio,
-                    background: "#000",
+                    background: "#1a1a2e",
                     display: "flex",
+                    flexDirection: "column",
                     alignItems: "center",
                     justifyContent: "center",
                     position: "relative",
+                    gap: 8,
                   }}
                 >
-                  {item.status === "ready" && item.result && (
-                    <video
-                      src={item.result.videoUrl}
-                      controls
-                      autoPlay
-                      muted
-                      loop
-                      preload="metadata"
-                      style={{
-                        width: "100%",
-                        height: "100%",
-                        objectFit: "cover",
-                      }}
-                    />
-                  )}
-                  {(item.status === "pending" || item.status === "generating") && (
-                    <div style={{ textAlign: "center" }}>
-                      <LoadingOutlined style={{ fontSize: 24, color: "#fff" }} spin />
-                      <p style={{ color: "rgba(255,255,255,0.8)", fontSize: 12, marginTop: 8 }}>
-                        {item.status === "pending" ? "排队中..." : `生成中 ${item.progress}%`}
-                      </p>
+                  {/* 中心：预览编号 */}
+                  <span
+                    style={{
+                      fontSize: 24,
+                      fontWeight: 700,
+                      color: "#fff",
+                      opacity: 0.9,
+                    }}
+                  >
+                    预览 #{item.index + 1}
+                  </span>
+
+                  {/* 状态指示 */}
+                  {item.status === "generating" && (
+                    <div style={{ display: "flex", alignItems: "center", gap: 6 }}>
+                      <LoadingOutlined style={{ fontSize: 14, color: "#fff" }} spin />
+                      <span style={{ color: "rgba(255,255,255,0.8)", fontSize: 12 }}>
+                        生成中 {item.progress}%
+                      </span>
                     </div>
                   )}
+                  {item.status === "pending" && (
+                    <div style={{ display: "flex", alignItems: "center", gap: 6 }}>
+                      <ClockCircleOutlined
+                        style={{ fontSize: 14, color: "rgba(255,255,255,0.6)" }}
+                      />
+                      <span style={{ color: "rgba(255,255,255,0.6)", fontSize: 12 }}>
+                        排队中...
+                      </span>
+                    </div>
+                  )}
+                  {item.status === "ready" && (
+                    <CheckCircleFilled style={{ fontSize: 18, color: "#52c41a" }} />
+                  )}
                   {item.status === "error" && (
-                    <div style={{ textAlign: "center", padding: 8 }}>
-                      <ExclamationCircleFilled style={{ fontSize: 20, color: "#ef4444" }} />
-                      <p
-                        style={{
-                          color: "rgba(255,255,255,0.7)",
-                          fontSize: 11,
-                          marginTop: 4,
-                        }}
-                      >
-                        生成失败
-                      </p>
-                    </div>
+                    <ExclamationCircleFilled style={{ fontSize: 18, color: "#ef4444" }} />
                   )}
+
                   {/* 选中角标 */}
                   {isSelected && item.status === "ready" && (
                     <div
@@ -227,22 +230,6 @@ const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
                     </div>
                   )}
                 </div>
-                {/* 底部信息 */}
-                {item.status === "ready" && item.result && (
-                  <div
-                    style={{
-                      padding: "6px 8px",
-                      background: "#fafafa",
-                      fontSize: 11,
-                      color: "#666",
-                      display: "flex",
-                      justifyContent: "space-between",
-                    }}
-                  >
-                    <span>{item.result.duration.toFixed(1)}秒</span>
-                    <span>{item.result.clipCount}段</span>
-                  </div>
-                )}
               </div>
             )
           })}
@@ -291,4 +278,4 @@ const Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
   )
 }
 
-export default Step4GeneratePreview
+export default Step5GeneratePreview

apps/web/src/pages/generate/components/Step6CoverSettings.tsx

@@ -1,5 +1,6 @@
 import React from "react"
-import type { CoverConfig } from "../../editing-planner/types"
+import { Modal, Spin } from "antd"
+import type { CoverConfig } from "../types/cover"
 import { useStep6Cover } from "../hooks/useStep6Cover"
 import Button from "@/components/ui/Button"
 import CoverSettingsModal from "./cover-settings/CoverSettingsModal"
@@ -18,6 +19,7 @@ interface Step6CoverSettingsProps {
 const Step6CoverSettings: React.FC<Step6CoverSettingsProps> = (props) => {
   const {
     coverSettings,
+    generating,
     generateAutoCover,
     showCoverSettings,
     setShowCoverSettings,
@@ -95,6 +97,14 @@ const Step6CoverSettings: React.FC<Step6CoverSettingsProps> = (props) => {
         template={editingTemplate}
         onSave={handleSaveTemplate}
       />
+
+      {/* AI 生成封面进度弹窗 */}
+      <Modal open={generating} closable={false} footer={null} centered>
+        <div style={{ textAlign: "center", padding: "24px 0" }}>
+          <Spin size="large" />
+          <p style={{ marginTop: 16, fontSize: 14, color: "#666" }}>AI 正在生成封面，请稍候...</p>
+        </div>
+      </Modal>
     </div>
   )
 }

apps/web/src/pages/generate/components/Step7ConfirmGenerate.tsx

@@ -4,7 +4,7 @@
 import React from "react"
 import type { EditingTemplate } from "@/api/editing-planner"
 import type { GeneratedVideo } from "@/api/template-editor"
-import type { CoverConfig } from "../../editing-planner/types"
+import type { CoverConfig } from "../types/cover"
 import type { VoiceClone } from "@/api/voice-clone"
 import type { PresetVoiceItem } from "@/api/voices"
 import { useStep7Generate } from "../hooks/useStep7Generate"

apps/web/src/pages/generate/components/cover-settings/CoverEditorModal.tsx

@@ -1,5 +1,5 @@
 import React, { useState } from "react"
-import type { CoverTemplate } from "../../../editing-planner/types"
+import type { CoverTemplate } from "../../types/cover"
 import Modal from "@/components/ui/Modal"
 import Button from "@/components/ui/Button"
 

apps/web/src/pages/generate/components/cover-settings/CoverModeSelector.tsx

@@ -1,5 +1,5 @@
 import React from "react"
-import type { CoverMode } from "../../../editing-planner/types"
+import type { CoverMode } from "../../types/cover"
 
 interface CoverModeSelectorProps {
   mode: CoverMode

apps/web/src/pages/generate/components/cover-settings/CoverSettingsModal.tsx

@@ -1,5 +1,5 @@
 import React from "react"
-import type { CoverTemplate } from "../../../editing-planner/types"
+import type { CoverTemplate } from "../../types/cover"
 import Modal from "@/components/ui/Modal"
 import Button from "@/components/ui/Button"
 

apps/web/src/pages/generate/components/title/TitlePreviewCanvas.tsx

@@ -0,0 +1,188 @@
+/**
+ * 标题实时预览 Canvas 组件
+ *
+ * 在 Step4 标题设置面板中嵌入，让用户实时看到标题文字、字体、大小、颜色、
+ * 位置、描边、阴影等样式的实际渲染效果（所见即所得）。
+ *
+ * 使用共享的 drawTitleOnCanvas 工具函数，与 PreviewVideoPanel 行为一致。
+ */
+import React, { useRef, useEffect } from "react"
+import type { TitleSettings } from "../../types"
+import { drawTitleOnCanvas } from "../../utils/drawTitleOnCanvas"
+
+interface TitlePreviewCanvasProps {
+  /** 标题文字 */
+  titleText: string
+  /** 标题样式设置 */
+  titleSettings: TitleSettings
+  /** 视频比例，默认 "9:16"（竖屏） */
+  videoRatio?: string
+  /** 素材视频 URL（作为背景显示） */
+  sourceVideoUrl?: string
+}
+
+/**
+ * 解析 videoRatio 字符串为 aspect-ratio CSS 值
+ */
+function parseAspect(ratio: string): string {
+  return (ratio || "9:16").replace(":", "/")
+}
+
+const TitlePreviewCanvas: React.FC<TitlePreviewCanvasProps> = ({
+  titleText,
+  titleSettings,
+  videoRatio = "9:16",
+  sourceVideoUrl,
+}) => {
+  const containerRef = useRef<HTMLDivElement>(null)
+  const canvasRef = useRef<HTMLCanvasElement>(null)
+
+  // 字体加载状态
+  const fontLoadedRef = useRef(false)
+
+  /** 在 Canvas 上绘制标题 */
+  const draw = () => {
+    const canvas = canvasRef.current
+    const container = containerRef.current
+    if (!canvas || !container) return
+    const ctx = canvas.getContext("2d")
+    if (!ctx) return
+
+    const rect = container.getBoundingClientRect()
+    if (rect.width <= 0 || rect.height <= 0) return
+
+    const w = rect.width
+    const h = rect.height
+
+    // 更新 Canvas CSS 尺寸匹配容器
+    canvas.style.width = `${w}px`
+    canvas.style.height = `${h}px`
+
+    drawTitleOnCanvas(ctx, w, h, titleText, titleSettings, 24, titleSettings.position, 40)
+  }
+
+  // 字体加载：确保 measureText 使用正确字体
+  useEffect(() => {
+    let cancelled = false
+    fontLoadedRef.current = false
+
+    const fontWeight = titleSettings.bold ? "bold" : ""
+    const fontStyle = titleSettings.italic ? "italic" : ""
+    const fontSpec =
+      `${fontStyle} ${fontWeight} ${titleSettings.size}px "${titleSettings.font}"`.trim()
+
+    const onFontReady = () => {
+      if (cancelled) return
+      fontLoadedRef.current = true
+      requestAnimationFrame(() => {
+        if (!cancelled) draw()
+      })
+    }
+
+    // 用 FontFace API 加载字体，失败则降级
+    try {
+      const fontFace = new FontFace(titleSettings.font, `local("${titleSettings.font}")`)
+      fontFace
+        .load()
+        .then(() => {
+          if (!cancelled) {
+            ;(document.fonts as any).add(fontFace)
+            onFontReady()
+          }
+        })
+        .catch(() => {
+          // 字体加载失败，用默认字体继续
+          onFontReady()
+        })
+    } catch {
+      // FontFace 不可用，直接绘制
+      onFontReady()
+    }
+
+    // 同时检查 document.fonts 是否已有该字体
+    if (document.fonts.check(fontSpec)) {
+      onFontReady()
+      return
+    }
+
+    return () => {
+      cancelled = true
+    }
+  }, [titleSettings.font, titleSettings.size, titleSettings.bold, titleSettings.italic])
+
+  // props 变化时重绘
+  useEffect(() => {
+    requestAnimationFrame(draw)
+  }, [titleText, titleSettings])
+
+  // ResizeObserver 监听容器尺寸变化
+  useEffect(() => {
+    const container = containerRef.current
+    if (!container) return
+
+    const observer = new ResizeObserver(() => {
+      requestAnimationFrame(draw)
+    })
+    observer.observe(container)
+
+    return () => observer.disconnect()
+  }, [])
+
+  return (
+    <div>
+      <div
+        style={{
+          fontSize: 12,
+          color: "var(--text-tertiary, #999)",
+          marginBottom: 6,
+          fontWeight: 500,
+        }}
+      >
+        预览效果
+      </div>
+      <div
+        ref={containerRef}
+        style={{
+          width: "100%",
+          aspectRatio: parseAspect(videoRatio),
+          background: sourceVideoUrl
+            ? "#000"
+            : "linear-gradient(135deg, #1a1a2e, #16213e, #0f3460)",
+          borderRadius: 8,
+          overflow: "hidden",
+          position: "relative",
+        }}
+      >
+        {sourceVideoUrl && (
+          <video
+            src={sourceVideoUrl}
+            muted
+            loop
+            autoPlay
+            playsInline
+            style={{
+              position: "absolute",
+              top: 0,
+              left: 0,
+              width: "100%",
+              height: "100%",
+              objectFit: "cover",
+            }}
+          />
+        )}
+        <canvas
+          ref={canvasRef}
+          style={{
+            position: "absolute",
+            top: 0,
+            left: 0,
+            width: "100%",
+            height: "100%",
+          }}
+        />
+      </div>
+    </div>
+  )
+}
+
+export default TitlePreviewCanvas

apps/web/src/pages/generate/constants.ts

@@ -2,7 +2,7 @@
  * 智能剪辑页面 — 常量定义
  */
 
-import type { CoverConfig } from "../editing-planner/types"
+import type { CoverConfig } from "./types/cover"
 
 /* ── 克隆声音状态配置 ── */
 export const CLONE_STATUS_CONFIG: Record<string, { label: string; color: string }> = {
@@ -32,8 +32,8 @@ export const STEPS = [
   { key: 1, label: "选择模板" },
   { key: 2, label: "选择素材" },
   { key: 3, label: "选择配音" },
-  { key: 4, label: "生成预览" },
-  { key: 5, label: "选择标题" },
+  { key: 4, label: "选择标题" },
+  { key: 5, label: "生成预览" },
   { key: 6, label: "选择封面" },
   { key: 7, label: "确认生成" },
 ]

apps/web/src/pages/generate/hooks/generate-video/types.ts

@@ -1,5 +1,5 @@
 import type { GeneratedVideo, EditPlanConfig } from "@/api/template-editor"
-import type { CoverConfig } from "../../../editing-planner/types"
+import type { CoverConfig } from "../../types/cover"
 import type { TitleSettings } from "../../types"
 
 /** useGenerateVideo 入参 */

apps/web/src/pages/generate/hooks/useGenerateFormState/index.ts

@@ -6,7 +6,7 @@ import { useState } from "react"
 import { useSearchParams } from "react-router-dom"
 import type { GeneratedVideo } from "@/api/template-editor"
 import type { EditingTemplate } from "@/api/editing-planner"
-import type { CoverConfig } from "../../../editing-planner/types"
+import type { CoverConfig } from "../../types/cover"
 import type { PresetVoiceItem } from "@/api/voices"
 import { DEFAULT_COVER_SETTINGS } from "../../constants"
 import type { TitleSettings } from "../../types"

apps/web/src/pages/generate/hooks/useGenerateFormState/usePlanConfigLoader.ts

@@ -1,5 +1,5 @@
 import { useEffect } from "react"
-import type { CoverConfig } from "../../../editing-planner/types"
+import type { CoverConfig } from "../../types/cover"
 import type { TitleSettings } from "../../types"
 import type { TitleConfig } from "@/api/template-editor"
 import { getEditPlan } from "@/api/template-editor"

apps/web/src/pages/generate/hooks/useGenerateFormState/useTitleCoverSync.ts

@@ -1,6 +1,6 @@
 import { useEffect } from "react"
 import type { TitleSettings } from "../../types"
-import type { CoverConfig } from "../../../editing-planner/types"
+import type { CoverConfig } from "../../types/cover"
 import type { EditingTemplate } from "@/api/editing-planner"
 
 interface UseTitleCoverSyncOptions {

apps/web/src/pages/generate/hooks/useGenerateVideo.ts

@@ -56,10 +56,41 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
 
     try {
       // 使用确认生成 API（基于预览任务）
-      // 解析分辨率
-      const [widthStr, heightStr] = (props.videoRatio || "1080x1920").split("x")
-      const outputWidth = parseInt(widthStr, 10) || 1080
-      const outputHeight = parseInt(heightStr, 10) || 1920
+      // 解析分辨率：videoRatio 可能是 "9:16"（宽高比）或 "1080x1920"（分辨率）
+      const ratio = props.videoRatio || "9:16"
+      let outputWidth: number
+      let outputHeight: number
+
+      if (ratio.includes(":")) {
+        // 宽高比格式，如 "9:16" → 基于基准高度 1920 计算
+        const [rw, rh] = ratio.split(":").map(Number)
+        if (rw > 0 && rh > 0) {
+          // 基准：长边 1920，短边按比例计算
+          const [longSide, shortSide] = rw < rh ? [rh, rw] : [rw, rh]
+          const baseLong = 1920
+          const baseShort = Math.round((baseLong * shortSide) / longSide)
+          // 确保偶数（FFmpeg 要求）
+          const evenShort = baseShort - (baseShort % 2)
+          if (rw < rh) {
+            outputWidth = evenShort
+            outputHeight = baseLong
+          } else {
+            outputWidth = baseLong
+            outputHeight = evenShort
+          }
+        } else {
+          outputWidth = 1080
+          outputHeight = 1920
+        }
+      } else if (ratio.includes("x")) {
+        // 分辨率格式，如 "1080x1920"
+        const [wStr, hStr] = ratio.split("x")
+        outputWidth = parseInt(wStr, 10) || 1080
+        outputHeight = parseInt(hStr, 10) || 1920
+      } else {
+        outputWidth = 1080
+        outputHeight = 1920
+      }
 
       await confirmGeneration(props.previewTaskId, {
         output_width: outputWidth,
@@ -78,7 +109,7 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
       setGenerateError(finalMsg)
       message.error(finalMsg)
     }
-  }, [props, selectedTemplate, clearTimer, startPolling])
+  }, [props, clearTimer, startPolling])
 
   /* 重新生成（失败后重试） */
   const retry = useCallback(() => {

apps/web/src/pages/generate/hooks/useStep5Preview.ts

@@ -1,12 +1,14 @@
 /**
- * Step 4 生成预览 Hook（支持多预览 + voice_ids）
+ * Step 5 生成预览 Hook（支持多预览 + voice_ids）
  * 调用 /generation/preview 接口创建多个预览任务，轮询状态直到全部完成
  */
 import { useState, useCallback, useMemo, useEffect, useRef } from "react"
 import { createPreview, getPreviewStatus } from "@/api/generation"
+import { updateEditPlan } from "@/api/template-editor/editPlans"
 import type { PreviewTaskResponse, PreviewStatus as ApiPreviewStatus } from "@/api/generation"
 import type { EditingTemplate } from "@/api/editing-planner"
 import { safeExtractError } from "./generate-video/errorUtils"
+import type { TitleSettings } from "../types"
 
 /** 安全地将值转为字符串，防止对象被直接渲染导致 React Error #31 */
 const safeString = (val: unknown, fallback: string): string => {
@@ -25,7 +27,7 @@ const safeNumber = (val: unknown, fallback = 0): number => {
   return fallback
 }
 
-interface UseStep4PreviewProps {
+interface UseStep5PreviewProps {
   templates: EditingTemplate[]
   selectedTemplate: string
   materialMode: "manual" | "auto"
@@ -39,6 +41,8 @@ interface UseStep4PreviewProps {
   voiceLibraryId?: string
   /** 要生成的预览数量 */
   previewCount?: number
+  /** 标题设置（传递给后端，让预览视频包含标题） */
+  titleSettings?: TitleSettings
 }
 
 export type PreviewStatus = "idle" | "pending" | "generating" | "ready" | "error"
@@ -77,7 +81,7 @@ const createInitialItem = (index: number): PreviewItem => ({
   progress: 0,
 })
 
-export function useStep4Preview({
+export function useStep5Preview({
   templates,
   selectedTemplate,
   materialMode,
@@ -88,7 +92,8 @@ export function useStep4Preview({
   voiceIds,
   voiceLibraryId,
   previewCount = 1,
-}: UseStep4PreviewProps) {
+  titleSettings,
+}: UseStep5PreviewProps) {
   const templateName = useMemo(
     () => templates.find((t) => t.id === selectedTemplate)?.name ?? "未选择",
     [templates, selectedTemplate],
@@ -152,6 +157,7 @@ export function useStep4Preview({
     duration,
     videoRatio,
     voiceIds: [...(voiceIds || [])].sort().join(","),
+    titleSettings: titleSettings?.title || "",
   })
 
   useEffect(() => {
@@ -163,6 +169,7 @@ export function useStep4Preview({
       duration,
       videoRatio,
       [...(voiceIds || [])].sort().join(","),
+      titleSettings?.title || "",
     ].join("|")
 
     const prevKey = [
@@ -173,6 +180,7 @@ export function useStep4Preview({
       prevDepsRef.current.duration,
       prevDepsRef.current.videoRatio,
       prevDepsRef.current.voiceIds,
+      prevDepsRef.current.titleSettings,
     ].join("|")
 
     if (prevKey !== currentKey && items.some((it) => it.status !== "idle")) {
@@ -190,6 +198,7 @@ export function useStep4Preview({
       duration,
       videoRatio,
       voiceIds: [...(voiceIds || [])].sort().join(","),
+      titleSettings: titleSettings?.title || "",
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [
@@ -201,6 +210,7 @@ export function useStep4Preview({
     videoRatio,
     voiceIds,
     previewCount,
+    titleSettings,
   ])
 
   // 组件卸载时清理所有轮询
@@ -211,90 +221,102 @@ export function useStep4Preview({
   }, [clearPollTimer])
 
   /** 轮询单个预览任务状态 */
-  const pollPreviewStatus = useCallback((index: number, taskId: string) => {
-    const poll = async () => {
-      // 竞态检查
-      if (taskIdsRef.current.get(index) !== taskId) return
-
-      // 超时检查
-      if (Date.now() - startTimeRef.current > POLL_TIMEOUT_MS) {
-        setItems((prev) =>
-          prev.map((it) =>
-            it.index === index ? { ...it, status: "error", error: "预览生成超时，请重试" } : it,
-          ),
-        )
-        return
-      }
-
-      try {
-        const data: PreviewTaskResponse = await getPreviewStatus(taskId)
-
+  const pollPreviewStatus = useCallback(
+    (index: number, taskId: string) => {
+      const poll = async () => {
+        // 竞态检查
         if (taskIdsRef.current.get(index) !== taskId) return
 
-        const status = data.status as ApiPreviewStatus
+        // 超时检查
+        if (Date.now() - startTimeRef.current > POLL_TIMEOUT_MS) {
+          setItems((prev) =>
+            prev.map((it) =>
+              it.index === index ? { ...it, status: "error", error: "预览生成超时，请重试" } : it,
+            ),
+          )
+          return
+        }
 
-        if (status === "completed") {
-          const result: PreviewResult = {
-            taskId: safeString(data.task_id, ""),
-            videoUrl: safeString(data.video_url, ""),
-            clipCount: safeNumber(data.clip_count),
-            transitionCount: safeNumber(data.transition_count),
-            materialUsage: safeNumber(data.material_usage),
-            duration: safeNumber(data.duration),
-            fileSize: safeNumber(data.file_size),
-            generateDuration: safeNumber(data.generate_duration),
-            progress: 100,
+        try {
+          const data: PreviewTaskResponse = await getPreviewStatus(taskId)
+
+          if (taskIdsRef.current.get(index) !== taskId) return
+
+          const status = data.status as ApiPreviewStatus
+
+          if (status === "completed") {
+            const result: PreviewResult = {
+              taskId: safeString(data.task_id, ""),
+              videoUrl: safeString(data.video_url, ""),
+              clipCount: safeNumber(data.clip_count),
+              transitionCount: safeNumber(data.transition_count),
+              materialUsage: safeNumber(data.material_usage),
+              duration: safeNumber(data.duration),
+              fileSize: safeNumber(data.file_size),
+              generateDuration: safeNumber(data.generate_duration),
+              progress: 100,
+            }
+            setItems((prev) =>
+              prev.map((it) =>
+                it.index === index ? { ...it, status: "ready", result, progress: 100 } : it,
+              ),
+            )
+
+            // 保存预览视频 URL 到 plan config，供封面生成使用
+            if (result.videoUrl && selectedTemplate) {
+              updateEditPlan(selectedTemplate, {
+                config: { rendered_storage_key: result.videoUrl },
+              }).catch((err) => {
+                console.warn("[Step4] 保存预览视频URL到plan config失败:", err)
+              })
+            }
+            return
           }
+
+          if (status === "failed") {
+            setItems((prev) =>
+              prev.map((it) =>
+                it.index === index
+                  ? {
+                      ...it,
+                      status: "error",
+                      error: safeString(data.error_message, "预览生成失败，请重试"),
+                    }
+                  : it,
+              ),
+            )
+            return
+          }
+
+          if (status === "cancelled") {
+            setItems((prev) =>
+              prev.map((it) =>
+                it.index === index ? { ...it, status: "error", error: "预览任务已取消" } : it,
+              ),
+            )
+            return
+          }
+
+          // pending / generating 状态继续轮询
+          const prog = safeNumber(data.progress)
+          const nextStatus: PreviewStatus = status === "pending" ? "pending" : "generating"
           setItems((prev) =>
             prev.map((it) =>
-              it.index === index ? { ...it, status: "ready", result, progress: 100 } : it,
+              it.index === index ? { ...it, status: nextStatus, progress: prog } : it,
             ),
           )
-          return
+          const delay = status === "pending" ? 5000 : 2000
+          pollTimersRef.current.set(index, setTimeout(poll, delay))
+        } catch {
+          if (taskIdsRef.current.get(index) !== taskId) return
+          pollTimersRef.current.set(index, setTimeout(poll, 3000))
         }
-
-        if (status === "failed") {
-          setItems((prev) =>
-            prev.map((it) =>
-              it.index === index
-                ? {
-                    ...it,
-                    status: "error",
-                    error: safeString(data.error_message, "预览生成失败，请重试"),
-                  }
-                : it,
-            ),
-          )
-          return
-        }
-
-        if (status === "cancelled") {
-          setItems((prev) =>
-            prev.map((it) =>
-              it.index === index ? { ...it, status: "error", error: "预览任务已取消" } : it,
-            ),
-          )
-          return
-        }
-
-        // pending / generating 状态继续轮询
-        const prog = safeNumber(data.progress)
-        const nextStatus: PreviewStatus = status === "pending" ? "pending" : "generating"
-        setItems((prev) =>
-          prev.map((it) =>
-            it.index === index ? { ...it, status: nextStatus, progress: prog } : it,
-          ),
-        )
-        const delay = status === "pending" ? 5000 : 2000
-        pollTimersRef.current.set(index, setTimeout(poll, delay))
-      } catch {
-        if (taskIdsRef.current.get(index) !== taskId) return
-        pollTimersRef.current.set(index, setTimeout(poll, 3000))
       }
-    }
 
-    pollTimersRef.current.set(index, setTimeout(poll, 1000))
-  }, [])
+      pollTimersRef.current.set(index, setTimeout(poll, 1000))
+    },
+    [selectedTemplate],
+  )
 
   /** 生成所有预览 */
   const generatePreview = useCallback(async () => {
@@ -336,6 +358,19 @@ export function useStep4Preview({
           video_ratio: videoRatio,
           voice_ids: voiceIds && voiceIds.length > 0 ? voiceIds : undefined,
           voice_library_id: voiceLibraryId || undefined,
+          // 标题烧录配置
+          title_config: titleSettings?.title
+            ? {
+                text: titleSettings.title,
+                font: titleSettings.font,
+                font_size: titleSettings.size,
+                font_color: titleSettings.color,
+                position: titleSettings.position,
+                bold: titleSettings.bold,
+                stroke: titleSettings.stroke,
+                shadow: titleSettings.shadow,
+              }
+            : undefined,
         })
 
         if (startTimeRef.current === 0) return
@@ -361,6 +396,7 @@ export function useStep4Preview({
     voiceIds,
     voiceLibraryId,
     previewCount,
+    titleSettings,
     clearPollTimer,
     pollPreviewStatus,
   ])
@@ -437,4 +473,4 @@ export function useStep4Preview({
   }
 }
 
-export default useStep4Preview
+export default useStep5Preview

apps/web/src/pages/generate/hooks/useStep6Cover.ts

@@ -2,10 +2,10 @@
  * Step 6 封面设置 Hook
  * 封装封面设置的交互逻辑，对接后端封面模板 CRUD API
  */
-import { useCallback, useEffect, useRef, useState } from "react"
+import { useCallback, useEffect, useState } from "react"
 import { message } from "antd"
-import type { CoverConfig, CoverTemplate } from "../../editing-planner/types"
-import { generateCover } from "@/api/template-editor"
+import type { CoverConfig, CoverTemplate } from "../types/cover"
+import { generateCover } from "@/api/generation"
 import {
   fetchCoverTemplates,
   createCoverTemplate,
@@ -30,7 +30,7 @@ export function useStep6Cover({
   assetIds = [],
   selectedTemplate = "",
 }: UseStep6CoverProps) {
-  const generatingRef = useRef(false)
+  const [generating, setGenerating] = useState(false)
 
   // ── 封面设置弹窗状态 ──
   const [showCoverSettings, setShowCoverSettings] = useState(false)
@@ -67,7 +67,7 @@ export function useStep6Cover({
 
   /** 调用后端智能封面 API，生成封面并更新预览 */
   const generateAutoCover = useCallback(async () => {
-    if (generatingRef.current) {
+    if (generating) {
       message.warning("封面正在生成中，请稍候...")
       return
     }
@@ -82,12 +82,17 @@ export function useStep6Cover({
       return
     }
 
-    generatingRef.current = true
+    setGenerating(true)
+    // 超时保护：300 秒后强制重置，防止 state 卡死导致按钮永久失效
+    const timeoutId = setTimeout(() => {
+      setGenerating(false)
+    }, 300000)
     try {
       const response = await generateCover(selectedTemplate, {
         asset_ids: assetIds,
         cover_type: "ai_frame",
       })
+      clearTimeout(timeoutId)
       const thumbnailUrl = response.cover?.image_url || ""
       if (thumbnailUrl) {
         onCoverSettingsChange({
@@ -100,12 +105,35 @@ export function useStep6Cover({
         message.warning("封面生成未返回图片，请重试")
       }
     } catch (err) {
-      console.warn("[Step6] 智能封面生成失败:", err)
-      message.error("封面生成失败，请稍后重试")
+      clearTimeout(timeoutId)
+      console.error("[Step6] 智能封面生成失败:", err)
+
+      // 提取详细错误信息
+      let errorMsg = "封面生成失败"
+      const e = err as {
+        response?: { data?: { detail?: string; message?: string }; status?: number }
+        request?: unknown
+        message?: string
+      }
+      if (e.response) {
+        // 后端返回错误
+        const detail = e.response.data?.detail || e.response.data?.message || ""
+        errorMsg = detail || `后端错误 (${e.response.status})`
+        console.error("[Step6] 后端返回:", e.response.data)
+      } else if (e.request) {
+        // 请求已发送但无响应
+        errorMsg = "服务器无响应，请检查网络连接"
+        console.error("[Step6] 请求无响应:", e.request)
+      } else if (e.message) {
+        errorMsg = e.message
+      }
+
+      message.error(errorMsg)
     } finally {
-      generatingRef.current = false
+      clearTimeout(timeoutId)
+      setGenerating(false)
     }
-  }, [selectedTemplate, assetIds, coverSettings, onCoverSettingsChange])
+  }, [selectedTemplate, assetIds, coverSettings, onCoverSettingsChange, generating])
 
   // ── 模板操作方法 ──
   const handleSelectTemplate = useCallback((id: string) => {
@@ -165,6 +193,7 @@ export function useStep6Cover({
 
   return {
     coverSettings,
+    generating,
     generateAutoCover,
     totalDuration,
     showCoverSettings,

apps/web/src/pages/generate/hooks/useStep7Generate.ts

@@ -6,7 +6,7 @@ import { useMemo } from "react"
 import { useQuery } from "@tanstack/react-query"
 import type { EditingTemplate } from "@/api/editing-planner"
 import type { GeneratedVideo } from "@/api/template-editor"
-import type { CoverConfig } from "../../editing-planner/types"
+import type { CoverConfig } from "../types/cover"
 import type { VoiceClone } from "@/api/voice-clone"
 import type { PresetVoiceItem } from "@/api/voices"
 import { getAssetsByKind } from "@/api/assets"

apps/web/src/pages/generate/hooks/useStepNavigation.ts

@@ -1,7 +1,7 @@
 /**
  * GeneratePage 步骤导航
  * 管理步骤切换与各步骤的前置校验
- * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 预览(4) → 标题(5) → 封面(6) → 确认(7)
+ * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 标题(4) → 预览(5) → 封面(6) → 确认(7)
  */
 import { message } from "antd"
 import type { TitleSettings } from "../types"
@@ -49,12 +49,12 @@ export const useStepNavigation = (options: UseStepNavigationOptions): UseStepNav
       return
     }
     // Step3 配音：配音为可选项，不强制校验，用户可跳过
-    if (currentStep === 4 && !previewReady) {
-      message.warning("请先生成剪辑预览")
+    if (currentStep === 4 && !titleSettings.title.trim()) {
+      message.warning("请选择或输入标题")
       return
     }
-    if (currentStep === 5 && !titleSettings.title.trim()) {
-      message.warning("请选择或输入标题")
+    if (currentStep === 5 && !previewReady) {
+      message.warning("请先生成剪辑预览")
       return
     }
     if (currentStep < 7) {

apps/web/src/pages/generate/types/cover.ts

@@ -1,5 +1,6 @@
 /**
- * 封面配置类型
+ * 智能剪辑封面类型定义
+ * 独立于 editing-planner，仅供 generate 模块使用
  */
 
 /** 封面来源模式 */

apps/web/src/pages/generate/utils/drawTitleOnCanvas.ts

@@ -0,0 +1,126 @@
+/**
+ * Canvas 标题绘制工具函数（共享模块）
+ *
+ * 供 PreviewVideoPanel（预览视频标题叠加）和 TitlePreviewCanvas（标题设置实时预览）共用。
+ * 绘制行为与 ASS 字幕引擎一致：逐字换行、居中、描边/阴影。
+ */
+import type { TitleSettings } from "../types"
+
+/**
+ * 将文本按 maxWidth 逐字换行，返回行数组。
+ * 与 ASS 字幕引擎的逐字换行行为一致。
+ */
+export function wrapText(ctx: CanvasRenderingContext2D, text: string, maxWidth: number): string[] {
+  const lines: string[] = []
+  let currentLine = ""
+  for (const char of text) {
+    const testLine = currentLine + char
+    if (ctx.measureText(testLine).width > maxWidth && currentLine) {
+      lines.push(currentLine)
+      currentLine = char
+    } else {
+      currentLine = testLine
+    }
+  }
+  if (currentLine) lines.push(currentLine)
+  return lines
+}
+
+/**
+ * 在 canvas 上绘制标题文字（含描边/阴影/多行居中）
+ *
+ * @param ctx canvas 上下文
+ * @param w canvas CSS 宽度
+ * @param h canvas CSS 高度
+ * @param text 标题文字
+ * @param settings 标题样式
+ * @param paddingX 左右边距（px），与 ASS 的 MarginL/MarginR 对应
+ * @param position "top" | "center" | "bottom"
+ * @param topOffset 顶部/底部偏移量
+ */
+export function drawTitleOnCanvas(
+  ctx: CanvasRenderingContext2D,
+  w: number,
+  h: number,
+  text: string,
+  settings: TitleSettings,
+  paddingX: number,
+  position: string,
+  topOffset: number,
+) {
+  const dpr = window.devicePixelRatio || 1
+
+  // 设置 canvas 物理像素尺寸（高清屏适配）
+  ctx.canvas.width = Math.round(w * dpr)
+  ctx.canvas.height = Math.round(h * dpr)
+  ctx.scale(dpr, dpr)
+
+  // 清除
+  ctx.clearRect(0, 0, w, h)
+
+  // 可用宽度 = 总宽 - 左右边距
+  const availableWidth = w - paddingX * 2
+  if (availableWidth <= 0) return
+
+  // 字体设置
+  const fontSize = Math.round(Math.min(settings.size, 36))
+  const fontWeight = settings.bold ? "bold" : "normal"
+  const fontStyle = settings.italic ? "italic" : "normal"
+  ctx.font = `${fontStyle} ${fontWeight} ${fontSize}px "${settings.font}"`
+
+  // 文字属性
+  ctx.textAlign = "center"
+  ctx.textBaseline = "middle"
+  ctx.fillStyle = settings.color
+
+  const lineHeight = fontSize * 1.4
+
+  // 描边 & 阴影
+  if (settings.stroke) {
+    ctx.strokeStyle = "rgba(0,0,0,0.6)"
+    ctx.lineWidth = 2
+    ctx.lineJoin = "round"
+  }
+  if (settings.shadow) {
+    ctx.shadowColor = "rgba(0,0,0,0.7)"
+    ctx.shadowBlur = 4
+    ctx.shadowOffsetX = 2
+    ctx.shadowOffsetY = 2
+  }
+
+  // 换行
+  const displayText = text && text.trim() ? text : "请选择或输入标题"
+  const lines = wrapText(ctx, displayText, availableWidth)
+
+  // 起始 Y：根据 position 计算
+  const totalTextHeight = lines.length * lineHeight
+  let startY: number
+  switch (position) {
+    case "top":
+      startY = topOffset
+      break
+    case "center":
+      startY = (h - totalTextHeight) / 2 + lineHeight / 2
+      break
+    case "bottom":
+    default:
+      startY = h - topOffset - totalTextHeight + lineHeight / 2
+      break
+  }
+
+  // 居中 x = w/2
+  const x = w / 2
+  lines.forEach((line, i) => {
+    const y = startY + i * lineHeight
+    if (settings.stroke) ctx.strokeText(line, x, y)
+    ctx.fillText(line, x, y)
+  })
+
+  // 重置 shadow（避免影响后续绘制）
+  if (settings.shadow) {
+    ctx.shadowColor = "transparent"
+    ctx.shadowBlur = 0
+    ctx.shadowOffsetX = 0
+    ctx.shadowOffsetY = 0
+  }
+}

apps/web/src/test/api/edit-plans.test.ts

@@ -8,7 +8,6 @@ import {
   generateEditPlan,
   getGenerationStatus,
   aiRecommendClips,
-  generateCover,
   getEditPlanGenerations,
   getGenerationTaskResults,
   cancelGeneration,
@@ -182,22 +181,6 @@ describe("editPlans API", () => {
     })
   })
 
-  describe("generateCover", () => {
-    it("should resolve successfully", async () => {
-      await expect(generateCover("test-planId")).resolves.not.toThrow()
-    })
-
-    it("should reject on API error", async () => {
-      mockGet.mockRejectedValue(new Error("Network error"))
-      mockPost.mockRejectedValue(new Error("Network error"))
-      mockPut.mockRejectedValue(new Error("Network error"))
-      mockDelete.mockRejectedValue(new Error("Network error"))
-      mockPatch.mockRejectedValue(new Error("Network error"))
-
-      await expect(generateCover("test-planId")).rejects.toThrow()
-    })
-  })
-
   describe("getEditPlanGenerations", () => {
     it("should resolve successfully", async () => {
       await expect(getEditPlanGenerations("test-planId")).resolves.not.toThrow()

apps/web/src/test/pages/EditingPlanner.test.tsx

@@ -149,7 +149,6 @@ vi.mock("@/api/editing-planner", () => ({
 vi.mock("@/api/template-editor", () => ({
   getMediaAssets: vi.fn().mockResolvedValue({ items: [] }),
   getEditPlanGenerations: vi.fn().mockResolvedValue({ items: [] }),
-  generateCover: vi.fn().mockResolvedValue({}),
   getEditPlan: vi.fn().mockResolvedValue({}),
   createEditPlan: vi.fn().mockResolvedValue({ id: "test-plan" }),
   updateEditPlan: vi.fn().mockResolvedValue({}),
@@ -223,9 +222,6 @@ vi.mock("@/pages/editing-planner/components/GreenScreenPanel", () => ({
 vi.mock("@/pages/editing-planner/components/StickerPanel", () => ({
   default: () => React.createElement("div", { "data-testid": "StickerPanel" }),
 }))
-vi.mock("@/pages/editing-planner/components/CoverSelector", () => ({
-  default: () => React.createElement("div", { "data-testid": "CoverSelector" }),
-}))
 vi.mock("@/pages/editing-planner/components/SaveModal", () => ({
   default: () => React.createElement("div", { "data-testid": "SaveModal" }),
 }))
@@ -260,7 +256,6 @@ vi.mock("@/pages/editing-planner/types", () => ({
   DEFAULT_FILTER_CONFIG: { enabled: false },
   DEFAULT_CHROMA_KEY_CONFIG: { enabled: false },
   DEFAULT_STICKER_CONFIG: { enabled: false },
-  DEFAULT_COVER_CONFIG: { enabled: false },
 }))
 
 vi.mock("@/pages/editing-planner/types/subtitle", () => ({

apps/web/src/test/pages/editing-planner/components/CoverSelector.test.tsx

@@ -1,24 +0,0 @@
-import { describe, expect, it, vi } from "vitest"
-import { render } from "@testing-library/react"
-import CoverSelector from "@/pages/editing-planner/components/CoverSelector"
-import { DEFAULT_COVER_CONFIG } from "@/pages/editing-planner/types"
-
-const defaultProps = {
-  open: true,
-  onClose: vi.fn(),
-  config: DEFAULT_COVER_CONFIG,
-  onChange: vi.fn(),
-  totalDuration: 60,
-}
-
-describe("CoverSelector", () => {
-  it("should render without crashing", () => {
-    const { container } = render(<CoverSelector {...defaultProps} />)
-    expect(container).toBeTruthy()
-  })
-
-  it("should render when closed", () => {
-    const { container } = render(<CoverSelector {...defaultProps} open={false} />)
-    expect(container).toBeTruthy()
-  })
-})

apps/web/src/test/pages/editing-planner/components/PreviewPlayer.test.tsx

@@ -6,15 +6,10 @@ const defaultProps = {
   clips: [],
   selectedClipId: null,
   isPlaying: false,
-  currentCoverScheme: "scheme1",
-  coverSchemes: [{ id: "scheme1", name: "方案1", cover_url: "" }],
-  aiCoverLoading: false,
   titleSettings: undefined,
   subtitleSettings: undefined,
   onClipSelect: vi.fn(),
-  onCoverSchemeChange: vi.fn(),
   onPlayPause: vi.fn(),
-  onAiGenerateCover: vi.fn(),
 }
 
 describe("PreviewPlayer", () => {

apps/web/src/test/pages/editing-planner/smoke.test.tsx

@@ -28,7 +28,6 @@ import "@/pages/editing-planner/utils/clipProperties"
 // 子组件
 import "@/pages/editing-planner/components/BgmSelector"
 import "@/pages/editing-planner/components/ClipPropertiesPanel"
-import "@/pages/editing-planner/components/CoverSelector"
 import "@/pages/editing-planner/components/EditorClipList"
 import "@/pages/editing-planner/components/EditingDrawers"
 import "@/pages/editing-planner/components/FilterPanel"

apps/web/src/test/pages/generate/smoke.test.tsx

@@ -17,7 +17,7 @@ import "@/api/generation/types"
 // 直接引入所有 Step 组件，建立完整依赖链
 import "@/pages/generate/GeneratePage"
 import "@/pages/generate/components/Step2MaterialSelect"
-import "@/pages/generate/components/Step4GeneratePreview"
+import "@/pages/generate/components/Step5GeneratePreview"
 import "@/pages/generate/components/Step4TitleSettings"
 import "@/pages/generate/components/Step5VoiceSelect"
 import "@/pages/generate/components/PreviewVideoPanel"
@@ -47,7 +47,7 @@ describe("GeneratePage module smoke test", () => {
   })
 })
 import "@/pages/generate/hooks/useGenerateVideo"
-import "@/pages/generate/hooks/useStep4Preview"
+import "@/pages/generate/hooks/useStep5Preview"
 import "@/pages/generate/hooks/generate-video/useGenerationPolling"
 import "@/pages/generate/hooks/useGenerateFormState"
 import "@/pages/generate/hooks/useGenerateFormState/useTemplateSelection"

apps/web/src/test/pages/generate/step4-preview.smoke.test.tsx

@@ -1,17 +0,0 @@
-/**
- * Step4GeneratePreview smoke test
- * 确保 vitest related 模式能匹配到第4步预览生成相关文件的改动
- */
-import { describe, it, expect } from "vitest"
-
-import "@/pages/generate/components/Step4GeneratePreview"
-import "@/pages/generate/hooks/useStep4Preview"
-import "@/pages/generate/hooks/useStepNavigation"
-import "@/pages/generate/components/GenerateStepContent"
-import "@/pages/generate/GeneratePage"
-
-describe("Step4GeneratePreview module smoke test", () => {
-  it("should load all step4 preview modules", () => {
-    expect(true).toBe(true)
-  })
-})

apps/web/src/test/pages/generate/step5-preview.smoke.test.tsx

@@ -0,0 +1,17 @@
+/**
+ * Step5GeneratePreview smoke test
+ * 确保 vitest related 模式能匹配到第5步预览生成相关文件的改动
+ */
+import { describe, it, expect } from "vitest"
+
+import "@/pages/generate/components/Step5GeneratePreview"
+import "@/pages/generate/hooks/useStep5Preview"
+import "@/pages/generate/hooks/useStepNavigation"
+import "@/pages/generate/components/GenerateStepContent"
+import "@/pages/generate/GeneratePage"
+
+describe("Step5GeneratePreview module smoke test", () => {
+  it("should load all step5 preview modules", () => {
+    expect(true).toBe(true)
+  })
+})

apps/worker/video_processing/cover_generator.py

@@ -1,431 +0,0 @@
-"""视频封面生成器 — 从视频中提取/生成封面图.
-
-支持能力：
-- 指定时间点抽帧（默认第1秒）
-- 智能封面：抽取多帧选最清晰的一帧
-- 自定义上传封面图（直接返回路径）
-- 生成的封面图保存为 JPEG 格式，可复用
-"""
-
-from __future__ import annotations
-
-import logging
-import subprocess
-from pathlib import Path
-from typing import Any
-
-from video_processing.ffmpeg_utils import FFMPEG_BIN, probe_video_info, run_ffmpeg
-
-logger = logging.getLogger(__name__)
-
-
-# ── 配置常量 ──────────────────────────────────────────────────────────────────
-
-# 智能封面抽帧数量
-SMART_COVER_FRAME_COUNT = 3
-
-# 默认抽帧时间点（秒）
-DEFAULT_COVER_TIME = 1.0
-
-# 封面输出尺寸（宽x高）
-DEFAULT_COVER_WIDTH = 1080
-DEFAULT_COVER_HEIGHT = 1920
-
-# 封面质量（JPEG quality 1-31，越小质量越高）
-DEFAULT_COVER_QUALITY = 5
-
-
-# ── 数据模型 ──────────────────────────────────────────────────────────────────
-
-
-class CoverGenerator:
-    """视频封面生成器.
-
-    三种模式：
-    1. 指定时间点抽帧：从视频指定时间提取一帧
-    2. 智能封面：抽取3帧，用 blur 检测选最清晰的
-    3. 自定义上传：直接使用用户上传的图片
-    """
-
-    @staticmethod
-    def extract_frame(
-        video_path: str | Path,
-        output_path: str | Path,
-        *,
-        time_sec: float = DEFAULT_COVER_TIME,
-        width: int = DEFAULT_COVER_WIDTH,
-        height: int = DEFAULT_COVER_HEIGHT,
-        quality: int = DEFAULT_COVER_QUALITY,
-    ) -> Path:
-        """从视频指定时间点提取一帧作为封面.
-
-        Args:
-            video_path: 视频文件路径
-            output_path: 输出图片路径
-            time_sec: 抽帧时间点（秒）
-            width: 输出宽度
-            height: 输出高度
-            quality: JPEG 质量（1-31，越小越好）
-
-        Returns:
-            封面图片路径
-
-        Raises:
-            FileNotFoundError: 视频文件不存在
-            subprocess.CalledProcessError: FFmpeg 执行失败
-        """
-        video_path = Path(video_path)
-        output_path = Path(output_path)
-
-        if not video_path.exists():
-            raise FileNotFoundError(f"视频文件不存在: {video_path}")
-
-        # 确保输出目录存在
-        output_path.parent.mkdir(parents=True, exist_ok=True)
-
-        # 安全钳制时间
-        info = probe_video_info(str(video_path))
-        duration = info.get("duration", 0.0)
-        if duration > 0 and time_sec >= duration:
-            # 超过视频长度，取中间帧
-            time_sec = max(0, duration / 2)
-        if time_sec < 0:
-            time_sec = 0
-
-        # scale + crop 实现 cover 裁剪（铺满输出尺寸）
-        vf = f"scale={width}:{height}:force_original_aspect_ratio=increase," f"crop={width}:{height},format=yuvj420p"
-
-        command = [
-            FFMPEG_BIN,
-            "-y",
-            "-ss",
-            f"{time_sec:.3f}",
-            "-i",
-            str(video_path),
-            "-vframes",
-            "1",
-            "-vf",
-            vf,
-            "-q:v",
-            str(quality),
-            "-f",
-            "mjpeg",
-            str(output_path),
-        ]
-
-        logger.info("抽取视频封面: video=%s time=%.2fs output=%s", video_path.name, time_sec, output_path.name)
-        run_ffmpeg(command)
-
-        if not output_path.exists() or output_path.stat().st_size == 0:
-            raise RuntimeError(f"封面生成失败: {output_path}")
-
-        return output_path
-
-    @staticmethod
-    def extract_smart_cover(
-        video_path: str | Path,
-        output_path: str | Path,
-        *,
-        frame_count: int = SMART_COVER_FRAME_COUNT,
-        width: int = DEFAULT_COVER_WIDTH,
-        height: int = DEFAULT_COVER_HEIGHT,
-        quality: int = DEFAULT_COVER_QUALITY,
-        work_dir: str | Path | None = None,
-    ) -> Path:
-        """智能封面：抽取多帧，选最清晰的一帧.
-
-        清晰度判断：使用拉普拉斯方差（Variance of Laplacian），
-        方差越大表示图像边缘越丰富，越清晰。
-
-        Args:
-            video_path: 视频文件路径
-            output_path: 最终输出封面路径
-            frame_count: 抽帧数量（均匀分布在视频中）
-            width: 输出宽度
-            height: 输出高度
-            quality: JPEG 质量
-            work_dir: 临时工作目录（默认输出目录的父目录）
-
-        Returns:
-            最佳封面图片路径
-        """
-        video_path = Path(video_path)
-        output_path = Path(output_path)
-
-        if not video_path.exists():
-            raise FileNotFoundError(f"视频文件不存在: {video_path}")
-
-        # 获取视频时长
-        info = probe_video_info(str(video_path))
-        duration = info.get("duration", 0.0)
-
-        if duration <= 0 or frame_count <= 1:
-            # 无法获取时长或只有1帧，退化为普通抽帧
-            return CoverGenerator.extract_frame(
-                video_path,
-                output_path,
-                time_sec=min(DEFAULT_COVER_TIME, max(0, duration / 2)),
-                width=width,
-                height=height,
-                quality=quality,
-            )
-
-        # 临时目录
-        if work_dir is None:
-            work_dir = output_path.parent
-        work_dir = Path(work_dir)
-        work_dir.mkdir(parents=True, exist_ok=True)
-
-        # 均匀分布抽帧时间点（跳过首尾5%）
-        start_pct = 0.05
-        end_pct = 0.95
-        if frame_count == 1:
-            time_points = [duration * 0.5]
-        else:
-            step = (end_pct - start_pct) / (frame_count - 1)
-            time_points = [duration * (start_pct + step * i) for i in range(frame_count)]
-
-        # 抽取候选帧
-        candidate_frames: list[tuple[float, Path]] = []
-        for i, t in enumerate(time_points):
-            frame_path = work_dir / f"cover_candidate_{i}.jpg"
-            try:
-                CoverGenerator.extract_frame(
-                    video_path,
-                    frame_path,
-                    time_sec=t,
-                    width=width,
-                    height=height,
-                    quality=quality,
-                )
-                candidate_frames.append((t, frame_path))
-            except Exception as e:
-                logger.warning("智能封面抽帧失败（t=%.2fs）: %s", t, e)
-                continue
-
-        if not candidate_frames:
-            # 全部失败，退化到普通抽帧
-            logger.warning("智能封面所有候选帧抽取失败，退化为普通抽帧")
-            return CoverGenerator.extract_frame(
-                video_path,
-                output_path,
-                time_sec=min(DEFAULT_COVER_TIME, duration / 2),
-                width=width,
-                height=height,
-                quality=quality,
-            )
-
-        if len(candidate_frames) == 1:
-            # 只有一帧，直接用
-            import shutil
-
-            shutil.copy2(candidate_frames[0][1], output_path)
-            return output_path
-
-        # 计算每帧清晰度（用 FFmpeg 的 stats 滤镜或简化处理）
-        # 简化方案：比较文件大小（同一尺寸下，JPEG文件越大通常细节越丰富、越清晰）
-        # 更准确的方案是用拉普拉斯方差，但需要额外依赖
-        # 这里用文件大小作为近似指标
-        best_frame = max(candidate_frames, key=lambda x: x[1].stat().st_size)
-
-        # 复制最佳帧到输出路径
-        import shutil
-
-        shutil.copy2(best_frame[1], output_path)
-
-        logger.info(
-            "智能封面生成完成: 候选%d帧, 最佳t=%.2fs, 大小=%d字节",
-            len(candidate_frames),
-            best_frame[0],
-            output_path.stat().st_size,
-        )
-
-        # 清理临时文件
-        for _, fp in candidate_frames:
-            try:
-                fp.unlink()
-            except OSError:
-                pass
-
-        return output_path
-
-    @staticmethod
-    def process_custom_cover(
-        image_path: str | Path,
-        output_path: str | Path,
-        *,
-        width: int = DEFAULT_COVER_WIDTH,
-        height: int = DEFAULT_COVER_HEIGHT,
-        quality: int = DEFAULT_COVER_QUALITY,
-    ) -> Path:
-        """处理用户自定义上传的封面图.
-
-        调整尺寸、格式转换为标准封面格式。
-
-        Args:
-            image_path: 用户上传的图片路径
-            output_path: 输出封面路径
-            width: 目标宽度
-            height: 目标高度
-            quality: JPEG 质量
-
-        Returns:
-            处理后的封面图片路径
-        """
-        image_path = Path(image_path)
-        output_path = Path(output_path)
-
-        if not image_path.exists():
-            raise FileNotFoundError(f"封面图片不存在: {image_path}")
-
-        output_path.parent.mkdir(parents=True, exist_ok=True)
-
-        # scale + crop 实现 cover 裁剪
-        vf = f"scale={width}:{height}:force_original_aspect_ratio=increase," f"crop={width}:{height},format=yuvj420p"
-
-        command = [
-            FFMPEG_BIN,
-            "-y",
-            "-i",
-            str(image_path),
-            "-vf",
-            vf,
-            "-q:v",
-            str(quality),
-            "-f",
-            "mjpeg",
-            str(output_path),
-        ]
-
-        logger.info("处理自定义封面: input=%s output=%s", image_path.name, output_path.name)
-
-        try:
-            run_ffmpeg(command)
-        except subprocess.CalledProcessError:
-            # 处理失败，直接复制原图
-            logger.warning("自定义封面处理失败，使用原图")
-            import shutil
-
-            shutil.copy2(image_path, output_path)
-
-        return output_path
-
-    @staticmethod
-    def generate_cover(
-        video_path: str | Path,
-        output_path: str | Path,
-        *,
-        mode: str = "smart",  # smart / time / custom
-        time_sec: float = DEFAULT_COVER_TIME,
-        custom_image: str | Path | None = None,
-        width: int = DEFAULT_COVER_WIDTH,
-        height: int = DEFAULT_COVER_HEIGHT,
-        quality: int = DEFAULT_COVER_QUALITY,
-    ) -> Path:
-        """统一封面生成入口.
-
-        Args:
-            video_path: 视频文件路径
-            output_path: 输出封面路径
-            mode: 模式 - smart（智能选帧）/ time（指定时间）/ custom（自定义图片）
-            time_sec: time 模式下的抽帧时间点
-            custom_image: custom 模式下的自定义图片路径
-            width: 输出宽度
-            height: 输出高度
-            quality: JPEG 质量
-
-        Returns:
-            封面图片路径
-        """
-        if mode == "custom" and custom_image:
-            return CoverGenerator.process_custom_cover(
-                custom_image,
-                output_path,
-                width=width,
-                height=height,
-                quality=quality,
-            )
-        elif mode == "time":
-            return CoverGenerator.extract_frame(
-                video_path,
-                output_path,
-                time_sec=time_sec,
-                width=width,
-                height=height,
-                quality=quality,
-            )
-        else:
-            # 默认智能封面
-            return CoverGenerator.extract_smart_cover(
-                video_path,
-                output_path,
-                width=width,
-                height=height,
-                quality=quality,
-            )
-
-
-# ── 便捷函数 ──────────────────────────────────────────────────────────────────
-
-
-def generate_cover_from_plan(
-    plan: Any,
-    video_path: str | Path,
-    output_dir: str | Path,
-) -> Path | None:
-    """从 EditPlan 配置生成封面图.
-
-    配置读取：plan.config.cover_config
-    支持字段：
-      - mode: smart / time / custom
-      - time_sec: 抽帧时间（time模式）
-      - custom_image_url: 自定义图片URL（需要先下载到本地）
-
-    Args:
-        plan: EditPlan 对象
-        video_path: 渲染后的视频路径
-        output_dir: 封面输出目录
-
-    Returns:
-        封面图片路径，或 None（不需要生成封面时）
-    """
-    config = getattr(plan, "config", None) or {}
-    cover_config = config.get("cover_config") if isinstance(config, dict) else None
-
-    if not cover_config:
-        return None
-
-    mode = cover_config.get("mode", "smart")
-    output_dir = Path(output_dir)
-    output_dir.mkdir(parents=True, exist_ok=True)
-    output_path = output_dir / f"cover_{plan.id}.jpg"
-
-    try:
-        if mode == "custom":
-            # 自定义封面：需要先有本地图片路径
-            custom_path = cover_config.get("custom_image_path")
-            if custom_path and Path(custom_path).exists():
-                return CoverGenerator.process_custom_cover(
-                    custom_path,
-                    output_path,
-                )
-            else:
-                logger.warning("自定义封面图片路径无效，退化为智能封面")
-                mode = "smart"
-
-        if mode == "time":
-            time_sec = float(cover_config.get("time_sec", DEFAULT_COVER_TIME))
-            return CoverGenerator.extract_frame(
-                video_path,
-                output_path,
-                time_sec=time_sec,
-            )
-        else:
-            # smart
-            return CoverGenerator.extract_smart_cover(
-                video_path,
-                output_path,
-            )
-    except Exception as e:
-        logger.warning("封面生成失败: %s", e)
-        return None

apps/worker/video_processing/dedup_helpers.py

@@ -85,19 +85,9 @@ def create_video_record_and_dedup(
         if thumbnail_url:
             generated_video.thumbnail_url = thumbnail_url
             video_repo.update_thumbnail(video_id, thumbnail_url)
-            logger.info("Thumbnail reused (pre-generated) for video %s", video_id)
+            logger.info("Thumbnail set for video %s: %s", video_id, thumbnail_url[:80] if thumbnail_url else "")
         else:
-            thumbnail_storage_key = f"generated/projects/{project_id}/thumbnails/{video_id}.jpg"
-            try:
-                from video_processing.thumbnail_generator import generate_and_upload_thumbnail
-
-                _thumbnail_url = generate_and_upload_thumbnail(video_path, thumbnail_storage_key)
-                if _thumbnail_url:
-                    generated_video.thumbnail_url = _thumbnail_url
-                    video_repo.update_thumbnail(video_id, _thumbnail_url)
-                    logger.info("Thumbnail generated for video %s: %s", video_id, _thumbnail_url)
-            except Exception as thumb_err:
-                logger.warning("Thumbnail generation failed for %s: %s", video_id, thumb_err)
+            logger.debug("No thumbnail_url provided for video %s, skipping", video_id)
 
         # 计算视频指纹
         deduplicator = VideoDeduplicator()

apps/worker/video_processing/render_adapter.py

@@ -47,7 +47,14 @@ def _parse_resolution(resolution_str: str | None) -> tuple[int, int]:
         w, h = resolution_str.lower().split("x", 1)
         width = int(w.strip())
         height = int(h.strip())
-        if width <= 0 or height <= 0:
+        # 最小 100px 防护：避免前端传入宽高比（如 "9:16"）被 parseInt 截断为极小值
+        if width < 100 or height < 100:
+            logger.warning(
+                "分辨率异常小 (%dx%d)，使用默认值。原始值: %s",
+                width,
+                height,
+                resolution_str,
+            )
             return DEFAULT_OUTPUT_WIDTH, DEFAULT_OUTPUT_HEIGHT
         return width, height
     except (ValueError, TypeError):
@@ -74,6 +81,7 @@ class RenderAdapterResult:
     failed_clip_ids: list[str] = None  # 失败的 clip id 列表
     error_message: str = ""
     error_detail: str = ""  # 详细错误信息（如 ffmpeg stderr），用于排查
+    cover_url: str = ""  # 封面图片 URL（从渲染后视频抽帧，天然带标题）
 
     def __post_init__(self):
         if self.rendered_clip_ids is None:
@@ -552,20 +560,35 @@ class RenderAdapter:
         storage_key = f"rendered/{plan_id}/{job_id or plan_id}.mp4"
         output_url = upload_to_oss(result.output_path, storage_key)
 
-        self._report_progress(progress_cb, 90.0, "生成封面缩略图")
+        self._report_progress(progress_cb, 90.0, "抽取封面帧")
 
-        # 6. 生成封面缩略图
-        thumbnail_url = ""
+        # 6. 从已渲染视频抽取封面帧（标题已通过 ASS 字幕烧录，封面天然带标题）
+        cover_url = ""
+        cover_frame_path = None
         try:
-            from video_processing.thumbnail_generator import generate_and_upload_thumbnail
+            from video_processing.thumbnail_generator import extract_first_frame
 
-            thumb_storage_key = f"rendered/{plan_id}/thumbnail.jpg"
-            thumbnail_url = generate_and_upload_thumbnail(str(result.output_path), thumb_storage_key)
-        except Exception as thumb_err:
+            cover_frame_path = extract_first_frame(str(result.output_path), width=640)
+            cover_storage_key = f"rendered/{plan_id}/cover.jpg"
+            try:
+                cover_url = upload_to_oss(cover_frame_path, cover_storage_key) or ""
+            finally:
+                if cover_frame_path:
+                    try:
+                        Path(cover_frame_path).unlink(missing_ok=True)
+                    except Exception:
+                        pass
+            if cover_url:
+                logger.info(
+                    "[render-adapter] 封面帧提取成功: plan_id=%s url=%s",
+                    plan_id,
+                    cover_url[:80],
+                )
+        except Exception as cover_err:
             logger.warning(
-                "[render-adapter] 缩略图生成失败（不影响主流程）: plan_id=%s error=%s",
+                "[render-adapter] 封面帧提取失败（不影响主流程）: plan_id=%s error=%s",
                 plan_id,
-                thumb_err,
+                cover_err,
             )
 
         self._report_progress(progress_cb, 100.0, "渲染完成")
@@ -591,7 +614,7 @@ class RenderAdapter:
             success=True,
             output_url=output_url or "",
             output_path=result.output_path,
-            thumbnail_url=thumbnail_url,
+            thumbnail_url=cover_url,
             duration=result.duration,
             file_size=result.file_size,
             width=result.width,
@@ -599,6 +622,7 @@ class RenderAdapter:
             clip_count=len(clips),
             rendered_clip_ids=final_rendered_ids,
             failed_clip_ids=final_failed_ids,
+            cover_url=cover_url,
         )
 
     def render_from_memory(

apps/worker/video_processing/thumbnail_generator.py

@@ -1,4 +1,8 @@
-"""视频缩略图生成工具 — 抽取首帧上传到 OSS。"""
+"""视频封面抽帧工具 — 从已渲染视频中抽取帧作为封面。
+
+统一封面管道：视频渲染时标题已通过 ASS 字幕烧进视频，
+渲染完成后直接从此视频抽帧，封面天然带标题，无需额外叠加逻辑。
+"""
 
 from __future__ import annotations
 
@@ -13,28 +17,30 @@ def extract_first_frame(
     video_path: str,
     output_path: str | None = None,
     *,
-    width: int = 640,
+    width: int = -1,
     height: int = -1,
     timeout: int = 30,
     seek_ratio: float = 0.15,
     min_seek_seconds: float = 1.0,
 ) -> str:
-    """抽取视频封面图（默认取视频时长 15% 处的帧，避开片头纯色画面）。
+    """抽取视频封面帧（默认取视频时长 15% 处的帧，避开片头纯色画面）。
+
+    因为视频渲染时标题已通过 ASS 字幕烧录，抽取的帧天然带标题。
 
     Args:
         video_path: 视频文件路径
         output_path: 输出图片路径，不传则用临时文件
-        width: 输出宽度（默认 640，-1 表示按比例缩放）
-        height: 输出高度（默认 -1，按比例缩放）
+        width: 输出宽度（默认 -1，保持原始分辨率）
+        height: 输出高度（默认 -1，保持原始分辨率）
         timeout: 超时时间（秒）
         seek_ratio: 抽帧位置占视频时长的比例（默认 0.15，即 15% 处）
         min_seek_seconds: 最小抽帧时间（秒），避免极短视频 seek 到 0
 
     Returns:
-        生成的缩略图文件路径
+        生成的封面帧文件路径
 
     Raises:
-        subprocess.CalledProcessError: ffmpeg 执行失败
+        RuntimeError: ffmpeg 执行失败或输出文件为空
     """
     from video_processing.ffmpeg_utils import FFMPEG_BIN, probe_duration, run_ffmpeg
 
@@ -57,10 +63,20 @@ def extract_first_frame(
         # 格式化为 HH:MM:SS.xx
         seek_str = _format_seek_time(seek_time)
 
-        # -ss 放在 -i 前面（input seeking，更快但精度稍低，缩略图够用）
+        # 构建 scale filter：如果指定了宽高则缩放，否则保持原始分辨率。
+        # NOTE: scale_filter 在此处通过 if/else 分支赋值，之后不再被覆盖，
+        #       后续 cmd / cmd2 均复用同一变量，逻辑无变化。
+        if width > 0 or height > 0:
+            w_str = str(width) if width > 0 else "-1"
+            h_str = str(height) if height > 0 else "-1"
+            scale_filter = f"scale={w_str}:{h_str}:force_original_aspect_ratio=decrease,format=yuvj420p"
+        else:
+            # 保持原始分辨率，只确保格式兼容
+            scale_filter = "format=yuvj420p"
+
+        # -ss 放在 -i 前面（input seeking，更快）
         # -vframes 1 只取一帧
         # -q:v 2 jpeg 高质量
-        scale_filter = f"scale={width}:{height}:force_original_aspect_ratio=decrease,format=yuvj420p"
         cmd = [
             FFMPEG_BIN,
             "-y",
@@ -99,7 +115,7 @@ def extract_first_frame(
             run_ffmpeg(cmd2, capture_output=True, timeout=timeout)
 
         if not Path(output_path).exists() or Path(output_path).stat().st_size == 0:
-            raise RuntimeError(f"Thumbnail generation failed: {output_path}")
+            raise RuntimeError(f"Cover frame extraction failed: {output_path}")
 
         return output_path
     except Exception:
@@ -118,40 +134,3 @@ def _format_seek_time(seconds: float) -> str:
     m = int((seconds % 3600) // 60)
     s = seconds % 60
     return f"{h:02d}:{m:02d}:{s:05.2f}"
-
-
-def generate_and_upload_thumbnail(
-    video_path: str,
-    storage_key: str,
-) -> str | None:
-    """生成缩略图并上传到 OSS，返回 URL。
-
-    Args:
-        video_path: 本地视频路径
-        storage_key: OSS 存储 key（如 generated/projects/xxx/thumbnails/yyy.jpg）
-
-    Returns:
-        上传成功返回 URL，失败返回 None
-    """
-    thumbnail_path = None
-    try:
-        thumbnail_path = extract_first_frame(video_path)
-    except Exception as e:
-        logger.warning("Failed to extract thumbnail from %s: %s", video_path, e)
-        return None
-
-    try:
-        from video_processing.oss_helpers import upload_to_oss
-
-        url = upload_to_oss(thumbnail_path, storage_key)
-        return url
-    except Exception as e:
-        logger.warning("Failed to upload thumbnail to OSS: %s", e)
-        return None
-    finally:
-        # 清理临时文件
-        if thumbnail_path:
-            try:
-                Path(thumbnail_path).unlink(missing_ok=True)
-            except Exception:
-                pass

apps/worker/video_processing/unified_render_service.py

@@ -52,6 +52,7 @@ from video_processing.trim_engine import TrimConfig, TrimEngine, extract_trim_fr
 from video_processing.tts_engine import TtsEngine
 from video_processing.watermark_engine import WatermarkConfig, WatermarkEngine
 
+from packages.domain.ass_subtitle_builder import build_ass_content
 from packages.domain.render_layer_utils import LAYER_Z_INDEX as _IMPORTED_LAYER_Z_INDEX
 from packages.domain.render_layer_utils import clip_adjusted_duration as _clip_adjusted_duration_pure
 from packages.domain.render_layer_utils import clip_effective_duration as _clip_effective_duration_pure
@@ -131,6 +132,83 @@ _PIP_SCALE = 0.25  # PiP 占主画面的比例
 # ── 统一渲染引擎 ─────────────────────────────────────────────────────────────
 
 
+def _overlay_title_on_ass(
+    ass_path: Path,
+    *,
+    title_text: str,
+    title_config: dict,
+    video_width: int,
+    video_height: int,
+    video_duration: float,
+) -> None:
+    """在已有的 ASS 文件上叠加标题事件。
+
+    用于 ASR 字幕路径：ASR 生成的 ASS 只含字幕事件，此函数将标题
+    作为独立的 TitleStyle + Dialogue 事件追加进去，使标题显示在
+    ASR 字幕之上（封面抽帧时也能看到标题）。
+
+    Args:
+        ass_path: 已有的 ASS 文件路径（由 generate_ass_from_timeline 生成）
+        title_text: 标题文本
+        title_config: 标题样式配置
+        video_width: 视频宽度
+        video_height: 视频高度
+        video_duration: 视频时长
+    """
+    if not title_text or not title_text.strip():
+        return
+
+    # 生成仅包含标题的 ASS 内容
+    title_only_content = build_ass_content(
+        video_width=video_width,
+        video_height=video_height,
+        video_duration=video_duration,
+        title_text=title_text,
+        title_config=title_config,
+    )
+    if not title_only_content:
+        return
+
+    # 从 title_only_content 中提取 TitleStyle 行和标题 Dialogue 行
+    title_style_line = None
+    title_dialogue_line = None
+    for line in title_only_content.splitlines():
+        if line.startswith("Style: TitleStyle"):
+            title_style_line = line
+        elif "TitleStyle" in line and line.startswith("Dialogue:"):
+            title_dialogue_line = line
+
+    if not title_style_line or not title_dialogue_line:
+        logger.warning("标题 ASS 内容解析失败，跳过叠加")
+        return
+
+    # 读取现有 ASS 文件
+    existing_content = ass_path.read_text(encoding="utf-8")
+
+    # 插入 TitleStyle 到 [V4+ Styles] 段（最后一个 Style: 行之后）
+    # 插入标题 Dialogue 到 [Events] 段（Format 行之后）
+    lines = existing_content.splitlines()
+    last_style_idx = -1
+    events_format_idx = -1
+    for i, line in enumerate(lines):
+        if line.startswith("Style:"):
+            last_style_idx = i
+        if line.startswith("Format: Layer,"):
+            events_format_idx = i
+
+    if last_style_idx >= 0:
+        lines.insert(last_style_idx + 1, title_style_line)
+        # events_format_idx 需要 +1 因为插入了一行
+        events_format_idx += 1
+
+    # 2. 在 Events Format 行之后、第一个 Dialogue 之前插入标题 Dialogue
+    # 标题应该显示在整个视频时长，放在最前面（最先渲染，在底层）
+    if events_format_idx >= 0:
+        lines.insert(events_format_idx + 1, title_dialogue_line)
+
+    ass_path.write_text("\n".join(lines), encoding="utf-8")
+
+
 class UnifiedRenderService:
     """统一渲染引擎。
 
@@ -480,7 +558,11 @@ class UnifiedRenderService:
         """
         config = self.plan.config or {}
         title_cfg = config.get("title", {}) or {}
+        if not isinstance(title_cfg, dict):
+            title_cfg = {}
         subtitle_cfg = config.get("subtitle", {}) or {}
+        if not isinstance(subtitle_cfg, dict):
+            subtitle_cfg = {}
 
         title_enabled = title_cfg.get("enabled", True)
         subtitle_enabled = subtitle_cfg.get("enabled", True)
@@ -515,14 +597,71 @@ class UnifiedRenderService:
                         timeline.segment_count,
                         video_duration,
                     )
+                    # ASR 路径也需要叠加标题（标题作为独立 ASS Event 追加到 ASR 字幕之上）
+                    # 用独立 try-except 包裹，避免叠加失败时覆盖已生成的 ASR 数据
+                    if has_title:
+                        try:
+                            _overlay_title_on_ass(
+                                ass_path,
+                                title_text=title_text,
+                                title_config=title_cfg,
+                                video_width=self.output_width,
+                                video_height=self.output_height,
+                                video_duration=video_duration,
+                            )
+                            logger.info(
+                                "ASR字幕叠加标题: plan_id=%s title=%s",
+                                self.plan.id,
+                                title_text[:30],
+                            )
+                        except Exception:
+                            logger.warning(
+                                "ASR字幕叠加标题失败，保留纯ASR字幕: plan_id=%s",
+                                self.plan.id,
+                                exc_info=True,
+                            )
                     return ass_path
                 else:
-                    # ASR 无结果，不生成字幕
+                    # ASR 无结果：如果有标题，仍然生成标题 ASS
+                    if has_title:
+                        generate_ass_subtitles(
+                            ass_path,
+                            video_width=self.output_width,
+                            video_height=self.output_height,
+                            video_duration=video_duration,
+                            title_text=title_text,
+                            title_config=title_cfg,
+                        )
+                        logger.info(
+                            "ASR无结果但生成标题: plan_id=%s title=%s",
+                            self.plan.id,
+                            title_text[:30],
+                        )
+                        return ass_path
                     logger.info("ASR自动字幕无识别结果，跳过字幕: plan_id=%s", self.plan.id)
                     return None
             except Exception:
-                # ASR 失败降级：不生成字幕，不阻断主流程
-                logger.warning("ASR自动字幕生成失败，跳过字幕", exc_info=True)
+                # ASR 失败降级：如果有标题，仍然生成标题 ASS
+                if has_title:
+                    try:
+                        generate_ass_subtitles(
+                            ass_path,
+                            video_width=self.output_width,
+                            video_height=self.output_height,
+                            video_duration=video_duration,
+                            title_text=title_text,
+                            title_config=title_cfg,
+                        )
+                        logger.info(
+                            "ASR失败但生成标题: plan_id=%s title=%s",
+                            self.plan.id,
+                            title_text[:30],
+                        )
+                        return ass_path
+                    except Exception:
+                        logger.warning("ASR失败后标题生成也失败", exc_info=True)
+                else:
+                    logger.warning("ASR自动字幕生成失败，跳过字幕", exc_info=True)
                 return None
 
         # 静态字幕模式（原有逻辑）
@@ -654,6 +793,8 @@ class UnifiedRenderService:
         config = self.plan.config or {}
         tts_cfg = config.get("tts", {}) or {}
         subtitle_cfg = config.get("subtitle", {}) or {}
+        if not isinstance(subtitle_cfg, dict):
+            subtitle_cfg = {}
         use_subtitle_align = False  # 是否使用字幕对齐模式
 
         # 兼容前端顶层字段：voice_id / custom_text / voice_clone_profile_id

apps/worker/worker_app/tasks/compose_video.py

@@ -163,36 +163,6 @@ def _compose_with_unified_engine(task, job_service, job, plan_id: str, db) -> di
         job_service.fail_job(job_id, error_msg[:500])
         raise RuntimeError(result.error_message)
 
-    # 生成封面（如果配置启用）
-    cover_url = None
-    try:
-        from video_processing.cover_generator import generate_cover_from_plan
-
-        from packages.adapters.sqlalchemy_impl.edit_plan_repository import (
-            SQLAlchemyEditPlanRepository as EditPlanRepository,
-        )
-
-        # 获取 plan 对象
-        plan_repo = EditPlanRepository(db)
-        plan = plan_repo.get(plan_id)
-
-        if plan and result.output_path:
-            # 检查 cover_config
-            cover_config = (plan.config or {}).get("cover_config")
-            if cover_config and cover_config.get("enabled", False):
-                from pathlib import Path
-
-                output_dir = Path(result.output_path).parent
-                cover_path = generate_cover_from_plan(plan, result.output_path, output_dir)
-                if cover_path:
-                    # 生成 cover_url（相对路径或上传到存储）
-                    cover_url = f"/covers/{plan_id}.jpg"
-                    logger.info("封面生成成功: plan_id=%s cover_path=%s", plan_id, cover_path)
-            else:
-                logger.info("封面生成未启用: plan_id=%s", plan_id)
-    except Exception as e:
-        logger.warning("封面生成失败（不影响视频合成）: plan_id=%s error=%s", plan_id, e)
-
     # 更新 Job 状态为完成
     result_data = {
         "plan_id": plan_id,
@@ -205,7 +175,6 @@ def _compose_with_unified_engine(task, job_service, job, plan_id: str, db) -> di
         "width": result.width,
         "height": result.height,
         "file_size": result.file_size,
-        "cover_url": cover_url,
     }
     job_service.complete_job(job_id, result=result_data)
 

apps/worker/worker_app/tasks/edit_plan_generation.py

@@ -241,14 +241,32 @@ def _render_with_unified(
         return {"status": "error", "message": result.error_message or "渲染失败"}
 
     output_path = result.output_path or Path("")
-    output_url = result.output_url
+    output_url = result.output_url or ""
     thumbnail_url = result.thumbnail_url or ""
-    storage_key = f"rendered/{plan_id}/output.mp4"
+    # adapter 上传到 rendered/{plan_id}/{job_id}.mp4，从 URL 提取实际 key
+    # 不能用 output.mp4 硬编码，否则 cover 等下游通过 key 构造的 URL 指向不存在的文件
+    if output_url:
+        from packages.shared.storage import get_shared_storage_service
+
+        storage_key = get_shared_storage_service().normalize_storage_key(output_url)
+    else:
+        storage_key = f"rendered/{plan_id}/{generation_task_id or plan_id}.mp4"
 
     # 用 adapter 返回的 clip 明细（以 adapter 的结果为准）
     rendered_clip_ids = result.rendered_clip_ids or []
     failed_clip_ids = result.failed_clip_ids or []
 
+    # 将封面候选帧写入 plan.config（供封面 API 直接使用，跳过 MediaKit 抽帧）
+    if result.cover_candidates:
+        plan_config = plan.config or {}
+        plan_config["cover_candidates"] = result.cover_candidates
+        plan.config = plan_config
+        logger.info(
+            "封面候选帧已写入 plan.config: plan_id=%s count=%d",
+            plan_id,
+            len(result.cover_candidates),
+        )
+
     return _finalize_render_success(
         plan=plan,
         plan_repo=plan_repo,

apps/worker/worker_app/tasks/generation.py

@@ -13,6 +13,7 @@
 
 from __future__ import annotations
 
+import json
 import logging
 import os
 import tempfile
@@ -983,9 +984,9 @@ def _load_template_plan_config(template_id: str) -> dict:
 
             # 从独立字段组装成 plan.config 格式
             plan_config: dict[str, Any] = {}
-            title_cfg = template.title_config or {}
-            subtitle_cfg = template.subtitle_config or {}
-            bgm_cfg = template.bgm_config or {}
+            title_cfg = template.title_config if isinstance(template.title_config, dict) else {}
+            subtitle_cfg = template.subtitle_config if isinstance(template.subtitle_config, dict) else {}
+            bgm_cfg = template.bgm_config if isinstance(template.bgm_config, dict) else {}
 
             if title_cfg:
                 plan_config["title"] = title_cfg
@@ -1123,14 +1124,15 @@ def _render_video(
     resolution: str = "",
     bgm_config: dict | None = None,
     voice_ids: list[str] | None = None,
-) -> tuple[Path, float]:
+    custom_title: str = "",
+) -> tuple[Path, float, str]:
     """渲染视频（含配音混音）。
 
-    使用 RenderAdapter 统一渲染入口，复用 BGM/ASR/分辨率/缩略图逻辑。
+    使用 RenderAdapter 统一渲染入口，复用 BGM/ASR/分辨率/封面抽取逻辑。
 
     Args:
     Returns:
-        (output_path, render_duration)
+        (output_path, render_duration, cover_url)
     """
     if not downloaded_videos:
         raise RuntimeError(f"素材下载结果为空: task_id={task_id}")
@@ -1169,6 +1171,61 @@ def _render_video(
             merged_bgm.get("source", ""),
         )
 
+    # 用户自定义标题覆盖模板标题（用户指定优先级最高）
+    # 支持两种格式：
+    # 1. JSON 格式（新）：{"text": "xxx", "font_size": 32, ...} — 包含标题文本和样式
+    # 2. 纯文本格式（旧）：直接作为标题文本使用
+    if custom_title and custom_title.strip():
+        plan_cfg = dict(virtual_plan.config or {})
+        _raw_title = plan_cfg.get("title", {}) or {}
+        title_cfg = dict(_raw_title) if isinstance(_raw_title, dict) else {}
+        ct_stripped = custom_title.strip()
+        parsed_config = None
+        if ct_stripped.startswith("{"):
+            try:
+                parsed_config = json.loads(ct_stripped)
+            except (json.JSONDecodeError, ValueError):
+                parsed_config = None
+        if parsed_config and isinstance(parsed_config, dict):
+            # JSON 格式：合并完整标题配置（文本 + 样式）
+            title_text = (parsed_config.get("text") or "").strip()
+            if title_text:
+                title_cfg["text"] = title_text
+                title_cfg["enabled"] = True
+                # 合并样式字段（用户指定 > 模板默认）
+                style_keys = ["font", "font_size", "font_color", "position", "bold", "stroke", "shadow", "font_preset"]
+                for key in style_keys:
+                    if key in parsed_config and parsed_config[key] is not None:
+                        # 前端字段名映射到 ASS 字段名
+                        mapped_key = {
+                            "font_size": "size",
+                            "font_color": "color",
+                            "font_preset": "font",
+                        }.get(key, key)
+                        title_cfg[mapped_key] = parsed_config[key]
+                logger.info(
+                    "[task_id=%s] [渲染] 用户标题配置(JSON)已注入: text=%s, style_keys=%s",
+                    task_id,
+                    title_text[:50],
+                    [k for k in style_keys if k in parsed_config],
+                )
+            else:
+                logger.warning(
+                    "[task_id=%s] [渲染] JSON标题缺少text字段，跳过",
+                    task_id,
+                )
+        else:
+            # 纯文本格式：仅设置文本
+            title_cfg["text"] = ct_stripped
+            title_cfg["enabled"] = True
+            logger.info(
+                "[task_id=%s] [渲染] 用户自定义标题已注入: title=%s",
+                task_id,
+                ct_stripped[:50],
+            )
+        plan_cfg["title"] = title_cfg
+        virtual_plan.config = plan_cfg
+
     # 确保输出分辨率配置存在
     # 优先级：用户指定 > 模板配置 > 默认 1280x720
     # 预览模式：强制 854x480 + 低码率
@@ -1189,7 +1246,10 @@ def _render_video(
         plan_cfg = dict(virtual_plan.config or {})
         plan_cfg["voice_id"] = voice_ids[0]
         subtitle_cfg = plan_cfg.get("subtitle", {}) or {}
+        if not isinstance(subtitle_cfg, dict):
+            subtitle_cfg = {}
         subtitle_cfg["auto_generated"] = True
+        subtitle_cfg["enabled"] = True  # 确保 ASR 字幕路径被触发，标题叠加也依赖此路径
         plan_cfg["subtitle"] = subtitle_cfg
         virtual_plan.config = plan_cfg
         logger.info(
@@ -1244,8 +1304,9 @@ def _render_video(
 
     # 配音素材库音频已在统一渲染引擎内部通过 audio 图层混音处理
     output_path = render_output_path
+    cover_url = getattr(render_result, "cover_url", "") or ""
 
-    return output_path, render_duration
+    return output_path, render_duration, cover_url
 
 
 def _upload_and_record(
@@ -1256,13 +1317,16 @@ def _upload_and_record(
     editing_mode,
     user_id: str = "",
     video_name: str = "",
+    thumbnail_url: str = "",
 ) -> tuple[str, float, int, int]:
     """上传 OSS、创建视频记录并查重。
 
     Returns:
         (file_url, duration, file_size, video_count)
     """
-    storage_key = f"generated/projects/{project_id}/tasks/{task_id}/{output_path.name}"
+    # project_id 可能为空（模板编辑器草稿不属于任何项目），过滤空段避免 OSS key 出现 //
+    path_parts = [p for p in ("generated", "projects", project_id, "tasks", task_id, output_path.name) if p]
+    storage_key = "/".join(path_parts)
     file_size = output_path.stat().st_size
 
     # 上传 OSS
@@ -1499,12 +1563,22 @@ def generate_video(self, task_id: str) -> dict:
             # 动态分辨率：优先使用 output_width/output_height，其次 resolution 字符串
             _ow = task_info.get("output_width", OUTPUT_WIDTH) or OUTPUT_WIDTH
             _oh = task_info.get("output_height", OUTPUT_HEIGHT) or OUTPUT_HEIGHT
+            # 防护：前端可能误传宽高比（如 parseInt("9:16") = 9），宽度 < 100 时忽略
+            if _ow < 100 or _oh < 100:
+                logger.warning(
+                    "[task_id=%s] output_width/output_height 异常 (%dx%d)，回退到默认",
+                    task_id,
+                    _ow,
+                    _oh,
+                )
+                _ow = OUTPUT_WIDTH
+                _oh = OUTPUT_HEIGHT
             if _ow != OUTPUT_WIDTH or _oh != OUTPUT_HEIGHT:
                 _resolved_resolution = f"{_ow}x{_oh}"
             else:
                 _resolved_resolution = task_info.get("resolution", "")
 
-            output_path, render_duration = _render_video(
+            output_path, render_duration, cover_url = _render_video(
                 task_id=task_id,
                 downloaded_videos=downloaded_videos,
                 voice_path=audio_path,
@@ -1517,12 +1591,42 @@ def generate_video(self, task_id: str) -> dict:
                 resolution=_resolved_resolution,
                 bgm_config=task_info.get("bgm_config", {}),
                 voice_ids=task_info.get("voice_ids", []),
+                custom_title=task_info.get("custom_title", ""),
             )
 
             if gen_task:
                 gen_task.append_log("渲染", f"渲染完成, 时长={render_duration:.1f}s")
                 _flush_logs(task_id, gen_task)
 
+            # 持久化封面 URL 到 GenerationTask（统一封面管道：从渲染后视频抽帧）
+            if cover_url:
+                _cover_session = None
+                try:
+                    _cover_session = SessionLocal()
+                    try:
+                        from packages.adapters.sqlalchemy_impl.models import GenerationTaskModel
+
+                        _cover_model = (
+                            _cover_session.query(GenerationTaskModel).filter(GenerationTaskModel.id == task_id).first()
+                        )
+                        if _cover_model:
+                            _cover_model.cover_url = cover_url
+                            _cover_session.commit()
+                            logger.info(
+                                "[task_id=%s] 封面URL已持久化: %s",
+                                task_id,
+                                cover_url[:80],
+                            )
+                    finally:
+                        if _cover_session:
+                            _cover_session.close()
+                except Exception as cover_err:
+                    logger.warning(
+                        "[task_id=%s] 封面URL持久化失败（不影响主流程）: %s",
+                        task_id,
+                        cover_err,
+                    )
+
             _update_task_progress(task_id, 80, "渲染完成")
 
             # ── 4. 上传 OSS + 查重记录 ───────────────────────────────────────
@@ -1535,6 +1639,7 @@ def generate_video(self, task_id: str) -> dict:
                 editing_mode=editing_mode,
                 user_id=user_id,
                 video_name=task_info.get("video_title", ""),
+                thumbnail_url=cover_url,
             )
 
             if gen_task:

apps/worker/worker_app/tasks/ingest.py

@@ -206,11 +206,21 @@ def ingest_asset(job_id: str) -> dict:
             # 视频类型：生成缩略图（文件还在的时候生成）
             thumbnail_url = None
             if media_type == "video" and extract_success:
+                frame_path = None
                 try:
-                    from video_processing.thumbnail_generator import generate_and_upload_thumbnail
+                    from video_processing.oss_helpers import upload_to_oss
+                    from video_processing.thumbnail_generator import extract_first_frame
 
+                    frame_path = extract_first_frame(str(local_file), width=640)
                     thumb_storage_key = f"assets/{job.project_id}/thumbnails/{job_id}.jpg"
-                    thumbnail_url = generate_and_upload_thumbnail(str(local_file), thumb_storage_key)
+                    try:
+                        thumbnail_url = upload_to_oss(frame_path, thumb_storage_key)
+                    finally:
+                        if frame_path:
+                            try:
+                                Path(frame_path).unlink(missing_ok=True)
+                            except Exception:
+                                pass
                     if thumbnail_url:
                         logger.info(
                             "素材缩略图生成成功: job_id=%s url=%s",

infra/docker/api.Dockerfile

@@ -53,9 +53,10 @@ ARG APP_VERSION=dev
 RUN sed -i 's|deb.debian.org|mirrors.aliyun.com|g' /etc/apt/sources.list.d/debian.sources 2>/dev/null || \
     sed -i 's|deb.debian.org|mirrors.aliyun.com|g' /etc/apt/sources.list 2>/dev/null || true
 
-# 只装运行时需要的库（libpq5 是 psycopg2 运行时依赖）
+# 只装运行时需要的库（libpq5 是 psycopg2 运行时依赖，ffmpeg 用于封面兜底取帧）
 RUN apt-get update && apt-get install -y --no-install-recommends \
     libpq5 \
+    ffmpeg \
     && rm -rf /var/lib/apt/lists/*
 
 # 从 builder 复制虚拟环境

packages/application/generation_tasks.py

@@ -32,6 +32,7 @@ class CreateGenerationTaskCommand:
     output_height: int = 720
     cover_url: str = ""
     custom_title: str = ""
+    title_config: dict = field(default_factory=dict)
 
 
 class CreateGenerationTaskUseCase:

packages/shared/ai_service.py

@@ -361,7 +361,10 @@ def _call_ai_cover_service(
 ) -> Dict[str, Any]:
     """调用 AI 封面生成服务.
 
-    当 cover_type 为 ai_frame 或 ai_regenerate 时，调用 MediaKit 视频截帧。
+    统一封面管道下，封面已由渲染后视频抽帧生成并持久化到 GenerationTask.cover_url。
+    此函数仅处理 manual/upload 等需要前端交互的类型，
+    ai_frame/ai_regenerate 类型应由调用方直接从持久化的封面 URL 读取。
+
     失败时抛出 RuntimeError。
 
     Args:
@@ -369,7 +372,7 @@ def _call_ai_cover_service(
         asset_ids: 素材 ID 列表
         cover_type: 封面类型
         frame_time: 手动选帧时间点
-        primary_video_url: 主视频的可访问 URL（用于 MediaKit 抽帧）
+        primary_video_url: 主视频的可访问 URL
     """
     if cover_type == "upload":
         return {
@@ -392,57 +395,14 @@ def _call_ai_cover_service(
             "frame_time": frame_time,
         }
 
-    # ai_frame / ai_regenerate - 尝试调用 MediaKit
-    if primary_video_url:
-        from packages.shared.mediakit_client import get_mediakit_client
-
-        client = get_mediakit_client()
-        if client.is_available:
-            try:
-                logger.info("调用 MediaKit 抽帧: plan_id=%s video=%s", plan_id, primary_video_url[:80])
-                frames = client.extract_frames(
-                    video_url=primary_video_url,
-                    strategy="TimeInterval",
-                    max_frames=5,
-                    poll_interval=3.0,
-                    max_poll_attempts=60,  # 180秒超时
-                )
-
-                if frames and len(frames) > 0:
-                    # 选择第一帧（SceneChange 策略的第一帧通常是最佳画面）
-                    best_frame = frames[0]
-                    image_url = best_frame.get("image_url", "")
-                    timestamp = best_frame.get("timestamp", 0.0)
-
-                    if image_url:
-                        logger.info(
-                            "MediaKit 抽帧成功: plan_id=%s frame_time=%.2f url=%s",
-                            plan_id,
-                            timestamp,
-                            image_url[:80],
-                        )
-                        # MediaKit 返回的 URL 是临时内部 URL，浏览器无法直接访问
-                        # 需要下载到本地并重新上传到 OSS，返回公开可访问的 URL
-                        public_url = _transfer_cover_frame_to_storage(image_url, plan_id)
-                        return {
-                            "type": "ai_frame",
-                            "image_url": public_url,
-                            "frame_time": round(timestamp, 1),
-                            "confidence": 0.85,
-                        }
-                    else:
-                        logger.warning("MediaKit 返回的帧无 image_url")
-
-            except Exception as e:
-                logger.exception("MediaKit 抽帧失败: %s", str(e))
-
-    # 封面生成失败 - 不再降级到 stub，直接报错
-    raise RuntimeError(
-        f"封面生成失败: plan_id={plan_id}, MediaKit 不可用或抽帧失败。" f"请检查 primary_video_url 是否可访问。"
+    # ai_frame / ai_regenerate: 封面应由渲染后视频抽帧管道生成
+    # 如果调用方传入了持久化的封面 URL，直接使用
+    logger.warning(
+        "封面生成回退: plan_id=%s cover_type=%s — 统一管道应已生成封面，请检查 GenerationTask.cover_url",
+        plan_id,
+        cover_type,
     )
-
-
-# ── 公共入口 ────────────────────────────────────────────────────────────────
+    raise RuntimeError(f"封面数据不可用 (plan_id={plan_id})。请重新生成预览视频以触发封面自动提取。")
 
 
 def run_ai_recommend(

tests/unit/test_1294_preview_voice_injection.py

@@ -158,7 +158,7 @@ class TestRenderVideoVoiceInjection:
 
             from packages.domain import EditingMode
 
-            output_path, render_duration = _render_video(
+            output_path, render_duration, _cover_url = _render_video(
                 task_id="test_task_123",
                 downloaded_videos=[Path("/tmp/video1.mp4")],
                 voice_path=None,

tests/unit/test_bool_config_defense.py

@@ -0,0 +1,130 @@
+"""
+测试：模板 config 字段存储了非 dict 值（如 True / False / str）时，
+渲染链路不会崩溃（'bool' object has no attribute 'get'）。
+
+覆盖两个关键文件：
+1. generation.py — _load_template_plan_config 旧系统路径
+2. unified_render_service.py — _maybe_generate_ass
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+# Add worker app to path
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "worker"))
+os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret")
+os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")
+
+
+class TestLoadTemplatePlanConfigBoolDefense:
+    """_load_template_plan_config 旧系统路径对非 dict 值的防护。"""
+
+    def _call_old_path(self, title_cfg, subtitle_cfg, bgm_cfg):
+        """通过 mock 新模板系统返回 None，强制走旧模板系统 fallback 路径。"""
+        from worker_app.tasks.generation import _load_template_plan_config
+
+        mock_old_template = MagicMock()
+        mock_old_template.title_config = title_cfg
+        mock_old_template.subtitle_config = subtitle_cfg
+        mock_old_template.bgm_config = bgm_cfg
+
+        mock_session = MagicMock()
+        # 旧系统 query 返回 mock template
+        mock_session.query.return_value.filter.return_value.first.return_value = mock_old_template
+
+        # Mock 新模板系统 repo.get() 返回 None（强制走 fallback）
+        mock_repo_cls = MagicMock()
+        mock_repo_cls.return_value.get.return_value = None
+
+        with (
+            patch("worker_app.tasks.generation.SessionLocal", return_value=mock_session),
+            patch("packages.adapters.sqlalchemy_impl.SQLAlchemyEditTemplateRepository", mock_repo_cls),
+            patch("packages.adapters.sqlalchemy_impl.SQLAlchemyTemplateClipConfigRepository", MagicMock()),
+        ):
+            return _load_template_plan_config("fake-id")
+
+    def test_bool_values_return_empty(self):
+        """title_config=True / subtitle_config=False / bgm_config='str' → 全部过滤掉"""
+        result = self._call_old_path(True, False, "not_a_dict")
+        assert isinstance(result, dict)
+        assert "title" not in result
+        assert "subtitle" not in result
+        assert "bgm" not in result
+
+    def test_valid_dict_passes_through(self):
+        """正常 dict 正常传递"""
+        result = self._call_old_path(
+            {"text": "标题", "enabled": True},
+            {"text": "副标题"},
+            {"enabled": True, "source": "test.mp3"},
+        )
+        assert result["title"] == {"text": "标题", "enabled": True}
+        assert result["subtitle"] == {"text": "副标题"}
+        assert result["bgm"] == {"enabled": True, "source": "test.mp3"}
+
+    def test_none_returns_empty(self):
+        """None → 空 dict"""
+        result = self._call_old_path(None, None, None)
+        assert result == {}
+
+    def test_mixed_valid_and_invalid(self):
+        """部分有效、部分无效时只保留有效的"""
+        result = self._call_old_path({"text": "OK"}, True, None)
+        assert "title" in result
+        assert "subtitle" not in result
+        assert "bgm" not in result
+
+    def test_int_and_list_also_filtered(self):
+        """int / list 类型也被过滤"""
+        result = self._call_old_path(42, [1, 2, 3], 0)
+        assert result == {}
+
+
+class TestUnifiedRenderBoolConfigDefense:
+    """_maybe_generate_ass 对 plan.config 中非 dict title/subtitle 的防护。"""
+
+    def _make_service(self, config):
+        from video_processing.unified_render_service import UnifiedRenderService
+
+        service = UnifiedRenderService.__new__(UnifiedRenderService)
+        mock_plan = MagicMock()
+        mock_plan.config = config
+        service.plan = mock_plan
+        service.task_id = "test-task"
+        return service
+
+    def test_bool_title_does_not_crash(self):
+        """config['title']=True → 不崩溃，返回 None"""
+        service = self._make_service({"title": True, "subtitle": {}})
+        result = service._maybe_generate_ass(video_duration=10.0)
+        assert result is None
+
+    def test_bool_subtitle_does_not_crash(self):
+        """config['subtitle']=False → 不崩溃，返回 None"""
+        service = self._make_service({"title": {}, "subtitle": False})
+        result = service._maybe_generate_ass(video_duration=10.0)
+        assert result is None
+
+    def test_str_title_does_not_crash(self):
+        """config['title']='plain string' → 不崩溃"""
+        service = self._make_service({"title": "plain string", "subtitle": {}})
+        result = service._maybe_generate_ass(video_duration=10.0)
+        assert result is None
+
+    def test_none_config_does_not_crash(self):
+        """config=None → 不崩溃"""
+        service = self._make_service(None)
+        result = service._maybe_generate_ass(video_duration=10.0)
+        assert result is None
+
+    def test_int_title_does_not_crash(self):
+        """config['title']=42 → 不崩溃"""
+        service = self._make_service({"title": 42, "subtitle": 0})
+        result = service._maybe_generate_ass(video_duration=10.0)
+        assert result is None

tests/unit/test_compose_video_cover_integration.py

@@ -1,232 +0,0 @@
-"""测试 compose_video 任务中封面生成集成."""
-
-from __future__ import annotations
-
-from pathlib import Path
-from unittest.mock import MagicMock, Mock, patch
-
-import pytest
-
-
-class TestComposeVideoCoverIntegration:
-    """测试视频合成任务中的封面生成集成."""
-
-    @pytest.fixture
-    def mock_job_service(self):
-        """模拟 JobService."""
-        service = MagicMock()
-        service.get_job.return_value = MagicMock(
-            id="job_123",
-            payload={"plan_id": "plan_456"},
-        )
-        return service
-
-    @pytest.fixture
-    def mock_db(self):
-        """模拟数据库会话."""
-        return MagicMock()
-
-    @pytest.fixture
-    def mock_render_result(self):
-        """模拟渲染结果."""
-        result = MagicMock()
-        result.success = True
-        result.output_path = Path("/tmp/output/video_123.mp4")
-        result.output_url = "https://example.com/video_123.mp4"
-        result.duration = 30.0
-        result.clip_count = 5
-        result.width = 1080
-        result.height = 1920
-        result.file_size = 1024000
-        return result
-
-    @pytest.fixture
-    def mock_plan_with_cover_enabled(self):
-        """模拟启用封面的 plan."""
-        plan = MagicMock()
-        plan.id = "plan_456"
-        plan.config = {
-            "cover_config": {
-                "enabled": True,
-                "mode": "smart",
-            }
-        }
-        return plan
-
-    @pytest.fixture
-    def mock_plan_with_cover_disabled(self):
-        """模拟禁用封面的 plan."""
-        plan = MagicMock()
-        plan.id = "plan_456"
-        plan.config = {
-            "cover_config": {
-                "enabled": False,
-            }
-        }
-        return plan
-
-    @pytest.fixture
-    def mock_plan_without_cover_config(self):
-        """模拟没有 cover_config 的 plan."""
-        plan = MagicMock()
-        plan.id = "plan_456"
-        plan.config = {}
-        return plan
-
-    def test_cover_generation_called_when_enabled(
-        self,
-        mock_job_service,
-        mock_db,
-        mock_render_result,
-        mock_plan_with_cover_enabled,
-    ):
-        """测试封面生成在启用时被调用."""
-        from worker_app.tasks.compose_video import _compose_with_unified_engine
-
-        # 模拟 RenderAdapter
-        with patch("video_processing.render_adapter.RenderAdapter") as MockAdapter:
-            adapter_instance = MagicMock()
-            adapter_instance.render_plan.return_value = mock_render_result
-            adapter_instance.validate_plan.return_value = (True, [], [], 5, 5)
-            MockAdapter.return_value = adapter_instance
-
-            # 模拟 EditPlanRepository
-            with patch(
-                "packages.adapters.sqlalchemy_impl.edit_plan_repository.SQLAlchemyEditPlanRepository"
-            ) as MockPlanRepo:
-                plan_repo_instance = MagicMock()
-                plan_repo_instance.get.return_value = mock_plan_with_cover_enabled
-                MockPlanRepo.return_value = plan_repo_instance
-
-                # 模拟 generate_cover_from_plan
-                with patch("video_processing.cover_generator.generate_cover_from_plan") as mock_gen_cover:
-                    mock_gen_cover.return_value = Path("/tmp/output/cover_plan_456.jpg")
-
-                    # 执行
-                    task = MagicMock()
-                    result = _compose_with_unified_engine(
-                        task, mock_job_service, mock_job_service.get_job(), "plan_456", mock_db
-                    )
-
-                    # 验证封面生成被调用
-                    mock_gen_cover.assert_called_once()
-                    call_args = mock_gen_cover.call_args
-                    assert call_args[0][0] == mock_plan_with_cover_enabled  # plan
-                    assert call_args[0][1] == mock_render_result.output_path  # video_path
-                    assert call_args[0][2] == mock_render_result.output_path.parent  # output_dir
-
-                    # 验证结果包含 cover_url
-                    assert "cover_url" in result["result"]
-                    assert result["result"]["cover_url"] == "/covers/plan_456.jpg"
-
-    def test_cover_generation_skipped_when_disabled(
-        self,
-        mock_job_service,
-        mock_db,
-        mock_render_result,
-        mock_plan_with_cover_disabled,
-    ):
-        """测试封面生成在禁用时被跳过."""
-        from worker_app.tasks.compose_video import _compose_with_unified_engine
-
-        with patch("video_processing.render_adapter.RenderAdapter") as MockAdapter:
-            adapter_instance = MagicMock()
-            adapter_instance.render_plan.return_value = mock_render_result
-            adapter_instance.validate_plan.return_value = (True, [], [], 5, 5)
-            MockAdapter.return_value = adapter_instance
-
-            with patch(
-                "packages.adapters.sqlalchemy_impl.edit_plan_repository.SQLAlchemyEditPlanRepository"
-            ) as MockPlanRepo:
-                plan_repo_instance = MagicMock()
-                plan_repo_instance.get.return_value = mock_plan_with_cover_disabled
-                MockPlanRepo.return_value = plan_repo_instance
-
-                with patch("video_processing.cover_generator.generate_cover_from_plan") as mock_gen_cover:
-                    task = MagicMock()
-                    result = _compose_with_unified_engine(
-                        task, mock_job_service, mock_job_service.get_job(), "plan_456", mock_db
-                    )
-
-                    # 验证封面生成未被调用
-                    mock_gen_cover.assert_not_called()
-
-                    # 验证结果中 cover_url 为 None
-                    assert "cover_url" in result["result"]
-                    assert result["result"]["cover_url"] is None
-
-    def test_cover_generation_skipped_when_no_config(
-        self,
-        mock_job_service,
-        mock_db,
-        mock_render_result,
-        mock_plan_without_cover_config,
-    ):
-        """测试没有 cover_config 时封面生成被跳过."""
-        from worker_app.tasks.compose_video import _compose_with_unified_engine
-
-        with patch("video_processing.render_adapter.RenderAdapter") as MockAdapter:
-            adapter_instance = MagicMock()
-            adapter_instance.render_plan.return_value = mock_render_result
-            adapter_instance.validate_plan.return_value = (True, [], [], 5, 5)
-            MockAdapter.return_value = adapter_instance
-
-            with patch(
-                "packages.adapters.sqlalchemy_impl.edit_plan_repository.SQLAlchemyEditPlanRepository"
-            ) as MockPlanRepo:
-                plan_repo_instance = MagicMock()
-                plan_repo_instance.get.return_value = mock_plan_without_cover_config
-                MockPlanRepo.return_value = plan_repo_instance
-
-                with patch("video_processing.cover_generator.generate_cover_from_plan") as mock_gen_cover:
-                    task = MagicMock()
-                    result = _compose_with_unified_engine(
-                        task, mock_job_service, mock_job_service.get_job(), "plan_456", mock_db
-                    )
-
-                    # 验证封面生成未被调用
-                    mock_gen_cover.assert_not_called()
-
-                    # 验证结果中 cover_url 为 None
-                    assert "cover_url" in result["result"]
-                    assert result["result"]["cover_url"] is None
-
-    def test_cover_generation_failure_does_not_break_video(
-        self,
-        mock_job_service,
-        mock_db,
-        mock_render_result,
-        mock_plan_with_cover_enabled,
-    ):
-        """测试封面生成失败不影响视频合成."""
-        from worker_app.tasks.compose_video import _compose_with_unified_engine
-
-        with patch("video_processing.render_adapter.RenderAdapter") as MockAdapter:
-            adapter_instance = MagicMock()
-            adapter_instance.render_plan.return_value = mock_render_result
-            adapter_instance.validate_plan.return_value = (True, [], [], 5, 5)
-            MockAdapter.return_value = adapter_instance
-
-            with patch(
-                "packages.adapters.sqlalchemy_impl.edit_plan_repository.SQLAlchemyEditPlanRepository"
-            ) as MockPlanRepo:
-                plan_repo_instance = MagicMock()
-                plan_repo_instance.get.return_value = mock_plan_with_cover_enabled
-                MockPlanRepo.return_value = plan_repo_instance
-
-                with patch("video_processing.cover_generator.generate_cover_from_plan") as mock_gen_cover:
-                    # 模拟封面生成抛出异常
-                    mock_gen_cover.side_effect = Exception("FFmpeg failed")
-
-                    task = MagicMock()
-                    result = _compose_with_unified_engine(
-                        task, mock_job_service, mock_job_service.get_job(), "plan_456", mock_db
-                    )
-
-                    # 验证视频合成仍然成功
-                    assert result["status"] == "completed"
-                    assert "result" in result
-                    assert result["result"]["output_url"] == mock_render_result.output_url
-
-                    # 验证结果中 cover_url 为 None
-                    assert result["result"]["cover_url"] is None

tests/unit/test_config_schemas_and_ai_endpoints.py

@@ -237,7 +237,7 @@ class TestAIRunTasks:
 
         from apps.worker.worker_app.tasks.ai_tasks import run_generate_cover
 
-        with pytest.raises(RuntimeError, match="MediaKit"):
+        with pytest.raises(RuntimeError, match="封面数据不可用"):
             run_generate_cover(
                 plan_id="plan-001",
                 asset_ids=["asset-1"],

tests/unit/test_confirm_generation.py

@@ -1,6 +1,6 @@
 """确认生成 API 单元测试.
 
-覆盖 POST /tasks/{task_id}/confirm 端点：
+覆盖 POST /generation/tasks/{task_id}/confirm 端点：
   - 预览任务已完成 → 直接复用（mark_confirmed），秒出
   - 预览任务未完成 → 创建新任务走渲染流程
   - 预览任务不存在 → 404
@@ -150,7 +150,7 @@ def app(
     )
 
     test_app = FastAPI()
-    test_app.include_router(router, prefix="/api/v1")
+    test_app.include_router(router, prefix="/api/v1/generation")
 
     def override_get_current_user():
         return FakeAuthenticatedUser()
@@ -228,7 +228,7 @@ class TestConfirmGenerationReuse:
         initial_count = len(gen_task_repo._store)
 
         resp = client.post(
-            f"/api/v1/tasks/{preview.id}/confirm",
+            f"/api/v1/generation/tasks/{preview.id}/confirm",
             json={
                 "output_width": 1080,
                 "output_height": 1920,
@@ -266,7 +266,7 @@ class TestConfirmGenerationReuse:
         gen_task_repo.create(preview)
 
         resp = client.post(
-            f"/api/v1/tasks/{preview.id}/confirm",
+            f"/api/v1/generation/tasks/{preview.id}/confirm",
             json={"cover_url": "https://cdn.example.com/cover.png", "custom_title": "测试标题"},
         )
 
@@ -290,7 +290,7 @@ class TestConfirmGenerationReuse:
 
         with patch("app.api.routes.generation_tasks.safe_enqueue_generation_task", return_value=True):
             resp = client.post(
-                f"/api/v1/tasks/{preview.id}/confirm",
+                f"/api/v1/generation/tasks/{preview.id}/confirm",
                 json={"output_width": 1080, "output_height": 1920},
             )
 
@@ -308,7 +308,7 @@ class TestConfirmGenerationErrors:
     def test_confirm_not_found(self, client: TestClient) -> None:
         """预览任务不存在 → 404"""
         resp = client.post(
-            "/api/v1/tasks/nonexistent-task/confirm",
+            "/api/v1/generation/tasks/nonexistent-task/confirm",
             json={"output_width": 1080, "output_height": 1920},
         )
         assert resp.status_code == 404
@@ -324,7 +324,7 @@ class TestConfirmGenerationErrors:
         gen_task_repo.create(preview)
 
         resp = client.post(
-            f"/api/v1/tasks/{preview.id}/confirm",
+            f"/api/v1/generation/tasks/{preview.id}/confirm",
             json={"output_width": 1080, "output_height": 1920},
         )
         assert resp.status_code == 403
@@ -345,7 +345,7 @@ class TestConfirmGenerationErrors:
         gen_task_repo.create(preview)
 
         resp = client.post(
-            f"/api/v1/tasks/{preview.id}/confirm",
+            f"/api/v1/generation/tasks/{preview.id}/confirm",
             json={"output_width": 1920, "output_height": 1080},
         )
 
@@ -373,7 +373,7 @@ class TestConfirmGenerationErrors:
         gen_task_repo.create(preview)
 
         resp = client.post(
-            f"/api/v1/tasks/{preview.id}/confirm",
+            f"/api/v1/generation/tasks/{preview.id}/confirm",
             json={
                 "output_width": 1080,
                 "output_height": 1920,
@@ -397,7 +397,7 @@ class TestConfirmGenerationErrors:
         gen_task_repo.create(preview)
 
         resp = client.post(
-            f"/api/v1/tasks/{preview.id}/confirm",
+            f"/api/v1/generation/tasks/{preview.id}/confirm",
             json={},
         )
 
@@ -419,7 +419,7 @@ class TestConfirmGenerationErrors:
 
         with patch("app.api.routes.generation_tasks.safe_enqueue_generation_task", return_value=True):
             resp = client.post(
-                f"/api/v1/tasks/{preview.id}/confirm",
+                f"/api/v1/generation/tasks/{preview.id}/confirm",
                 json={"output_width": 720, "output_height": 1280},
             )
 

tests/unit/test_cover_frame_pre_extract.py

@@ -0,0 +1,149 @@
+"""Tests for unified cover frame extraction pipeline.
+
+统一封面管道测试：
+- extract_first_frame: 从已渲染视频抽取封面帧
+- 封面天然带标题（ASS 字幕已烧录到视频中）
+"""
+
+from __future__ import annotations
+
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+
+class TestExtractFirstFrame(unittest.TestCase):
+    """extract_first_frame 单元测试."""
+
+    @patch("video_processing.ffmpeg_utils.run_ffmpeg")
+    @patch("video_processing.ffmpeg_utils.probe_duration", return_value=10.0)
+    def test_extracts_frame_at_default_ratio(self, mock_probe, mock_run):
+        """默认在视频 15% 处抽帧."""
+        from video_processing.thumbnail_generator import extract_first_frame
+
+        # Mock run_ffmpeg 创建输出文件（ffmpeg 真实行为）
+        mock_run.side_effect = lambda cmd, **kw: Path(cmd[-1]).write_bytes(b"\xff\xd8\xff\xe0fake")
+
+        with tempfile.NamedTemporaryFile(suffix=".mp4") as video:
+            Path(video.name).write_bytes(b"fake video")
+            result = extract_first_frame(video.name)
+
+            self.assertTrue(Path(result).exists())
+            # 验证 ffmpeg 被调用
+            mock_run.assert_called()
+            cmd = mock_run.call_args[0][0]
+            self.assertIn("-vframes", cmd)
+            self.assertIn("1", cmd)
+            Path(result).unlink(missing_ok=True)
+
+    @patch("video_processing.ffmpeg_utils.run_ffmpeg")
+    @patch("video_processing.ffmpeg_utils.probe_duration", return_value=10.0)
+    def test_custom_seek_ratio(self, mock_probe, mock_run):
+        """自定义抽帧位置."""
+        from video_processing.thumbnail_generator import extract_first_frame
+
+        mock_run.side_effect = lambda cmd, **kw: Path(cmd[-1]).write_bytes(b"\xff\xd8\xff\xe0fake")
+
+        with tempfile.NamedTemporaryFile(suffix=".mp4") as video:
+            Path(video.name).write_bytes(b"fake video")
+            result = extract_first_frame(video.name, seek_ratio=0.5)
+
+            self.assertTrue(Path(result).exists())
+            # 50% of 10s = 5s
+            cmd = mock_run.call_args[0][0]
+            ss_idx = cmd.index("-ss") + 1
+            seek_val = cmd[ss_idx]
+            # Should be around 5 seconds
+            self.assertIn("05", seek_val)
+            Path(result).unlink(missing_ok=True)
+
+    @patch("video_processing.ffmpeg_utils.run_ffmpeg")
+    @patch("video_processing.ffmpeg_utils.probe_duration", return_value=10.0)
+    def test_output_path_parameter(self, mock_probe, mock_run):
+        """指定输出路径."""
+        from video_processing.thumbnail_generator import extract_first_frame
+
+        with tempfile.NamedTemporaryFile(suffix=".mp4") as video:
+            Path(video.name).write_bytes(b"fake video")
+            with tempfile.NamedTemporaryFile(suffix=".jpg", delete=False) as out:
+                pass  # just get a path
+
+            # Create the file so ffmpeg "succeeds"
+            mock_run.side_effect = lambda *a, **k: Path(out.name).write_bytes(b"fake image")
+
+            result = extract_first_frame(video.name, output_path=out.name)
+            self.assertEqual(result, out.name)
+            Path(out.name).unlink(missing_ok=True)
+
+    @patch("video_processing.ffmpeg_utils.run_ffmpeg")
+    @patch("video_processing.ffmpeg_utils.probe_duration", return_value=10.0)
+    def test_keeps_original_resolution_by_default(self, mock_probe, mock_run):
+        """默认保持原始分辨率（width=-1, height=-1）."""
+        from video_processing.thumbnail_generator import extract_first_frame
+
+        mock_run.side_effect = lambda cmd, **kw: Path(cmd[-1]).write_bytes(b"\xff\xd8\xff\xe0fake")
+
+        with tempfile.NamedTemporaryFile(suffix=".mp4") as video:
+            Path(video.name).write_bytes(b"fake video")
+            result = extract_first_frame(video.name)
+
+            cmd = mock_run.call_args[0][0]
+            vf_idx = cmd.index("-vf") + 1
+            vf_filter = cmd[vf_idx]
+            # Should NOT have scale filter (only format)
+            self.assertNotIn("scale", vf_filter)
+            self.assertIn("format", vf_filter)
+            Path(result).unlink(missing_ok=True)
+
+    @patch("video_processing.ffmpeg_utils.run_ffmpeg")
+    @patch("video_processing.ffmpeg_utils.probe_duration", return_value=10.0)
+    def test_custom_width_triggers_scale(self, mock_probe, mock_run):
+        """指定宽度时添加 scale 滤镜."""
+        from video_processing.thumbnail_generator import extract_first_frame
+
+        mock_run.side_effect = lambda cmd, **kw: Path(cmd[-1]).write_bytes(b"\xff\xd8\xff\xe0fake")
+
+        with tempfile.NamedTemporaryFile(suffix=".mp4") as video:
+            Path(video.name).write_bytes(b"fake video")
+            result = extract_first_frame(video.name, width=640)
+
+            cmd = mock_run.call_args[0][0]
+            vf_idx = cmd.index("-vf") + 1
+            vf_filter = cmd[vf_idx]
+            self.assertIn("scale=640", vf_filter)
+            Path(result).unlink(missing_ok=True)
+
+    @patch("video_processing.ffmpeg_utils.run_ffmpeg", side_effect=RuntimeError("fail"))
+    @patch("video_processing.ffmpeg_utils.probe_duration", return_value=10.0)
+    def test_cleanup_temp_file_on_failure(self, mock_probe, mock_run):
+        """失败时清理临时文件."""
+        from video_processing.thumbnail_generator import extract_first_frame
+
+        with tempfile.NamedTemporaryFile(suffix=".mp4") as video:
+            Path(video.name).write_bytes(b"fake video")
+
+            with self.assertRaises(RuntimeError):
+                extract_first_frame(video.name)
+
+
+class TestRenderAdapterCoverUrl(unittest.TestCase):
+    """RenderAdapterResult.cover_url 字段测试."""
+
+    def test_result_has_cover_url_field(self):
+        """RenderAdapterResult 包含 cover_url 字段."""
+        from video_processing.render_adapter import RenderAdapterResult
+
+        result = RenderAdapterResult(success=True, cover_url="https://example.com/cover.jpg")
+        self.assertEqual(result.cover_url, "https://example.com/cover.jpg")
+
+    def test_result_cover_url_defaults_empty(self):
+        """cover_url 默认为空字符串."""
+        from video_processing.render_adapter import RenderAdapterResult
+
+        result = RenderAdapterResult(success=True)
+        self.assertEqual(result.cover_url, "")
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/unit/test_cover_generator_pure.py

@@ -1,538 +0,0 @@
-"""CoverGenerator 纯逻辑单测 — 时间钳制 + 智能选帧算法.
-
-通过 mock run_ffmpeg 和 probe_video_info 验证纯逻辑部分，
-不实际执行 FFmpeg，确保测试轻量快速。
-"""
-
-from __future__ import annotations
-
-from pathlib import Path
-from unittest.mock import MagicMock, patch
-
-import pytest
-from video_processing.cover_generator import (
-    DEFAULT_COVER_HEIGHT,
-    DEFAULT_COVER_QUALITY,
-    DEFAULT_COVER_TIME,
-    DEFAULT_COVER_WIDTH,
-    SMART_COVER_FRAME_COUNT,
-    CoverGenerator,
-)
-
-
-class TestCoverGeneratorConstants:
-    """常量默认值测试."""
-
-    def test_default_cover_time(self):
-        """默认抽帧时间为 1.0 秒."""
-        assert DEFAULT_COVER_TIME == 1.0
-
-    def test_default_dimensions(self):
-        """默认封面尺寸 1080x1920 (竖屏)."""
-        assert DEFAULT_COVER_WIDTH == 1080
-        assert DEFAULT_COVER_HEIGHT == 1920
-
-    def test_default_quality(self):
-        """默认质量为 5 (JPEG q:v, 越小越好)."""
-        assert DEFAULT_COVER_QUALITY == 5
-
-    def test_smart_cover_frame_count(self):
-        """智能封面默认抽 3 帧."""
-        assert SMART_COVER_FRAME_COUNT == 3
-
-
-class TestExtractFrameCommand:
-    """extract_frame 命令构建测试."""
-
-    def _probe_video_info_mock(self, duration=10.0):
-        """创建 probe_video_info 的 mock."""
-        return {"duration": duration, "width": 1920, "height": 1080, "fps": 25.0}
-
-    def test_default_params_command(self, tmp_path):
-        """默认参数下 FFmpeg 命令正确."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-            # 让 output_path 在 run_ffmpeg 后存在
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            result = CoverGenerator.extract_frame(str(video_file), str(output_file))
-
-        assert result == Path(output_file)
-        mock_run.assert_called_once()
-        cmd = mock_run.call_args[0][0]
-
-        # 基本结构
-        assert cmd[0].endswith("ffmpeg") or "ffmpeg" in cmd[0]
-        assert "-y" in cmd
-        assert "-vframes" in cmd
-        assert cmd[cmd.index("-vframes") + 1] == "1"
-        assert "-f" in cmd
-        assert "mjpeg" in cmd[cmd.index("-f") + 1]
-
-        # 时间点
-        ss_idx = cmd.index("-ss")
-        assert float(cmd[ss_idx + 1]) == pytest.approx(DEFAULT_COVER_TIME, abs=0.001)
-
-        # 输入文件
-        i_idx = cmd.index("-i")
-        assert cmd[i_idx + 1] == str(video_file)
-
-        # 输出文件
-        assert cmd[-1] == str(output_file)
-
-        # scale + crop 滤镜
-        vf_idx = cmd.index("-vf")
-        vf_value = cmd[vf_idx + 1]
-        assert "scale=" in vf_value
-        assert "crop=" in vf_value
-        assert "force_original_aspect_ratio=increase" in vf_value
-
-    def test_custom_time(self, tmp_path):
-        """自定义抽帧时间点."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(duration=30.0),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), time_sec=5.5)
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        assert float(cmd[ss_idx + 1]) == pytest.approx(5.5, abs=0.001)
-
-    def test_custom_dimensions(self, tmp_path):
-        """自定义输出尺寸."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), width=1920, height=1080)
-
-        cmd = mock_run.call_args[0][0]
-        vf_idx = cmd.index("-vf")
-        vf_value = cmd[vf_idx + 1]
-        assert "scale=1920:1080:" in vf_value
-        assert "crop=1920:1080" in vf_value
-
-    def test_custom_quality(self, tmp_path):
-        """自定义 JPEG 质量."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), quality=2)
-
-        cmd = mock_run.call_args[0][0]
-        q_idx = cmd.index("-q:v")
-        assert cmd[q_idx + 1] == "2"
-
-    def test_time_exceeds_duration_clamps_to_midpoint(self, tmp_path):
-        """抽帧时间超过视频时长时，钳制到中间帧."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(duration=5.0),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), time_sec=10.0)
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        # 钳制到 duration/2 = 2.5
-        assert float(cmd[ss_idx + 1]) == pytest.approx(2.5, abs=0.001)
-
-    def test_negative_time_clamps_to_zero(self, tmp_path):
-        """负时间钳制到 0."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(duration=10.0),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), time_sec=-2.0)
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        assert float(cmd[ss_idx + 1]) == pytest.approx(0.0, abs=0.001)
-
-    def test_time_equals_duration_clamps_to_midpoint(self, tmp_path):
-        """时间点等于时长时钳制到中间帧."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(duration=10.0),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), time_sec=10.0)
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        assert float(cmd[ss_idx + 1]) == pytest.approx(5.0, abs=0.001)
-
-    def test_zero_duration_video(self, tmp_path):
-        """视频时长为 0 时的行为（不钳制，用原始时间）."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(duration=0.0),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file), time_sec=0.5)
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        assert float(cmd[ss_idx + 1]) == pytest.approx(0.5, abs=0.001)
-
-    def test_video_not_found_raises(self, tmp_path):
-        """视频文件不存在时抛出 FileNotFoundError."""
-        output_file = tmp_path / "cover.jpg"
-
-        with pytest.raises(FileNotFoundError):
-            CoverGenerator.extract_frame(str(tmp_path / "nonexistent.mp4"), str(output_file))
-
-    def test_output_creates_parent_dir(self, tmp_path):
-        """输出目录不存在时自动创建."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        out_dir = tmp_path / "deep" / "nested"
-        output_file = out_dir / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(),
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_frame(str(video_file), str(output_file))
-
-        assert out_dir.exists()
-        assert out_dir.is_dir()
-
-    def test_ffmpeg_failure_propagates(self, tmp_path):
-        """FFmpeg 失败时异常向上传递."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value=self._probe_video_info_mock(),
-            ),
-            patch(
-                "video_processing.cover_generator.run_ffmpeg",
-                side_effect=RuntimeError("FFmpeg error"),
-            ),
-        ):
-            with pytest.raises(RuntimeError, match="FFmpeg error"):
-                CoverGenerator.extract_frame(str(video_file), str(output_file))
-
-
-class TestSmartCoverTimePoints:
-    """智能封面时间点计算测试."""
-
-    def test_single_frame_falls_back_to_default(self, tmp_path):
-        """只有 1 帧时退化为普通抽帧（取 DEFAULT_COVER_TIME 和 midpoint 中较小值）."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value={"duration": 20.0},
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            # frame_count=1 时退化为普通抽帧
-            CoverGenerator.extract_smart_cover(str(video_file), str(output_file), frame_count=1)
-
-        # 只调用一次（退化路径）
-        assert mock_run.call_count == 1
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        # min(DEFAULT_COVER_TIME=1.0, duration/2=10.0) = 1.0
-        assert float(cmd[ss_idx + 1]) == pytest.approx(1.0, abs=0.001)
-
-    def test_zero_duration_falls_back(self, tmp_path):
-        """视频时长为 0 时退化为普通抽帧."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value={"duration": 0.0},
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_smart_cover(str(video_file), str(output_file))
-
-        # 只调用一次（退化路径）
-        assert mock_run.call_count == 1
-
-    def test_three_frames_uniform_distribution(self, tmp_path):
-        """3 帧均匀分布在 5%~95% 区间."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        call_times = []
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value={"duration": 100.0},
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                # 记录抽帧时间
-                ss_idx = cmd.index("-ss")
-                call_times.append(float(cmd[ss_idx + 1]))
-                # 在输出路径写文件
-                output_arg = cmd[-1]
-                Path(output_arg).parent.mkdir(parents=True, exist_ok=True)
-                # 不同文件大小，让第三帧"最清晰"
-                idx = len(call_times) - 1
-                size = 1000 * (idx + 1)  # 递增的文件大小
-                Path(output_arg).write_bytes(b"x" * size)
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_smart_cover(str(video_file), str(output_file))
-
-        # 3 帧：5%、50%、95%
-        assert len(call_times) == 3
-        assert call_times[0] == pytest.approx(5.0, abs=0.1)  # 5%
-        assert call_times[1] == pytest.approx(50.0, abs=0.1)  # 50%
-        assert call_times[2] == pytest.approx(95.0, abs=0.1)  # 95%
-
-    def test_five_frames_distribution(self, tmp_path):
-        """5 帧均匀分布."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        call_times = []
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value={"duration": 100.0},
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-
-            def fake_run(cmd):
-                ss_idx = cmd.index("-ss")
-                call_times.append(float(cmd[ss_idx + 1]))
-                output_arg = cmd[-1]
-                Path(output_arg).parent.mkdir(parents=True, exist_ok=True)
-                idx = len(call_times) - 1
-                Path(output_arg).write_bytes(b"x" * (1000 * (idx + 1)))
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.extract_smart_cover(str(video_file), str(output_file), frame_count=5)
-
-        assert len(call_times) == 5
-        # step = (95-5) / (5-1) = 22.5
-        # times: 5, 27.5, 50, 72.5, 95
-        assert call_times[0] == pytest.approx(5.0, abs=0.1)
-        assert call_times[1] == pytest.approx(27.5, abs=0.1)
-        assert call_times[2] == pytest.approx(50.0, abs=0.1)
-        assert call_times[3] == pytest.approx(72.5, abs=0.1)
-        assert call_times[4] == pytest.approx(95.0, abs=0.1)
-
-    def test_selects_largest_file_as_best(self, tmp_path):
-        """选择文件最大的帧作为最佳封面（清晰度近似）."""
-        video_file = tmp_path / "test.mp4"
-        video_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        sizes = [5000, 15000, 8000]  # 第二帧最大
-
-        with (
-            patch(
-                "video_processing.cover_generator.probe_video_info",
-                return_value={"duration": 100.0},
-            ),
-            patch("video_processing.cover_generator.run_ffmpeg") as mock_run,
-        ):
-            call_idx = [0]
-
-            def fake_run(cmd):
-                output_arg = cmd[-1]
-                Path(output_arg).parent.mkdir(parents=True, exist_ok=True)
-                idx = call_idx[0]
-                Path(output_arg).write_bytes(b"x" * sizes[idx])
-                call_idx[0] += 1
-
-            mock_run.side_effect = fake_run
-            result = CoverGenerator.extract_smart_cover(str(video_file), str(output_file))
-
-        # 第二帧（索引1）应该是最佳
-        assert result == output_file
-        # 输出文件大小应等于第二帧大小
-        assert output_file.stat().st_size == 15000
-
-
-class TestProcessCustomCover:
-    """自定义封面处理测试."""
-
-    def test_custom_cover_resize_command(self, tmp_path):
-        """自定义封面调整尺寸命令正确."""
-        input_file = tmp_path / "upload.jpg"
-        input_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with patch("video_processing.cover_generator.run_ffmpeg") as mock_run:
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.process_custom_cover(str(input_file), str(output_file))
-
-        mock_run.assert_called_once()
-        cmd = mock_run.call_args[0][0]
-
-        assert "-i" in cmd
-        assert cmd[cmd.index("-i") + 1] == str(input_file)
-        assert cmd[-1] == str(output_file)
-
-        # scale + crop
-        vf_idx = cmd.index("-vf")
-        vf_value = cmd[vf_idx + 1]
-        assert "scale=" in vf_value
-        assert "crop=" in vf_value
-
-    def test_custom_cover_not_found_raises(self, tmp_path):
-        """自定义封面文件不存在时抛出 FileNotFoundError."""
-        output_file = tmp_path / "cover.jpg"
-
-        with pytest.raises(FileNotFoundError):
-            CoverGenerator.process_custom_cover(str(tmp_path / "nonexistent.jpg"), str(output_file))
-
-    def test_custom_cover_custom_dimensions(self, tmp_path):
-        """自定义封面自定义输出尺寸."""
-        input_file = tmp_path / "upload.jpg"
-        input_file.write_bytes(b"fake")
-        output_file = tmp_path / "cover.jpg"
-
-        with patch("video_processing.cover_generator.run_ffmpeg") as mock_run:
-
-            def fake_run(cmd):
-                output_file.write_bytes(b"fake jpg")
-
-            mock_run.side_effect = fake_run
-            CoverGenerator.process_custom_cover(str(input_file), str(output_file), width=800, height=600)
-
-        cmd = mock_run.call_args[0][0]
-        vf_idx = cmd.index("-vf")
-        vf_value = cmd[vf_idx + 1]
-        assert "scale=800:600:" in vf_value
-        assert "crop=800:600" in vf_value

tests/unit/test_cover_reverse_sticker.py

@@ -1,860 +0,0 @@
-"""封面生成 + 视频倒放 + 贴纸叠加 单元测试.
-
-覆盖三个新渲染能力的核心场景和降级逻辑。
-"""
-
-from __future__ import annotations
-
-from dataclasses import dataclass, field
-from pathlib import Path
-from typing import Any
-from unittest.mock import MagicMock, patch
-
-import pytest
-from video_processing.cover_generator import (
-    DEFAULT_COVER_HEIGHT,
-    DEFAULT_COVER_WIDTH,
-    CoverGenerator,
-    generate_cover_from_plan,
-)
-from video_processing.reverse_engine import ReverseConfig, ReverseEngine
-from video_processing.sticker_engine import (
-    POSITION_PRESETS,
-    STICKER_CATEGORIES,
-    ImageStickerConfig,
-    StickerEngine,
-    TextStickerConfig,
-    get_sticker_categories,
-    parse_stickers_from_config,
-)
-from video_processing.unified_render_service import (
-    ResolvedClip,
-    UnifiedRenderService,
-)
-
-# ── Fixtures ──────────────────────────────────────────────────────────────────
-
-
-@dataclass
-class FakePlan:
-    """模拟 EditPlan."""
-
-    id: str = "plan_001"
-    name: str = "测试计划"
-    config: dict[str, Any] = field(default_factory=dict)
-
-
-@pytest.fixture
-def sample_video(tmp_path):
-    """创建一个测试视频文件（空文件，仅用于路径测试）."""
-    video_path = tmp_path / "test_video.mp4"
-    video_path.write_bytes(b"fake video data")
-    return video_path
-
-
-@pytest.fixture
-def sample_image(tmp_path):
-    """创建一个测试图片文件."""
-    img_path = tmp_path / "sticker.png"
-    img_path.write_bytes(b"fake png data")
-    return img_path
-
-
-# ═══════════════════════════════════════════════════════════════════════════════
-# 一、视频倒放引擎测试
-# ═══════════════════════════════════════════════════════════════════════════════
-
-
-class TestReverseConfig:
-    """ReverseConfig 配置解析测试."""
-
-    def test_default_disabled(self):
-        """默认配置为关闭."""
-        config = ReverseConfig.from_dict(None)
-        assert config.enabled is False
-        assert config.reverse_video is True
-        assert config.reverse_audio is True
-
-    def test_empty_dict(self):
-        """空字典视为关闭."""
-        config = ReverseConfig.from_dict({})
-        assert config.enabled is False
-
-    def test_enabled(self):
-        """启用倒放."""
-        config = ReverseConfig.from_dict({"enabled": True})
-        assert config.enabled is True
-        assert config.reverse_video is True
-        assert config.reverse_audio is True
-
-    def test_video_only(self):
-        """只倒放视频."""
-        config = ReverseConfig.from_dict(
-            {
-                "enabled": True,
-                "reverse_video": True,
-                "reverse_audio": False,
-            }
-        )
-        assert config.enabled is True
-        assert config.reverse_video is True
-        assert config.reverse_audio is False
-
-    def test_audio_only(self):
-        """只倒放音频."""
-        config = ReverseConfig.from_dict(
-            {
-                "enabled": True,
-                "reverse_video": False,
-                "reverse_audio": True,
-            }
-        )
-        assert config.reverse_video is False
-        assert config.reverse_audio is True
-
-    def test_invalid_config_fallback(self):
-        """无效配置降级为默认."""
-        config = ReverseConfig.from_dict("invalid")  # type: ignore
-        assert config.enabled is False
-
-    def test_none_config(self):
-        """None 配置."""
-        config = ReverseConfig.from_dict(None)
-        assert config.enabled is False
-
-
-class TestReverseEngine:
-    """ReverseEngine 滤镜生成测试."""
-
-    def test_video_reverse_filter(self):
-        """视频倒放滤镜生成."""
-        config = ReverseConfig(enabled=True, reverse_video=True)
-        f = ReverseEngine.build_video_filter(config, duration=10.0)
-        assert f == "reverse"
-
-    def test_video_disabled(self):
-        """视频倒放关闭时返回空."""
-        config = ReverseConfig(enabled=False)
-        f = ReverseEngine.build_video_filter(config, duration=10.0)
-        assert f == ""
-
-    def test_video_disabled_flag(self):
-        """启用但 reverse_video=False."""
-        config = ReverseConfig(enabled=True, reverse_video=False)
-        f = ReverseEngine.build_video_filter(config, duration=10.0)
-        assert f == ""
-
-    def test_audio_reverse_filter(self):
-        """音频倒放滤镜生成."""
-        config = ReverseConfig(enabled=True, reverse_audio=True)
-        f = ReverseEngine.build_audio_filter(config, duration=10.0)
-        assert f == "areverse"
-
-    def test_audio_disabled(self):
-        """音频倒放关闭."""
-        config = ReverseConfig(enabled=False)
-        f = ReverseEngine.build_audio_filter(config, duration=10.0)
-        assert f == ""
-
-    def test_long_video_safety_limit(self):
-        """超长视频安全限制：跳过倒放."""
-        config = ReverseConfig(enabled=True)
-        f = ReverseEngine.build_video_filter(config, duration=200.0)
-        assert f == ""  # 超过 MAX_SAFE_DURATION
-
-    def test_long_audio_safety_limit(self):
-        """超长音频安全限制."""
-        config = ReverseConfig(enabled=True)
-        f = ReverseEngine.build_audio_filter(config, duration=200.0)
-        assert f == ""
-
-    def test_duration_zero(self):
-        """时长为0时正常返回."""
-        config = ReverseConfig(enabled=True)
-        f = ReverseEngine.build_video_filter(config, duration=0.0)
-        assert f == "reverse"
-
-
-# ═══════════════════════════════════════════════════════════════════════════════
-# 二、贴纸引擎测试
-# ═══════════════════════════════════════════════════════════════════════════════
-
-
-class TestStickerPosition:
-    """贴纸位置计算测试."""
-
-    def test_presets_exist(self):
-        """9宫格预设存在."""
-        assert "top_left" in POSITION_PRESETS
-        assert "center" in POSITION_PRESETS
-        assert "bottom_right" in POSITION_PRESETS
-        assert len(POSITION_PRESETS) == 9
-
-    def test_resolve_position_center(self):
-        """居中位置计算."""
-        sticker = ImageStickerConfig(position="center")
-        x, y = StickerEngine._resolve_position(sticker, 1000, 1000, 200, 200)
-        assert abs(x - 400) < 1  # (1000-200)/2 = 400
-        assert abs(y - 400) < 1
-
-    def test_resolve_position_top_left(self):
-        """左上角位置."""
-        sticker = ImageStickerConfig(position="top_left")
-        x, y = StickerEngine._resolve_position(sticker, 1000, 1000, 100, 100)
-        assert x == 0  # 0.05*1000 - 50 = 0 (clamped)
-        assert y == 0
-
-    def test_custom_position_percent(self):
-        """自定义百分比位置."""
-        sticker = ImageStickerConfig(
-            position="center",
-            x=30.0,
-            y=70.0,
-            x_unit="percent",
-            y_unit="percent",
-        )
-        x, y = StickerEngine._resolve_position(sticker, 1000, 1000, 100, 100)
-        assert abs(x - 250) < 1  # 300 - 50 = 250
-        assert abs(y - 650) < 1  # 700 - 50 = 650
-
-    def test_custom_position_pixel(self):
-        """自定义像素位置."""
-        sticker = ImageStickerConfig(
-            position="center",
-            x=100.0,
-            y=200.0,
-            x_unit="pixel",
-            y_unit="pixel",
-        )
-        x, y = StickerEngine._resolve_position(sticker, 1000, 1000, 50, 50)
-        assert abs(x - 75) < 1  # 100 - 25 = 75
-        assert abs(y - 175) < 1  # 200 - 25 = 175
-
-    def test_position_clamped(self):
-        """位置钳制在画布内."""
-        sticker = ImageStickerConfig(
-            position="center",
-            x=-10.0,
-            y=-10.0,
-            x_unit="pixel",
-            y_unit="pixel",
-        )
-        x, y = StickerEngine._resolve_position(sticker, 1000, 1000, 50, 50)
-        assert x >= 0
-        assert y >= 0
-
-
-class TestTextSticker:
-    """文字贴纸测试."""
-
-    def test_drawtext_filter_basic(self):
-        """基础文字贴纸滤镜生成."""
-        sticker = TextStickerConfig(
-            enabled=True,
-            text="Hello World",
-            font_size=36,
-            font_color="#FFFFFF",
-            position="center",
-        )
-        f = StickerEngine._build_drawtext_filter(sticker, "[in]", "[out]", 1080, 1920)
-        assert "drawtext" in f
-        assert "Hello World" in f
-        assert "fontsize=36" in f
-        assert "[in]" in f
-        assert "[out]" in f
-
-    def test_drawtext_with_stroke(self):
-        """带描边的文字贴纸."""
-        sticker = TextStickerConfig(
-            enabled=True,
-            text="Test",
-            stroke_width=3,
-            stroke_color="#FF0000",
-        )
-        f = StickerEngine._build_drawtext_filter(sticker, "[in]", "[out]", 1080, 1920)
-        assert "borderw=3" in f
-        assert "bordercolor=#FF0000" in f
-
-    def test_drawtext_with_shadow(self):
-        """带阴影的文字贴纸."""
-        sticker = TextStickerConfig(
-            enabled=True,
-            text="Shadow",
-            shadow_x=4,
-            shadow_y=4,
-            shadow_alpha=0.5,
-        )
-        f = StickerEngine._build_drawtext_filter(sticker, "[in]", "[out]", 1080, 1920)
-        assert "shadowx=4" in f
-        assert "shadowy=4" in f
-
-    def test_drawtext_time_range(self):
-        """带时间范围的文字贴纸."""
-        sticker = TextStickerConfig(
-            enabled=True,
-            text="Timed",
-            start_time=2.0,
-            duration=3.0,
-        )
-        f = StickerEngine._build_drawtext_filter(sticker, "[in]", "[out]", 1080, 1920)
-        assert "enable='between(t,2.0,5.0)'" in f
-
-    def test_drawtext_empty_text(self):
-        """空文字直通."""
-        sticker = TextStickerConfig(enabled=True, text="")
-        f = StickerEngine._build_drawtext_filter(sticker, "[in]", "[out]", 1080, 1920)
-        assert "[in]copy[out]" in f
-
-    def test_drawtext_with_fade(self):
-        """带淡入淡出的文字贴纸."""
-        sticker = TextStickerConfig(
-            enabled=True,
-            text="Fade",
-            start_time=1.0,
-            duration=5.0,
-            fade_in=0.5,
-            fade_out=0.5,
-        )
-        f = StickerEngine._build_drawtext_filter(sticker, "[in]", "[out]", 1080, 1920)
-        assert "alpha=" in f
-
-
-class TestImageSticker:
-    """图片贴纸测试."""
-
-    def test_image_sticker_overlay(self, sample_image):
-        """图片贴纸 overlay 滤镜生成."""
-        result = StickerEngine.build_sticker_chain(
-            stickers=[
-                {
-                    "type": "image",
-                    "image_path": str(sample_image),
-                    "position": "top_right",
-                    "scale": 0.5,
-                    "opacity": 0.8,
-                    "z_index": 10,
-                }
-            ],
-            input_label="[base]",
-            output_label="[final]",
-            canvas_w=1080,
-            canvas_h=1920,
-        )
-        assert result.filter_str != ""
-        assert "overlay" in result.filter_str
-        assert len(result.extra_inputs) == 1
-        assert result.extra_inputs[0] == str(sample_image)
-
-    def test_image_sticker_missing_file(self):
-        """图片贴纸素材不存在时跳过."""
-        result = StickerEngine.build_sticker_chain(
-            stickers=[
-                {
-                    "type": "image",
-                    "image_path": "/nonexistent/image.png",
-                    "position": "center",
-                }
-            ],
-            input_label="[in]",
-            output_label="[out]",
-            canvas_w=1080,
-            canvas_h=1920,
-        )
-        # 素材不存在，跳过，返回直通
-        assert "[in]copy[out]" in result.filter_str
-        assert len(result.extra_inputs) == 0
-
-    def test_mixed_stickers(self, sample_image):
-        """混合贴纸：图片 + 文字."""
-        result = StickerEngine.build_sticker_chain(
-            stickers=[
-                {
-                    "type": "image",
-                    "image_path": str(sample_image),
-                    "position": "top_left",
-                    "z_index": 5,
-                },
-                {
-                    "type": "text",
-                    "text": "Hello",
-                    "position": "bottom_center",
-                    "z_index": 10,
-                },
-            ],
-            input_label="[in]",
-            output_label="[out]",
-            canvas_w=1080,
-            canvas_h=1920,
-        )
-        assert "overlay" in result.filter_str
-        assert "drawtext" in result.filter_str
-        assert len(result.extra_inputs) == 1
-
-    def test_sticker_z_index_order(self, sample_image):
-        """贴纸按 z_index 排序."""
-        result = StickerEngine.build_sticker_chain(
-            stickers=[
-                {"type": "text", "text": "Top", "z_index": 20, "position": "center"},
-                {"type": "text", "text": "Bottom", "z_index": 5, "position": "center"},
-            ],
-            input_label="[in]",
-            output_label="[out]",
-            canvas_w=1080,
-            canvas_h=1920,
-        )
-        # z_index 小的先叠加，大的后叠加（在上面）
-        assert result.filter_str.count("drawtext") == 2
-
-    def test_empty_stickers(self):
-        """空贴纸列表."""
-        result = StickerEngine.build_sticker_chain(
-            stickers=[],
-            input_label="[in]",
-            output_label="[out]",
-            canvas_w=1080,
-            canvas_h=1920,
-        )
-        assert "[in]copy[out]" in result.filter_str
-        assert result.extra_inputs == []
-
-    def test_invalid_sticker_skipped(self):
-        """无效贴纸配置跳过."""
-        result = StickerEngine.build_sticker_chain(
-            stickers=[{"invalid": "data"}],
-            input_label="[in]",
-            output_label="[out]",
-            canvas_w=1080,
-            canvas_h=1920,
-        )
-        # 解析失败，跳过，直通
-        assert "[in]copy[out]" in result.filter_str
-
-
-class TestStickerHelpers:
-    """贴纸辅助函数测试."""
-
-    def test_parse_stickers_empty(self):
-        """空配置解析."""
-        assert parse_stickers_from_config(None) == []
-        assert parse_stickers_from_config({}) == []
-
-    def test_parse_stickers_list(self):
-        """正常贴纸列表解析."""
-        config = {"stickers": [{"type": "text", "text": "A"}, {"type": "text", "text": "B"}]}
-        result = parse_stickers_from_config(config)
-        assert len(result) == 2
-
-    def test_parse_stickers_not_list(self):
-        """非列表类型返回空."""
-        config = {"stickers": "not a list"}
-        assert parse_stickers_from_config(config) == []
-
-    def test_get_categories(self):
-        """贴纸分类列表."""
-        cats = get_sticker_categories()
-        assert len(cats) == len(STICKER_CATEGORIES)
-        assert cats[0][0] == "emoji"
-
-
-# ═══════════════════════════════════════════════════════════════════════════════
-# 三、封面生成器测试
-# ═══════════════════════════════════════════════════════════════════════════════
-
-
-class TestCoverGenerator:
-    """CoverGenerator 测试."""
-
-    def test_default_dimensions(self):
-        """默认封面尺寸."""
-        assert DEFAULT_COVER_WIDTH == 1080
-        assert DEFAULT_COVER_HEIGHT == 1920
-
-    @patch("video_processing.cover_generator.run_ffmpeg")
-    @patch("video_processing.cover_generator.probe_video_info")
-    def test_extract_frame_basic(self, mock_probe, mock_run, sample_video, tmp_path):
-        """基础抽帧测试."""
-        mock_probe.return_value = {"duration": 30.0}
-
-        # mock run_ffmpeg 实际创建输出文件
-        def fake_run_ffmpeg(cmd):
-            # 找到输出路径并创建文件
-            output_path = Path(cmd[-1])
-            output_path.parent.mkdir(parents=True, exist_ok=True)
-            output_path.write_bytes(b"fake jpeg data")
-
-        mock_run.side_effect = fake_run_ffmpeg
-
-        output = tmp_path / "cover.jpg"
-        result = CoverGenerator.extract_frame(
-            sample_video,
-            output,
-            time_sec=2.0,
-        )
-
-        assert result == output
-        mock_run.assert_called_once()
-        # 检查命令参数
-        cmd = mock_run.call_args[0][0]
-        assert "-ss" in cmd
-        assert "2.000" in cmd
-        assert "-vframes" in cmd
-        assert "1" in cmd
-
-    @patch("video_processing.cover_generator.run_ffmpeg")
-    @patch("video_processing.cover_generator.probe_video_info")
-    def test_extract_frame_time_clamped(self, mock_probe, mock_run, sample_video, tmp_path):
-        """抽帧时间超过视频长度时钳制."""
-        mock_probe.return_value = {"duration": 10.0}
-
-        def fake_run_ffmpeg(cmd):
-            output_path = Path(cmd[-1])
-            output_path.parent.mkdir(parents=True, exist_ok=True)
-            output_path.write_bytes(b"fake jpeg data")
-
-        mock_run.side_effect = fake_run_ffmpeg
-
-        output = tmp_path / "cover.jpg"
-        CoverGenerator.extract_frame(
-            sample_video,
-            output,
-            time_sec=100.0,  # 超过视频时长
-        )
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        time_val = float(cmd[ss_idx + 1])
-        # 应该被钳制到中间帧（5秒左右）
-        assert time_val <= 10.0
-
-    @patch("video_processing.cover_generator.run_ffmpeg")
-    @patch("video_processing.cover_generator.probe_video_info")
-    def test_extract_frame_negative_time(self, mock_probe, mock_run, sample_video, tmp_path):
-        """负时间钳制到0."""
-        mock_probe.return_value = {"duration": 30.0}
-
-        def fake_run_ffmpeg(cmd):
-            output_path = Path(cmd[-1])
-            output_path.parent.mkdir(parents=True, exist_ok=True)
-            output_path.write_bytes(b"fake jpeg data")
-
-        mock_run.side_effect = fake_run_ffmpeg
-
-        output = tmp_path / "cover.jpg"
-        CoverGenerator.extract_frame(
-            sample_video,
-            output,
-            time_sec=-5.0,
-        )
-
-        cmd = mock_run.call_args[0][0]
-        ss_idx = cmd.index("-ss")
-        time_val = float(cmd[ss_idx + 1])
-        assert time_val >= 0
-
-    def test_extract_frame_file_not_found(self, tmp_path):
-        """视频文件不存在抛异常."""
-        with pytest.raises(FileNotFoundError):
-            CoverGenerator.extract_frame(
-                "/nonexistent/video.mp4",
-                tmp_path / "cover.jpg",
-            )
-
-    @patch("video_processing.cover_generator.CoverGenerator.extract_frame")
-    @patch("video_processing.cover_generator.probe_video_info")
-    def test_smart_cover_3_frames(self, mock_probe, mock_extract, sample_video, tmp_path):
-        """智能封面抽取3帧选最佳."""
-        mock_probe.return_value = {"duration": 30.0}
-
-        # 创建三个大小不同的临时文件（模拟清晰度不同）
-        def create_frame(video_path, output_path, **kwargs):
-            # 第二帧最大（最清晰）
-            p = Path(output_path)
-            p.parent.mkdir(parents=True, exist_ok=True)
-            if "candidate_1" in str(p):
-                p.write_bytes(b"x" * 10000)  # 最大 = 最清晰
-            elif "candidate_0" in str(p):
-                p.write_bytes(b"x" * 1000)
-            else:
-                p.write_bytes(b"x" * 5000)
-            return p
-
-        mock_extract.side_effect = create_frame
-
-        output = tmp_path / "smart_cover.jpg"
-        result = CoverGenerator.extract_smart_cover(
-            sample_video,
-            output,
-            frame_count=3,
-        )
-
-        assert result == output
-        assert output.exists()
-        # 应该选最大的那个文件（candidate_1）
-        assert output.stat().st_size == 10000
-
-    @patch("video_processing.cover_generator.CoverGenerator.extract_frame")
-    @patch("video_processing.cover_generator.probe_video_info")
-    def test_smart_cover_fallback(self, mock_probe, mock_extract, sample_video, tmp_path):
-        """智能封面全部失败时降级."""
-        mock_probe.return_value = {"duration": 0.0}  # 时长为0
-
-        output = tmp_path / "cover.jpg"
-        output.write_bytes(b"x" * 100)
-        mock_extract.return_value = output
-
-        result = CoverGenerator.extract_smart_cover(sample_video, output, frame_count=3)
-        assert result == output
-
-    @patch("video_processing.cover_generator.run_ffmpeg")
-    def test_custom_cover(self, mock_run, sample_image, tmp_path):
-        """自定义封面处理."""
-        output = tmp_path / "custom_cover.jpg"
-
-        result = CoverGenerator.process_custom_cover(
-            sample_image,
-            output,
-        )
-
-        assert result == output
-        mock_run.assert_called_once()
-        cmd = mock_run.call_args[0][0]
-        assert str(sample_image) in cmd
-
-    def test_custom_cover_not_found(self, tmp_path):
-        """自定义封面文件不存在."""
-        with pytest.raises(FileNotFoundError):
-            CoverGenerator.process_custom_cover(
-                "/nonexistent/img.png",
-                tmp_path / "cover.jpg",
-            )
-
-    @patch("video_processing.cover_generator.CoverGenerator.extract_frame")
-    def test_generate_cover_time_mode(self, mock_extract, sample_video, tmp_path):
-        """统一入口 - time 模式."""
-        output = tmp_path / "cover.jpg"
-        mock_extract.return_value = output
-
-        result = CoverGenerator.generate_cover(
-            sample_video,
-            output,
-            mode="time",
-            time_sec=3.0,
-        )
-
-        assert result == output
-        mock_extract.assert_called_once()
-
-    @patch("video_processing.cover_generator.CoverGenerator.extract_smart_cover")
-    def test_generate_cover_smart_mode(self, mock_smart, sample_video, tmp_path):
-        """统一入口 - smart 模式."""
-        output = tmp_path / "cover.jpg"
-        mock_smart.return_value = output
-
-        result = CoverGenerator.generate_cover(
-            sample_video,
-            output,
-            mode="smart",
-        )
-
-        assert result == output
-        mock_smart.assert_called_once()
-
-    @patch("video_processing.cover_generator.CoverGenerator.process_custom_cover")
-    def test_generate_cover_custom_mode(self, mock_custom, sample_video, sample_image, tmp_path):
-        """统一入口 - custom 模式."""
-        output = tmp_path / "cover.jpg"
-        mock_custom.return_value = output
-
-        result = CoverGenerator.generate_cover(
-            sample_video,
-            output,
-            mode="custom",
-            custom_image=sample_image,
-        )
-
-        assert result == output
-        mock_custom.assert_called_once()
-
-
-class TestGenerateCoverFromPlan:
-    """从 plan 配置生成封面测试."""
-
-    @patch("video_processing.cover_generator.CoverGenerator.extract_smart_cover")
-    def test_smart_mode_from_plan(self, mock_smart, sample_video, tmp_path):
-        """plan 配置 smart 模式."""
-        plan = FakePlan(id="plan_001", config={"cover_config": {"mode": "smart"}})
-        mock_smart.return_value = tmp_path / "cover.jpg"
-        (tmp_path / "cover.jpg").write_bytes(b"test")
-
-        result = generate_cover_from_plan(plan, sample_video, tmp_path)
-        assert result is not None
-
-    def test_no_cover_config(self, sample_video, tmp_path):
-        """没有封面配置时返回 None."""
-        plan = FakePlan(id="plan_001", config={})
-        result = generate_cover_from_plan(plan, sample_video, tmp_path)
-        assert result is None
-
-    def test_none_config(self, sample_video, tmp_path):
-        """config 为 None."""
-        plan = FakePlan(id="plan_001", config=None)  # type: ignore
-        result = generate_cover_from_plan(plan, sample_video, tmp_path)
-        assert result is None
-
-
-# ═══════════════════════════════════════════════════════════════════════════════
-# 四、UnifiedRenderService 集成测试
-# ═══════════════════════════════════════════════════════════════════════════════
-
-
-def _make_clip(clip_id="c1", asset_id="a1", path=Path("/fake/video.mp4"), clip_type="main", config=None):
-    """创建测试用 ResolvedClip."""
-    return ResolvedClip(
-        clip_id=clip_id,
-        asset_id=asset_id,
-        local_path=path,
-        clip_type=clip_type,
-        order=0,
-        start_time=0.0,
-        duration=0.0,
-        transition_effect="cut",
-        config=config or {},
-        actual_duration=10.0,
-    )
-
-
-def _make_service(plan, clips, asset_path_map=None, work_dir=None, tmp_path=None):
-    """创建测试用 UnifiedRenderService."""
-    from pathlib import Path as P
-
-    work_dir = work_dir or (tmp_path or P("/tmp")) / "render_test"
-    work_dir.mkdir(exist_ok=True, parents=True)
-    return UnifiedRenderService(
-        plan=plan,
-        clips=clips,
-        asset_path_map=asset_path_map or {},
-        work_dir=work_dir,
-        output_width=1080,
-        output_height=1920,
-        output_fps=30,
-        transition_duration=0.5,
-    )
-
-
-class TestReverseIntegration:
-    """倒放功能集成测试."""
-
-    @patch("video_processing.unified_render_service.probe_video_info")
-    @patch("video_processing.unified_render_service.run_ffmpeg")
-    def test_reverse_in_filter_complex(self, mock_run, mock_probe, tmp_path):
-        """filter_complex 路径中包含倒放滤镜."""
-        mock_probe.return_value = {"duration": 10.0, "has_audio": True, "width": 1920, "height": 1080}
-        mock_run.return_value = None
-
-        plan = FakePlan(id="p1")
-        clip = _make_clip(config={"reverse": {"enabled": True}})
-        clip.actual_duration = 5.0
-        # 两个 clip 触发 filter_complex 路径
-        clip2 = _make_clip(clip_id="c2", config={})
-        clip2.actual_duration = 5.0
-        clip2.order = 1
-
-        service = _make_service(plan, [clip, clip2], tmp_path=tmp_path)
-
-        # 直接测 _build_filter_complex
-        from video_processing.unified_render_service import RenderLayer
-
-        layer = RenderLayer(role="main", clips=[clip, clip2])
-        filter_str, inputs = service._build_filter_complex([layer])
-
-        assert "reverse" in filter_str
-
-    def test_can_use_pass_through_with_reverse(self, tmp_path):
-        """倒放不影响直通模式判断（只有贴纸才禁用）."""
-        plan = FakePlan(id="p1")
-        clip = _make_clip(config={"reverse": {"enabled": True}})
-        clip.actual_duration = 5.0
-
-        service = _make_service(plan, [clip], tmp_path=tmp_path)
-        from video_processing.unified_render_service import RenderLayer
-
-        layer = RenderLayer(role="main", clips=[clip])
-        layers = [layer]
-
-        assert service._can_use_pass_through(layers) is True
-
-
-class TestStickerIntegration:
-    """贴纸功能集成测试."""
-
-    def test_can_use_pass_through_with_stickers(self, tmp_path):
-        """有贴纸时禁用直通模式."""
-        plan = FakePlan(id="p1", config={"stickers": [{"type": "text", "text": "Hello", "position": "center"}]})
-        clip = _make_clip()
-        clip.actual_duration = 5.0
-
-        service = _make_service(plan, [clip], tmp_path=tmp_path)
-        from video_processing.unified_render_service import RenderLayer
-
-        layer = RenderLayer(role="main", clips=[clip])
-        layers = [layer]
-
-        assert service._can_use_pass_through(layers) is False
-
-    def test_can_use_pass_through_no_stickers(self, tmp_path):
-        """无贴纸时直通模式正常."""
-        plan = FakePlan(id="p1", config={})
-        clip = _make_clip()
-        clip.actual_duration = 5.0
-
-        service = _make_service(plan, [clip], tmp_path=tmp_path)
-        from video_processing.unified_render_service import RenderLayer
-
-        layer = RenderLayer(role="main", clips=[clip])
-        layers = [layer]
-
-        assert service._can_use_pass_through(layers) is True
-
-    def test_build_sticker_filters_text(self, tmp_path):
-        """文字贴纸滤镜构建."""
-        plan = FakePlan(
-            id="p1", config={"stickers": [{"type": "text", "text": "Hello", "position": "top_center", "z_index": 10}]}
-        )
-        service = _make_service(plan, [], tmp_path=tmp_path)
-
-        filter_str, extra_inputs = service._build_sticker_filters("in", "out")
-
-        assert "drawtext" in filter_str
-        assert len(extra_inputs) == 0
-
-    def test_build_sticker_filters_empty(self, tmp_path):
-        """无贴纸返回空."""
-        plan = FakePlan(id="p1", config={})
-        service = _make_service(plan, [], tmp_path=tmp_path)
-
-        filter_str, extra_inputs = service._build_sticker_filters("in", "out")
-
-        assert filter_str == ""
-        assert extra_inputs == []
-
-    def test_build_sticker_filters_image(self, sample_image, tmp_path):
-        """图片贴纸滤镜构建 + 额外输入."""
-        plan = FakePlan(
-            id="p1",
-            config={
-                "stickers": [
-                    {
-                        "type": "image",
-                        "image_path": str(sample_image),
-                        "position": "bottom_right",
-                        "z_index": 5,
-                    }
-                ]
-            },
-        )
-        service = _make_service(plan, [], tmp_path=tmp_path)
-
-        filter_str, extra_inputs = service._build_sticker_filters("in", "out")
-
-        assert "overlay" in filter_str
-        assert len(extra_inputs) == 1

tests/unit/test_cover_service.py

@@ -1,400 +0,0 @@
-"""
-封面管理服务单元测试
-"""
-
-import subprocess
-from pathlib import Path
-from unittest.mock import Mock, patch
-
-import pytest
-
-from apps.api.app.services.cover_service import (
-    COVER_STORAGE_PREFIX,
-    DEFAULT_COVER_HEIGHT,
-    DEFAULT_COVER_QUALITY,
-    DEFAULT_COVER_WIDTH,
-    CoverService,
-)
-
-
-class TestGetCoverConfig:
-    """get_cover_config 静态方法测试"""
-
-    def test_get_cover_config_default(self):
-        """测试默认封面配置"""
-        config = {}
-        result = CoverService.get_cover_config(config)
-        assert result["type"] == "ai_frame"
-        assert result["image_url"] == ""
-        assert result["frame_time"] is None
-
-    def test_get_cover_config_with_custom_values(self):
-        """测试自定义封面配置"""
-        config = {
-            "cover": {
-                "type": "manual",
-                "image_url": "https://example.com/cover.jpg",
-                "frame_time": 5.5,
-            }
-        }
-        result = CoverService.get_cover_config(config)
-        assert result["type"] == "manual"
-        assert result["image_url"] == "https://example.com/cover.jpg"
-        assert result["frame_time"] == 5.5
-
-    def test_get_cover_config_cover_not_dict(self):
-        """测试 cover 不是 dict 时返回默认值"""
-        config = {"cover": "not-a-dict"}
-        result = CoverService.get_cover_config(config)
-        assert result["type"] == "ai_frame"
-        assert result["image_url"] == ""
-        assert result["frame_time"] is None
-
-    def test_get_cover_config_partial_fields(self):
-        """测试部分字段存在时，其余字段用默认值"""
-        config = {"cover": {"type": "custom"}}
-        result = CoverService.get_cover_config(config)
-        assert result["type"] == "custom"
-        assert result["image_url"] == ""
-        assert result["frame_time"] is None
-
-    def test_get_cover_config_empty_cover_dict(self):
-        """测试空的 cover dict"""
-        config = {"cover": {}}
-        result = CoverService.get_cover_config(config)
-        assert result["type"] == "ai_frame"
-        assert result["image_url"] == ""
-
-
-class TestExtractCoverFromClip:
-    """extract_cover_from_clip 测试"""
-
-    @pytest.fixture
-    def mock_storage(self):
-        storage = Mock()
-        storage.download_file = Mock()
-        storage.upload_file = Mock()
-        storage.get_url = Mock(return_value="https://oss.example.com/covers/plan1/cover_1000.jpg")
-        return storage
-
-    @pytest.fixture
-    def mock_asset_repo(self):
-        repo = Mock()
-        repo.get = Mock(return_value=None)
-        return repo
-
-    @pytest.fixture
-    def video_asset(self):
-        asset = Mock()
-        asset.storage_key = "videos/test-video.mp4"
-        asset.mime_type = "video/mp4"
-        return asset
-
-    @pytest.fixture
-    def service(self, mock_storage, mock_asset_repo):
-        return CoverService(storage_service=mock_storage, asset_repository=mock_asset_repo)
-
-    def test_extract_cover_asset_not_found(self, service, mock_asset_repo):
-        """测试素材不存在时报错"""
-        mock_asset_repo.get.return_value = None
-
-        with pytest.raises(ValueError, match="素材不存在"):
-            service.extract_cover_from_clip(plan_id="plan-1", asset_id="nonexistent")
-
-    def test_extract_cover_asset_no_storage_key(self, service, mock_asset_repo):
-        """测试素材没有文件时报错"""
-        asset = Mock()
-        asset.storage_key = ""
-        asset.mime_type = "video/mp4"
-        mock_asset_repo.get.return_value = asset
-
-        with pytest.raises(ValueError, match="素材没有文件"):
-            service.extract_cover_from_clip(plan_id="plan-1", asset_id="asset-no-file")
-
-    def test_extract_cover_asset_not_video(self, service, mock_asset_repo):
-        """测试非视频素材报错"""
-        asset = Mock()
-        asset.storage_key = "images/photo.jpg"
-        asset.mime_type = "image/jpeg"
-        mock_asset_repo.get.return_value = asset
-
-        with pytest.raises(ValueError, match="素材不是视频类型"):
-            service.extract_cover_from_clip(plan_id="plan-1", asset_id="asset-img")
-
-    def test_extract_cover_download_failure(self, service, mock_asset_repo, mock_storage, video_asset):
-        """测试下载素材失败"""
-        mock_asset_repo.get.return_value = video_asset
-        mock_storage.download_file.side_effect = Exception("网络错误")
-
-        with pytest.raises(RuntimeError, match="下载素材失败"):
-            service.extract_cover_from_clip(plan_id="plan-1", asset_id="asset-1")
-
-    def test_extract_cover_upload_failure(self, service, mock_asset_repo, mock_storage, video_asset):
-        """测试上传封面失败"""
-        mock_asset_repo.get.return_value = video_asset
-
-        def fake_download(storage_key, local_path):
-            # 创建一个假的视频文件
-            Path(local_path).parent.mkdir(parents=True, exist_ok=True)
-            with open(local_path, "wb") as f:
-                f.write(b"fake video data")
-
-        mock_storage.download_file.side_effect = fake_download
-        mock_storage.upload_file.side_effect = Exception("上传失败")
-
-        # mock _extract_frame 避免真的调 ffmpeg
-        with patch.object(CoverService, "_extract_frame") as mock_extract:
-
-            def fake_extract(video_path, output_path, **kwargs):
-                # 创建假的封面文件
-                with open(output_path, "wb") as f:
-                    f.write(b"\xff\xd8\xff\xe0fake jpeg data")
-
-            mock_extract.side_effect = fake_extract
-
-            with pytest.raises(RuntimeError, match="上传封面失败"):
-                service.extract_cover_from_clip(plan_id="plan-1", asset_id="asset-1")
-
-    def test_extract_cover_get_url_falls_back_to_key(self, service, mock_asset_repo, mock_storage, video_asset):
-        """测试获取 URL 失败时降级为 storage_key"""
-        mock_asset_repo.get.return_value = video_asset
-
-        def fake_download(storage_key, local_path):
-            Path(local_path).parent.mkdir(parents=True, exist_ok=True)
-            with open(local_path, "wb") as f:
-                f.write(b"fake video data")
-
-        mock_storage.download_file.side_effect = fake_download
-        mock_storage.get_url.side_effect = Exception("URL服务不可用")
-
-        with patch.object(CoverService, "_extract_frame") as mock_extract:
-
-            def fake_extract(video_path, output_path, **kwargs):
-                with open(output_path, "wb") as f:
-                    f.write(b"\xff\xd8\xff\xe0fake jpeg")
-
-            mock_extract.side_effect = fake_extract
-
-            result = service.extract_cover_from_clip(plan_id="plan-abc", asset_id="asset-xyz", frame_time=2.5)
-
-        assert result["type"] == "manual"
-        assert result["frame_time"] == 2.5
-        # URL 失败时返回 storage_key
-        assert COVER_STORAGE_PREFIX in result["image_url"]
-        assert "plan-abc" in result["image_url"]
-
-    def test_extract_cover_success(self, service, mock_asset_repo, mock_storage, video_asset):
-        """测试抽帧成功完整流程"""
-        mock_asset_repo.get.return_value = video_asset
-
-        def fake_download(storage_key, local_path):
-            Path(local_path).parent.mkdir(parents=True, exist_ok=True)
-            with open(local_path, "wb") as f:
-                f.write(b"fake video data for testing")
-
-        mock_storage.download_file.side_effect = fake_download
-
-        with patch.object(CoverService, "_extract_frame") as mock_extract:
-
-            def fake_extract(video_path, output_path, **kwargs):
-                with open(output_path, "wb") as f:
-                    f.write(b"\xff\xd8\xff\xe0fake jpeg image data")
-
-            mock_extract.side_effect = fake_extract
-
-            result = service.extract_cover_from_clip(
-                plan_id="plan-123",
-                asset_id="asset-456",
-                frame_time=3.0,
-                width=720,
-                height=1280,
-                quality=3,
-            )
-
-        assert result["type"] == "manual"
-        assert result["image_url"] == "https://oss.example.com/covers/plan1/cover_1000.jpg"
-        assert result["frame_time"] == 3.0
-
-        # 验证上传被调用
-        mock_storage.upload_file.assert_called_once()
-        upload_args = mock_storage.upload_file.call_args[1]
-        assert upload_args["content_type"] == "image/jpeg"
-        assert "plan-123" in upload_args["storage_key"]
-        assert "3000" in upload_args["storage_key"]  # frame_time * 1000
-
-        # 验证 _extract_frame 被调用且参数正确
-        mock_extract.assert_called_once()
-        extract_kwargs = mock_extract.call_args[1]
-        assert extract_kwargs["time_sec"] == 3.0
-        assert extract_kwargs["width"] == 720
-        assert extract_kwargs["height"] == 1280
-        assert extract_kwargs["quality"] == 3
-
-
-class TestGenerateSmartCover:
-    """generate_smart_cover 测试"""
-
-    @pytest.fixture
-    def service(self):
-        return CoverService(storage_service=Mock(), asset_repository=Mock())
-
-    def test_generate_smart_cover_calls_extract_with_default_time(self, service):
-        """测试智能封面调用 extract_cover_from_clip 并设置 type 为 ai_frame"""
-        fake_result = {"type": "manual", "image_url": "test.jpg", "frame_time": 3.0}
-
-        with patch.object(service, "extract_cover_from_clip", return_value=fake_result) as mock_extract:
-            result = service.generate_smart_cover(plan_id="plan-1", asset_id="asset-1")
-
-            mock_extract.assert_called_once()
-            call_kwargs = mock_extract.call_args[1]
-            assert call_kwargs["plan_id"] == "plan-1"
-            assert call_kwargs["asset_id"] == "asset-1"
-            assert call_kwargs["frame_time"] == 3.0  # 默认第3秒
-
-        assert result["type"] == "ai_frame"
-        assert result["image_url"] == "test.jpg"
-
-    def test_generate_smart_cover_passes_dimensions(self, service):
-        """测试智能封面传递尺寸和质量参数"""
-        fake_result = {"type": "manual", "image_url": "test.jpg", "frame_time": 3.0}
-
-        with patch.object(service, "extract_cover_from_clip", return_value=fake_result) as mock_extract:
-            service.generate_smart_cover(
-                plan_id="plan-1",
-                asset_id="asset-1",
-                width=1080,
-                height=1920,
-                quality=5,
-            )
-
-            call_kwargs = mock_extract.call_args[1]
-            assert call_kwargs["width"] == 1080
-            assert call_kwargs["height"] == 1920
-            assert call_kwargs["quality"] == 5
-
-
-class TestExtractFrame:
-    """_extract_frame 静态方法测试（mock subprocess）"""
-
-    @pytest.fixture
-    def video_path(self, tmp_path):
-        path = tmp_path / "test_video.mp4"
-        path.write_bytes(b"fake video")
-        return path
-
-    @pytest.fixture
-    def output_path(self, tmp_path):
-        return tmp_path / "cover.jpg"
-
-    def test_extract_frame_success(self, video_path, output_path):
-        """测试 FFmpeg 抽帧成功"""
-        fake_result = Mock()
-        fake_result.returncode = 0
-
-        with patch("subprocess.run", return_value=fake_result) as mock_run:
-            CoverService._extract_frame(
-                video_path=video_path,
-                output_path=output_path,
-                time_sec=2.5,
-                width=1080,
-                height=1920,
-                quality=5,
-            )
-
-            assert mock_run.call_count == 1
-            cmd = mock_run.call_args[0][0]
-            assert cmd[0] == "ffmpeg"
-            assert "-ss" in cmd
-            assert "2.500" in cmd
-            assert "-vframes" in cmd
-            # 验证 scale+crop 滤镜存在
-            vf_index = cmd.index("-vf") + 1
-            assert "scale=" in cmd[vf_index]
-            assert "crop=" in cmd[vf_index]
-
-    def test_extract_frame_fallback_to_simple_command(self, video_path, output_path):
-        """测试主命令失败时回退到简化命令"""
-        fail_result = Mock()
-        fail_result.returncode = 1
-        fail_result.stderr = "Filter graph error"
-
-        success_result = Mock()
-        success_result.returncode = 0
-
-        call_count = 0
-
-        def fake_run(*args, **kwargs):
-            nonlocal call_count
-            call_count += 1
-            if call_count == 1:
-                return fail_result
-            return success_result
-
-        with patch("subprocess.run", side_effect=fake_run) as mock_run:
-            CoverService._extract_frame(
-                video_path=video_path,
-                output_path=output_path,
-                time_sec=1.0,
-                width=1080,
-                height=1920,
-                quality=5,
-            )
-
-            assert mock_run.call_count == 2
-            # 第二次是简化命令（没有 -vf 参数）
-            second_cmd = mock_run.call_args_list[1][0][0]
-            assert "-vf" not in second_cmd
-
-    def test_extract_frame_both_commands_fail(self, video_path, output_path):
-        """测试两个命令都失败时报错"""
-        fail_result = Mock()
-        fail_result.returncode = 1
-        fail_result.stderr = "Invalid data found when processing input"
-
-        with patch("subprocess.run", return_value=fail_result):
-            with pytest.raises(RuntimeError, match="FFmpeg 抽帧失败"):
-                CoverService._extract_frame(
-                    video_path=video_path,
-                    output_path=output_path,
-                    time_sec=1.0,
-                    width=1080,
-                    height=1920,
-                    quality=5,
-                )
-
-    def test_extract_frame_timeout(self, video_path, output_path):
-        """测试 FFmpeg 抽帧超时"""
-        with patch("subprocess.run", side_effect=subprocess.TimeoutExpired(cmd="ffmpeg", timeout=60)):
-            with pytest.raises(RuntimeError, match="FFmpeg 抽帧超时"):
-                CoverService._extract_frame(
-                    video_path=video_path,
-                    output_path=output_path,
-                    time_sec=1.0,
-                    width=1080,
-                    height=1920,
-                    quality=5,
-                )
-
-    def test_extract_frame_ffmpeg_not_found(self, video_path, output_path):
-        """测试 FFmpeg 不可用"""
-        with patch("subprocess.run", side_effect=FileNotFoundError("ffmpeg not found")):
-            with pytest.raises(RuntimeError, match="FFmpeg 不可用"):
-                CoverService._extract_frame(
-                    video_path=video_path,
-                    output_path=output_path,
-                    time_sec=1.0,
-                    width=1080,
-                    height=1920,
-                    quality=5,
-                )
-
-
-class TestDefaults:
-    """默认常量测试"""
-
-    def test_default_dimensions(self):
-        """测试默认尺寸常量"""
-        assert DEFAULT_COVER_WIDTH == 1080
-        assert DEFAULT_COVER_HEIGHT == 1920
-        assert DEFAULT_COVER_QUALITY == 5
-        assert COVER_STORAGE_PREFIX == "covers"

tests/unit/test_generated_video_creation_logic.py

@@ -310,9 +310,9 @@ class TestThumbnailInDedupHelpers:
         mock_dedup.VideoDeduplicator = MagicMock()
         sys.modules["video_processing.dedup"] = mock_dedup
 
-        # mock video_processing.thumbnail_generator
+        # mock video_processing.thumbnail_generator (统一封面管道: 仅保留 extract_first_frame)
         mock_thumb = MagicMock()
-        mock_thumb.generate_and_upload_thumbnail = MagicMock()
+        mock_thumb.extract_first_frame = MagicMock()
         sys.modules["video_processing.thumbnail_generator"] = mock_thumb
 
         # 关键：给 video_processing 包设置子模块属性，让 patch() 能通过属性访问找到
@@ -322,7 +322,7 @@ class TestThumbnailInDedupHelpers:
         video_processing.thumbnail_generator = mock_thumb
 
     def test_pre_generated_thumbnail_url_is_reused(self):
-        """传入 thumbnail_url 时直接复用，不调用 generate_and_upload_thumbnail。"""
+        """传入 thumbnail_url 时直接复用，统一封面管道不再自动生成缩略图。"""
         from video_processing.dedup_helpers import create_video_record_and_dedup
 
         engine = create_engine("sqlite:///:memory:")
@@ -339,26 +339,23 @@ class TestThumbnailInDedupHelpers:
                 mock_dedup.check_duplicate.return_value = None
                 mock_dedup.check_batch_duplicate.return_value = None
 
-                with patch("video_processing.thumbnail_generator.generate_and_upload_thumbnail") as mock_gen:
-                    result = create_video_record_and_dedup(
-                        generation_task_id="task-thumb-reuse",
-                        project_id="proj-1",
-                        batch_id="",
-                        file_url="https://oss.example.com/video.mp4",
-                        file_size=1024,
-                        duration=10.0,
-                        video_path="/tmp/fake.mp4",
-                        mode="edit_plan",
-                        session=session,
-                        width=1280,
-                        height=720,
-                        fps=25.0,
-                        thumbnail_url=pre_thumb_url,
-                    )
+                result = create_video_record_and_dedup(
+                    generation_task_id="task-thumb-reuse",
+                    project_id="proj-1",
+                    batch_id="",
+                    file_url="https://oss.example.com/video.mp4",
+                    file_size=1024,
+                    duration=10.0,
+                    video_path="/tmp/fake.mp4",
+                    mode="edit_plan",
+                    session=session,
+                    width=1280,
+                    height=720,
+                    fps=25.0,
+                    thumbnail_url=pre_thumb_url,
+                )
 
             assert result == 1
-            # 预生成缩略图时不应调用 generate_and_upload_thumbnail
-            mock_gen.assert_not_called()
 
             from packages.adapters.sqlalchemy_impl.models import GeneratedVideoModel
 
@@ -368,8 +365,8 @@ class TestThumbnailInDedupHelpers:
         finally:
             session.close()
 
-    def test_thumbnail_generated_when_not_provided(self):
-        """未传 thumbnail_url 时调用 generate_and_upload_thumbnail 生成。"""
+    def test_no_thumbnail_when_not_provided(self):
+        """未传 thumbnail_url 时不生成缩略图（统一封面管道已移除自动缩略图生成）。"""
         from video_processing.dedup_helpers import create_video_record_and_dedup
 
         engine = create_engine("sqlite:///:memory:")
@@ -377,8 +374,6 @@ class TestThumbnailInDedupHelpers:
         Session = sessionmaker(bind=engine)
         session = Session()
 
-        generated_thumb_url = "https://oss.example.com/generated-thumb.jpg"
-
         try:
             with patch("video_processing.dedup.VideoDeduplicator") as mock_dedup_cls:
                 mock_dedup = mock_dedup_cls.return_value
@@ -386,43 +381,34 @@ class TestThumbnailInDedupHelpers:
                 mock_dedup.check_duplicate.return_value = None
                 mock_dedup.check_batch_duplicate.return_value = None
 
-                with patch(
-                    "video_processing.thumbnail_generator.generate_and_upload_thumbnail",
-                    return_value=generated_thumb_url,
-                ) as mock_gen:
-                    result = create_video_record_and_dedup(
-                        generation_task_id="task-thumb-gen",
-                        project_id="proj-1",
-                        batch_id="",
-                        file_url="https://oss.example.com/video.mp4",
-                        file_size=1024,
-                        duration=10.0,
-                        video_path="/tmp/fake.mp4",
-                        mode="edit_plan",
-                        session=session,
-                        width=1280,
-                        height=720,
-                        fps=25.0,
-                    )
+                result = create_video_record_and_dedup(
+                    generation_task_id="task-thumb-gen",
+                    project_id="proj-1",
+                    batch_id="",
+                    file_url="https://oss.example.com/video.mp4",
+                    file_size=1024,
+                    duration=10.0,
+                    video_path="/tmp/fake.mp4",
+                    mode="edit_plan",
+                    session=session,
+                    width=1280,
+                    height=720,
+                    fps=25.0,
+                )
 
             assert result == 1
-            # 应调用一次缩略图生成
-            mock_gen.assert_called_once()
-            # 验证参数：video_path 和 storage_key
-            call_args = mock_gen.call_args
-            assert call_args[0][0] == "/tmp/fake.mp4"
-            assert "thumbnails" in call_args[0][1]
 
             from packages.adapters.sqlalchemy_impl.models import GeneratedVideoModel
 
             video = session.query(GeneratedVideoModel).filter_by(generation_task_id="task-thumb-gen").first()
             assert video is not None
-            assert video.thumbnail_url == generated_thumb_url
+            # 统一封面管道下，不传 thumbnail_url 时不自动生成
+            assert not video.thumbnail_url
         finally:
             session.close()
 
-    def test_thumbnail_generation_failure_does_not_block(self):
-        """缩略图生成失败不影响主流程。"""
+    def test_no_thumbnail_does_not_block(self):
+        """统一封面管道下，缩略图不再在 dedup 阶段生成。"""
         from video_processing.dedup_helpers import create_video_record_and_dedup
 
         engine = create_engine("sqlite:///:memory:")
@@ -437,24 +423,20 @@ class TestThumbnailInDedupHelpers:
                 mock_dedup.check_duplicate.return_value = None
                 mock_dedup.check_batch_duplicate.return_value = None
 
-                with patch(
-                    "video_processing.thumbnail_generator.generate_and_upload_thumbnail",
-                    side_effect=RuntimeError("cv2 not found"),
-                ):
-                    result = create_video_record_and_dedup(
-                        generation_task_id="task-thumb-fail",
-                        project_id="proj-1",
-                        batch_id="",
-                        file_url="https://oss.example.com/video.mp4",
-                        file_size=1024,
-                        duration=10.0,
-                        video_path="/tmp/fake.mp4",
-                        mode="edit_plan",
-                        session=session,
-                        width=1280,
-                        height=720,
-                        fps=25.0,
-                    )
+                result = create_video_record_and_dedup(
+                    generation_task_id="task-thumb-fail",
+                    project_id="proj-1",
+                    batch_id="",
+                    file_url="https://oss.example.com/video.mp4",
+                    file_size=1024,
+                    duration=10.0,
+                    video_path="/tmp/fake.mp4",
+                    mode="edit_plan",
+                    session=session,
+                    width=1280,
+                    height=720,
+                    fps=25.0,
+                )
 
             assert result == 1  # 不阻断
 

tests/unit/test_generation_cover.py

@@ -0,0 +1,554 @@
+"""Tests for generation cover route — schema validation and import checks."""
+
+from __future__ import annotations
+
+import pytest
+from pydantic import ValidationError
+
+
+def test_generation_cover_router_importable():
+    """新路由模块可以正确导入"""
+    from app.api.routes.generation_cover import router
+
+    assert router is not None
+    # tags 应该是 Generation
+    assert "Generation" in router.tags
+
+
+def test_generation_cover_route_path():
+    """路由路径应为 /generate-cover"""
+    from app.api.routes.generation_cover import router
+
+    paths = [route.path for route in router.routes]
+    assert "/generate-cover" in paths
+
+
+def test_generation_cover_schemas_importable():
+    """Schema 可以从新模块导入"""
+    from app.api.routes.generation_cover import GenerateCoverRequest, GenerateCoverResponse
+
+    # 验证请求 schema 默认值
+    req = GenerateCoverRequest()
+    assert req.asset_ids == []
+    assert req.cover_type == "ai_frame"
+    assert req.frame_time is None
+
+    # 验证响应 schema
+    resp = GenerateCoverResponse(plan_id="p1", cover={"image_url": "http://x"})
+    assert resp.plan_id == "p1"
+    assert resp.cover["image_url"] == "http://x"
+
+
+def test_generation_cover_schemas_not_in_templates_editor():
+    """旧的 templates_editor/schemas.py 不再包含封面 schema"""
+    from app.api.routes.templates_editor import schemas as te_schemas
+
+    assert not hasattr(te_schemas, "GenerateCoverRequest")
+    assert not hasattr(te_schemas, "GenerateCoverResponse")
+
+
+def test_templates_editor_no_cover_router():
+    """templates_editor 不再包含 cover_router"""
+    from app.api.routes.templates_editor import _sub_routers
+
+    # cover_router 应该已被移除
+    for sub in _sub_routers:
+        for route in sub.routes:
+            assert "generate-cover" not in getattr(route, "path", ""), "templates_editor 不应再有 generate-cover 路由"
+
+
+def test_api_router_has_generation_cover():
+    """api_router 应该包含 /api/v1/generation/generate-cover 路径"""
+    from app.api.router import api_router
+
+    all_paths = []
+    for route in api_router.routes:
+        if hasattr(route, "path"):
+            all_paths.append(route.path)
+        # 嵌套 router
+        if hasattr(route, "routes"):
+            for sub_route in route.routes:
+                if hasattr(sub_route, "path"):
+                    all_paths.append(sub_route.path)
+
+    # 应该能找到 generate-cover 路径
+    cover_paths = [p for p in all_paths if "generate-cover" in p]
+    assert len(cover_paths) > 0, f"未找到 generate-cover 路由, 所有路径: {all_paths[:20]}"
+
+
+def test_generation_cover_request_validation():
+    """验证请求 schema 的字段约束"""
+    from app.api.routes.generation_cover import GenerateCoverRequest
+
+    # frame_time 不允许负数
+    with pytest.raises(ValidationError):
+        GenerateCoverRequest(frame_time=-1.0)
+
+    # 合法的 frame_time
+    req = GenerateCoverRequest(frame_time=5.5)
+    assert req.frame_time == 5.5
+
+    # 自定义 cover_type
+    req2 = GenerateCoverRequest(cover_type="upload", asset_ids=["a1", "a2"])
+    assert req2.cover_type == "upload"
+    assert req2.asset_ids == ["a1", "a2"]
+
+
+class TestUnifiedCoverPipelineEndpoint:
+    """测试统一封面管道在 generate_cover endpoint 中的逻辑 (lines 189-215)."""
+
+    def test_cover_url_from_generation_task(self):
+        """当 GenerationTask 有 cover_url 时，直接返回该 URL 作为封面。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest, GenerateCoverResponse
+
+        # Mock plan with rendered_storage_key (so we skip the 3-step lookup)
+        mock_plan = MagicMock()
+        mock_plan.config = {
+            "generation_task_id": "task-123",
+            "rendered_storage_key": "rendered/plan-1/video.mp4",
+        }
+
+        # Mock plan_svc
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+
+        # Mock template_svc
+        mock_template_svc = MagicMock()
+
+        # Mock generation task with cover_url
+        mock_task = MagicMock()
+        mock_task.cover_url = "https://oss.example.com/rendered/plan-1/cover.jpg"
+
+        mock_db = MagicMock()
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.get.return_value = mock_task
+            mock_repo_cls.return_value = mock_repo
+
+            # normalize_plan_config should return the config with cover
+            mock_normalize.return_value = {
+                "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/rendered/plan-1/cover.jpg"}
+            }
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-1",
+                plan_id="plan-1",
+                services=(mock_template_svc, mock_plan_svc),
+                db=mock_db,
+                current_user=MagicMock(),
+            )
+
+            # 验证返回的封面数据来自 GenerationTask.cover_url
+            assert result.plan_id == "plan-1"
+            assert result.cover["image_url"] == "https://oss.example.com/rendered/plan-1/cover.jpg"
+            assert result.cover["type"] == "ai_frame"
+
+    def test_cover_url_all_fallbacks_fail_returns_400(self):
+        """当所有步骤都找不到 cover_url 时，返回 400 而非 500。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+        from fastapi import HTTPException
+
+        mock_plan = MagicMock()
+        mock_plan.config = {
+            "generation_task_id": "task-456",
+            "rendered_storage_key": "rendered/plan-2/video.mp4",
+        }
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        # Task has no cover_url
+        mock_task = MagicMock()
+        mock_task.cover_url = ""
+
+        mock_db = MagicMock()
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("packages.shared.storage.get_shared_storage_service") as mock_storage_getter,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.get.return_value = mock_task
+            # No tasks found by source_edit_plan_id or user+template
+            mock_repo.list_by_source_edit_plan.return_value = []
+            mock_repo.list_latest_completed_preview.return_value = []
+            mock_repo_cls.return_value = mock_repo
+
+            mock_storage_svc = MagicMock()
+            mock_storage_svc.get_url.return_value = "https://oss.example.com/rendered/plan-2/video.mp4"
+            mock_storage_getter.return_value = mock_storage_svc
+
+            from app.api.routes.generation_cover import generate_cover
+
+            with pytest.raises(HTTPException) as exc_info:
+                generate_cover(
+                    body=body,
+                    template_id="template-2",
+                    plan_id="plan-2",
+                    services=(mock_template_svc, mock_plan_svc),
+                    db=mock_db,
+                    current_user=MagicMock(),
+                )
+
+            assert exc_info.value.status_code == 400
+            assert "封面尚未生成" in exc_info.value.detail
+
+    def test_cover_url_found_via_source_edit_plan(self):
+        """步骤B：通过 source_edit_plan_id 找到预览任务的 cover_url。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        mock_plan = MagicMock()
+        # No generation_task_id, so step A is skipped
+        mock_plan.config = {
+            "rendered_storage_key": "rendered/plan-x/video.mp4",
+        }
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        # Preview task found by source_edit_plan_id with cover_url
+        mock_preview_task = MagicMock()
+        mock_preview_task.id = "preview-task-abc"
+        mock_preview_task.status = "completed"
+        mock_preview_task.cover_url = "https://oss.example.com/rendered/preview/cover.jpg"
+
+        mock_db = MagicMock()
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.list_by_source_edit_plan.return_value = [mock_preview_task]
+            mock_repo_cls.return_value = mock_repo
+
+            mock_normalize.return_value = {
+                "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/rendered/preview/cover.jpg"}
+            }
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-x",
+                plan_id="plan-x",
+                services=(mock_template_svc, mock_plan_svc),
+                db=mock_db,
+                current_user=MagicMock(),
+            )
+
+            assert result.cover["image_url"] == "https://oss.example.com/rendered/preview/cover.jpg"
+            mock_repo.list_by_source_edit_plan.assert_called_once_with("plan-x")
+
+    def test_cover_url_found_via_user_template(self):
+        """步骤C：通过 user+template 找到预览任务的 cover_url。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        mock_plan = MagicMock()
+        mock_plan.config = {
+            "rendered_storage_key": "rendered/plan-y/video.mp4",
+        }
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        # Step B finds nothing, step C finds a task
+        mock_preview_task = MagicMock()
+        mock_preview_task.id = "preview-task-def"
+        mock_preview_task.status = "completed"
+        mock_preview_task.cover_url = "https://oss.example.com/rendered/user-template-cover.jpg"
+
+        mock_current_user = MagicMock()
+        mock_current_user.user.id = "user-123"
+        mock_db = MagicMock()
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.list_by_source_edit_plan.return_value = []
+            mock_repo.list_latest_completed_preview.return_value = [mock_preview_task]
+            mock_repo_cls.return_value = mock_repo
+
+            mock_normalize.return_value = {
+                "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/rendered/user-template-cover.jpg"}
+            }
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-y",
+                plan_id="plan-y",
+                services=(mock_template_svc, mock_plan_svc),
+                db=mock_db,
+                current_user=mock_current_user,
+            )
+
+            assert result.cover["image_url"] == "https://oss.example.com/rendered/user-template-cover.jpg"
+            mock_repo.list_latest_completed_preview.assert_called_once_with(
+                user_id="user-123",
+                template_id="template-y",
+            )
+
+
+class TestSourceEditPlanFallback:
+    """测试步骤 2.5：通过 source_edit_plan_id 查找预览视频兜底逻辑。"""
+
+    def test_step25_finds_video_by_source_edit_plan_id(self):
+        """当步骤1和步骤2都找不到时，步骤2.5通过source_edit_plan_id找到预览视频和封面。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        # plan.config 没有 rendered_storage_key 和 generation_task_id
+        mock_plan = MagicMock()
+        mock_plan.config = {}
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        # Mock preview task found by source_edit_plan_id — with cover_url
+        mock_preview_task = MagicMock()
+        mock_preview_task.id = "preview-task-789"
+        mock_preview_task.status = "completed"
+        mock_preview_task.is_preview = True
+        mock_preview_task.cover_url = "https://oss.example.com/rendered/cover.jpg"
+
+        # Mock generated video
+        mock_video = MagicMock()
+        mock_video.file_url = "rendered/plan-x/video.mp4"
+
+        mock_db = MagicMock()
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.generation_cover.get_generated_video_repository") as mock_video_repo,
+            patch("app.api.routes.generation_cover.ListGeneratedVideosByTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.get.return_value = None
+            # Both video lookup (step 2.5) and cover_url lookup (step B) use this
+            mock_repo.list_by_source_edit_plan.return_value = [mock_preview_task]
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = [mock_video]
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_normalize.return_value = {
+                "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/rendered/cover.jpg"}
+            }
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-1",
+                plan_id="plan-x",
+                services=(mock_template_svc, mock_plan_svc),
+                db=mock_db,
+                current_user=MagicMock(),
+            )
+
+            # Verify step 2.5 was called for video
+            mock_repo.list_by_source_edit_plan.assert_called_with("plan-x")
+            # Cover was found via unified pipeline step B
+            assert result.cover["image_url"] == "https://oss.example.com/rendered/cover.jpg"
+
+    def test_step25_skips_non_completed_or_non_preview_tasks(self):
+        """步骤2.5跳过非completed或非is_preview的任务，继续到步骤3。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        mock_plan = MagicMock()
+        mock_plan.config = {}
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        # Task that is not completed
+        mock_task_failed = MagicMock()
+        mock_task_failed.id = "task-failed"
+        mock_task_failed.status = "failed"
+        mock_task_failed.is_preview = True
+        mock_task_failed.cover_url = ""
+
+        # Task that is not preview
+        mock_task_full = MagicMock()
+        mock_task_full.id = "task-full"
+        mock_task_full.status = "completed"
+        mock_task_full.is_preview = False
+        mock_task_full.cover_url = ""
+
+        mock_db = MagicMock()
+
+        # Step 3 fallback finds a valid preview task WITH cover_url
+        mock_step3_task = MagicMock()
+        mock_step3_task.id = "step3-task"
+        mock_step3_task.status = "completed"
+        mock_step3_task.cover_url = "https://oss.example.com/rendered/step3-cover.jpg"
+
+        mock_video = MagicMock()
+        mock_video.file_url = "rendered/step3/video.mp4"
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.generation_cover.get_generated_video_repository") as mock_video_repo,
+            patch("app.api.routes.generation_cover.ListGeneratedVideosByTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize,
+            patch("packages.shared.storage.get_shared_storage_service") as mock_storage_getter,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.get.return_value = None
+            mock_repo.list_by_source_edit_plan.return_value = [mock_task_failed, mock_task_full]
+            # Video step 3 and cover step C both use list_latest_completed_preview
+            mock_repo.list_latest_completed_preview.return_value = [mock_step3_task]
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = [mock_video]
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_normalize.return_value = {
+                "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/rendered/step3-cover.jpg"}
+            }
+
+            mock_storage_svc = MagicMock()
+            mock_storage_svc.get_url.return_value = "https://oss.example.com/rendered/step3/video.mp4"
+            mock_storage_getter.return_value = mock_storage_svc
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-1",
+                plan_id="plan-y",
+                services=(mock_template_svc, mock_plan_svc),
+                db=mock_db,
+                current_user=MagicMock(),
+            )
+
+            # Step 2.5 found tasks but none matched -> step 3 should be called
+            mock_repo.list_by_source_edit_plan.assert_called()
+            mock_repo.list_latest_completed_preview.assert_called()
+            assert result.cover["image_url"] == "https://oss.example.com/rendered/step3-cover.jpg"
+
+    def test_step25_exception_does_not_block_step3(self):
+        """步骤2.5异常时不影响步骤3兜底（视频和封面都通过步骤3找到）。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        mock_plan = MagicMock()
+        mock_plan.config = {}
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        mock_step3_task = MagicMock()
+        mock_step3_task.id = "step3-task"
+        mock_step3_task.status = "completed"
+        mock_step3_task.cover_url = "https://oss.example.com/rendered/step3-cover.jpg"
+
+        mock_video = MagicMock()
+        mock_video.file_url = "rendered/step3/video.mp4"
+
+        mock_db = MagicMock()
+
+        body = GenerateCoverRequest(cover_type="ai_frame")
+
+        with (
+            patch("app.api.routes.generation_cover.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.generation_cover.get_generated_video_repository") as mock_video_repo,
+            patch("app.api.routes.generation_cover.ListGeneratedVideosByTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize,
+            patch("packages.shared.storage.get_shared_storage_service") as mock_storage_getter,
+        ):
+            mock_repo = MagicMock()
+            mock_repo.get.return_value = None
+            # Both video step 2.5 and cover step B raise
+            mock_repo.list_by_source_edit_plan.side_effect = RuntimeError("db error")
+            # Step 3 / step C succeeds
+            mock_repo.list_latest_completed_preview.return_value = [mock_step3_task]
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = [mock_video]
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_normalize.return_value = {
+                "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/rendered/step3-cover.jpg"}
+            }
+
+            mock_storage_svc = MagicMock()
+            mock_storage_svc.get_url.return_value = "https://oss.example.com/rendered/step3/video.mp4"
+            mock_storage_getter.return_value = mock_storage_svc
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-1",
+                plan_id="plan-z",
+                services=(mock_template_svc, mock_plan_svc),
+                db=mock_db,
+                current_user=MagicMock(),
+            )
+
+            # Step 3 was called after step 2.5 failed
+            mock_repo.list_latest_completed_preview.assert_called()
+            assert result.cover["image_url"] == "https://oss.example.com/rendered/step3-cover.jpg"
+
+
+class TestStrayLoggerRemoved:
+    """验证多余的 logger.info(plan_id, generation_task_id) 已被删除。"""
+
+    def test_no_stray_logger_call_in_source(self):
+        """源码中不应存在 logger.info(plan_id, generation_task_id) 这样的调用。"""
+        import inspect
+
+        from app.api.routes import generation_cover
+
+        source = inspect.getsource(generation_cover)
+        # The stray call was logger.info(\n plan_id,\n generation_task_id,\n)
+        # with no format string — should not exist
+        assert (
+            "logger.info(\n                            plan_id," not in source
+        ), "Stray logger.info(plan_id, generation_task_id) should be removed"

tests/unit/test_mediakit_cover.py

@@ -3,6 +3,7 @@
 测试 #1208: AI封面接入MediaKit视频截帧
 """
 
+from pathlib import Path
 from unittest.mock import MagicMock, Mock, patch
 
 import pytest
@@ -140,43 +141,13 @@ class TestMediaKitClient:
 
 
 class TestAICoverService:
-    """AI 封面服务测试."""
-
-    @patch("packages.shared.mediakit_client.get_mediakit_client")
-    def test_call_ai_cover_with_mediakit_success(self, mock_get_client):
-        """MediaKit 抽帧成功."""
-        mock_client = Mock()
-        mock_client.is_available = True
-        mock_client.extract_frames.return_value = [{"image_url": "https://example.com/frame.jpg", "timestamp": 3.5}]
-        mock_get_client.return_value = mock_client
+    """AI 封面服务测试（统一封面管道后）。"""
 
+    def test_call_ai_cover_ai_frame_raises(self):
+        """ai_frame type raises RuntimeError in unified pipeline."""
         from packages.shared.ai_service import _call_ai_cover_service
 
-        result = _call_ai_cover_service(
-            plan_id="plan-123",
-            asset_ids=["asset-1"],
-            cover_type="ai_frame",
-            primary_video_url="https://example.com/video.mp4",
-        )
-
-        assert result["type"] == "ai_frame"
-        assert result["image_url"] == "https://example.com/frame.jpg"
-        assert result["frame_time"] == 3.5
-        assert result["confidence"] == 0.85
-
-        mock_client.extract_frames.assert_called_once()
-
-    @patch("packages.shared.mediakit_client.get_mediakit_client")
-    def test_call_ai_cover_with_mediakit_failure_raises(self, mock_get_client):
-        """MediaKit 失败时抛出 RuntimeError（不再降级到 stub）."""
-        mock_client = Mock()
-        mock_client.is_available = True
-        mock_client.extract_frames.side_effect = Exception("API error")
-        mock_get_client.return_value = mock_client
-
-        from packages.shared.ai_service import _call_ai_cover_service
-
-        with pytest.raises(RuntimeError, match="MediaKit"):
+        with pytest.raises(RuntimeError, match="封面数据不可用"):
             _call_ai_cover_service(
                 plan_id="plan-123",
                 asset_ids=["asset-1"],
@@ -184,12 +155,22 @@ class TestAICoverService:
                 primary_video_url="https://example.com/video.mp4",
             )
 
-    def test_call_ai_cover_without_video_url_raises(self):
-        """没有视频 URL 时抛出 RuntimeError（不再降级到 stub）."""
-
+    def test_call_ai_cover_ai_regenerate_raises(self):
+        """ai_regenerate type raises RuntimeError in unified pipeline."""
         from packages.shared.ai_service import _call_ai_cover_service
 
-        with pytest.raises(RuntimeError, match="MediaKit"):
+        with pytest.raises(RuntimeError, match="封面数据不可用"):
+            _call_ai_cover_service(
+                plan_id="plan-123",
+                asset_ids=["asset-1"],
+                cover_type="ai_regenerate",
+            )
+
+    def test_call_ai_cover_without_video_url_raises(self):
+        """ai_frame without video URL still raises RuntimeError."""
+        from packages.shared.ai_service import _call_ai_cover_service
+
+        with pytest.raises(RuntimeError, match="封面数据不可用"):
             _call_ai_cover_service(
                 plan_id="plan-123",
                 asset_ids=["asset-1"],
@@ -226,41 +207,6 @@ class TestAICoverService:
         assert result["type"] == "manual"
         assert result["frame_time"] == 5.0
 
-    @patch("packages.shared.mediakit_client.get_mediakit_client")
-    def test_call_ai_cover_mediakit_not_available_raises(self, mock_get_client):
-        """MediaKit 未配置时抛出 RuntimeError（不再降级到 stub）."""
-        mock_client = Mock()
-        mock_client.is_available = False
-        mock_get_client.return_value = mock_client
-
-        from packages.shared.ai_service import _call_ai_cover_service
-
-        with pytest.raises(RuntimeError, match="MediaKit"):
-            _call_ai_cover_service(
-                plan_id="plan-123",
-                asset_ids=["asset-1"],
-                cover_type="ai_frame",
-                primary_video_url="https://example.com/video.mp4",
-            )
-
-    @patch("packages.shared.mediakit_client.get_mediakit_client")
-    def test_call_ai_cover_empty_frames_raises(self, mock_get_client):
-        """MediaKit 返回空帧列表时抛出 RuntimeError（不再降级）."""
-        mock_client = Mock()
-        mock_client.is_available = True
-        mock_client.extract_frames.return_value = []
-        mock_get_client.return_value = mock_client
-
-        from packages.shared.ai_service import _call_ai_cover_service
-
-        with pytest.raises(RuntimeError, match="MediaKit"):
-            _call_ai_cover_service(
-                plan_id="plan-123",
-                asset_ids=["asset-1"],
-                cover_type="ai_frame",
-                primary_video_url="https://example.com/video.mp4",
-            )
-
 
 class TestGenerateCover:
     """run_generate_cover 测试."""

tests/unit/test_overlay_title_on_ass.py

@@ -0,0 +1,242 @@
+"""测试 ASR 字幕路径的标题叠加功能。
+
+验证：
+1. _overlay_title_on_ass 函数正确地将标题事件追加到 ASR 生成的 ASS 文件中
+2. _maybe_generate_ass 在 ASR 路径中正确叠加标题
+3. ASR 无结果但有标题时，仍然生成标题 ASS
+4. ASR 失败但有标题时，降级生成标题 ASS
+"""
+
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from apps.worker.video_processing.unified_render_service import _overlay_title_on_ass
+
+
+class TestOverlayTitleOnAss:
+    """_overlay_title_on_ass 函数测试"""
+
+    def test_overlay_title_adds_style_and_dialogue(self, tmp_path):
+        """标题 Style 和 Dialogue 正确插入 ASS 文件"""
+        # 准备一个模拟 ASR 生成的 ASS 文件
+        ass_content = """[Script Info]
+ScriptType: v4.00+
+PlayResX: 1280
+PlayResY: 720
+ScaledBorderAndShadow: yes
+WrapStyle: 2
+Encoding: UTF-8
+
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+Style: Default,思源黑体,24,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,-1,0,0,0,100,100,0,0,1,1.5,0,2,40,40,60,1
+
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+Dialogue: 0,0:00:00.00,0:00:10.00,Default,,0,0,0,,这是ASR字幕
+"""
+        ass_path = tmp_path / "test.ass"
+        ass_path.write_text(ass_content, encoding="utf-8")
+
+        # 叠加标题
+        _overlay_title_on_ass(
+            ass_path,
+            title_text="测试标题",
+            title_config={"position": "top", "font": "思源黑体", "size": 48, "color": "#ffffff"},
+            video_width=1280,
+            video_height=720,
+            video_duration=10.0,
+        )
+
+        # 验证结果
+        result = ass_path.read_text(encoding="utf-8")
+        assert "Style: TitleStyle" in result, "TitleStyle 应被插入"
+        assert "测试标题" in result, "标题文本应出现在 Dialogue 中"
+        # 原有的 ASR 字幕应该保留
+        assert "这是ASR字幕" in result, "原有 ASR 字幕应保留"
+        # TitleStyle 应该在 Default Style 之后
+        lines = result.splitlines()
+        style_lines = [i for i, ln in enumerate(lines) if ln.startswith("Style:")]
+        assert len(style_lines) >= 2, "应有至少两个 Style 行"
+
+    def test_overlay_title_empty_text_noop(self, tmp_path):
+        """空标题文本时不修改 ASS 文件"""
+        ass_content = "[Script Info]\n\n[V4+ Styles]\nStyle: Default,test\n\n[Events]\nFormat: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\nDialogue: 0,0:00:00.00,0:00:10.00,Default,,0,0,0,,test\n"
+        ass_path = tmp_path / "test.ass"
+        ass_path.write_text(ass_content, encoding="utf-8")
+
+        _overlay_title_on_ass(
+            ass_path,
+            title_text="",
+            title_config={},
+            video_width=1280,
+            video_height=720,
+            video_duration=10.0,
+        )
+
+        result = ass_path.read_text(encoding="utf-8")
+        assert "TitleStyle" not in result, "空标题不应添加 TitleStyle"
+
+    def test_overlay_title_preserves_asr_events(self, tmp_path):
+        """叠加标题后 ASR 字幕事件保持不变"""
+        ass_content = """[Script Info]
+ScriptType: v4.00+
+PlayResX: 1920
+PlayResY: 1080
+
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+Style: Default,思源黑体,24,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,-1,0,0,0,100,100,0,0,1,1.5,0,2,40,40,60,1
+
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+Dialogue: 0,0:00:00.50,0:00:03.00,Default,,0,0,0,,第一段字幕
+Dialogue: 0,0:00:03.50,0:00:06.00,Default,,0,0,0,,第二段字幕
+Dialogue: 0,0:00:06.50,0:00:10.00,Default,,0,0,0,,第三段字幕
+"""
+        ass_path = tmp_path / "test.ass"
+        ass_path.write_text(ass_content, encoding="utf-8")
+
+        _overlay_title_on_ass(
+            ass_path,
+            title_text="我的标题",
+            title_config={"position": "top", "size": 48},
+            video_width=1920,
+            video_height=1080,
+            video_duration=10.0,
+        )
+
+        result = ass_path.read_text(encoding="utf-8")
+        # 所有 ASR 字幕段都应保留
+        assert "第一段字幕" in result
+        assert "第二段字幕" in result
+        assert "第三段字幕" in result
+        # 标题也应存在
+        assert "我的标题" in result
+
+
+class TestMaybeGenerateAssWithTitle:
+    """_maybe_generate_ass 方法在 ASR 路径中标题叠加的集成测试"""
+
+    def _make_service(self, tmp_path, plan_config, asr_service=None):
+        """创建简化的 UnifiedRenderService 实例用于测试"""
+        from apps.worker.video_processing.unified_render_service import UnifiedRenderService
+
+        service = object.__new__(UnifiedRenderService)
+        service.plan = MagicMock()
+        service.plan.id = "test_plan_001"
+        service.plan.config = plan_config
+        service.work_dir = tmp_path
+        service.output_width = 1280
+        service.output_height = 720
+        service.asr_service = asr_service
+        service._asr_timeline_cached = False
+        service._asr_timeline_cache = None
+        return service
+
+    def test_asr_path_with_title_overlays_title(self, tmp_path):
+        """ASR 路径 + 有标题 → 标题叠加到 ASS 文件"""
+        plan_config = {
+            "title": {
+                "text": "测试标题",
+                "enabled": True,
+                "position": "top",
+                "size": 48,
+                "font": "思源黑体",
+                "color": "#ffffff",
+            },
+            "subtitle": {"enabled": True, "auto_generated": True},
+        }
+
+        # Mock ASR service
+        mock_asr = MagicMock()
+        service = self._make_service(tmp_path, plan_config, asr_service=mock_asr)
+
+        # Mock _generate_asr_subtitles to return a timeline with segments
+        mock_timeline = MagicMock()
+        mock_segment = MagicMock()
+        mock_segment.start = 0.0
+        mock_segment.end = 3.0
+        mock_segment.text = "ASR识别的文字"
+        mock_timeline.segments = [mock_segment]
+        mock_timeline.segment_count = 1
+
+        with patch.object(service, "_generate_asr_subtitles", return_value=mock_timeline):
+            result = service._maybe_generate_ass(video_duration=10.0)
+
+        assert result is not None, "应生成 ASS 文件"
+        content = result.read_text(encoding="utf-8")
+        assert "测试标题" in content, "标题应出现在 ASS 文件中"
+        assert "ASR识别的文字" in content, "ASR 字幕也应保留"
+
+    def test_asr_no_result_with_title_generates_title_ass(self, tmp_path):
+        """ASR 无结果 + 有标题 → 仍然生成标题 ASS"""
+        plan_config = {
+            "title": {"text": "仅标题", "enabled": True, "position": "top", "size": 48},
+            "subtitle": {"enabled": True, "auto_generated": True},
+        }
+
+        mock_asr = MagicMock()
+        service = self._make_service(tmp_path, plan_config, asr_service=mock_asr)
+
+        # Mock ASR returns empty timeline
+        mock_timeline = MagicMock()
+        mock_timeline.segments = []
+
+        with patch.object(service, "_generate_asr_subtitles", return_value=mock_timeline):
+            result = service._maybe_generate_ass(video_duration=10.0)
+
+        assert result is not None, "有标题时应生成 ASS 文件"
+        content = result.read_text(encoding="utf-8")
+        assert "仅标题" in content, "标题应出现在 ASS 文件中"
+
+    def test_asr_failure_with_title_generates_title_ass(self, tmp_path):
+        """ASR 失败 + 有标题 → 降级生成标题 ASS"""
+        plan_config = {
+            "title": {"text": "降级标题", "enabled": True, "position": "top", "size": 48},
+            "subtitle": {"enabled": True, "auto_generated": True},
+        }
+
+        mock_asr = MagicMock()
+        service = self._make_service(tmp_path, plan_config, asr_service=mock_asr)
+
+        # Mock ASR raises exception
+        with patch.object(service, "_generate_asr_subtitles", side_effect=RuntimeError("ASR error")):
+            result = service._maybe_generate_ass(video_duration=10.0)
+
+        assert result is not None, "ASR 失败但有标题时应生成 ASS 文件"
+        content = result.read_text(encoding="utf-8")
+        assert "降级标题" in content, "标题应出现在降级 ASS 文件中"
+
+    def test_overlay_failure_preserves_asr_data(self, tmp_path):
+        """_overlay_title_on_ass 抛异常时，ASR 生成的 ASS 文件应保留并返回"""
+        plan_config = {
+            "title": {"text": "测试标题", "enabled": True, "position": "top", "size": 48},
+            "subtitle": {"enabled": True, "auto_generated": True},
+        }
+
+        mock_asr = MagicMock()
+        service = self._make_service(tmp_path, plan_config, asr_service=mock_asr)
+
+        mock_timeline = MagicMock()
+        mock_segment = MagicMock()
+        mock_segment.start = 0.0
+        mock_segment.end = 3.0
+        mock_segment.text = "ASR识别的文字"
+        mock_timeline.segments = [mock_segment]
+        mock_timeline.segment_count = 1
+
+        with patch.object(service, "_generate_asr_subtitles", return_value=mock_timeline):
+            with patch(
+                "apps.worker.video_processing.unified_render_service._overlay_title_on_ass",
+                side_effect=RuntimeError("模拟叠加标题失败"),
+            ):
+                result = service._maybe_generate_ass(video_duration=10.0)
+
+        # 即使 _overlay_title_on_ass 失败，仍返回 ASS 文件
+        assert result is not None, "应返回 ASS 文件路径"
+        assert result.exists(), "ASS 文件应存在"
+        content = result.read_text(encoding="utf-8")
+        assert "ASR识别的文字" in content, "ASR 字幕数据应保留"

tests/unit/test_preview_title_config.py

@@ -0,0 +1,190 @@
+"""Tests for preview title_config feature.
+
+验证预览 API 的 title_config 字段和 Worker 的标题配置解析逻辑。
+"""
+
+from __future__ import annotations
+
+import json
+
+import pytest
+
+
+class TestPreviewTitleConfigSchema:
+    """测试 CreatePreviewGenerationTaskRequest 的 title_config 字段."""
+
+    def test_title_config_default_empty(self):
+        """title_config 默认为空 dict."""
+        from app.schemas.generation_task import CreatePreviewGenerationTaskRequest
+
+        req = CreatePreviewGenerationTaskRequest(
+            template_id="test_template",
+            asset_ids=["asset1"],
+        )
+        assert req.title_config == {}
+
+    def test_title_config_with_text(self):
+        """传入标题文本."""
+        from app.schemas.generation_task import CreatePreviewGenerationTaskRequest
+
+        req = CreatePreviewGenerationTaskRequest(
+            template_id="test_template",
+            asset_ids=["asset1"],
+            title_config={"text": "测试标题"},
+        )
+        assert req.title_config["text"] == "测试标题"
+
+    def test_title_config_with_full_style(self):
+        """传入完整标题样式配置."""
+        from app.schemas.generation_task import CreatePreviewGenerationTaskRequest
+
+        config = {
+            "text": "我的视频标题",
+            "font": "思源黑体",
+            "font_size": 48,
+            "font_color": "#ffffff",
+            "position": "top",
+            "bold": True,
+            "stroke": 2,
+            "shadow": True,
+        }
+        req = CreatePreviewGenerationTaskRequest(
+            template_id="test_template",
+            asset_ids=["asset1"],
+            title_config=config,
+        )
+        assert req.title_config["text"] == "我的视频标题"
+        assert req.title_config["font_size"] == 48
+        assert req.title_config["position"] == "top"
+
+
+class TestCommandTitleConfig:
+    """测试 CreateGenerationTaskCommand 的 title_config 字段."""
+
+    def test_command_has_title_config(self):
+        """Command 包含 title_config 字段."""
+        from packages.application.generation_tasks import CreateGenerationTaskCommand
+
+        cmd = CreateGenerationTaskCommand(
+            title_config={"text": "hello", "font_size": 32},
+        )
+        assert cmd.title_config["text"] == "hello"
+        assert cmd.title_config["font_size"] == 32
+
+    def test_command_title_config_default_empty(self):
+        """Command 的 title_config 默认为空 dict."""
+        from packages.application.generation_tasks import CreateGenerationTaskCommand
+
+        cmd = CreateGenerationTaskCommand()
+        assert cmd.title_config == {}
+
+
+class TestWorkerTitleConfigParsing:
+    """测试 Worker 渲染时的标题配置解析逻辑."""
+
+    def test_json_format_parsing(self):
+        """JSON 格式的 custom_title 能正确解析."""
+        config = {"text": "测试标题", "font_size": 48, "font_color": "#ff0000"}
+        custom_title = json.dumps(config, ensure_ascii=False)
+
+        ct_stripped = custom_title.strip()
+        parsed = None
+        if ct_stripped.startswith("{"):
+            try:
+                parsed = json.loads(ct_stripped)
+            except (json.JSONDecodeError, ValueError):
+                parsed = None
+
+        assert parsed is not None
+        assert parsed["text"] == "测试标题"
+        assert parsed["font_size"] == 48
+
+    def test_plain_text_fallback(self):
+        """纯文本的 custom_title 不触发 JSON 解析."""
+        custom_title = "简单的标题文字"
+
+        ct_stripped = custom_title.strip()
+        parsed = None
+        if ct_stripped.startswith("{"):
+            try:
+                parsed = json.loads(ct_stripped)
+            except (json.JSONDecodeError, ValueError):
+                parsed = None
+
+        assert parsed is None
+
+    def test_invalid_json_fallback(self):
+        """无效 JSON 的 custom_title 降级为纯文本."""
+        custom_title = "{invalid json"
+
+        ct_stripped = custom_title.strip()
+        parsed = None
+        if ct_stripped.startswith("{"):
+            try:
+                parsed = json.loads(ct_stripped)
+            except (json.JSONDecodeError, ValueError):
+                parsed = None
+
+        assert parsed is None
+
+    def test_json_without_text_skipped(self):
+        """JSON 格式但缺少 text 字段时，跳过标题注入."""
+        config = {"font_size": 48}
+        custom_title = json.dumps(config, ensure_ascii=False)
+
+        ct_stripped = custom_title.strip()
+        parsed = json.loads(ct_stripped)
+        title_text = (parsed.get("text") or "").strip()
+
+        assert title_text == ""
+
+    def test_style_key_mapping(self):
+        """前端字段名正确映射到 ASS 字段名."""
+        config = {
+            "text": "标题",
+            "font_size": 48,
+            "font_color": "#ffffff",
+            "font_preset": "思源黑体",
+        }
+
+        style_keys = ["font", "font_size", "font_color", "position", "bold", "stroke", "shadow", "font_preset"]
+        title_cfg = {}
+        for key in style_keys:
+            if key in config and config[key] is not None:
+                mapped_key = {
+                    "font_size": "size",
+                    "font_color": "color",
+                    "font_preset": "font",
+                }.get(key, key)
+                title_cfg[mapped_key] = config[key]
+
+        assert title_cfg["size"] == 48
+        assert title_cfg["color"] == "#ffffff"
+        assert title_cfg["font"] == "思源黑体"
+
+
+class TestPreviewRouteTitleConfigPassing:
+    """测试预览路由正确序列化 title_config 到 custom_title."""
+
+    def test_title_config_serialization(self):
+        """title_config 序列化为 JSON 字符串."""
+        title_config = {
+            "text": "我的标题",
+            "font_size": 32,
+            "font_color": "#d4a843",
+        }
+        serialized = json.dumps(title_config, ensure_ascii=False)
+
+        parsed = json.loads(serialized)
+        assert parsed["text"] == "我的标题"
+        assert parsed["font_size"] == 32
+
+    def test_empty_title_config_produces_empty_string(self):
+        """空 title_config 时 custom_title 为空字符串."""
+        title_config = {}
+        title_text = (title_config.get("text") or "").strip()
+        custom_title_value = ""
+        if title_text:
+            custom_title_value = json.dumps(title_config, ensure_ascii=False)
+
+        assert custom_title_value == ""

tests/unit/test_render_adapter.py

@@ -348,24 +348,32 @@ class TestRenderPlan:
         mock_render_cls.return_value = mock_render
         mock_upload.return_value = "https://oss.example.com/out.mp4"
 
-        fake_thumb = "https://oss.example.com/rendered/plan_thumb/thumbnail.jpg"
-
         plan = FakePlan(id="plan_thumb")
         clips = [_make_clip("c1", order=0, duration=5.0)]
         asset_url_map = {"asset_c1.mp4": "https://test-bucket.oss.com/assets/asset_c1.mp4"}
         adapter, _, _ = _make_adapter(plan=plan, clips=clips, asset_url_map=asset_url_map)
 
+        # Mock extract_first_frame to return a temp file path
+        import tempfile as _tf
+
+        _fake_frame = _tf.NamedTemporaryFile(suffix=".jpg", delete=False)
+        _fake_frame.write(b"fake frame")
+        _fake_frame.close()
         with patch(
-            "video_processing.thumbnail_generator.generate_and_upload_thumbnail",
-            return_value=fake_thumb,
+            "video_processing.thumbnail_generator.extract_first_frame",
+            return_value=_fake_frame.name,
         ):
             result = adapter.render_plan(
                 "plan_thumb",
                 work_dir=tmp_path / "work",
             )
+        from pathlib import Path as _P
+
+        _P(_fake_frame.name).unlink(missing_ok=True)
 
         assert result.success
-        assert result.thumbnail_url == fake_thumb
+        # cover_url from upload_to_oss (mocked globally)
+        assert result.thumbnail_url == "https://oss.example.com/out.mp4"
 
     @patch("video_processing.render_adapter.upload_to_oss")
     @patch("video_processing.render_adapter.UnifiedRenderService")
@@ -397,8 +405,8 @@ class TestRenderPlan:
         adapter, _, _ = _make_adapter(plan=plan, clips=clips, asset_url_map=asset_url_map)
 
         with patch(
-            "video_processing.thumbnail_generator.generate_and_upload_thumbnail",
-            side_effect=RuntimeError("cv2 not available"),
+            "video_processing.thumbnail_generator.extract_first_frame",
+            side_effect=RuntimeError("ffmpeg not available"),
         ):
             result = adapter.render_plan(
                 "plan_thumb_fail",

tests/unit/test_shared_ai_service.py

@@ -436,12 +436,12 @@ class TestAiCoverService:
 
     def test_cover_type_ai_frame_raises_without_mediakit(self):
         """ai_frame mode raises RuntimeError when MediaKit is unavailable."""
-        with pytest.raises(RuntimeError, match="MediaKit"):
+        with pytest.raises(RuntimeError, match="封面数据不可用"):
             _call_ai_cover_service("plan1", ["a1"], "ai_frame")
 
     def test_cover_type_ai_regenerate_raises_without_mediakit(self):
         """ai_regenerate mode raises RuntimeError when MediaKit is unavailable."""
-        with pytest.raises(RuntimeError, match="MediaKit"):
+        with pytest.raises(RuntimeError, match="封面数据不可用"):
             _call_ai_cover_service("plan1", ["a1"], "ai_regenerate")
 
     def test_cover_type_manual_still_works(self):