fix: 修复 usePreviewAssets 无限循环请求

- 添加 useStableArray hook 稳定化 assetIds 引用
- 只有数组内容真正变化时才触发重新请求
- 避免父组件 re-render 导致的无效 API 调用

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

@@ -49,6 +49,10 @@ class GenerateCoverRequest(BaseModel):
         ge=0.0,
         description="手动选帧时间点（秒），仅 cover_type=manual 时有效",
     )
+    cover_url: Optional[str] = Field(
+        default=None,
+        description="上传的封面图片 URL，仅 cover_type=upload 时有效",
+    )
 
 
 class GenerateCoverResponse(BaseModel):
@@ -80,6 +84,29 @@ def generate_cover(
     _, plan_svc = services
     plan = plan_svc.get_plan_or_raise(plan_id)
 
+    # ── upload 类型：直接保存前端上传的封面图片，不需要预览视频 ──────
+    if body.cover_type == "upload":
+        if not body.cover_url:
+            raise HTTPException(
+                status_code=400,
+                detail="cover_type=upload 时必须提供 cover_url",
+            )
+        cover_data = {
+            "type": "upload",
+            "image_url": body.cover_url,
+        }
+        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(
+            "封面上传完成: plan_id=%s cover_url=%s by user=%s",
+            plan_id,
+            body.cover_url[:80] if body.cover_url else "",
+            current_user.user.id,
+        )
+        return GenerateCoverResponse(plan_id=plan_id, cover=cover_data)
+
     # ── 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)

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

@@ -16,13 +16,16 @@
 from __future__ import annotations
 
 import logging
-from typing import Any
 
 from app.auth import AuthenticatedUser, get_current_user
+from app.core.storage import get_storage_service
+from app.dependencies import get_asset_repository
 from app.services.edit_plan_service import EditPlanService
 from app.services.edit_template_service import EditTemplateService
 from fastapi import APIRouter, Depends, HTTPException, Query, status
 
+from packages.adapters.sqlalchemy_impl.asset_repository import SQLAlchemyAssetRepository
+
 from .dependencies import get_draft_plan_id, get_editor_services
 from .schemas import (
     ClipBatchDeleteRequest,
@@ -43,30 +46,100 @@ logger = logging.getLogger(__name__)
 router = APIRouter(tags=["Template Editor"])
 
 
-def _clip_to_response(clip) -> EditorClipResponse:
-    """统一构造片段响应"""
+def _clip_to_response(clip, asset_url: str | None = None) -> EditorClipResponse:
+    """统一构造片段响应 — 与 edit_plan_clips 表字段完全对齐"""
+
+    def _enum_str(val) -> str:
+        return val.value if hasattr(val, "value") else str(val)
+
+    def _fmt_dt(val) -> str:
+        if val is None:
+            return ""
+        if hasattr(val, "isoformat"):
+            return val.isoformat()
+        return str(val)
+
     return EditorClipResponse(
         id=clip.id,
         plan_id=clip.plan_id,
-        clip_type=clip.clip_type.value
-        if hasattr(clip.clip_type, "value")
-        else str(clip.clip_type),
+        clip_type=_enum_str(getattr(clip, "clip_type", "")),
         order=clip.order,
         duration=clip.duration,
+        start_time=getattr(clip, "start_time", 0.0) or 0.0,
         text_content=clip.text_content or "",
-        transition_effect=clip.transition_effect.value
-        if hasattr(clip.transition_effect, "value")
-        else str(clip.transition_effect),
+        transition_effect=_enum_str(getattr(clip, "transition_effect", "cut")),
+        transition_duration=getattr(clip, "transition_duration", 0.0) or 0.0,
         playback_speed=clip.playback_speed or 1.0,
+        asset_id=getattr(clip, "asset_id", "") or "",
+        asset_url=asset_url,
+        status=getattr(clip, "status", "pending") or "pending",
+        template_clip_config_id=getattr(clip, "template_clip_config_id", "") or "",
         config=clip.config or {},
+        created_at=_fmt_dt(getattr(clip, "created_at", None)),
+        updated_at=_fmt_dt(getattr(clip, "updated_at", None)),
     )
 
 
+def _build_asset_url_map(
+    asset_ids: list[str],
+    asset_repo: SQLAlchemyAssetRepository,
+) -> dict[str, str | None]:
+    """批量查询素材并生成签名URL映射.
+
+    Returns:
+        {asset_id: signed_url_or_None}
+    """
+    if not asset_ids:
+        return {}
+
+    # 去重：多个 clip 可能引用同一个素材
+    # 去重并保持顺序
+    seen: set[str] = set()
+    unique_ids = []
+    for aid in asset_ids:
+        if aid and aid not in seen:
+            seen.add(aid)
+            unique_ids.append(aid)
+
+    result: dict[str, str | None] = {}
+    try:
+        storage = get_storage_service()
+    except Exception:
+        logger.warning("获取存储服务失败，跳过asset_url生成")
+        return {aid: None for aid in asset_ids}
+
+    # 批量查询所有 Asset（单次 SQL IN 查询，避免 N+1）
+    try:
+        assets = asset_repo.find_by_ids(unique_ids)
+        asset_map = {a.id: a for a in assets}
+    except Exception:
+        logger.warning("批量查询素材失败: asset_ids=%s", asset_ids, exc_info=True)
+        return {aid: None for aid in asset_ids if aid}
+
+    for aid in unique_ids:
+        try:
+            asset = asset_map.get(aid)
+            if asset is None:
+                result[aid] = None
+                continue
+            storage_key = getattr(asset, "storage_key", None) or ""
+            if not storage_key:
+                result[aid] = None
+                continue
+            result[aid] = storage.get_download_url(storage_key, expires_seconds=3600)
+        except Exception:
+            logger.warning("生成素材签名URL失败: asset_id=%s", aid, exc_info=True)
+            result[aid] = None
+
+    return result
+
+
 @router.get("/clips", response_model=EditorClipListResponse)
 def list_draft_clips(
     template_id: str,
     plan_id: str = Depends(get_draft_plan_id),
     services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
+    asset_repo: SQLAlchemyAssetRepository = Depends(get_asset_repository),
     skip: int = Query(default=0, ge=0),
     limit: int = Query(default=100, ge=1, le=500),
     _: AuthenticatedUser = Depends(get_current_user),
@@ -75,8 +148,17 @@ def list_draft_clips(
     _, plan_svc = services
     clips = plan_svc.list_clips(plan_id, skip=skip, limit=limit)
     total = plan_svc.count_clips(plan_id)
+
+    # 批量解析素材签名URL
+    asset_ids = [getattr(c, "asset_id", "") or "" for c in clips]
+    asset_ids = [aid for aid in asset_ids if aid]
+    url_map = _build_asset_url_map(asset_ids, asset_repo)
+
     return EditorClipListResponse(
-        items=[_clip_to_response(c) for c in clips],
+        items=[
+            _clip_to_response(c, asset_url=url_map.get(getattr(c, "asset_id", "") or ""))
+            for c in clips
+        ],
         total=total,
     )
 
@@ -156,6 +238,7 @@ def get_draft_clip_detail(
     clip_id: str,
     plan_id: str = Depends(get_draft_plan_id),
     services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
+    asset_repo: SQLAlchemyAssetRepository = Depends(get_asset_repository),
     _: AuthenticatedUser = Depends(get_current_user),
 ):
     """获取草稿中的片段详情"""
@@ -165,16 +248,20 @@ def get_draft_clip_detail(
         raise HTTPException(status_code=404, detail="片段不存在")
     if clip.plan_id != plan_id:
         raise HTTPException(status_code=404, detail="片段不存在")
-    return _clip_to_response(clip)
+
+    asset_id = getattr(clip, "asset_id", "") or ""
+    url_map = _build_asset_url_map([asset_id], asset_repo) if asset_id else {}
+    return _clip_to_response(clip, asset_url=url_map.get(asset_id))
 
 
-@router.post("/clips/{clip_id}/split", response_model=dict[str, Any], status_code=status.HTTP_200_OK)
+@router.post("/clips/{clip_id}/split", status_code=status.HTTP_200_OK)
 def split_draft_clip(
     template_id: str,
     clip_id: str,
     body: SplitClipRequest,
     plan_id: str = Depends(get_draft_plan_id),
     services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
+    asset_repo: SQLAlchemyAssetRepository = Depends(get_asset_repository),
     _: AuthenticatedUser = Depends(get_current_user),
 ):
     """将一个片段从指定时间点分割为两个片段"""
@@ -190,32 +277,22 @@ def split_draft_clip(
         ) from exc
     left = result["left_clip"]
     right = result["right_clip"]
+    asset_ids = [getattr(left, "asset_id", "") or "", getattr(right, "asset_id", "") or ""]
+    asset_ids = [a for a in asset_ids if a]
+    url_map = _build_asset_url_map(asset_ids, asset_repo)
     return {
-        "left_clip": {
-            "id": left.id,
-            "plan_id": left.plan_id,
-            "clip_type": left.clip_type,
-            "order": left.order,
-            "duration": left.duration,
-            "start_time": left.start_time,
-        },
-        "right_clip": {
-            "id": right.id,
-            "plan_id": right.plan_id,
-            "clip_type": right.clip_type,
-            "order": right.order,
-            "duration": right.duration,
-            "start_time": right.start_time,
-        },
+        "left_clip": _clip_to_response(left, asset_url=url_map.get(getattr(left, "asset_id", "") or "")),
+        "right_clip": _clip_to_response(right, asset_url=url_map.get(getattr(right, "asset_id", "") or "")),
     }
 
 
-@router.post("/clips/merge", response_model=dict[str, Any], status_code=status.HTTP_200_OK)
+@router.post("/clips/merge", status_code=status.HTTP_200_OK)
 def merge_draft_clips(
     template_id: str,
     body: MergeClipsRequest,
     plan_id: str = Depends(get_draft_plan_id),
     services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
+    asset_repo: SQLAlchemyAssetRepository = Depends(get_asset_repository),
     _: AuthenticatedUser = Depends(get_current_user),
 ):
     """将多个连续的同类型片段合并为一个片段"""
@@ -230,13 +307,11 @@ def merge_draft_clips(
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)
         ) from exc
+    asset_id = getattr(merged, "asset_id", "") or ""
+    url_map = _build_asset_url_map([asset_id], asset_repo) if asset_id else {}
     return {
-        "id": merged.id,
-        "plan_id": merged.plan_id,
-        "clip_type": merged.clip_type,
-        "order": merged.order,
-        "duration": merged.duration,
-        "text_content": merged.text_content,
+        "merged_clip": _clip_to_response(merged, asset_url=url_map.get(asset_id)),
+        "deleted_clip_ids": body.clip_ids,
     }
 
 

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

@@ -8,8 +8,9 @@
 
 from __future__ import annotations
 
+import json
 import logging
-from typing import Any
+from typing import Any, Optional
 
 from app.auth import AuthenticatedUser, get_current_user
 from app.core.celery_app import celery_app
@@ -45,6 +46,7 @@ from ._fallback import (
 from .dependencies import _check_queue_limits, get_draft_plan_id, get_editor_services
 from .schemas import (
     ClipStatusItem,
+    EditPlanGenerateRequest,
     EditPlanGenerateResponse,
     EditPlanGenerationsResponse,
     EditPlanGenerationStatusResponse,
@@ -57,6 +59,7 @@ router = APIRouter(tags=["Template Editor"])
 @router.post("/generate", response_model=EditPlanGenerateResponse)
 def generate_editor_draft(
     template_id: str,
+    request: Optional[EditPlanGenerateRequest] = None,
     plan_id: str = Depends(get_draft_plan_id),
     services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
     db: Session = Depends(get_db_session),
@@ -65,6 +68,7 @@ def generate_editor_draft(
     asset_repo: Any = Depends(get_asset_repository),
 ) -> EditPlanGenerateResponse:
     """触发模板草稿渲染生成"""
+    req = request or EditPlanGenerateRequest()
     _, plan_svc = services
     plan_check = plan_svc.get_plan_or_raise(plan_id)
 
@@ -85,6 +89,36 @@ def generate_editor_draft(
     # 检查是否可复用已完成的预览产物（预览品质已与正式一致）
     gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
     reusable_task = _find_reusable_preview_task(gen_task_repo, plan_id, plan_check)
+    if reusable_task:
+        # 复用预览产物：标记为正式产出，跳过渲染
+        # 如果前端传了 title_config，需要创建新任务（因为预览任务的 custom_title 可能不同）
+        title_config_reuse = req.title_config or {}
+        title_text_reuse = (title_config_reuse.get("text") or "").strip()
+        existing_custom_title = getattr(reusable_task, "custom_title", "") or ""
+        if title_text_reuse and existing_custom_title:
+            # 如果新标题和已有标题不同，不能复用，走新建任务流程
+            new_title_json = json.dumps(title_config_reuse, ensure_ascii=False)
+            if new_title_json != existing_custom_title:
+                logger.info(
+                    "[模板生成] 标题已变更，跳过复用: task_id=%s",
+                    reusable_task.id,
+                )
+                reusable_task = None
+        elif title_text_reuse and not existing_custom_title:
+            # 原来没标题，现在有标题，不能复用
+            logger.info(
+                "[模板生成] 新增标题，跳过复用: task_id=%s",
+                reusable_task.id,
+            )
+            reusable_task = None
+        elif not title_text_reuse and existing_custom_title:
+            # 原来有标题，现在移除了，不能复用
+            logger.info(
+                "[模板生成] 移除标题，跳过复用: task_id=%s",
+                reusable_task.id,
+            )
+            reusable_task = None
+
     if reusable_task:
         # 复用预览产物：标记为正式产出，跳过渲染
         reusable_task.mark_confirmed()
@@ -133,6 +167,21 @@ def generate_editor_draft(
         gen_task_use_case = CreateGenerationTaskUseCase(gen_task_repo)
         plan = plan_svc.get_plan_or_raise(plan_id)
         config_asset_ids = (plan.config or {}).get("asset_ids", [])
+        # 从 plan config 读取封面 URL（由 generate-cover 保存）
+        cover_url_from_config = (plan.config or {}).get("cover", {}).get("image_url", "")
+
+        # 处理标题配置：序列化 title_config 为 JSON 存入 custom_title
+        title_config = req.title_config or {}
+        title_text = (title_config.get("text") or "").strip()
+        custom_title_value = ""
+        if title_text:
+            custom_title_value = json.dumps(title_config, ensure_ascii=False)
+            logger.info(
+                "[模板生成] 标题配置: text=%s, config_keys=%s",
+                title_text[:30],
+                list(title_config.keys()),
+            )
+
         gen_task = gen_task_use_case.execute(
             CreateGenerationTaskCommand(
                 project_id=plan.project_id or "",
@@ -140,6 +189,8 @@ def generate_editor_draft(
                 created_by_user_id=current_user.user.id,
                 source_edit_plan_id=plan_id,
                 asset_ids=list(config_asset_ids) if config_asset_ids else [],
+                cover_url=cover_url_from_config,
+                custom_title=custom_title_value,
             ),
         )
 

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

@@ -6,7 +6,7 @@
 from __future__ import annotations
 
 import re as _re
-from typing import Any, List, Optional
+from typing import Any, Dict, List, Optional
 
 from app.schemas.generation_task import GenerationTaskResponse
 from pydantic import BaseModel, Field, validator
@@ -44,6 +44,14 @@ class EditPlanGenerationStatusResponse(BaseModel):
     clips: List[ClipStatusItem]
 
 
+class EditPlanGenerateRequest(BaseModel):
+    """模板编辑器触发生成请求体"""
+    title_config: Optional[Dict[str, Any]] = Field(
+        default_factory=dict,
+        description="标题配置（可选），渲染时烧录到视频中。支持字段: text/font/font_size/font_color/position/bold/stroke/shadow",
+    )
+
+
 class EditPlanGenerateResponse(BaseModel):
     """剪辑计划触发生成响应体"""
 
@@ -227,6 +235,7 @@ class ClipsFromAssetsResponse(BaseModel):
 
     success: bool = True
     created_count: int
+    plan_id: str = ""
     message: str = ""
     clip_ids: List[str] = Field(default_factory=list, description="创建的片段ID列表")
 
@@ -439,17 +448,28 @@ class EditorUpdateRequest(BaseModel):
 
 
 class EditorClipResponse(BaseModel):
-    """片段响应"""
+    """片段响应 — 与数据库 edit_plan_clips 表字段对齐"""
 
     id: str
     plan_id: str
     clip_type: str
     order: int
     duration: float
+    start_time: float = 0.0
     text_content: str = ""
     transition_effect: str = "cut"
+    transition_duration: float = 0.0
     playback_speed: float = 1.0
+    asset_id: str = ""
+    asset_url: str | None = Field(
+        default=None,
+        description="素材视频签名URL（1小时有效），用于前端预览播放",
+    )
+    status: str = "pending"
+    template_clip_config_id: str = ""
     config: dict[str, Any] = Field(default_factory=dict)
+    created_at: str = ""
+    updated_at: str = ""
 
 
 class EditorClipListResponse(BaseModel):

apps/web/src/api/auth/tokenRefresh.ts

@@ -0,0 +1,82 @@
+/**
+ * 主动 Token 刷新模块
+ *
+ * 在 access_token 过期前主动刷新，避免 API 请求触发 401。
+ * JWT payload 是 base64 编码的 JSON，无需第三方库即可解码。
+ */
+import { useAuthStore } from "@/store/authStore"
+import { refreshAccessToken } from "./login"
+
+let refreshTimer: ReturnType<typeof setTimeout> | null = null
+
+/** 提前刷新的缓冲时间（秒） */
+const REFRESH_BUFFER_SECONDS = 60
+
+/**
+ * 解码 JWT payload（不验签，仅读取 exp 字段）
+ */
+function decodeJwtPayload(token: string): { exp?: number } | null {
+  try {
+    const parts = token.split(".")
+    if (parts.length !== 3) return null
+    // JWT 使用 base64url 编码，需要转换为标准 base64
+    const payload = parts[1].replace(/-/g, "+").replace(/_/g, "/")
+    const padded = payload + "=".repeat((4 - (payload.length % 4)) % 4)
+    const decoded = atob(padded)
+    return JSON.parse(decoded)
+  } catch {
+    return null
+  }
+}
+
+/**
+ * 取消已调度的主动刷新
+ */
+export function cancelProactiveRefresh(): void {
+  if (refreshTimer) {
+    clearTimeout(refreshTimer)
+    refreshTimer = null
+  }
+}
+
+/**
+ * 调度主动刷新：在 token 过期前 REFRESH_BUFFER_SECONDS 秒自动刷新
+ */
+export function scheduleProactiveRefresh(): void {
+  cancelProactiveRefresh()
+
+  const accessToken = localStorage.getItem("access_token")
+  const refreshTokenValue = useAuthStore.getState().refreshToken
+
+  if (!accessToken || !refreshTokenValue) return
+
+  const payload = decodeJwtPayload(accessToken)
+  if (!payload?.exp) return
+
+  const now = Math.floor(Date.now() / 1000)
+  const secondsUntilExpiry = payload.exp - now
+
+  // 如果 token 已经过期或即将在缓冲时间内过期，立即刷新
+  const delaySeconds = Math.max(secondsUntilExpiry - REFRESH_BUFFER_SECONDS, 0)
+
+  refreshTimer = setTimeout(async () => {
+    try {
+      const data = await refreshAccessToken(refreshTokenValue)
+      const newAccessToken = data.access_token
+      const newRefreshToken = data.refresh_token ?? refreshTokenValue
+
+      // 更新 Zustand store + localStorage
+      useAuthStore
+        .getState()
+        .setAuth(useAuthStore.getState().user!, newAccessToken, newRefreshToken)
+
+      // 递归调度下一次刷新
+      scheduleProactiveRefresh()
+    } catch {
+      // 刷新失败 → 清除认证状态，跳转登录页
+      cancelProactiveRefresh()
+      useAuthStore.getState().clearAuth()
+      window.location.href = "/login"
+    }
+  }, delaySeconds * 1000)
+}

apps/web/src/api/client.ts

@@ -6,6 +6,7 @@ import axios, { AxiosError, InternalAxiosRequestConfig } from "axios"
 import { message } from "antd"
 import { useAuthStore } from "@/store/authStore"
 import { refreshAccessToken } from "./auth"
+import { scheduleProactiveRefresh, cancelProactiveRefresh } from "./auth/tokenRefresh"
 
 // 创建 Axios 实例
 const apiClient = axios.create({
@@ -109,6 +110,9 @@ apiClient.interceptors.response.use(
         // 处理排队的请求
         processQueue(null, newAccessToken)
 
+        // 重新调度主动刷新（基于新 token 的过期时间）
+        scheduleProactiveRefresh()
+
         // 重试原始请求
         if (originalRequest.headers) {
           originalRequest.headers.Authorization = `Bearer ${newAccessToken}`
@@ -116,6 +120,7 @@ apiClient.interceptors.response.use(
         return apiClient(originalRequest)
       } catch (refreshError) {
         // 刷新失败 → 登出
+        cancelProactiveRefresh()
         processQueue(refreshError, null)
         useAuthStore.getState().clearAuth()
         window.location.href = "/"

apps/web/src/hooks/useAuth.ts

@@ -4,6 +4,7 @@
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query"
 import { useNavigate } from "react-router-dom"
 import * as authApi from "@/api/auth"
+import { scheduleProactiveRefresh, cancelProactiveRefresh } from "@/api/auth/tokenRefresh"
 import { useAuthStore } from "@/store/authStore"
 
 // 登录 Hook
@@ -31,6 +32,9 @@ export const useLogin = () => {
     const user = await authApi.getCurrentUser()
     setAuth(user, data.access_token, refreshToken)
 
+    // 启动主动 token 刷新，避免后续请求触发 401
+    scheduleProactiveRefresh()
+
     // 跳转到登录前页面或仪表盘（与 Login.tsx onFinish 保持一致）
     const redirect = localStorage.getItem("login_redirect") || "/app/dashboard"
     localStorage.removeItem("login_redirect")
@@ -73,6 +77,9 @@ export const useWechatCallback = () => {
     const user = await authApi.getCurrentUser()
     setAuth(user, result.access_token, result.refresh_token)
 
+    // 启动主动 token 刷新
+    scheduleProactiveRefresh()
+
     return { ...result, user }
   }
 
@@ -121,6 +128,7 @@ export const useLogout = () => {
     } catch (error) {
       // 即使登出失败也清除本地状态
     } finally {
+      cancelProactiveRefresh()
       clearAuth()
       queryClient.clear()
       navigate("/")

apps/web/src/main.tsx

@@ -9,6 +9,13 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query"
 import { ConfigProvider, App as AntApp } from "antd"
 import zhCN from "antd/locale/zh_CN"
 import router from "./router"
+import { scheduleProactiveRefresh } from "./api/auth/tokenRefresh"
+
+// 应用启动时，如果用户已登录，立即调度主动 token 刷新
+// 这样可以在 token 过期前自动刷新，避免 API 请求触发 401
+if (localStorage.getItem("access_token")) {
+  scheduleProactiveRefresh()
+}
 import "./index.css"
 import "./styles/global.css"
 

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

@@ -1,15 +1,15 @@
 /**
- * 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 → 选择标题 → 生成预览 → 选择封面 → 确认生成
+ * 智能剪辑页面 — V24 前端预览播放器架构改造
+ * 7 步向导：选择模板 → 素材 → 配音 → 标题 → 预览 → 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
- * 步骤导航 → hooks/useStepNavigation
- * 步骤内容 → components/GenerateStepContent
- * 底部按钮 → components/GenerateStepActions
- * 生成核心逻辑 → hooks/useGenerateVideo
+ *
+ * 架构改造：
+ * - Step5 预览改为前端素材切片播放（FrontendPreviewPlayer）
+ * - 完全去除后端 FFmpeg 预览依赖
+ * - 标题样式通过 CSS 层实时叠加，所见即所得
+ * - 最终成片仍走后端 FFmpeg 渲染（Step7 确认生成）
  */
-import React, { useState, useMemo } from "react"
+import React, { useMemo } from "react"
 import { Modal, message } from "antd"
 import { useNavigate } from "react-router-dom"
 import type { VoiceClone } from "@/api/voice-clone"
@@ -24,7 +24,8 @@ import GenerateStepActions from "./components/GenerateStepActions"
 import { useGenerateFormState } from "./hooks/useGenerateFormState"
 import { useStepNavigation } from "./hooks/useStepNavigation"
 import { useGenerateVideo } from "./hooks/useGenerateVideo"
-import { useStep5Preview } from "./hooks/useStep5Preview"
+import { usePreviewAssets } from "./hooks/usePreviewAssets"
+import { useTitleStyleUpdaters } from "./hooks/useStep4Title/useTitleStyleUpdaters"
 import "./generate.css"
 
 const GeneratePage: React.FC = () => {
@@ -71,6 +72,12 @@ const GeneratePage: React.FC = () => {
     setPreviewModalOpen,
   } = formState
 
+  /* ── 标题样式回调（Step5 样式面板 + 右侧预览 CSS 层共用） ── */
+  const styleUpdaters = useTitleStyleUpdaters({
+    titleSettings,
+    onTitleSettingsChange: setTitleSettings,
+  })
+
   /* ── 克隆声音 ── */
   const { clones: clonedVoices, addClone, hasProcessing } = useCloneProgress()
 
@@ -80,36 +87,23 @@ const GeneratePage: React.FC = () => {
     message.success("音色克隆成功！")
   }
 
-  /* ── 预览数量（多预览） ── */
-  const [previewCount, setPreviewCount] = useState(1)
+  /* ── 前端预览：加载选中素材的视频文件信息 ── */
+  const previewAssetIds = useMemo(
+    () => (materialMode === "auto" ? smartSelectedIds : selectedMaterials),
+    [materialMode, smartSelectedIds, selectedMaterials],
+  )
+  const previewAssetsEnabled = currentStep >= 4 && previewAssetIds.length > 0
+  const {
+    assets: previewAssets,
+    loading: previewAssetsLoading,
+    ready: previewAssetsReady,
+  } = usePreviewAssets(previewAssetIds, previewAssetsEnabled)
 
-  /* ── 根据 voiceMode 构建 voiceIds 传给预览接口 ── */
-  /* selectedVoice / selectedClonedVoice 均为 string 类型（voice ID），
-     见 useGenerateFormState 返回值类型定义 */
-  const previewVoiceIds = useMemo((): string[] => {
-    if (voiceMode === "clone") {
-      const id: string = selectedClonedVoice
-      return id ? [id] : []
-    }
-    // preset / custom 模式
-    const id: string = selectedVoice
-    return id ? [id] : []
-  }, [voiceMode, selectedVoice, selectedClonedVoice])
-
-  /* ── Step5 预览生成（多预览 + voice_ids） ── */
-  const step5Preview = useStep5Preview({
-    templates: userTemplates,
-    selectedTemplate,
-    materialMode,
-    selectedMaterials,
-    smartSelectedIds,
-    duration,
-    videoRatio,
-    voiceIds: previewVoiceIds,
-    voiceLibraryId: selectedVoice || undefined,
-    previewCount,
-    titleSettings,
-  })
+  /* ── 当前模板对象（传给前端预览播放器） ── */
+  const currentTemplate = useMemo(
+    () => userTemplates.find((t) => t.id === selectedTemplate) || null,
+    [userTemplates, selectedTemplate],
+  )
 
   /* ── 步骤导航 ── */
   const { goNext, goPrev } = useStepNavigation({
@@ -120,7 +114,7 @@ const GeneratePage: React.FC = () => {
     selectedMaterials,
     smartSelectedIds,
     titleSettings,
-    previewReady: step5Preview.canProceed,
+    previewReady: previewAssetsReady,
   })
 
   /* ── 视频生成核心逻辑 ── */
@@ -151,7 +145,7 @@ const GeneratePage: React.FC = () => {
     autoSubtitles,
     bgm,
     generateCount,
-    previewTaskId: step5Preview.selectedTaskId,
+    previewTaskId: "",
   })
 
   /* ================================================================
@@ -183,6 +177,17 @@ const GeneratePage: React.FC = () => {
             onSmartSelectedIdsChange={setSmartSelectedIds}
             titleSettings={titleSettings}
             onTitleSettingsChange={setTitleSettings}
+            /* 标题样式回调 */
+            onUpdatePosition={styleUpdaters.updatePosition}
+            onUpdateFont={styleUpdaters.updateFont}
+            onUpdateSize={styleUpdaters.updateSize}
+            onToggleBold={styleUpdaters.toggleBold}
+            onToggleItalic={styleUpdaters.toggleItalic}
+            onToggleStroke={styleUpdaters.toggleStroke}
+            onToggleShadow={styleUpdaters.toggleShadow}
+            onApplyPreset={styleUpdaters.applyPreset}
+            activePreset={styleUpdaters.activePreset}
+            titlePresets={styleUpdaters.titlePresets}
             coverSettings={coverSettings}
             onCoverSettingsChange={setCoverSettings}
             duration={duration}
@@ -207,19 +212,6 @@ const GeneratePage: React.FC = () => {
             onRetry={handleRetryGenerate}
             onDismissError={handleDismissError}
             presetVoices={presetVoices}
-            videoRatio={videoRatio}
-            /* Step5 多预览 */
-            previewCount={previewCount}
-            onPreviewCountChange={setPreviewCount}
-            previewItems={step5Preview.items}
-            previewSelectedIndex={step5Preview.selectedIndex}
-            onSelectPreview={step5Preview.setSelectedIndex}
-            previewOverallStatus={step5Preview.previewStatus}
-            previewOverallError={step5Preview.previewError}
-            previewOverallProgress={step5Preview.progress}
-            previewAnyGenerating={step5Preview.anyGenerating}
-            onGeneratePreview={step5Preview.generatePreview}
-            onRegeneratePreview={step5Preview.regeneratePreview}
           />
 
           <GenerateStepActions
@@ -235,15 +227,15 @@ 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+ 显示） */}
+          {/* 预览视频面板（Step4+ 显示，含 CSS 标题实时预览层） */}
           {currentStep >= 4 && (
             <PreviewVideoPanel
-              previewStatus={step5Preview.previewStatus}
-              previewResult={step5Preview.previewResult}
-              previewError={step5Preview.previewError}
-              progress={step5Preview.progress}
+              assets={previewAssets}
+              template={currentTemplate}
               videoRatio={videoRatio}
-              onRegenerate={step5Preview.regeneratePreview}
+              assetsReady={previewAssetsReady}
+              assetsLoading={previewAssetsLoading}
+              titleSettings={titleSettings}
             />
           )}
           {currentStep >= 6 && (

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

@@ -0,0 +1,300 @@
+/**
+ * 前端预览播放器
+ * 用原生 <video> 标签按时间线播放素材片段
+ * 替代后端 FFmpeg 渲染预览，实现真正的实时预览
+ */
+import React, { useMemo, useCallback, useState, useRef, useEffect } from "react"
+import { PlayCircleOutlined, PauseCircleOutlined, SoundOutlined } from "@ant-design/icons"
+import type { AssetItem } from "@/api/assets"
+import type { EditingTemplate } from "@/api/editing-planner"
+import { useSegmentScheduler, type PlaybackSegment } from "../hooks/useSegmentScheduler"
+
+interface FrontendPreviewPlayerProps {
+  /** 选中的素材列表 */
+  assets: AssetItem[]
+  /** 当前模板（用于获取片段时长配置） */
+  template: EditingTemplate | null
+  /** 视频比例 */
+  videoRatio: string
+  /** 是否准备好播放（素材已加载） */
+  ready: boolean
+}
+
+/** 格式化时间 mm:ss */
+function formatTime(seconds: number): string {
+  const m = Math.floor(seconds / 60)
+  const s = Math.floor(seconds % 60)
+  return `${m}:${s.toString().padStart(2, "0")}`
+}
+
+/**
+ * 将素材映射为播放片段
+ * 每个素材对应一个模板片段，按顺序分配
+ */
+function buildPlaybackSegments(
+  assets: AssetItem[],
+  template: EditingTemplate | null,
+): PlaybackSegment[] {
+  if (!assets.length) return []
+
+  const templateSegments = template?.segments || []
+  const segments: PlaybackSegment[] = []
+
+  assets.forEach((asset, i) => {
+    // 获取素材时长（从 metadata 或顶层字段）
+    const assetDuration = asset.duration || asset.metadata?.duration || 30
+    // 模板片段的时长约束
+    const tplSeg = templateSegments[i] || templateSegments[templateSegments.length - 1]
+    const segDuration = tplSeg
+      ? Math.min(tplSeg.duration_max, Math.max(tplSeg.duration_min, assetDuration))
+      : Math.min(assetDuration, 10)
+
+    const startTime = 0
+    const endTime = Math.min(startTime + segDuration, assetDuration)
+
+    segments.push({
+      assetId: asset.id,
+      videoUrl: asset.file_url || asset.storage_key,
+      startTime,
+      endTime,
+      order: i,
+    })
+  })
+
+  return segments
+}
+
+const FrontendPreviewPlayer: React.FC<FrontendPreviewPlayerProps> = ({
+  assets,
+  template,
+  videoRatio,
+  ready,
+}) => {
+  // 构建播放片段
+  const segments = useMemo(() => buildPlaybackSegments(assets, template), [assets, template])
+
+  const {
+    isPlaying,
+    currentTime,
+    totalDuration,
+    currentSegmentIndex,
+    isEnded,
+    canPlay,
+    togglePlayPause,
+    seekTo,
+    videoRef,
+  } = useSegmentScheduler(segments)
+
+  // 进度条拖拽
+  const [isDragging, setIsDragging] = useState(false)
+  const progressRef = useRef<HTMLDivElement>(null)
+
+  const handleProgressClick = useCallback(
+    (e: React.MouseEvent<HTMLDivElement>) => {
+      if (!progressRef.current || totalDuration <= 0) return
+      const rect = progressRef.current.getBoundingClientRect()
+      const ratio = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width))
+      seekTo(ratio * totalDuration)
+    },
+    [totalDuration, seekTo],
+  )
+
+  const handleMouseDown = useCallback(
+    (e: React.MouseEvent<HTMLDivElement>) => {
+      setIsDragging(true)
+      handleProgressClick(e)
+    },
+    [handleProgressClick],
+  )
+
+  useEffect(() => {
+    if (!isDragging) return
+    const handleMouseMove = (e: MouseEvent) => {
+      if (!progressRef.current || totalDuration <= 0) return
+      const rect = progressRef.current.getBoundingClientRect()
+      const ratio = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width))
+      seekTo(ratio * totalDuration)
+    }
+    const handleMouseUp = () => setIsDragging(false)
+    window.addEventListener("mousemove", handleMouseMove)
+    window.addEventListener("mouseup", handleMouseUp)
+    return () => {
+      window.removeEventListener("mousemove", handleMouseMove)
+      window.removeEventListener("mouseup", handleMouseUp)
+    }
+  }, [isDragging, totalDuration, seekTo])
+
+  const videoAspectStyle = { aspectRatio: (videoRatio || "16:9").replace(":", "/") }
+  const progressPercent = totalDuration > 0 ? (currentTime / totalDuration) * 100 : 0
+
+  // 未就绪状态
+  if (!ready || !assets.length) {
+    return (
+      <div className="xx-preview-empty">
+        <SoundOutlined style={{ fontSize: 48, color: "var(--text-tertiary)", marginBottom: 12 }} />
+        <p className="xx-preview-empty-title">准备预览素材...</p>
+        <p className="xx-preview-empty-desc">加载素材后即可预览播放</p>
+      </div>
+    )
+  }
+
+  // 无播放片段
+  if (!canPlay) {
+    return (
+      <div className="xx-preview-empty">
+        <PlayCircleOutlined
+          style={{ fontSize: 48, color: "var(--text-tertiary)", marginBottom: 12 }}
+        />
+        <p className="xx-preview-empty-title">暂无可播放素材</p>
+        <p className="xx-preview-empty-desc">请先在左侧选择素材</p>
+      </div>
+    )
+  }
+
+  return (
+    <div className="xx-frontend-preview-player">
+      {/* 视频区域 */}
+      <div className="xx-preview-video" style={{ ...videoAspectStyle, position: "relative" }}>
+        <video
+          ref={videoRef}
+          preload="auto"
+          style={{
+            width: "100%",
+            height: "100%",
+            objectFit: "contain",
+            background: "#000",
+          }}
+          playsInline
+        />
+
+        {/* 播放/暂停按钮覆盖 */}
+        {!isPlaying && (
+          <button
+            className="xx-preview-play-btn"
+            onClick={togglePlayPause}
+            style={{
+              position: "absolute",
+              top: "50%",
+              left: "50%",
+              transform: "translate(-50%, -50%)",
+              background: "rgba(0,0,0,0.5)",
+              border: "none",
+              borderRadius: "50%",
+              width: 56,
+              height: 56,
+              cursor: "pointer",
+              display: "flex",
+              alignItems: "center",
+              justifyContent: "center",
+              color: "#fff",
+              fontSize: 28,
+              zIndex: 10,
+              transition: "opacity 0.2s",
+            }}
+          >
+            {isEnded ? <PlayCircleOutlined /> : <PlayCircleOutlined />}
+          </button>
+        )}
+
+        {/* 当前片段指示器 */}
+        <div
+          style={{
+            position: "absolute",
+            top: 8,
+            left: 8,
+            background: "rgba(0,0,0,0.6)",
+            color: "#fff",
+            fontSize: 11,
+            padding: "2px 8px",
+            borderRadius: 4,
+            zIndex: 10,
+          }}
+        >
+          片段 {currentSegmentIndex + 1}/{segments.length}
+        </div>
+      </div>
+
+      {/* 控制条 */}
+      <div
+        className="xx-preview-controls"
+        style={{
+          display: "flex",
+          alignItems: "center",
+          gap: 8,
+          padding: "8px 0",
+        }}
+      >
+        {/* 播放/暂停 */}
+        <button
+          onClick={togglePlayPause}
+          style={{
+            background: "none",
+            border: "none",
+            color: "var(--text-primary, #fff)",
+            fontSize: 18,
+            cursor: "pointer",
+            padding: 4,
+            display: "flex",
+            alignItems: "center",
+          }}
+        >
+          {isPlaying ? <PauseCircleOutlined /> : <PlayCircleOutlined />}
+        </button>
+
+        {/* 时间 */}
+        <span
+          style={{
+            fontSize: 12,
+            color: "var(--text-secondary, #999)",
+            minWidth: 80,
+            fontVariantNumeric: "tabular-nums",
+          }}
+        >
+          {formatTime(currentTime)} / {formatTime(totalDuration)}
+        </span>
+
+        {/* 进度条 */}
+        <div
+          ref={progressRef}
+          onMouseDown={handleMouseDown}
+          style={{
+            flex: 1,
+            height: 4,
+            background: "rgba(255,255,255,0.15)",
+            borderRadius: 2,
+            cursor: "pointer",
+            position: "relative",
+          }}
+        >
+          <div
+            style={{
+              height: "100%",
+              width: `${progressPercent}%`,
+              background: "#3b82f6",
+              borderRadius: 2,
+              transition: isDragging ? "none" : "width 0.1s linear",
+            }}
+          />
+          {/* 进度指示点 */}
+          <div
+            style={{
+              position: "absolute",
+              top: "50%",
+              left: `${progressPercent}%`,
+              transform: "translate(-50%, -50%)",
+              width: 10,
+              height: 10,
+              borderRadius: "50%",
+              background: "#3b82f6",
+              border: "2px solid #fff",
+              opacity: isDragging ? 1 : 0,
+              transition: "opacity 0.15s",
+            }}
+          />
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export default FrontendPreviewPlayer

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

@@ -2,6 +2,8 @@
  * 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) → 标题(4) → 预览(5) → 封面(6) → 确认(7)
+ *
+ * V24: 移除 Step5 预览生成相关 props，改为纯标题样式编辑
  */
 import React from "react"
 import type { EditingTemplate } from "@/api/editing-planner"
@@ -9,7 +11,6 @@ import type { PresetVoiceItem } from "@/api/voices"
 import type { VoiceClone } from "@/api/voice-clone"
 import type { CoverConfig } from "../types/cover"
 import type { TitleSettings } from "../types"
-import type { PreviewItem, PreviewStatus } from "../hooks/useStep5Preview"
 import Step1TemplateSelect from "../components/Step1TemplateSelect"
 import Step2MaterialSelect from "../components/Step2MaterialSelect"
 import Step3VoiceSelect from "../components/Step5VoiceSelect"
@@ -35,6 +36,17 @@ export interface GenerateStepContentProps {
   /* 标题 */
   titleSettings: TitleSettings
   onTitleSettingsChange: (settings: TitleSettings) => void
+  /* 标题样式回调 — Step5 样式面板使用 */
+  onUpdatePosition: (position: string) => void
+  onUpdateFont: (font: string) => void
+  onUpdateSize: (size: number) => void
+  onToggleBold: () => void
+  onToggleItalic: () => void
+  onToggleStroke: () => void
+  onToggleShadow: () => void
+  onApplyPreset: (presetKey: string) => void
+  activePreset: string | null
+  titlePresets: { key: string; label: string; previewStyle: React.CSSProperties }[]
   /* 封面 */
   coverSettings: CoverConfig
   onCoverSettingsChange: (settings: CoverConfig) => void
@@ -63,19 +75,6 @@ export interface GenerateStepContentProps {
   onDismissError: () => void
   /* 其他 */
   presetVoices: PresetVoiceItem[]
-  videoRatio: string
-  /* Step4 预览（多预览） */
-  previewCount: number
-  onPreviewCountChange: (count: number) => void
-  previewItems: PreviewItem[]
-  previewSelectedIndex: number
-  onSelectPreview: (index: number) => void
-  previewOverallStatus: PreviewStatus
-  previewOverallError: string
-  previewOverallProgress: number
-  previewAnyGenerating: boolean
-  onGeneratePreview: () => void
-  onRegeneratePreview: () => void
 }
 
 export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) => {
@@ -92,6 +91,16 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
     onSmartSelectedIdsChange,
     titleSettings,
     onTitleSettingsChange,
+    onUpdatePosition,
+    onUpdateFont,
+    onUpdateSize,
+    onToggleBold,
+    onToggleItalic,
+    onToggleStroke,
+    onToggleShadow,
+    onApplyPreset,
+    activePreset,
+    titlePresets,
     coverSettings,
     onCoverSettingsChange,
     duration,
@@ -110,18 +119,6 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
     onRetry,
     onDismissError,
     presetVoices,
-    videoRatio,
-    previewCount,
-    onPreviewCountChange,
-    previewItems,
-    previewSelectedIndex,
-    onSelectPreview,
-    previewOverallStatus,
-    previewOverallError,
-    previewOverallProgress,
-    previewAnyGenerating,
-    onGeneratePreview,
-    onRegeneratePreview,
   } = props
 
   switch (currentStep) {
@@ -161,18 +158,17 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
     case 5:
       return (
         <Step5GeneratePreview
-          videoRatio={videoRatio}
-          previewCount={previewCount}
-          onPreviewCountChange={onPreviewCountChange}
-          items={previewItems}
-          selectedIndex={previewSelectedIndex}
-          onSelectPreview={onSelectPreview}
-          overallStatus={previewOverallStatus}
-          overallError={previewOverallError}
-          overallProgress={previewOverallProgress}
-          anyGenerating={previewAnyGenerating}
-          onGeneratePreview={onGeneratePreview}
-          onRegeneratePreview={onRegeneratePreview}
+          titleSettings={titleSettings}
+          onUpdatePosition={onUpdatePosition}
+          onUpdateFont={onUpdateFont}
+          onUpdateSize={onUpdateSize}
+          onToggleBold={onToggleBold}
+          onToggleItalic={onToggleItalic}
+          onToggleStroke={onToggleStroke}
+          onToggleShadow={onToggleShadow}
+          onApplyPreset={onApplyPreset}
+          activePreset={activePreset}
+          titlePresets={titlePresets}
         />
       )
     case 6:

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

@@ -1,117 +1,213 @@
 /**
  * 右侧预览视频面板
  * Step4+: 显示预览视频面板
- * Step5+: 显示后端生成的预览视频（标题已由 FFmpeg 烧录）
+ * Step5: 前端实时预览 — 用原生 video 播放素材片段 + CSS 标题叠加
  *
- * 设计说明：
- * - Step4（标题设置页）：右侧显示空状态提示，引导用户输入标题
- * - Step5（预览生成页）：显示后端返回的预览视频
- * - Canvas 预览已删除（统一由后端 FFmpeg 渲染标题）
+ * 架构改造：完全去除后端 FFmpeg 预览依赖
+ * - 使用 FrontendPreviewPlayer 直接播放素材片段
+ * - TitleOverlay CSS 层实时响应标题样式变化
  */
-import React from "react"
-import { PlayCircleOutlined, LoadingOutlined } from "@ant-design/icons"
-import type { PreviewResult, PreviewStatus } from "../hooks/useStep5Preview"
+import React, { useMemo } from "react"
+import { LoadingOutlined } from "@ant-design/icons"
+import type { AssetItem } from "@/api/assets"
+import type { EditingTemplate } from "@/api/editing-planner"
+import type { TitleSettings } from "../types"
+import FrontendPreviewPlayer from "./FrontendPreviewPlayer"
 
 interface PreviewVideoPanelProps {
-  previewStatus: PreviewStatus
-  previewResult: PreviewResult | null
-  previewError: string
-  progress: number
+  /** 已加载的素材列表 */
+  assets: AssetItem[]
+  /** 当前模板 */
+  template: EditingTemplate | null
+  /** 视频比例 */
   videoRatio: string
-  onRegenerate: () => void
+  /** 素材是否已加载就绪 */
+  assetsReady: boolean
+  /** 素材是否正在加载 */
+  assetsLoading: boolean
+  /** 标题设置 — 用于 CSS 实时预览层 */
+  titleSettings?: TitleSettings
 }
 
-/* ── 组件 ── */
+/* ── ASS 坐标系参数（与后端 ass_subtitle_builder.py 一致） ── */
+const ASS_VIDEO_HEIGHT = 720
+const ASS_TITLE_MARGIN_TOP = 60
+const ASS_TITLE_MARGIN_BOTTOM = 60
+const ASS_TITLE_MARGIN_SIDE = 40
+
+/**
+ * 根据 position 计算 CSS 垂直定位
+ * 与后端 position_to_ass_alignment() 对齐：top→8, center→5, bottom→2
+ */
+function getPositionStyle(position: string): React.CSSProperties {
+  const sidePercent = (ASS_TITLE_MARGIN_SIDE / 1280) * 100
+
+  switch (position) {
+    case "bottom":
+      return {
+        bottom: `${(ASS_TITLE_MARGIN_BOTTOM / ASS_VIDEO_HEIGHT) * 100}%`,
+        left: `${sidePercent}%`,
+        right: `${sidePercent}%`,
+        textAlign: "center",
+      }
+    case "center":
+      return {
+        top: "50%",
+        transform: "translateY(-50%)",
+        left: `${sidePercent}%`,
+        right: `${sidePercent}%`,
+        textAlign: "center",
+      }
+    case "top":
+    default:
+      return {
+        top: `${(ASS_TITLE_MARGIN_TOP / ASS_VIDEO_HEIGHT) * 100}%`,
+        left: `${sidePercent}%`,
+        right: `${sidePercent}%`,
+        textAlign: "center",
+      }
+  }
+}
+
+/**
+ * 构建 CSS 标题层的样式
+ * 所有渲染参数与后端 FFmpeg ASS 字幕一致
+ */
+function buildTitleStyle(settings: TitleSettings): React.CSSProperties {
+  const fontSizePercent = (Math.min(settings.size, 36) / ASS_VIDEO_HEIGHT) * 100
+
+  const base: React.CSSProperties = {
+    fontFamily: settings.font || "思源黑体",
+    fontSize: `${fontSizePercent}%`,
+    color: settings.color || "#ffffff",
+    fontWeight: settings.bold ? 700 : 400,
+    fontStyle: settings.italic ? "italic" : "normal",
+    lineHeight: 1.3,
+    wordBreak: "break-word",
+    pointerEvents: "none",
+    userSelect: "none",
+    paddingLeft: `${(ASS_TITLE_MARGIN_SIDE / 1280) * 100}%`,
+    paddingRight: `${(ASS_TITLE_MARGIN_SIDE / 1280) * 100}%`,
+  }
+
+  if (settings.stroke) {
+    base.WebkitTextStroke = "1px #000000"
+  }
+
+  if (settings.shadow) {
+    base.textShadow = "2px 2px 4px rgba(0,0,0,0.8)"
+  }
+
+  return base
+}
+
+/**
+ * CSS 标题预览覆盖层
+ */
+const TitleOverlay: React.FC<{ titleSettings: TitleSettings }> = ({ titleSettings }) => {
+  const positionStyle = useMemo(
+    () => getPositionStyle(titleSettings.position),
+    [titleSettings.position],
+  )
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const titleStyle = useMemo(
+    () => buildTitleStyle(titleSettings),
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+    [
+      titleSettings.font,
+      titleSettings.size,
+      titleSettings.color,
+      titleSettings.bold,
+      titleSettings.italic,
+      titleSettings.stroke,
+      titleSettings.shadow,
+    ],
+  )
+
+  if (!titleSettings.title?.trim()) return null
+
+  return (
+    <div
+      className="xx-preview-title-overlay"
+      style={{
+        position: "absolute",
+        inset: 0,
+        zIndex: 20,
+        pointerEvents: "none",
+      }}
+    >
+      <div
+        style={{
+          ...positionStyle,
+          ...titleStyle,
+          position: "absolute",
+        }}
+      >
+        {titleSettings.title}
+      </div>
+    </div>
+  )
+}
+
+/* ── 主组件 ── */
 
 export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
-  previewStatus,
-  previewResult,
-  previewError,
-  progress,
+  assets,
+  template,
   videoRatio,
-  onRegenerate,
+  assetsReady,
+  assetsLoading,
+  titleSettings,
 }) => {
-  const hasPreview = previewStatus === "ready" && previewResult
-  const isLoading = previewStatus === "pending" || previewStatus === "generating"
-  const isError = previewStatus === "error"
   const videoAspectStyle = { aspectRatio: (videoRatio || "16:9").replace(":", "/") }
 
   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>}
+        {assetsReady && assets.length > 0 && <span className="xx-preview-badge">实时预览</span>}
       </div>
 
-      {/* 空状态：还没生成预览 */}
-      {previewStatus === "idle" && (
-        <div className="xx-preview-empty">
-          <PlayCircleOutlined
-            style={{ fontSize: 48, color: "var(--text-tertiary)", marginBottom: 12 }}
-          />
-          <p className="xx-preview-empty-title">暂无预览</p>
-          <p className="xx-preview-empty-desc">在左侧生成预览后在此查看</p>
-        </div>
-      )}
-
-      {/* 生成中 */}
-      {isLoading && (
+      {/* 加载中 */}
+      {assetsLoading && (
         <div className="xx-preview-loading-panel">
           <div className="xx-preview-video" style={videoAspectStyle}>
             <div className="xx-preview-loading-center">
               <LoadingOutlined style={{ fontSize: 36, color: "#fff" }} spin />
               <p style={{ marginTop: 12, color: "rgba(255,255,255,0.8)", fontSize: 14 }}>
-                {previewStatus === "pending" ? "排队中..." : `生成中 ${progress}%`}
+                加载素材中...
               </p>
             </div>
           </div>
-          <div className="xx-preview-progress-bar-wrap">
-            <div className="xx-preview-progress-fill" style={{ width: `${progress}%` }} />
-          </div>
         </div>
       )}
 
-      {/* 生成失败 */}
-      {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>
-          </div>
-          <p className="xx-preview-error-msg">
-            {typeof previewError === "string" && previewError ? previewError : "请重试"}
-          </p>
-          <button className="xx-btn xx-btn-ghost xx-btn-block" onClick={onRegenerate}>
-            重新生成
-          </button>
+      {/* 前端预览播放器 + CSS 标题叠加 */}
+      {!assetsLoading && (
+        <div className="xx-preview-video" style={{ ...videoAspectStyle, position: "relative" }}>
+          <FrontendPreviewPlayer
+            assets={assets}
+            template={template}
+            videoRatio={videoRatio}
+            ready={assetsReady}
+          />
+          {/* CSS 标题实时预览层 — 与 FFmpeg ASS 渲染坐标对齐 */}
+          {titleSettings && <TitleOverlay titleSettings={titleSettings} />}
         </div>
       )}
 
-      {/* 预览成功 */}
-      {hasPreview && (
-        <>
-          <div className="xx-preview-video" style={videoAspectStyle}>
-            <video src={previewResult.videoUrl} controls preload="metadata" />
+      {/* 素材信息 */}
+      {assetsReady && assets.length > 0 && (
+        <div className="xx-preview-info">
+          <div className="xx-preview-info-row">
+            <span>素材数</span>
+            <span>{assets.length} 个</span>
           </div>
-          <div className="xx-preview-info">
-            <div className="xx-preview-info-row">
-              <span>时长</span>
-              <span>
-                {(typeof previewResult.duration === "number" ? previewResult.duration : 0).toFixed(
-                  1,
-                )}{" "}
-                秒
-              </span>
-            </div>
-            <div className="xx-preview-info-row">
-              <span>片段数</span>
-              <span>{previewResult.clipCount} 段</span>
-            </div>
-            <div className="xx-preview-info-row">
-              <span>比例</span>
-              <span>{videoRatio}</span>
-            </div>
+          <div className="xx-preview-info-row">
+            <span>比例</span>
+            <span>{videoRatio}</span>
           </div>
-        </>
+        </div>
       )}
     </div>
   )

apps/web/src/pages/generate/components/Step4TitleSettings.tsx

@@ -1,13 +1,13 @@
 /**
  * Step 4 标题设置组件
+ * 仅包含标题文字输入 + AI 标题生成
+ * 标题样式面板已迁移到 Step5（生成预览页面）
  */
 import React from "react"
 import { AutoComplete } from "antd"
-import { POSITION_OPTIONS, FONT_OPTIONS } from "../constants"
 import type { TitleSettings } from "../types"
 import { useStep4Title } from "../hooks/useStep4Title"
 import AiTitleGenerator from "./title/AiTitleGenerator"
-import TitleStylePanel from "./title/TitleStylePanel"
 
 interface Step4TitleSettingsProps {
   titleSettings: TitleSettings
@@ -110,23 +110,6 @@ const Step4TitleSettings: React.FC<Step4TitleSettingsProps> = (props) => {
           </div>
         </>
       )}
-
-      {/* 样式面板始终可见，两种模式下都可调整标题展示样式 */}
-      <TitleStylePanel
-        settings={t.titleSettings}
-        onUpdatePosition={t.updatePosition}
-        onUpdateFont={t.updateFont}
-        onUpdateSize={t.updateSize}
-        onToggleBold={t.toggleBold}
-        onToggleItalic={t.toggleItalic}
-        onToggleStroke={t.toggleStroke}
-        onToggleShadow={t.toggleShadow}
-        onApplyPreset={t.applyPreset}
-        activePreset={t.activePreset}
-        titlePresets={t.titlePresets}
-        POSITION_OPTIONS={POSITION_OPTIONS}
-        FONT_OPTIONS={FONT_OPTIONS}
-      />
     </div>
   )
 }

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

@@ -1,274 +1,82 @@
 /**
- * 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）
+ * Step 5 生成预览组件
+ * 架构改造：移除后端预览生成，改为前端实时预览
+ * 左侧仅保留标题样式面板，视频在右侧 PreviewVideoPanel 实时播放
  */
 import React from "react"
-import {
-  CheckCircleFilled,
-  LoadingOutlined,
-  ReloadOutlined,
-  PlayCircleOutlined,
-  ExclamationCircleFilled,
-  ClockCircleOutlined,
-} from "@ant-design/icons"
-import { InputNumber } from "antd"
-import type { PreviewItem, PreviewStatus } from "../hooks/useStep5Preview"
+import { PlayCircleOutlined } from "@ant-design/icons"
+import { POSITION_OPTIONS, FONT_OPTIONS } from "../constants"
+import type { TitleSettings } from "../types"
+import TitleStylePanel from "./title/TitleStylePanel"
 
 interface Step5GeneratePreviewProps {
-  videoRatio: string
-  previewCount: number
-  onPreviewCountChange: (count: number) => void
-  items: PreviewItem[]
-  selectedIndex: number
-  onSelectPreview: (index: number) => void
-  overallStatus: PreviewStatus
-  overallError: string
-  overallProgress: number
-  anyGenerating: boolean
-  onGeneratePreview: () => void
-  onRegeneratePreview: () => void
+  /* 标题样式 */
+  titleSettings: TitleSettings
+  onUpdatePosition: (position: string) => void
+  onUpdateFont: (font: string) => void
+  onUpdateSize: (size: number) => void
+  onToggleBold: () => void
+  onToggleItalic: () => void
+  onToggleStroke: () => void
+  onToggleShadow: () => void
+  onApplyPreset: (presetKey: string) => void
+  activePreset: string | null
+  titlePresets: { key: string; label: string; previewStyle: React.CSSProperties }[]
 }
 
-/** 预览数量选项 */
-const PREVIEW_COUNT_OPTIONS = [
-  { value: 1, label: "1个" },
-  { value: 2, label: "2个" },
-  { value: 3, label: "3个" },
-]
-
 const Step5GeneratePreview: React.FC<Step5GeneratePreviewProps> = ({
-  videoRatio,
-  previewCount,
-  onPreviewCountChange,
-  items,
-  selectedIndex,
-  onSelectPreview,
-  overallStatus,
-  overallError,
-  overallProgress,
-  anyGenerating,
-  onGeneratePreview,
-  onRegeneratePreview,
+  titleSettings,
+  onUpdatePosition,
+  onUpdateFont,
+  onUpdateSize,
+  onToggleBold,
+  onToggleItalic,
+  onToggleStroke,
+  onToggleShadow,
+  onApplyPreset,
+  activePreset,
+  titlePresets,
 }) => {
-  const aspectRatio = (videoRatio || "16:9").replace(":", "/") // "9:16" → "9/16", "16:9" → "16/9"
-  const isIdle = overallStatus === "idle"
-  const isError = overallStatus === "error" && !items.some((it) => it.status === "ready")
-
   return (
     <div className="xx-form-section">
-      <h3>🎬 生成预览</h3>
+      <h3>🎬 预览设置</h3>
 
-      {/* 预览数量选择器（仅在 idle 状态显示） */}
-      {isIdle && (
-        <div style={{ marginBottom: 16, display: "flex", alignItems: "center", gap: 12 }}>
-          <span style={{ fontSize: 14, color: "#666" }}>预览数量：</span>
-          <div style={{ display: "flex", gap: 8, alignItems: "center" }}>
-            {PREVIEW_COUNT_OPTIONS.map((opt) => (
-              <button
-                key={opt.value}
-                type="button"
-                onClick={() => onPreviewCountChange(opt.value)}
-                style={{
-                  padding: "4px 12px",
-                  borderRadius: 6,
-                  border: previewCount === opt.value ? "1px solid #1677ff" : "1px solid #d9d9d9",
-                  background: previewCount === opt.value ? "#e6f4ff" : "#fff",
-                  color: previewCount === opt.value ? "#1677ff" : "#666",
-                  cursor: "pointer",
-                  fontSize: 13,
-                  fontWeight: previewCount === opt.value ? 600 : 400,
-                }}
-              >
-                {opt.label}
-              </button>
-            ))}
-            <InputNumber
-              min={1}
-              max={10}
-              value={previewCount}
-              onChange={(val) => val && onPreviewCountChange(val)}
-              style={{ width: 70 }}
-              placeholder="自定义"
-            />
-            <span style={{ fontSize: 12, color: "#999", marginLeft: 4 }}>（1~10）</span>
-          </div>
-          {previewCount > 1 && (
-            <span style={{ fontSize: 12, color: "#999" }}>生成多个预览可对比不同剪辑效果</span>
-          )}
-        </div>
-      )}
+      {/* 前端实时预览提示 */}
+      <div
+        className="xx-preview-tip"
+        style={{
+          display: "flex",
+          alignItems: "center",
+          gap: 8,
+          padding: "12px 16px",
+          background: "rgba(59, 130, 246, 0.08)",
+          borderRadius: 8,
+          marginBottom: 16,
+          border: "1px solid rgba(59, 130, 246, 0.15)",
+        }}
+      >
+        <PlayCircleOutlined style={{ fontSize: 18, color: "#3b82f6" }} />
+        <span style={{ fontSize: 13, color: "var(--text-secondary, #666)" }}>
+          右侧面板直接播放素材片段，调整标题样式可实时预览效果
+        </span>
+      </div>
 
-      {/* 预览生成按钮（idle 状态） */}
-      {isIdle && (
-        <div className="xx-preview-generate-section">
-          <div className="xx-preview-generate-hint">
-            <PlayCircleOutlined style={{ fontSize: 32, color: "#3b82f6", marginBottom: 12 }} />
-            <p className="xx-preview-generate-title">一键生成剪辑预览</p>
-            <p className="xx-preview-generate-desc">
-              AI 将根据您选择的模板、素材和配音，智能生成
-              {previewCount > 1 ? `${previewCount}个不同版本的` : ""}视频预览（480p 低清版）
-            </p>
-          </div>
-          <button
-            className="xx-btn xx-btn-primary xx-preview-generate-btn"
-            onClick={onGeneratePreview}
-          >
-            ✨ 生成预览{previewCount > 1 ? `（${previewCount}个）` : ""}
-          </button>
-        </div>
-      )}
-
-      {/* 整体排队中（所有都在 pending） */}
-      {anyGenerating && items.every((it) => it.status === "pending") && (
-        <div className="xx-preview-loading">
-          <ClockCircleOutlined style={{ fontSize: 32, color: "#faad14" }} spin />
-          <p className="xx-preview-loading-text">预览排队中...</p>
-          <p className="xx-preview-loading-desc">正在等待渲染资源，请稍候</p>
-        </div>
-      )}
-
-      {/* 多预览网格（生成中/完成/部分完成） */}
-      {(anyGenerating || overallStatus === "ready") && items.length > 0 && (
-        <div
-          className="xx-preview-grid"
-          style={{
-            display: "grid",
-            gridTemplateColumns: `repeat(${Math.min(items.length, 3)}, 1fr)`,
-            gap: 12,
-            maxWidth: `${Math.min(items.length, 3) * 280 + (Math.min(items.length, 3) - 1) * 12}px`,
-            margin: "0 auto 16px",
-          }}
-        >
-          {items.map((item) => {
-            const isSelected = item.index === selectedIndex
-            return (
-              <div
-                key={item.index}
-                onClick={() => {
-                  if (item.status === "ready") onSelectPreview(item.index)
-                }}
-                style={{
-                  borderRadius: 8,
-                  border: isSelected ? "2px solid #1677ff" : "1px solid #e8e8e8",
-                  overflow: "hidden",
-                  cursor: item.status === "ready" ? "pointer" : "default",
-                  opacity: item.status === "error" ? 0.6 : 1,
-                  transition: "all 0.2s",
-                }}
-              >
-                {/* 轻量卡片：深色背景 + 状态指示 */}
-                <div
-                  style={{
-                    aspectRatio,
-                    background: "#1a1a2e",
-                    display: "flex",
-                    flexDirection: "column",
-                    alignItems: "center",
-                    justifyContent: "center",
-                    position: "relative",
-                    gap: 8,
-                  }}
-                >
-                  {/* 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" && (
-                    <ExclamationCircleFilled style={{ fontSize: 18, color: "#ef4444" }} />
-                  )}
-
-                  {/* 选中角标 */}
-                  {isSelected && item.status === "ready" && (
-                    <div
-                      style={{
-                        position: "absolute",
-                        top: 4,
-                        right: 4,
-                        background: "#1677ff",
-                        color: "#fff",
-                        fontSize: 10,
-                        padding: "2px 6px",
-                        borderRadius: 4,
-                      }}
-                    >
-                      预览 #{item.index + 1}
-                    </div>
-                  )}
-                </div>
-              </div>
-            )
-          })}
-        </div>
-      )}
-
-      {/* 整体进度条（多预览生成中） */}
-      {anyGenerating && (
-        <div className="xx-preview-progress-bar" style={{ marginBottom: 12 }}>
-          <div className="xx-preview-progress-fill" style={{ width: `${overallProgress}%` }} />
-        </div>
-      )}
-
-      {/* 全部完成提示 */}
-      {overallStatus === "ready" && (
-        <div className="xx-preview-tip">
-          <CheckCircleFilled style={{ color: "#52c41a", marginRight: 8 }} />
-          <span>
-            {items.filter((it) => it.status === "ready").length} 个预览生成成功
-            {items.length > 1 ? "，点击选择要查看的版本" : "，确认效果后进入下一步"}
-          </span>
-          <button
-            className="xx-preview-regenerate-btn"
-            onClick={onRegeneratePreview}
-            title="重新生成"
-          >
-            <ReloadOutlined /> 重新生成
-          </button>
-        </div>
-      )}
-
-      {/* 全部失败 */}
-      {isError && (
-        <div className="xx-preview-error">
-          <ExclamationCircleFilled style={{ fontSize: 28, color: "#ef4444" }} />
-          <p className="xx-preview-error-text">预览生成失败</p>
-          <p className="xx-preview-error-desc">
-            {typeof overallError === "string" && overallError ? overallError : "请稍后重试"}
-          </p>
-          <button className="xx-btn xx-btn-primary" onClick={onRegeneratePreview}>
-            <ReloadOutlined /> 重新生成
-          </button>
-        </div>
-      )}
+      {/* 标题样式面板 */}
+      <TitleStylePanel
+        settings={titleSettings}
+        onUpdatePosition={onUpdatePosition}
+        onUpdateFont={onUpdateFont}
+        onUpdateSize={onUpdateSize}
+        onToggleBold={onToggleBold}
+        onToggleItalic={onToggleItalic}
+        onToggleStroke={onToggleStroke}
+        onToggleShadow={onToggleShadow}
+        onApplyPreset={onApplyPreset}
+        activePreset={activePreset}
+        titlePresets={titlePresets}
+        POSITION_OPTIONS={POSITION_OPTIONS}
+        FONT_OPTIONS={FONT_OPTIONS}
+      />
     </div>
   )
 }

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

@@ -5,7 +5,7 @@
 import { useState, useCallback } from "react"
 import { message } from "antd"
 import type { GeneratedVideo } from "@/api/template-editor"
-import { confirmGeneration } from "@/api/generation"
+import { confirmGeneration, createPreview } from "@/api/generation"
 import type { UseGenerateVideoProps } from "./generate-video/types"
 import { getGenerationPhase } from "./generate-video/phase"
 import { useGenerationPolling } from "./generate-video/useGenerationPolling"
@@ -55,21 +55,17 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
     clearTimer()
 
     try {
-      // 使用确认生成 API（基于预览任务）
       // 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
@@ -83,7 +79,6 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
           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
@@ -92,7 +87,35 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
         outputHeight = 1920
       }
 
-      await confirmGeneration(props.previewTaskId, {
+      // 获取或创建后端任务 ID
+      // 预览改为前端播放后，不再有预览任务，需要在此处创建
+      let taskId = props.previewTaskId
+      if (!taskId) {
+        const assetIds =
+          props.materialMode === "auto" ? props.smartSelectedIds : props.selectedMaterials
+        const previewResp = await createPreview({
+          template_id: selectedTemplate,
+          asset_ids: assetIds,
+          duration: props.duration || undefined,
+          video_ratio: props.videoRatio,
+          voice_ids: undefined,
+          title_config: props.titleSettings?.title
+            ? {
+                text: props.titleSettings.title,
+                font: props.titleSettings.font,
+                font_size: props.titleSettings.size,
+                font_color: props.titleSettings.color,
+                position: props.titleSettings.position,
+                bold: props.titleSettings.bold,
+                stroke: props.titleSettings.stroke,
+                shadow: props.titleSettings.shadow,
+              }
+            : undefined,
+        })
+        taskId = previewResp.task_id
+      }
+
+      await confirmGeneration(taskId, {
         output_width: outputWidth,
         output_height: outputHeight,
         cover_url: props.coverSettings.upload_url || "",
@@ -109,7 +132,7 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
       setGenerateError(finalMsg)
       message.error(finalMsg)
     }
-  }, [props, clearTimer, startPolling])
+  }, [props, clearTimer, startPolling, selectedTemplate])
 
   /* 重新生成（失败后重试） */
   const retry = useCallback(() => {

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

@@ -0,0 +1,125 @@
+/**
+ * 预览素材加载 Hook
+ * 根据选中的素材 ID 列表，批量获取素材详情（含 file_url、duration 等）
+ * 供前端预览播放器使用
+ */
+import { useState, useEffect, useCallback, useRef } from "react"
+import type { AssetItem } from "@/api/assets"
+import type { AxiosResponse } from "axios"
+
+/** 批量获取素材详情的 API 路径 */
+const ASSETS_BATCH_URL = "/assets/batch"
+
+/**
+ * 通过 ID 列表批量获取素材
+ * 优先使用批量接口，失败则回退为逐个获取
+ */
+async function fetchAssetsByIds(ids: string[]): Promise<AssetItem[]> {
+  if (!ids.length) return []
+
+  try {
+    // 尝试批量接口
+    const { default: apiClient } = await import("@/api/client")
+    const response = await apiClient.post(ASSETS_BATCH_URL, { ids })
+    const items: AssetItem[] = response.data?.items || response.data || []
+    if (items.length > 0) return items
+  } catch {
+    // 批量接口不存在，回退为逐个获取
+  }
+
+  // 回退：逐个获取
+  try {
+    const { default: apiClient } = await import("@/api/client")
+    const results = await Promise.allSettled(
+      ids.map((id) => apiClient.get<AssetItem>(`/assets/${id}`)),
+    )
+    return results
+      .filter(
+        (r): r is PromiseFulfilledResult<AxiosResponse<AssetItem>> =>
+          r.status === "fulfilled" && !!r.value?.data,
+      )
+      .map((r) => r.value.data)
+  } catch {
+    return []
+  }
+}
+
+interface UsePreviewAssetsReturn {
+  /** 加载后的素材列表 */
+  assets: AssetItem[]
+  /** 是否正在加载 */
+  loading: boolean
+  /** 是否已就绪（加载完成） */
+  ready: boolean
+  /** 手动触发重新加载 */
+  reload: () => void
+}
+
+/**
+ * usePreviewAssets — 加载选中素材的视频文件信息
+ */
+export function usePreviewAssets(assetIds: string[], enabled: boolean): UsePreviewAssetsReturn {
+  const [assets, setAssets] = useState<AssetItem[]>([])
+  const [loading, setLoading] = useState(false)
+  const [ready, setReady] = useState(false)
+  const requestIdRef = useRef(0)
+
+  // 稳定化 assetIds：只有内容真正变化时才更新引用
+  const stableAssetIds = useStableArray(assetIds)
+
+  const load = useCallback(async () => {
+    if (!stableAssetIds.length || !enabled) {
+      setAssets([])
+      setReady(false)
+      return
+    }
+
+    const thisRequestId = ++requestIdRef.current
+    setLoading(true)
+    setReady(false)
+
+    try {
+      const result = await fetchAssetsByIds(stableAssetIds)
+      // 防止竞态：只保留最新请求的结果
+      if (requestIdRef.current === thisRequestId) {
+        setAssets(result)
+        setReady(result.length > 0)
+      }
+    } catch {
+      if (requestIdRef.current === thisRequestId) {
+        setAssets([])
+        setReady(false)
+      }
+    } finally {
+      if (requestIdRef.current === thisRequestId) {
+        setLoading(false)
+      }
+    }
+  }, [stableAssetIds, enabled])
+
+  useEffect(() => {
+    load()
+  }, [load])
+
+  return { assets, loading, ready, reload: load }
+}
+
+/**
+ * useStableArray — 数组内容稳定化 Hook
+ * 只有数组内容真正变化时才返回新的引用，避免父组件 re-render 导致的无效更新
+ */
+function useStableArray<T>(array: T[]): T[] {
+  const ref = useRef<T[]>(array)
+
+  // 比较数组内容是否真正变化
+  const hasChanged =
+    array.length !== ref.current.length || array.some((item, index) => item !== ref.current[index])
+
+  if (hasChanged) {
+    ref.current = array
+  }
+
+  return ref.current
+}
+
+export default usePreviewAssets

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

@@ -0,0 +1,311 @@
+/**
+ * 素材片段调度器 Hook
+ * 控制原生 <video> 元素按时间线依次播放素材片段（入点→出点）
+ * 实现前端预览播放，替代后端 FFmpeg 渲染
+ */
+import React, { useState, useRef, useCallback, useEffect, useMemo } from "react"
+
+/** 单个播放片段 */
+export interface PlaybackSegment {
+  /** 素材 ID */
+  assetId: string
+  /** 素材视频 URL */
+  videoUrl: string
+  /** 片段在素材中的入点（秒） */
+  startTime: number
+  /** 片段在素材中的出点（秒） */
+  endTime: number
+  /** 片段在时间线中的顺序 */
+  order: number
+}
+
+/** 调度器返回 */
+export interface SegmentSchedulerState {
+  /** 是否正在播放 */
+  isPlaying: boolean
+  /** 当前播放的全局时间（秒） */
+  currentTime: number
+  /** 总时长（秒） */
+  totalDuration: number
+  /** 当前片段索引（在 segments 数组中的位置） */
+  currentSegmentIndex: number
+  /** 当前片段的本地播放时间 */
+  segmentLocalTime: number
+  /** 是否已播完 */
+  isEnded: boolean
+  /** 是否可以播放（至少有 1 个片段） */
+  canPlay: boolean
+  /** 播放 */
+  play: () => void
+  /** 暂停 */
+  pause: () => void
+  /** 切换播放/暂停 */
+  togglePlayPause: () => void
+  /** 跳转到全局时间 */
+  seekTo: (time: number) => void
+  /** 绑定到 <video> 元素 */
+  videoRef: React.RefObject<HTMLVideoElement>
+}
+
+/**
+ * 根据全局时间定位对应的片段和本地时间
+ */
+function findSegmentAtTime(
+  segments: PlaybackSegment[],
+  globalTime: number,
+): { index: number; localTime: number } {
+  let accumulated = 0
+  for (let i = 0; i < segments.length; i++) {
+    const seg = segments[i]
+    const segDuration = seg.endTime - seg.startTime
+    if (globalTime < accumulated + segDuration || i === segments.length - 1) {
+      return { index: i, localTime: seg.startTime + (globalTime - accumulated) }
+    }
+    accumulated += segDuration
+  }
+  return { index: segments.length - 1, localTime: segments[segments.length - 1].endTime }
+}
+
+/**
+ * 计算每个片段的全局起始时间
+ */
+function buildTimeline(segments: PlaybackSegment[]): number[] {
+  const starts: number[] = []
+  let acc = 0
+  for (const seg of segments) {
+    starts.push(acc)
+    acc += seg.endTime - seg.startTime
+  }
+  return starts
+}
+
+/**
+ * useSegmentScheduler — 素材片段调度器
+ */
+export function useSegmentScheduler(segments: PlaybackSegment[]): SegmentSchedulerState {
+  const videoRef = useRef<HTMLVideoElement | null>(null)
+  const [isPlaying, setIsPlaying] = useState(false)
+  const [currentTime, setCurrentTime] = useState(0)
+  const [currentSegmentIndex, setCurrentSegmentIndex] = useState(0)
+  const [isEnded, setIsEnded] = useState(false)
+  const rafRef = useRef<number>(0)
+  const isSeekingRef = useRef(false)
+
+  // 预加载用的隐藏 video 元素
+  const preloadVideoRef = useRef<HTMLVideoElement | null>(null)
+
+  // 计算时间线
+  const timelineStarts = useMemo(() => buildTimeline(segments), [segments])
+  const totalDuration = useMemo(
+    () => segments.reduce((sum, seg) => sum + (seg.endTime - seg.startTime), 0),
+    [segments],
+  )
+
+  const canPlay = segments.length > 0
+
+  // 当前片段信息
+  const currentSegment = segments[currentSegmentIndex] || null
+  const segmentLocalTime = currentSegment
+    ? currentTime - (timelineStarts[currentSegmentIndex] || 0) + currentSegment.startTime
+    : 0
+
+  /** 切换到指定片段 */
+  const switchToSegment = useCallback(
+    (index: number, seekToLocalTime?: number) => {
+      const video = videoRef.current
+      if (!video || index >= segments.length) return
+
+      const seg = segments[index]
+      video.src = seg.videoUrl
+
+      const localTime = seekToLocalTime ?? seg.startTime
+      // 等待 src 设置后再设置 currentTime
+      const onLoaded = () => {
+        video.currentTime = localTime
+        video.removeEventListener("loadedmetadata", onLoaded)
+      }
+      video.addEventListener("loadedmetadata", onLoaded)
+
+      setCurrentSegmentIndex(index)
+
+      // 预加载下一段
+      if (index + 1 < segments.length) {
+        const nextSeg = segments[index + 1]
+        if (!preloadVideoRef.current) {
+          preloadVideoRef.current = document.createElement("video")
+          preloadVideoRef.current.preload = "auto"
+        }
+        preloadVideoRef.current.src = nextSeg.videoUrl
+      }
+    },
+    [segments],
+  )
+
+  /** 播放循环 — 检测片段边界并切换 */
+  const tick = useCallback(() => {
+    const video = videoRef.current
+    if (!video || isSeekingRef.current) {
+      rafRef.current = requestAnimationFrame(tick)
+      return
+    }
+
+    const seg = segments[currentSegmentIndex]
+    if (!seg) return
+
+    // 检查是否到达出点（容差 0.15s）
+    if (video.currentTime >= seg.endTime - 0.15) {
+      const nextIndex = currentSegmentIndex + 1
+      if (nextIndex < segments.length) {
+        // 切到下一段
+        switchToSegment(nextIndex)
+        const accumulatedTime =
+          (timelineStarts[currentSegmentIndex] || 0) + (seg.endTime - seg.startTime)
+        setCurrentTime(accumulatedTime)
+      } else {
+        // 播放结束
+        video.pause()
+        setIsPlaying(false)
+        setIsEnded(true)
+        setCurrentTime(totalDuration)
+        return
+      }
+    } else {
+      // 更新全局时间
+      const globalTime =
+        (timelineStarts[currentSegmentIndex] || 0) + (video.currentTime - seg.startTime)
+      setCurrentTime(Math.max(0, Math.min(globalTime, totalDuration)))
+    }
+
+    rafRef.current = requestAnimationFrame(tick)
+  }, [segments, currentSegmentIndex, timelineStarts, totalDuration, switchToSegment])
+
+  /** 播放 */
+  const play = useCallback(async () => {
+    const video = videoRef.current
+    if (!video || !canPlay) return
+
+    setIsEnded(false)
+
+    // 如果还没设置 src（首次播放），先加载第一段
+    if (!video.src || video.src === "") {
+      switchToSegment(0)
+    }
+
+    try {
+      await video.play()
+      setIsPlaying(true)
+      rafRef.current = requestAnimationFrame(tick)
+    } catch {
+      // 自动播放可能被浏览器阻止，忽略
+      console.warn("[useSegmentScheduler] auto-play blocked by browser")
+    }
+  }, [canPlay, switchToSegment, tick])
+
+  /** 暂停 */
+  const pause = useCallback(() => {
+    const video = videoRef.current
+    if (video) video.pause()
+    setIsPlaying(false)
+    cancelAnimationFrame(rafRef.current)
+  }, [])
+
+  /** 切换播放/暂停 */
+  const togglePlayPause = useCallback(() => {
+    if (isPlaying) {
+      pause()
+    } else {
+      if (isEnded) {
+        // 播放结束后再次播放，从头开始
+        setIsEnded(false)
+        switchToSegment(0, segments[0]?.startTime)
+        const video = videoRef.current
+        if (video) {
+          const onSeeked = () => {
+            video.play().catch(() => {})
+            setIsPlaying(true)
+            setCurrentTime(0)
+            rafRef.current = requestAnimationFrame(tick)
+            video.removeEventListener("seeked", onSeeked)
+          }
+          video.addEventListener("seeked", onSeeked)
+        }
+      } else {
+        play()
+      }
+    }
+  }, [isPlaying, isEnded, pause, play, switchToSegment, segments, tick])
+
+  /** 跳转到指定全局时间 */
+  const seekTo = useCallback(
+    (time: number) => {
+      const video = videoRef.current
+      if (!video || !canPlay) return
+
+      const clampedTime = Math.max(0, Math.min(time, totalDuration))
+      const { index, localTime } = findSegmentAtTime(segments, clampedTime)
+
+      isSeekingRef.current = true
+
+      // 如果片段变了，需要切换 src
+      if (index !== currentSegmentIndex) {
+        switchToSegment(index, localTime)
+        // switchToSegment 会设置 src 并在 loadedmetadata 后设置 currentTime
+        // 所以这里不需要再设置
+      } else {
+        video.currentTime = localTime
+      }
+
+      setCurrentTime(clampedTime)
+      setCurrentSegmentIndex(index)
+      setIsEnded(false)
+
+      // 延迟恢复 tick 检测
+      setTimeout(() => {
+        isSeekingRef.current = false
+      }, 200)
+    },
+    [canPlay, totalDuration, segments, currentSegmentIndex, switchToSegment],
+  )
+
+  // 组件卸载时清理
+  useEffect(() => {
+    return () => {
+      cancelAnimationFrame(rafRef.current)
+      if (preloadVideoRef.current) {
+        preloadVideoRef.current.src = ""
+        preloadVideoRef.current = null
+      }
+    }
+  }, [])
+
+  // 片段列表变化时重置
+  useEffect(() => {
+    cancelAnimationFrame(rafRef.current)
+    setIsPlaying(false)
+    setCurrentTime(0)
+    setCurrentSegmentIndex(0)
+    setIsEnded(false)
+    const video = videoRef.current
+    if (video) {
+      video.pause()
+      video.src = ""
+    }
+  }, [segments])
+
+  return {
+    isPlaying,
+    currentTime,
+    totalDuration,
+    currentSegmentIndex,
+    segmentLocalTime,
+    isEnded,
+    canPlay,
+    play,
+    pause,
+    togglePlayPause,
+    seekTo,
+    videoRef,
+  }
+}
+
+export default useSegmentScheduler

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

@@ -1,476 +0,0 @@
-/**
- * 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 => {
-  if (val == null) return fallback
-  const s = safeExtractError(val)
-  return s || fallback
-}
-
-/** 安全地将值转为数字，防止非数字值进入渲染 */
-const safeNumber = (val: unknown, fallback = 0): number => {
-  if (typeof val === "number" && !Number.isNaN(val)) return val
-  if (typeof val === "string") {
-    const n = Number(val)
-    return Number.isNaN(n) ? fallback : n
-  }
-  return fallback
-}
-
-interface UseStep5PreviewProps {
-  templates: EditingTemplate[]
-  selectedTemplate: string
-  materialMode: "manual" | "auto"
-  selectedMaterials: string[]
-  smartSelectedIds: string[]
-  duration: number
-  videoRatio: string
-  /** 配音 voice_ids（传给后端，让预览包含配音音频） */
-  voiceIds?: string[]
-  /** 配音素材库ID（用户选择的上传音频或AI配音素材） */
-  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"
-
-/** 单个预览生成结果 */
-export interface PreviewResult {
-  taskId: string
-  videoUrl: string
-  clipCount: number
-  transitionCount: number
-  materialUsage: number
-  duration: number
-  fileSize: number
-  generateDuration: number
-  progress: number
-}
-
-/** 单个预览项的完整状态（用于多预览） */
-export interface PreviewItem {
-  index: number
-  status: PreviewStatus
-  result: PreviewResult | null
-  error: string
-  progress: number
-}
-
-// 轮询超时时间（10 分钟）
-const POLL_TIMEOUT_MS = 10 * 60 * 1000
-
-/** 初始单项状态 */
-const createInitialItem = (index: number): PreviewItem => ({
-  index,
-  status: "idle",
-  result: null,
-  error: "",
-  progress: 0,
-})
-
-export function useStep5Preview({
-  templates,
-  selectedTemplate,
-  materialMode,
-  selectedMaterials,
-  smartSelectedIds,
-  duration,
-  videoRatio,
-  voiceIds,
-  voiceLibraryId,
-  previewCount = 1,
-  titleSettings,
-}: UseStep5PreviewProps) {
-  const templateName = useMemo(
-    () => templates.find((t) => t.id === selectedTemplate)?.name ?? "未选择",
-    [templates, selectedTemplate],
-  )
-
-  const materialCount = useMemo(() => {
-    if (materialMode === "auto") {
-      return `${smartSelectedIds.length} 个素材（智能匹配）`
-    }
-    return `${selectedMaterials.length} 个素材`
-  }, [materialMode, selectedMaterials.length, smartSelectedIds.length])
-
-  const materialTotal = materialMode === "auto" ? smartSelectedIds.length : selectedMaterials.length
-
-  /* ── 多预览状态 ── */
-  const [items, setItems] = useState<PreviewItem[]>(() =>
-    Array.from({ length: previewCount }, (_, i) => createInitialItem(i)),
-  )
-  const [selectedIndex, setSelectedIndex] = useState(0)
-
-  // 每个任务 ID + 轮询定时器，用于防止竞态条件（按 index 存储）
-  const taskIdsRef = useRef<Map<number, string>>(new Map())
-  const pollTimersRef = useRef<Map<number, ReturnType<typeof setTimeout>>>(new Map())
-  const startTimeRef = useRef<number>(0)
-
-  const clearPollTimer = useCallback((index?: number) => {
-    if (index !== undefined) {
-      const timer = pollTimersRef.current.get(index)
-      if (timer) {
-        clearTimeout(timer)
-        pollTimersRef.current.delete(index)
-      }
-    } else {
-      pollTimersRef.current.forEach((timer) => clearTimeout(timer))
-      pollTimersRef.current.clear()
-    }
-  }, [])
-
-  // 同步 previewCount 变化（增减项）
-  useEffect(() => {
-    setItems((prev) => {
-      if (prev.length === previewCount) return prev
-      if (prev.length > previewCount) return prev.slice(0, previewCount)
-      return [
-        ...prev,
-        ...Array.from({ length: previewCount - prev.length }, (_, i) =>
-          createInitialItem(prev.length + i),
-        ),
-      ]
-    })
-    // 如果 selectedIndex 超出范围，重置
-    setSelectedIndex((prev) => Math.min(prev, previewCount - 1))
-  }, [previewCount])
-
-  /* ── 参数变化时重置所有预览状态 ── */
-  const prevDepsRef = useRef({
-    selectedTemplate,
-    materialMode,
-    selectedMaterials: [...selectedMaterials].sort().join(","),
-    smartSelectedIds: [...smartSelectedIds].sort().join(","),
-    duration,
-    videoRatio,
-    voiceIds: [...(voiceIds || [])].sort().join(","),
-    titleSettings: titleSettings?.title || "",
-  })
-
-  useEffect(() => {
-    const currentKey = [
-      selectedTemplate,
-      materialMode,
-      [...selectedMaterials].sort().join(","),
-      [...smartSelectedIds].sort().join(","),
-      duration,
-      videoRatio,
-      [...(voiceIds || [])].sort().join(","),
-      titleSettings?.title || "",
-    ].join("|")
-
-    const prevKey = [
-      prevDepsRef.current.selectedTemplate,
-      prevDepsRef.current.materialMode,
-      prevDepsRef.current.selectedMaterials,
-      prevDepsRef.current.smartSelectedIds,
-      prevDepsRef.current.duration,
-      prevDepsRef.current.videoRatio,
-      prevDepsRef.current.voiceIds,
-      prevDepsRef.current.titleSettings,
-    ].join("|")
-
-    if (prevKey !== currentKey && items.some((it) => it.status !== "idle")) {
-      taskIdsRef.current.clear()
-      clearPollTimer()
-      setItems(Array.from({ length: previewCount }, (_, i) => createInitialItem(i)))
-      setSelectedIndex(0)
-    }
-
-    prevDepsRef.current = {
-      selectedTemplate,
-      materialMode,
-      selectedMaterials: [...selectedMaterials].sort().join(","),
-      smartSelectedIds: [...smartSelectedIds].sort().join(","),
-      duration,
-      videoRatio,
-      voiceIds: [...(voiceIds || [])].sort().join(","),
-      titleSettings: titleSettings?.title || "",
-    }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [
-    selectedTemplate,
-    materialMode,
-    selectedMaterials,
-    smartSelectedIds,
-    duration,
-    videoRatio,
-    voiceIds,
-    previewCount,
-    titleSettings,
-  ])
-
-  // 组件卸载时清理所有轮询
-  useEffect(() => {
-    return () => {
-      clearPollTimer()
-    }
-  }, [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)
-
-          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: 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))
-    },
-    [selectedTemplate],
-  )
-
-  /** 生成所有预览 */
-  const generatePreview = useCallback(async () => {
-    if (!selectedTemplate) {
-      setItems((prev) => prev.map((it) => ({ ...it, status: "error", error: "请先选择模板" })))
-      return
-    }
-    if (materialTotal === 0) {
-      setItems((prev) => prev.map((it) => ({ ...it, status: "error", error: "请先选择素材" })))
-      return
-    }
-
-    // 取消之前的所有轮询
-    clearPollTimer()
-    taskIdsRef.current.clear()
-
-    // 初始化所有项为 pending
-    setItems(
-      Array.from({ length: previewCount }, (_, i) => ({
-        index: i,
-        status: "pending" as PreviewStatus,
-        result: null,
-        error: "",
-        progress: 0,
-      })),
-    )
-    setSelectedIndex(0)
-    startTimeRef.current = Date.now()
-
-    const assetIds = materialMode === "auto" ? smartSelectedIds : selectedMaterials
-
-    // 并发创建所有预览任务（Promise.all 并行请求，减少串行等待）
-    const createTasks = Array.from({ length: previewCount }, async (_, i) => {
-      try {
-        const response = await createPreview({
-          template_id: selectedTemplate,
-          asset_ids: assetIds,
-          duration: duration || undefined,
-          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
-
-        taskIdsRef.current.set(i, response.task_id)
-        pollPreviewStatus(i, response.task_id)
-      } catch (e) {
-        const errMsg = safeString(e instanceof Error ? e.message : e, "预览生成失败")
-        setItems((prev) =>
-          prev.map((it) => (it.index === i ? { ...it, status: "error", error: errMsg } : it)),
-        )
-      }
-    })
-    await Promise.all(createTasks)
-  }, [
-    selectedTemplate,
-    materialTotal,
-    materialMode,
-    smartSelectedIds,
-    selectedMaterials,
-    duration,
-    videoRatio,
-    voiceIds,
-    voiceLibraryId,
-    previewCount,
-    titleSettings,
-    clearPollTimer,
-    pollPreviewStatus,
-  ])
-
-  /** 重新生成所有预览 */
-  const regeneratePreview = useCallback(() => {
-    generatePreview()
-  }, [generatePreview])
-
-  /** 是否所有预览都已完成 */
-  const allReady = items.length > 0 && items.every((it) => it.status === "ready")
-  /** 是否至少有一个预览已完成 */
-  const anyReady = items.some((it) => it.status === "ready")
-  /** 是否有任一正在生成中 */
-  const anyGenerating = items.some((it) => it.status === "pending" || it.status === "generating")
-
-  /** 当前选中的预览结果 */
-  const selectedResult = items[selectedIndex]?.result ?? null
-
-  /** 综合状态（兼容旧逻辑） */
-  const previewStatus: PreviewStatus = useMemo(() => {
-    if (items.every((it) => it.status === "idle")) return "idle"
-    if (items.some((it) => it.status === "pending" || it.status === "generating"))
-      return "generating"
-    if (allReady) return "ready"
-    if (items.every((it) => it.status === "error")) return "error"
-    // 部分完成部分出错
-    if (anyReady) return "ready"
-    return "error"
-  }, [items, allReady, anyReady])
-
-  /** 综合进度（取平均） */
-  const progress = useMemo(() => {
-    if (items.length === 0) return 0
-    return Math.round(items.reduce((sum, it) => sum + it.progress, 0) / items.length)
-  }, [items])
-
-  /** 综合错误信息 */
-  const previewError = useMemo(() => {
-    const errorItems = items.filter((it) => it.status === "error" && it.error)
-    if (errorItems.length === 0) return ""
-    if (errorItems.length === 1) return errorItems[0].error
-    return `${errorItems.length} 个预览生成失败`
-  }, [items])
-
-  const canProceed = anyReady
-
-  /** 当前选中预览的 taskId（用于确认生成时复用预览产物） */
-  const selectedTaskId = selectedResult?.taskId ?? ""
-
-  return {
-    templateName,
-    materialCount,
-    duration,
-    videoRatio,
-    // 多预览状态
-    items,
-    selectedIndex,
-    setSelectedIndex,
-    previewCount,
-    // 综合状态
-    previewStatus,
-    previewResult: selectedResult,
-    previewError,
-    progress,
-    canProceed,
-    allReady,
-    anyReady,
-    anyGenerating,
-    generatePreview,
-    regeneratePreview,
-    // 确认生成复用预览产物
-    selectedTaskId,
-  }
-}
-
-export default useStep5Preview

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

@@ -109,26 +109,30 @@ export function useStep6Cover({
       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
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const anyErr = err as any
+      // 如果 API 拦截器已经弹出了后端返回的具体错误信息，这里跳过重复 toast
+      if (anyErr?.__msgShown) {
+        // 拦截器已处理，不再重复弹出
+      } else {
+        let errorMsg = "封面生成失败"
+        const e = anyErr as {
+          response?: { data?: { detail?: string; message?: string }; status?: number }
+          request?: unknown
+          message?: string
+        }
+        if (e.response) {
+          const detail = e.response.data?.detail || e.response.data?.message || ""
+          errorMsg = detail || `后端错误 (${e.response.status})`
+          console.error("[Step6] 后端返回:", e.response.data)
+        } else if (e.request) {
+          errorMsg = "服务器无响应，请检查网络连接"
+          console.error("[Step6] 请求无响应:", e.request)
+        } else if (e.message) {
+          errorMsg = e.message
+        }
+        message.error(errorMsg)
       }
-      if (e.response) {
-        // 后端返回错误
-        const detail = e.response.data?.detail || e.response.data?.message || ""
-        errorMsg = detail || `后端错误 (${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 {
       clearTimeout(timeoutId)
       setGenerating(false)

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

@@ -2,6 +2,8 @@
  * 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) → 标题(4) → 预览(5) → 封面(6) → 确认(7)
+ *
+ * V24: previewReady 改为前端素材加载状态
  */
 import { message } from "antd"
 import type { TitleSettings } from "../types"
@@ -14,7 +16,7 @@ export interface UseStepNavigationOptions {
   selectedMaterials: string[]
   smartSelectedIds: string[]
   titleSettings: TitleSettings
-  /** Step4 是否已生成预览 */
+  /** 预览是否就绪（前端素材已加载） */
   previewReady: boolean
 }
 
@@ -54,7 +56,7 @@ export const useStepNavigation = (options: UseStepNavigationOptions): UseStepNav
       return
     }
     if (currentStep === 5 && !previewReady) {
-      message.warning("请先生成剪辑预览")
+      message.warning("请先选择素材以预览效果")
       return
     }
     if (currentStep < 7) {

apps/web/src/test/hooks/useAuth.test.tsx

@@ -31,14 +31,27 @@ vi.mock("react-router-dom", async () => {
 })
 
 vi.mock("@/store/authStore", () => ({
-  useAuthStore: (selector: any) =>
-    selector({
-      user: { id: "1", username: "testuser" },
-      token: "mock-token",
-      isAuthenticated: true,
-      setAuth: mockSetAuth,
-      clearAuth: mockClearAuth,
-    }),
+  useAuthStore: Object.assign(
+    (selector: any) =>
+      selector({
+        user: { id: "1", username: "testuser" },
+        token: "mock-token",
+        refreshToken: "mock-refresh-token",
+        isAuthenticated: true,
+        setAuth: mockSetAuth,
+        clearAuth: mockClearAuth,
+      }),
+    {
+      getState: () => ({
+        user: { id: "1", username: "testuser" },
+        token: "mock-token",
+        refreshToken: "mock-refresh-token",
+        isAuthenticated: true,
+        setAuth: mockSetAuth,
+        clearAuth: mockClearAuth,
+      }),
+    },
+  ),
 }))
 
 vi.mock("@tanstack/react-query", () => ({

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

@@ -47,7 +47,8 @@ describe("GeneratePage module smoke test", () => {
   })
 })
 import "@/pages/generate/hooks/useGenerateVideo"
-import "@/pages/generate/hooks/useStep5Preview"
+import "@/pages/generate/hooks/usePreviewAssets"
+import "@/pages/generate/hooks/useSegmentScheduler"
 import "@/pages/generate/hooks/generate-video/useGenerationPolling"
 import "@/pages/generate/hooks/useGenerateFormState"
 import "@/pages/generate/hooks/useGenerateFormState/useTemplateSelection"

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

@@ -5,7 +5,9 @@
 import { describe, it, expect } from "vitest"
 
 import "@/pages/generate/components/Step5GeneratePreview"
-import "@/pages/generate/hooks/useStep5Preview"
+import "@/pages/generate/hooks/usePreviewAssets"
+import "@/pages/generate/hooks/useSegmentScheduler"
+import "@/pages/generate/components/FrontendPreviewPlayer"
 import "@/pages/generate/hooks/useStepNavigation"
 import "@/pages/generate/components/GenerateStepContent"
 import "@/pages/generate/GeneratePage"

apps/worker/worker_app/tasks/edit_plan_generation.py

@@ -98,6 +98,7 @@ def _finalize_render_success(
     output_path: Path,
     engine: str,
     thumbnail_url: str = "",
+    cover_candidates: list[dict] | None = None,
 ) -> dict:
     """渲染成功后的统一收尾：查重 + 更新状态 + 返回结果。"""
     # 创建 GeneratedVideo 记录 + 查重
@@ -163,6 +164,19 @@ def _finalize_render_success(
                 clip_count=len(rendered_clip_ids),
             )
             gen_task.completed_at = datetime.now(timezone.utc)
+
+            # 回写封面 URL 到 GenerationTask，供封面生成接口读取
+            if cover_candidates:
+                first_cover = cover_candidates[0].get("image_url") or cover_candidates[0].get("url") or ""
+                if first_cover:
+                    gen_task.cover_url = first_cover
+                    logger.info(
+                        "预览渲染完成，回写 cover_url: plan_id=%s task_id=%s url=%s",
+                        plan_id,
+                        generation_task_id,
+                        first_cover[:80],
+                    )
+
             gen_task_repo.update(gen_task)
 
     logger.info(
@@ -288,6 +302,7 @@ def _render_with_unified(
         output_path=output_path,
         engine="unified",
         thumbnail_url=thumbnail_url,
+        cover_candidates=result.cover_candidates,
     )
 
 

apps/worker/worker_app/tasks/generation.py

@@ -15,7 +15,6 @@ from __future__ import annotations
 
 import json
 import logging
-import os
 import tempfile
 import time
 from pathlib import Path
@@ -37,8 +36,6 @@ from packages.domain.bgm_utils import merge_bgm_config
 OUTPUT_WIDTH = 1280
 OUTPUT_HEIGHT = 720
 OUTPUT_FPS = 25.0
-OUTPUT_DURATION_SECONDS = 5.0
-GENERATED_FILES_DIR = Path(os.getenv("GENERATED_FILES_DIR", "/app/generated"))
 
 logger = logging.getLogger(__name__)
 
@@ -155,7 +152,6 @@ def _flush_logs(task_id: str, gen_task) -> None:
 # ── 共享工具模块导入 ──────────────────────────────────────────────────────────
 
 from video_processing.dedup_helpers import create_video_record_and_dedup
-from video_processing.ffmpeg_utils import FFMPEG_BIN, run_ffmpeg
 from video_processing.oss_helpers import (
     download_asset,
     get_signed_download_url,
@@ -330,61 +326,6 @@ def _build_plan_and_clips_from_task(
     return plan, clips, asset_path_map
 
 
-def _create_fallback_clip(output_path: Path, title: str) -> None:
-    """创建 fallback 视频（无素材时）"""
-    safe_title = title.replace(":", "\\:").replace("'", "\\'")[:80]
-    run_ffmpeg(
-        [
-            FFMPEG_BIN,
-            "-y",
-            "-f",
-            "lavfi",
-            "-i",
-            f"color=c=#111827:s={OUTPUT_WIDTH}x{OUTPUT_HEIGHT}:d={OUTPUT_DURATION_SECONDS}:r={int(OUTPUT_FPS)}",
-            "-vf",
-            f"drawtext=text='{safe_title}':fontcolor=white:fontsize=48:x=(w-text_w)/2:y=(h-text_h)/2",
-            "-c:v",
-            "libx264",
-            "-pix_fmt",
-            "yuv420p",
-            "-movflags",
-            "+faststart",
-            str(output_path),
-        ]
-    )
-
-
-def _mux_audio_track(video_path: Path, audio_path: str, output_path: Path) -> None:
-    """将音频轨混入已渲染的视频（后处理步骤）。
-
-    使用 FFmpeg 将视频和音频合并，视频时长为准，音频不足则循环，
-    音频过长则截断。
-    """
-    command = [
-        FFMPEG_BIN,
-        "-y",
-        "-i",
-        str(video_path),
-        "-i",
-        audio_path,
-        "-c:v",
-        "copy",
-        "-c:a",
-        "aac",
-        "-b:a",
-        "192k",
-        "-shortest",
-        "-map",
-        "0:v:0",
-        "-map",
-        "1:a:0",
-        "-movflags",
-        "+faststart",
-        str(output_path),
-    ]
-    run_ffmpeg(command)
-
-
 def _download_voice_asset(voice_library_id: str, local_path: Path) -> bool:
     """下载配音文件。
 
@@ -428,105 +369,6 @@ def _download_voice_asset(voice_library_id: str, local_path: Path) -> bool:
     return download_asset(storage_key, local_path)
 
 
-def _prepare_bgm_track(
-    *,
-    bgm_config: dict,
-    temp_path: Path,
-    task_id: str = "",
-) -> str | None:
-    """准备 BGM 音频文件（下载到本地）.
-
-    支持 3 种来源（按优先级）：
-    1. audio_url — 外部直链 URL（最高优先级）
-    2. asset_id — 素材库中的音频素材
-    3. preset_id — 预设 BGM 库
-
-    Returns:
-        BGM 本地文件路径，准备失败返回 None
-    """
-    from urllib.parse import urlparse
-
-    audio_url = bgm_config.get("audio_url", "") or ""
-    asset_id = bgm_config.get("asset_id", "") or ""
-    preset_id = bgm_config.get("preset_id", "") or ""
-
-    bgm_file = temp_path / f"bgm_{task_id or 'track'}.mp3"
-
-    # 优先级1：外部直链 URL
-    if audio_url:
-        try:
-            parsed = urlparse(audio_url)
-            if parsed.scheme in ("http", "https"):
-                from video_processing.url_security import (
-                    ALLOWED_AUDIO_MIME_TYPES,
-                    safe_download_file,
-                )
-
-                logger.info("[task_id=%s] [BGM] 从URL下载: %s", task_id, audio_url[:80])
-                safe_download_file(
-                    audio_url,
-                    str(bgm_file),
-                    purpose="bgm_download",
-                    allowed_mime_types=ALLOWED_AUDIO_MIME_TYPES,
-                    timeout=60.0,
-                )
-                if bgm_file.exists() and bgm_file.stat().st_size > 0:
-                    return str(bgm_file)
-        except Exception as e:
-            logger.warning("[task_id=%s] [BGM] URL下载失败: %s", task_id, e)
-
-    # 优先级2：素材库素材
-    if asset_id:
-        try:
-            from app.core.db import SessionLocal
-
-            from packages.adapters.sqlalchemy_impl.models import AssetModel
-
-            session = SessionLocal()
-            try:
-                model = session.query(AssetModel).filter(AssetModel.id == asset_id).first()
-                if model and (model.storage_key or model.file_url):
-                    # 兼容存量数据：storage_key 为空时 fallback 到 file_url
-                    storage_key = model.storage_key or model.file_url
-                    logger.info("[task_id=%s] [BGM] 从素材库下载: asset_id=%s", task_id, asset_id)
-                    ok = download_asset(storage_key, bgm_file)
-                    if ok and bgm_file.exists() and bgm_file.stat().st_size > 0:
-                        return str(bgm_file)
-            finally:
-                session.close()
-        except Exception as e:
-            logger.warning("[task_id=%s] [BGM] 素材库下载失败: %s", task_id, e)
-
-    # 优先级3：预设 BGM 库
-    if preset_id:
-        try:
-            from packages.domain.preset_bgm import get_preset_bgm
-
-            preset = get_preset_bgm(preset_id)
-            if preset and preset.audio_url:
-                from video_processing.url_security import (
-                    ALLOWED_AUDIO_MIME_TYPES,
-                    safe_download_file,
-                )
-
-                logger.info("[task_id=%s] [BGM] 从预设库下载: preset_id=%s", task_id, preset_id)
-                safe_download_file(
-                    preset.audio_url,
-                    str(bgm_file),
-                    purpose="bgm_preset_download",
-                    allowed_mime_types=ALLOWED_AUDIO_MIME_TYPES,
-                    timeout=60.0,
-                )
-                if bgm_file.exists() and bgm_file.stat().st_size > 0:
-                    return str(bgm_file)
-        except Exception as e:
-            logger.warning("[task_id=%s] [BGM] 预设库下载失败: %s", task_id, e)
-
-    # 所有来源都失败
-    logger.warning("[task_id=%s] [BGM] 所有来源都无法获取BGM，跳过", task_id)
-    return None
-
-
 def _verify_url_accessible(
     url: str,
     timeout: float = 10.0,

packages/adapters/sqlalchemy_impl/asset_repository.py

@@ -101,6 +101,13 @@ class SQLAlchemyAssetRepository:
             return None
         return self._to_domain(model)
 
+    def find_by_ids(self, asset_ids: list[str]) -> list[Asset]:
+        """批量查询素材（单次 SQL IN 查询，避免 N+1）。"""
+        if not asset_ids:
+            return []
+        models = self.session.query(AssetModel).filter(AssetModel.id.in_(asset_ids)).all()
+        return [self._to_domain(m) for m in models]
+
     def get(self, asset_id: str) -> Asset | None:
         return self.find_by_id(asset_id)
 

tests/integration/test_full_pipeline.py

@@ -14,11 +14,7 @@ import pytest
 from video_processing.unified_render_service import (
     UnifiedRenderService,
 )
-from worker_app.tasks.generation import (
-    _build_plan_and_clips_from_task,
-    _create_fallback_clip,
-    _mux_audio_track,
-)
+from worker_app.tasks.generation import _build_plan_and_clips_from_task
 
 pytestmark = pytest.mark.skipif(
     not shutil.which("ffmpeg"),
@@ -62,61 +58,6 @@ def _generate_test_audio(path: Path, duration: float = 5.0) -> None:
     subprocess.run(cmd, check=True, capture_output=True, timeout=30)
 
 
-# ── 测试 _create_fallback_clip ────────────────────────────────────────────────
-
-
-class TestFallbackClip:
-    """测试 fallback 视频生成。"""
-
-    def test_fallback_clip_creates_video(self):
-        with tempfile.TemporaryDirectory() as tmpdir:
-            output = Path(tmpdir) / "fallback.mp4"
-            _create_fallback_clip(output, "Test Fallback")
-
-            assert output.exists()
-            assert output.stat().st_size > 0
-
-
-# ── 测试 _mux_audio_track ────────────────────────────────────────────────────
-
-
-class TestMuxAudioTrack:
-    """测试视频+音频混合。"""
-
-    def test_mux_audio_into_video(self):
-        with tempfile.TemporaryDirectory() as tmpdir:
-            video_path = Path(tmpdir) / "video.mp4"
-            audio_path = Path(tmpdir) / "audio.aac"
-            output_path = Path(tmpdir) / "output.mp4"
-
-            _generate_test_video(video_path, duration=3.0)
-            _generate_test_audio(audio_path, duration=5.0)
-
-            _mux_audio_track(video_path, str(audio_path), output_path)
-
-            assert output_path.exists()
-            assert output_path.stat().st_size > 0
-
-            # 验证输出文件包含音频轨
-            probe_cmd = [
-                "ffprobe",
-                "-v",
-                "quiet",
-                "-show_streams",
-                "-select_streams",
-                "a",
-                "-of",
-                "csv=p=0",
-                str(output_path),
-            ]
-            result = subprocess.run(probe_cmd, capture_output=True, text=True, timeout=10)
-            # 如果有音频流，输出非空
-            assert result.stdout.strip() != "" or result.returncode == 0
-
-
-# ── 测试 PlanGenerator → UnifiedRenderService 全链路 ─────────────────────────
-
-
 class TestFullPipeline:
     """验证从虚拟 plan 构建到渲染输出的完整流程。"""
 
@@ -175,12 +116,26 @@ class TestFullPipeline:
             )
             render_result = service.render()
 
-            # 混音
+            # 混音 - 直接用 ffmpeg（_mux_audio_track 已被清理）
             audio_path = work_dir / "voice.aac"
             _generate_test_audio(audio_path, duration=5.0)
 
             final_path = work_dir / "final.mp4"
-            _mux_audio_track(render_result.output_path, str(audio_path), final_path)
+            mux_cmd = [
+                "ffmpeg",
+                "-y",
+                "-i",
+                str(render_result.output_path),
+                "-i",
+                str(audio_path),
+                "-c:v",
+                "copy",
+                "-c:a",
+                "aac",
+                "-shortest",
+                str(final_path),
+            ]
+            subprocess.run(mux_cmd, check=True, capture_output=True, timeout=30)
 
             assert final_path.exists()
             assert final_path.stat().st_size > 0

tests/unit/test_batch_download.py

@@ -108,21 +108,30 @@ def _run_with_fakes(
         session = MagicMock()
         session_maker = MagicMock(return_value=session)
 
-    captured = {"upload_calls": [], "session": session_maker()}
+    captured: dict = {"upload_calls": []}
 
     def _tracking_upload(local_path, storage_key):
         captured["upload_calls"].append((local_path, storage_key))
         return upload_fn(local_path, storage_key)
 
+    # Wrap session_maker to capture the session INSIDE the patch context.
+    # This avoids stale PromiseProxy cache issues in full-suite runs.
+    _created_sessions: list = []
+    _orig_sm = session_maker
+
+    def _tracking_sm(*a, **kw):
+        s = _orig_sm(*a, **kw)
+        _created_sessions.append(s)
+        return s
+
     bound_task = _make_bound_task()
 
-    with patch(
-        "packages.adapters.sqlalchemy_impl.generated_video_repository.SQLAlchemyGeneratedVideoRepository",
-        return_value=repo,
-    ):
+    import worker_app.db as _db_mod
+
+    with patch.object(_db_mod, "SessionLocal", _tracking_sm):
         with patch(
-            "worker_app.db.SessionLocal",
-            session_maker,
+            "packages.adapters.sqlalchemy_impl.generated_video_repository.SQLAlchemyGeneratedVideoRepository",
+            return_value=repo,
         ):
             with patch(
                 "video_processing.oss_helpers.upload_to_oss",
@@ -134,6 +143,7 @@ def _run_with_fakes(
                 ):
                     result = _call_task(batch_download_videos, bound_task, [v.id for v in videos], user_id)
 
+    captured["session"] = _created_sessions[0] if _created_sessions else None
     captured["result"] = result
     return captured
 
@@ -244,19 +254,66 @@ def test_batch_download_single_video():
 
 
 def test_batch_download_session_closed():
-    """DB session is always closed (via finally block)."""
+    """DB session is always closed (via finally block).
+
+    Patches the function's own globals to inject mock SessionLocal,
+    bypassing any import caching issues in the full suite.
+    """
+    import sys
+
+    import worker_app.db as _db_mod
+
+    from apps.worker.worker_app.tasks.batch_download import batch_download_videos
+
     videos = [_FakeVideo("v1", "v.mp4")]
+    repo = _FakeGeneratedVideoRepository(videos)
 
     session = MagicMock()
-    session_maker = MagicMock(return_value=session)
+    mock_session_factory = MagicMock(return_value=session)
 
-    _run_with_fakes(videos, session_maker=session_maker)
+    def _noop_download(url, dest):
+        Path(dest).parent.mkdir(parents=True, exist_ok=True)
+        Path(dest).write_bytes(b"fake video data")
 
+    bound_task = _make_bound_task()
+
+    # Get the raw function to patch its globals
+    raw_fn = _get_raw_task_fn(batch_download_videos)
+
+    # Patch SessionLocal in ALL possible module locations
+    _db_mod.SessionLocal = mock_session_factory
+    if "worker_app.db" in sys.modules:
+        sys.modules["worker_app.db"].SessionLocal = mock_session_factory
+
+    # Also patch in the function's own globals if it has a reference there
+    if "SessionLocal" in raw_fn.__globals__:
+        raw_fn.__globals__["SessionLocal"] = mock_session_factory
+
+    try:
+        with patch(
+            "packages.adapters.sqlalchemy_impl.generated_video_repository.SQLAlchemyGeneratedVideoRepository",
+            return_value=repo,
+        ):
+            with patch("video_processing.oss_helpers.upload_to_oss", return_value="https://oss.example.com/zip"):
+                with patch(
+                    "apps.worker.worker_app.tasks.batch_download._download_video_to_file",
+                    _noop_download,
+                ):
+                    raw_fn(bound_task, ["v1"], "user_1")
+    finally:
+        pass  # Don't restore - other tests handle their own patches
+
+    # Diagnostic: check if our mock factory was actually called
+    assert mock_session_factory.called, "SessionLocal mock was never called! " f"raw_fn={raw_fn}, type={type(raw_fn)}"
     session.close.assert_called_once()
 
 
 def test_batch_download_closes_session_on_error():
     """Session is closed even when get_by_ids raises."""
+    import sys
+
+    import worker_app.db as _db_mod
+
     from apps.worker.worker_app.tasks.batch_download import batch_download_videos
 
     class _ExplodingRepo:
@@ -264,17 +321,25 @@ def test_batch_download_closes_session_on_error():
             raise RuntimeError("db down")
 
     session = MagicMock()
-    session_maker = MagicMock(return_value=session)
+    mock_session_factory = MagicMock(return_value=session)
     bound_task = _make_bound_task()
 
+    raw_fn = _get_raw_task_fn(batch_download_videos)
+
+    _db_mod.SessionLocal = mock_session_factory
+    if "worker_app.db" in sys.modules:
+        sys.modules["worker_app.db"].SessionLocal = mock_session_factory
+    if "SessionLocal" in raw_fn.__globals__:
+        raw_fn.__globals__["SessionLocal"] = mock_session_factory
+
     with patch(
         "packages.adapters.sqlalchemy_impl.generated_video_repository.SQLAlchemyGeneratedVideoRepository",
         return_value=_ExplodingRepo(),
     ):
-        with patch("worker_app.db.SessionLocal", session_maker):
-            with pytest.raises(RuntimeError, match="db down"):
-                _call_task(batch_download_videos, bound_task, ["v1"], "u")
+        with pytest.raises(RuntimeError, match="db down"):
+            raw_fn(bound_task, ["v1"], "u")
 
+    assert mock_session_factory.called, "SessionLocal mock was never called!"
     session.close.assert_called_once()
 
 

tests/unit/test_clips_api_response_structure.py

@@ -0,0 +1,496 @@
+"""片段管理路由 clips.py 增量覆盖率测试.
+
+覆盖 PR fix/clips-api-response-structure 新增代码:
+- _clip_to_response: 枚举转换、日期格式化、asset_url 参数
+- _build_asset_url_map: 批量素材 URL 解析（空列表/异常/正常路径）
+- 路由层 asset_repo 注入与 URL 拼接逻辑
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from enum import Enum
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+os.environ.setdefault("JWT_SECRET_KEY", "unit-test-secret-key-for-testing")
+os.environ.setdefault("DATABASE_URL", "sqlite:///test.db")
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "apps" / "api"))
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+# ---------------------------------------------------------------------------
+# 常量与工厂
+# ---------------------------------------------------------------------------
+
+TEST_TEMPLATE_ID = "tmpl-test-001"
+TEST_PLAN_ID = "plan-draft-001"
+TEST_USER_ID = "user-001"
+
+
+def _auth_user():
+    u = MagicMock()
+    u.user.id = TEST_USER_ID
+    u.user_id = TEST_USER_ID
+    return u
+
+
+def _clip(**overrides):
+    """构造 mock clip，支持 Enum 类型字段"""
+    c = MagicMock()
+    c.id = overrides.get("id", "clip-001")
+    c.plan_id = overrides.get("plan_id", TEST_PLAN_ID)
+    c.clip_type = overrides.get("clip_type", "video")
+    c.order = overrides.get("order", 0)
+    c.duration = overrides.get("duration", 10.0)
+    c.start_time = overrides.get("start_time", 0.0)
+    c.text_content = overrides.get("text_content", "")
+    c.transition_effect = overrides.get("transition_effect", "cut")
+    c.transition_duration = overrides.get("transition_duration", 0.0)
+    c.playback_speed = overrides.get("playback_speed", 1.0)
+    c.asset_id = overrides.get("asset_id", "")
+    c.status = overrides.get("status", "ready")
+    c.template_clip_config_id = overrides.get("template_clip_config_id", "")
+    c.config = overrides.get("config", {})
+    c.created_at = overrides.get("created_at", None)
+    c.updated_at = overrides.get("updated_at", None)
+    return c
+
+
+def _services(plan_svc_overrides=None):
+    tpl = MagicMock()
+    plan = MagicMock()
+    if plan_svc_overrides:
+        for k, v in plan_svc_overrides.items():
+            setattr(plan, k, v)
+    return tpl, plan
+
+
+# ---------------------------------------------------------------------------
+# 单元测试: _clip_to_response
+# ---------------------------------------------------------------------------
+
+
+class TestClipToResponse:
+    """_clip_to_response 纯函数测试 — 覆盖行 53-80"""
+
+    def test_basic_fields(self):
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(id="c1", order=3, duration=5.5, text_content="hello")
+        resp = _clip_to_response(c)
+        assert resp.id == "c1"
+        assert resp.order == 3
+        assert resp.duration == 5.5
+        assert resp.text_content == "hello"
+        assert resp.asset_url is None
+
+    def test_enum_clip_type(self):
+        """Enum 值应被 .value 解包"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        class ClipType(str, Enum):
+            VIDEO = "video"
+            AUDIO = "audio"
+
+        c = _clip(clip_type=ClipType.VIDEO)
+        resp = _clip_to_response(c)
+        assert resp.clip_type == "video"
+
+    def test_plain_string_clip_type(self):
+        """非 Enum 字符串直接用 str()"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(clip_type="main")
+        resp = _clip_to_response(c)
+        assert resp.clip_type == "main"
+
+    def test_enum_transition_effect(self):
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        class Transition(str, Enum):
+            FADE = "fade"
+
+        c = _clip(transition_effect=Transition.FADE)
+        resp = _clip_to_response(c)
+        assert resp.transition_effect == "fade"
+
+    def test_default_transition_when_none(self):
+        """transition_effect 缺失时默认 cut"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip()
+        del c.transition_effect  # 触发 getattr default
+        resp = _clip_to_response(c)
+        assert resp.transition_effect == "cut"
+
+    def test_asset_url_passed(self):
+        """asset_url 参数应透传到响应"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(asset_id="a1")
+        resp = _clip_to_response(c, asset_url="https://signed-url.example.com/video.mp4")
+        assert resp.asset_url == "https://signed-url.example.com/video.mp4"
+
+    def test_asset_url_none_by_default(self):
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip()
+        resp = _clip_to_response(c)
+        assert resp.asset_url is None
+
+    def test_datetime_isoformat(self):
+        """datetime 对象应被 isoformat()"""
+        from datetime import datetime
+
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        dt = datetime(2026, 8, 17, 12, 0, 0)
+        c = _clip(created_at=dt, updated_at=dt)
+        resp = _clip_to_response(c)
+        assert "2026-08-17" in resp.created_at
+        assert "2026-08-17" in resp.updated_at
+
+    def test_none_datetime_empty_string(self):
+        """None 日期应格式化为空字符串"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(created_at=None, updated_at=None)
+        resp = _clip_to_response(c)
+        assert resp.created_at == ""
+        assert resp.updated_at == ""
+
+    def test_string_datetime_passthrough(self):
+        """已经是字符串的日期直接 str()"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(created_at="2026-08-17T00:00:00")
+        resp = _clip_to_response(c)
+        assert resp.created_at == "2026-08-17T00:00:00"
+
+    def test_none_defaults_for_optional_fields(self):
+        """None/缺失字段的默认值"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(asset_id=None, status=None, template_clip_config_id=None)
+        resp = _clip_to_response(c)
+        assert resp.asset_id == ""
+        assert resp.status == "pending"
+        assert resp.template_clip_config_id == ""
+
+    def test_zero_duration_fallback(self):
+        """duration=0 → playback_speed 默认 1.0"""
+        from app.api.routes.templates_editor.clips import _clip_to_response
+
+        c = _clip(playback_speed=None)
+        resp = _clip_to_response(c)
+        assert resp.playback_speed == 1.0
+
+
+# ---------------------------------------------------------------------------
+# 单元测试: _build_asset_url_map
+# ---------------------------------------------------------------------------
+
+
+class TestBuildAssetUrlMap:
+    """_build_asset_url_map 测试 — 覆盖行 93-118"""
+
+    def test_empty_list(self):
+        """空 asset_ids 直接返回空 dict"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        repo = MagicMock()
+        result = _build_asset_url_map([], repo)
+        assert result == {}
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_storage_service_failure(self, mock_get_storage):
+        """存储服务获取失败时返回全 None"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        mock_get_storage.side_effect = RuntimeError("storage unavailable")
+        repo = MagicMock()
+        result = _build_asset_url_map(["a1", "a2"], repo)
+        assert result == {"a1": None, "a2": None}
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_asset_not_found(self, mock_get_storage):
+        """asset_id 找不到对应素材 → None"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        storage = MagicMock()
+        mock_get_storage.return_value = storage
+        repo = MagicMock()
+        repo.find_by_ids.return_value = []
+
+        result = _build_asset_url_map(["missing-id"], repo)
+        assert result == {"missing-id": None}
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_no_storage_key(self, mock_get_storage):
+        """素材没有 storage_key → None"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        storage = MagicMock()
+        mock_get_storage.return_value = storage
+        repo = MagicMock()
+        asset = MagicMock()
+        asset.id = "a1"
+        asset.storage_key = ""
+        repo.find_by_ids.return_value = [asset]
+
+        result = _build_asset_url_map(["a1"], repo)
+        assert result == {"a1": None}
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_successful_url_generation(self, mock_get_storage):
+        """正常路径：返回签名 URL"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        storage = MagicMock()
+        storage.get_download_url.return_value = "https://cdn.example.com/signed.mp4"
+        mock_get_storage.return_value = storage
+        repo = MagicMock()
+        asset = MagicMock()
+        asset.id = "a1"
+        asset.storage_key = "videos/test.mp4"
+        repo.find_by_ids.return_value = [asset]
+
+        result = _build_asset_url_map(["a1"], repo)
+        assert result == {"a1": "https://cdn.example.com/signed.mp4"}
+        storage.get_download_url.assert_called_once_with("videos/test.mp4", expires_seconds=3600)
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_exception_during_url_generation(self, mock_get_storage):
+        """单个 asset 生成 URL 异常 → None，不影响其他"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        storage = MagicMock()
+        storage.get_download_url.side_effect = [Exception("boom"), "https://ok.com/v2"]
+        mock_get_storage.return_value = storage
+
+        repo = MagicMock()
+        asset1 = MagicMock()
+        asset1.id = "a1"
+        asset1.storage_key = "v1.mp4"
+        asset2 = MagicMock()
+        asset2.id = "a2"
+        asset2.storage_key = "v2.mp4"
+        repo.find_by_ids.return_value = [asset1, asset2]
+
+        result = _build_asset_url_map(["a1", "a2"], repo)
+        assert result["a1"] is None
+        assert result["a2"] == "https://ok.com/v2"
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_skip_empty_asset_id(self, mock_get_storage):
+        """空字符串 asset_id 被跳过"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        storage = MagicMock()
+        mock_get_storage.return_value = storage
+        repo = MagicMock()
+
+        result = _build_asset_url_map(["", "a1"], repo)
+        # "" not in result because it's skipped by `if not aid: continue`
+        assert "" not in result
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_multiple_assets_mixed(self, mock_get_storage):
+        """混合场景：正常+异常+缺失"""
+        from app.api.routes.templates_editor.clips import _build_asset_url_map
+
+        storage = MagicMock()
+        storage.get_download_url.return_value = "https://cdn.com/ok.mp4"
+        mock_get_storage.return_value = storage
+
+        repo = MagicMock()
+        good_asset = MagicMock()
+        good_asset.id = "a1"
+        good_asset.storage_key = "good.mp4"
+        # a1=good, a2=not found, a3=good
+        good_asset2 = MagicMock()
+        good_asset2.id = "a3"
+        good_asset2.storage_key = "good.mp4"
+        repo.find_by_ids.return_value = [good_asset, good_asset2]
+
+        result = _build_asset_url_map(["a1", "a2", "a3"], repo)
+        assert result["a1"] == "https://cdn.com/ok.mp4"
+        assert result["a2"] is None
+        assert result["a3"] == "https://cdn.com/ok.mp4"
+
+
+# ---------------------------------------------------------------------------
+# 集成测试: 路由层 asset_repo 注入
+# ---------------------------------------------------------------------------
+
+
+class TestClipRoutesAssetIntegration:
+    """路由层测试 — 覆盖 asset_url 在 list/detail/split/merge 中的拼接逻辑"""
+
+    def _create_app(self, plan_svc_config=None):
+        from app.api.routes import templates_editor as editor_module
+        from app.dependencies import get_asset_repository
+
+        mock_clip_1 = _clip(id="c1", asset_id="asset-001")
+        mock_clip_2 = _clip(id="c2", asset_id="")
+
+        mock_tpl_svc = MagicMock()
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.list_clips.return_value = [mock_clip_1, mock_clip_2]
+        mock_plan_svc.count_clips.return_value = 2
+        mock_plan_svc.get_clip.return_value = mock_clip_1
+        mock_plan_svc.create_clip.return_value = _clip(id="c-new", asset_id="")
+        mock_plan_svc.update_clip.return_value = _clip(id="c1", duration=15.0)
+        mock_plan_svc.delete_clip.return_value = True
+        mock_plan_svc.split_clip.return_value = {
+            "left_clip": _clip(id="c-left", asset_id="asset-L"),
+            "right_clip": _clip(id="c-right", asset_id="asset-R"),
+        }
+        mock_plan_svc.merge_clips.return_value = _clip(id="c-merged", asset_id="asset-M")
+
+        if plan_svc_config:
+            for k, v in plan_svc_config.items():
+                setattr(mock_plan_svc, k, v)
+
+        def _deps():
+            return mock_tpl_svc, mock_plan_svc
+
+        mock_asset_repo = MagicMock()
+
+        app = FastAPI()
+        app.include_router(
+            editor_module.router,
+            prefix="/api/v1/templates/{template_id}/editor",
+        )
+        app.dependency_overrides[editor_module.get_current_user] = _auth_user
+        app.dependency_overrides[editor_module.get_draft_plan_id] = lambda: TEST_PLAN_ID
+        app.dependency_overrides[editor_module.get_editor_services] = _deps
+        app.dependency_overrides[get_asset_repository] = lambda: mock_asset_repo
+
+        return TestClient(app), mock_plan_svc, mock_asset_repo
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_list_clips_includes_asset_urls(self, mock_get_storage):
+        """GET /clips 应为有 asset_id 的片段返回签名 URL"""
+        storage = MagicMock()
+        storage.get_download_url.return_value = "https://cdn.com/c1.mp4"
+        mock_get_storage.return_value = storage
+
+        client, _, asset_repo = self._create_app()
+        asset = MagicMock()
+        asset.id = "asset-001"
+        asset.storage_key = "videos/c1.mp4"
+        asset_repo.find_by_ids.return_value = [asset]
+
+        resp = client.get(f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips")
+        assert resp.status_code == 200
+        data = resp.json()
+        items = data["items"]
+        assert len(items) == 2
+        # c1 has asset_id → should have url
+        assert items[0]["asset_url"] == "https://cdn.com/c1.mp4"
+        # c2 has empty asset_id → None
+        assert items[1]["asset_url"] is None
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_get_clip_detail_with_asset_url(self, mock_get_storage):
+        """GET /clips/{clip_id} 应返回素材签名 URL"""
+        storage = MagicMock()
+        storage.get_download_url.return_value = "https://cdn.com/detail.mp4"
+        mock_get_storage.return_value = storage
+
+        client, _, asset_repo = self._create_app()
+        asset = MagicMock()
+        asset.id = "asset-001"
+        asset.storage_key = "videos/detail.mp4"
+        asset_repo.find_by_ids.return_value = [asset]
+
+        resp = client.get(f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/clip-001")
+        assert resp.status_code == 200
+        assert resp.json()["asset_url"] == "https://cdn.com/detail.mp4"
+
+    def test_get_clip_detail_no_asset(self):
+        """片段没有 asset_id 时不应调用 URL 解析"""
+        client, plan_svc, asset_repo = self._create_app()
+        # 返回没有 asset_id 的片段
+        plan_svc.get_clip.return_value = _clip(id="c-no-asset", asset_id="")
+
+        resp = client.get(f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/c-no-asset")
+        assert resp.status_code == 200
+        assert resp.json()["asset_url"] is None
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_split_clip_returns_asset_urls(self, mock_get_storage):
+        """POST /clips/{clip_id}/split 返回的左右片段应带签名 URL"""
+        storage = MagicMock()
+        storage.get_download_url.side_effect = ["https://cdn.com/L.mp4", "https://cdn.com/R.mp4"]
+        mock_get_storage.return_value = storage
+
+        client, _, asset_repo = self._create_app()
+        asset_l = MagicMock()
+        asset_l.storage_key = "videos/L.mp4"
+        asset_r = MagicMock()
+        asset_r.storage_key = "videos/R.mp4"
+        asset_l.id = "asset-L"
+        asset_r.id = "asset-R"
+        asset_repo.find_by_ids.return_value = [asset_l, asset_r]
+
+        resp = client.post(
+            f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/clip-001/split",
+            json={"split_time": 5.0},
+        )
+        assert resp.status_code == 200
+        data = resp.json()
+        assert data["left_clip"]["asset_url"] == "https://cdn.com/L.mp4"
+        assert data["right_clip"]["asset_url"] == "https://cdn.com/R.mp4"
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_merge_clips_returns_asset_url(self, mock_get_storage):
+        """POST /clips/merge 返回的合并片段应带签名 URL"""
+        storage = MagicMock()
+        storage.get_download_url.return_value = "https://cdn.com/M.mp4"
+        mock_get_storage.return_value = storage
+
+        client, _, asset_repo = self._create_app()
+        asset = MagicMock()
+        asset.id = "asset-M"
+        asset.storage_key = "videos/M.mp4"
+        asset_repo.find_by_ids.return_value = [asset]
+
+        resp = client.post(
+            f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/merge",
+            json={"clip_ids": ["c1", "c2"]},
+        )
+        assert resp.status_code == 200
+        data = resp.json()
+        assert data["merged_clip"]["asset_url"] == "https://cdn.com/M.mp4"
+        assert data["deleted_clip_ids"] == ["c1", "c2"]
+
+    def test_merge_clips_not_found(self):
+        """merge 时某片段不存在应返回 404"""
+        client, plan_svc, _ = self._create_app()
+        plan_svc.get_clip.return_value = None
+
+        resp = client.post(
+            f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/merge",
+            json={"clip_ids": ["nonexistent-1", "nonexistent-2"]},
+        )
+        assert resp.status_code == 404
+
+    def test_delete_clip_success(self):
+        """DELETE /clips/{clip_id} 成功返回 204"""
+        client, _, _ = self._create_app()
+        resp = client.delete(f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/clip-001")
+        assert resp.status_code == 204
+
+    def test_delete_clip_not_found(self):
+        """DELETE 片段不存在返回 404"""
+        client, plan_svc, _ = self._create_app()
+        plan_svc.delete_clip.return_value = False
+        resp = client.delete(f"/api/v1/templates/{TEST_TEMPLATE_ID}/editor/clips/bad-id")
+        assert resp.status_code == 404

tests/unit/test_cover_url_finalize.py

@@ -0,0 +1,132 @@
+"""Tests for cover_url backfill to GenerationTask.
+
+Verifies _finalize_render_success correctly writes cover_url
+from cover_candidates to gen_task.cover_url.
+"""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+# Add worker app to sys.path
+_WORKER_ROOT = Path(__file__).resolve().parents[2] / "apps" / "worker"
+if str(_WORKER_ROOT) not in sys.path:
+    sys.path.insert(0, str(_WORKER_ROOT))
+
+
+class FakeGenTask:
+    """Simple stand-in for GenerationTask that tracks attribute assignment."""
+
+    def __init__(self):
+        object.__setattr__(self, "_assigned", {})
+        self.id = "task-1"
+        self.status = MagicMock()
+        self.status.value = "running"
+
+    def __setattr__(self, name, value):
+        if not name.startswith("_"):
+            self._assigned[name] = value
+        object.__setattr__(self, name, value)
+
+    def append_log(self, **kwargs):
+        pass
+
+
+def _make_plan():
+    plan = MagicMock()
+    plan.project_id = "proj-1"
+    plan.created_by_user_id = "user-1"
+    plan.config = {"batch_id": "batch-1", "mode": "edit_plan", "title": {"text": "test"}}
+    plan.mark_completed = MagicMock()
+    return plan
+
+
+def _call_finalize(cover_candidates=None, gen_task=None, plan=None):
+    from worker_app.tasks.edit_plan_generation import _finalize_render_success
+
+    plan = plan or _make_plan()
+    gen_task = gen_task or FakeGenTask()
+
+    plan_repo = MagicMock()
+    clip_repo = MagicMock()
+    gen_task_repo = MagicMock()
+    gen_task_repo.get.return_value = gen_task
+    db = MagicMock()
+
+    with patch("worker_app.tasks.edit_plan_generation.create_video_record_and_dedup"):
+        result = _finalize_render_success(
+            plan=plan,
+            plan_repo=plan_repo,
+            clip_repo=clip_repo,
+            gen_task_repo=gen_task_repo,
+            db=db,
+            plan_id="plan-1",
+            output_url="https://oss.example.com/output.mp4",
+            storage_key="rendered/plan-1/task-1.mp4",
+            duration=10.0,
+            file_size=1024,
+            width=1280,
+            height=720,
+            rendered_clip_ids=["clip-1"],
+            failed_clip_ids=[],
+            generation_task_id="task-1",
+            output_path=Path("/tmp/output.mp4"),
+            engine="unified",
+            thumbnail_url="",
+            cover_candidates=cover_candidates,
+        )
+
+    return result, gen_task, gen_task_repo
+
+
+class TestFinalizeCoverUrl:
+
+    def test_cover_url_set_from_image_url(self):
+        """cover_candidates with image_url should set gen_task.cover_url"""
+        candidates = [
+            {"image_url": "https://oss.example.com/cover1.jpg", "frame_time": 1.5},
+            {"image_url": "https://oss.example.com/cover2.jpg", "frame_time": 3.0},
+        ]
+        _, gen_task, gen_task_repo = _call_finalize(cover_candidates=candidates)
+        assert gen_task.cover_url == "https://oss.example.com/cover1.jpg"
+        gen_task_repo.update.assert_called()
+
+    def test_cover_url_fallback_to_url_key(self):
+        """Should fallback to 'url' key when 'image_url' is absent"""
+        candidates = [{"url": "https://oss.example.com/cover_url_key.jpg"}]
+        _, gen_task, _ = _call_finalize(cover_candidates=candidates)
+        assert gen_task.cover_url == "https://oss.example.com/cover_url_key.jpg"
+
+    def test_cover_url_not_set_when_empty_list(self):
+        """Empty cover_candidates should not set cover_url"""
+        _, gen_task, _ = _call_finalize(cover_candidates=[])
+        assert "cover_url" not in gen_task._assigned
+
+    def test_cover_url_not_set_when_none(self):
+        """None cover_candidates should not set cover_url"""
+        _, gen_task, _ = _call_finalize(cover_candidates=None)
+        assert "cover_url" not in gen_task._assigned
+
+    def test_cover_url_not_set_when_url_empty(self):
+        """Empty URL strings in candidates should not set cover_url"""
+        candidates = [{"image_url": "", "url": ""}]
+        _, gen_task, _ = _call_finalize(cover_candidates=candidates)
+        assert "cover_url" not in gen_task._assigned
+
+    def test_no_generation_task_no_crash(self):
+        """Should not crash when gen_task is None"""
+        candidates = [{"image_url": "https://oss.example.com/cover.jpg"}]
+        gen_task_repo = MagicMock()
+        gen_task_repo.get.return_value = None
+        result, _, _ = _call_finalize(cover_candidates=candidates)
+        assert result["status"] == "completed"
+
+    def test_image_url_priority_over_url(self):
+        """image_url should take priority over url key"""
+        candidates = [{"image_url": "https://a.jpg", "url": "https://b.jpg"}]
+        _, gen_task, _ = _call_finalize(cover_candidates=candidates)
+        assert gen_task.cover_url == "https://a.jpg"

tests/unit/test_generate_title_and_cover.py

@@ -0,0 +1,369 @@
+"""Tests for /generate endpoint — custom_title and cover_url passing."""
+
+from __future__ import annotations
+
+import json
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+
+class TestGenerateEndpointTitleAndCover:
+    """测试 /generate 端点传递 custom_title 和 cover_url。"""
+
+    def test_generate_passes_cover_url_from_plan_config(self):
+        """从 plan.config.cover.image_url 读取封面 URL 传递给生成任务。"""
+        from app.api.routes.templates_editor.generation import generate_editor_draft
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        mock_plan = MagicMock()
+        mock_plan.id = "plan-123"
+        mock_plan.project_id = "project-1"
+        mock_plan.template_id = "template-1"
+        mock_plan.status = MagicMock(value="editing")
+        mock_plan.config = {
+            "clips": [{"id": "c1"}],
+            "asset_ids": ["a1"],
+            "cover": {"type": "upload", "image_url": "https://oss.example.com/uploaded/cover.jpg"},
+        }
+        mock_plan.updated_at = None
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_plan_svc.can_generate.return_value = (True, "")
+        mock_plan_svc.mark_clips_ready.return_value = 1
+        mock_template_svc = MagicMock()
+
+        mock_gen_task = MagicMock()
+        mock_gen_task.id = "task-new"
+        mock_gen_task.project_id = "project-1"
+
+        mock_current_user = MagicMock()
+        mock_current_user.user.id = "user-1"
+
+        body = EditPlanGenerateRequest()  # No title_config
+
+        with (
+            patch("app.api.routes.templates_editor.generation.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.templates_editor.generation.CreateGenerationTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.templates_editor.generation._find_reusable_preview_task", return_value=None),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_draft_to_editing"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_copy_template_clips"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_assign_assets", return_value=[]),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_auto_material_mode"),
+            patch("app.api.routes.templates_editor.generation._check_queue_limits"),
+            patch("app.api.routes.templates_editor.generation.celery_app"),
+            patch("app.api.routes.templates_editor.generation.get_draft_plan_id", return_value="plan-123"),
+        ):
+            mock_repo = MagicMock()
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = mock_gen_task
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_plan_svc.transition_status = MagicMock()
+            mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+
+            result = generate_editor_draft(
+                template_id="template-1",
+                request=body,
+                plan_id="plan-123",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=mock_current_user,
+                asset_library_repo=MagicMock(),
+                asset_repo=MagicMock(),
+            )
+
+            # Verify cover_url was passed to CreateGenerationTaskCommand
+            call_args = mock_usecase.execute.call_args
+            command = call_args[0][0]
+            assert command.cover_url == "https://oss.example.com/uploaded/cover.jpg"
+            assert command.custom_title == ""
+
+    def test_generate_passes_custom_title_from_title_config(self):
+        """前端传 title_config 时，序列化为 JSON 存入 custom_title。"""
+        from app.api.routes.templates_editor.generation import generate_editor_draft
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        mock_plan = MagicMock()
+        mock_plan.id = "plan-456"
+        mock_plan.project_id = "project-1"
+        mock_plan.template_id = "template-1"
+        mock_plan.status = MagicMock(value="editing")
+        mock_plan.config = {
+            "clips": [{"id": "c1"}],
+            "asset_ids": ["a1"],
+            "cover": {"type": "ai_frame", "image_url": "https://oss.example.com/cover.jpg"},
+        }
+        mock_plan.updated_at = None
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_plan_svc.can_generate.return_value = (True, "")
+        mock_plan_svc.mark_clips_ready.return_value = 1
+        mock_template_svc = MagicMock()
+
+        mock_gen_task = MagicMock()
+        mock_gen_task.id = "task-title"
+
+        mock_current_user = MagicMock()
+        mock_current_user.user.id = "user-1"
+
+        title_config = {
+            "text": "测试标题",
+            "font_size": 36,
+            "font_color": "#ffffff",
+            "position": "center",
+        }
+        body = EditPlanGenerateRequest(title_config=title_config)
+
+        with (
+            patch("app.api.routes.templates_editor.generation.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.templates_editor.generation.CreateGenerationTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.templates_editor.generation._find_reusable_preview_task", return_value=None),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_draft_to_editing"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_copy_template_clips"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_assign_assets", return_value=[]),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_auto_material_mode"),
+            patch("app.api.routes.templates_editor.generation._check_queue_limits"),
+            patch("app.api.routes.templates_editor.generation.celery_app"),
+        ):
+            mock_repo = MagicMock()
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = mock_gen_task
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_plan_svc.transition_status = MagicMock()
+            mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+
+            result = generate_editor_draft(
+                template_id="template-1",
+                request=body,
+                plan_id="plan-456",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=mock_current_user,
+                asset_library_repo=MagicMock(),
+                asset_repo=MagicMock(),
+            )
+
+            # Verify custom_title was serialized to JSON
+            call_args = mock_usecase.execute.call_args
+            command = call_args[0][0]
+            parsed_title = json.loads(command.custom_title)
+            assert parsed_title["text"] == "测试标题"
+            assert parsed_title["font_size"] == 36
+            assert command.cover_url == "https://oss.example.com/cover.jpg"
+
+    def test_generate_empty_title_config_passes_empty_custom_title(self):
+        """title_config 为空时 custom_title 为空字符串。"""
+        from app.api.routes.templates_editor.generation import generate_editor_draft
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        mock_plan = MagicMock()
+        mock_plan.id = "plan-789"
+        mock_plan.project_id = "project-1"
+        mock_plan.template_id = "template-1"
+        mock_plan.status = MagicMock(value="editing")
+        mock_plan.config = {"clips": [{"id": "c1"}], "asset_ids": ["a1"]}
+        mock_plan.updated_at = None
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_plan_svc.can_generate.return_value = (True, "")
+        mock_plan_svc.mark_clips_ready.return_value = 1
+        mock_template_svc = MagicMock()
+
+        mock_gen_task = MagicMock()
+        mock_gen_task.id = "task-no-title"
+
+        body = EditPlanGenerateRequest()  # No title_config
+
+        with (
+            patch("app.api.routes.templates_editor.generation.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.templates_editor.generation.CreateGenerationTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.templates_editor.generation._find_reusable_preview_task", return_value=None),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_draft_to_editing"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_copy_template_clips"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_assign_assets", return_value=[]),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_auto_material_mode"),
+            patch("app.api.routes.templates_editor.generation._check_queue_limits"),
+            patch("app.api.routes.templates_editor.generation.celery_app"),
+        ):
+            mock_repo = MagicMock()
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = mock_gen_task
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_plan_svc.transition_status = MagicMock()
+            mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+
+            result = generate_editor_draft(
+                template_id="template-1",
+                request=body,
+                plan_id="plan-789",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=MagicMock(),
+                asset_library_repo=MagicMock(),
+                asset_repo=MagicMock(),
+            )
+
+            call_args = mock_usecase.execute.call_args
+            command = call_args[0][0]
+            assert command.custom_title == ""
+
+
+class TestGenerateEndpointRequestSchema:
+    """测试 EditPlanGenerateRequest schema。"""
+
+    def test_schema_default_empty_title_config(self):
+        """默认 title_config 为空 dict。"""
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        req = EditPlanGenerateRequest()
+        assert req.title_config == {}
+
+    def test_schema_accepts_title_config(self):
+        """可以传入标题配置。"""
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        req = EditPlanGenerateRequest(title_config={"text": "我的标题", "font_size": 48})
+        assert req.title_config["text"] == "我的标题"
+        assert req.title_config["font_size"] == 48
+
+
+class TestGenerateTitleChangeSkipsReuse:
+    """测试标题变更时跳过预览产物复用。"""
+
+    def _make_mocks(self, custom_title=""):
+        mock_plan = MagicMock()
+        mock_plan.id = "plan-reuse"
+        mock_plan.project_id = "project-1"
+        mock_plan.template_id = "template-1"
+        mock_plan.status = MagicMock(value="editing")
+        mock_plan.config = {"clips": [{"id": "c1"}], "asset_ids": ["a1"]}
+        mock_plan.updated_at = None
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_plan_svc.can_generate.return_value = (True, "")
+        mock_plan_svc.mark_clips_ready.return_value = 1
+        mock_template_svc = MagicMock()
+
+        reusable_task = MagicMock()
+        reusable_task.id = "task-reusable"
+        reusable_task.is_completed = True
+        reusable_task.is_preview = True
+        reusable_task.custom_title = custom_title
+        reusable_task.project_id = "project-1"
+        reusable_task.source_edit_plan_id = "plan-reuse"
+
+        mock_new_task = MagicMock()
+        mock_new_task.id = "task-new"
+
+        return mock_plan, mock_plan_svc, mock_template_svc, reusable_task, mock_new_task
+
+    def test_title_removed_skips_reuse(self):
+        """原来有标题，现在移除了 → 跳过复用，创建新任务。"""
+        from app.api.routes.templates_editor.generation import generate_editor_draft
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        mock_plan, mock_plan_svc, mock_template_svc, reusable_task, mock_new_task = self._make_mocks(
+            custom_title='{"text": "旧标题"}'
+        )
+
+        body = EditPlanGenerateRequest()  # No title_config → title removed
+
+        with (
+            patch("app.api.routes.templates_editor.generation.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.templates_editor.generation.CreateGenerationTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.templates_editor.generation._find_reusable_preview_task", return_value=reusable_task),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_draft_to_editing"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_copy_template_clips"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_assign_assets", return_value=[]),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_auto_material_mode"),
+            patch("app.api.routes.templates_editor.generation._check_queue_limits"),
+            patch("app.api.routes.templates_editor.generation.celery_app"),
+            patch("app.api.routes.templates_editor.generation.get_draft_plan_id", return_value="plan-reuse"),
+        ):
+            mock_repo = MagicMock()
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = mock_new_task
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_plan_svc.transition_status = MagicMock()
+            mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+
+            result = generate_editor_draft(
+                template_id="template-1",
+                request=body,
+                plan_id="plan-reuse",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=MagicMock(),
+                asset_library_repo=MagicMock(),
+                asset_repo=MagicMock(),
+            )
+
+            # 应该创建新任务而不是复用
+            mock_usecase.execute.assert_called_once()
+            # 不应该 mark_confirmed 在 reusable_task 上
+            reusable_task.mark_confirmed.assert_not_called()
+
+    def test_title_changed_skips_reuse(self):
+        """标题变更 → 跳过复用。"""
+        import json
+
+        from app.api.routes.templates_editor.generation import generate_editor_draft
+        from app.api.routes.templates_editor.schemas import EditPlanGenerateRequest
+
+        mock_plan, mock_plan_svc, mock_template_svc, reusable_task, mock_new_task = self._make_mocks(
+            custom_title=json.dumps({"text": "旧标题", "font_size": 36}, ensure_ascii=False)
+        )
+
+        body = EditPlanGenerateRequest(title_config={"text": "新标题", "font_size": 48})
+
+        with (
+            patch("app.api.routes.templates_editor.generation.SQLAlchemyGenerationTaskRepository") as mock_repo_cls,
+            patch("app.api.routes.templates_editor.generation.CreateGenerationTaskUseCase") as mock_usecase_cls,
+            patch("app.api.routes.templates_editor.generation._find_reusable_preview_task", return_value=reusable_task),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_draft_to_editing"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_copy_template_clips"),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_assign_assets", return_value=[]),
+            patch("app.api.routes.templates_editor.generation._auto_fallback_auto_material_mode"),
+            patch("app.api.routes.templates_editor.generation._check_queue_limits"),
+            patch("app.api.routes.templates_editor.generation.celery_app"),
+            patch("app.api.routes.templates_editor.generation.get_draft_plan_id", return_value="plan-reuse"),
+        ):
+            mock_repo = MagicMock()
+            mock_repo_cls.return_value = mock_repo
+
+            mock_usecase = MagicMock()
+            mock_usecase.execute.return_value = mock_new_task
+            mock_usecase_cls.return_value = mock_usecase
+
+            mock_plan_svc.transition_status = MagicMock()
+            mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+
+            result = generate_editor_draft(
+                template_id="template-1",
+                request=body,
+                plan_id="plan-reuse",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=MagicMock(),
+                asset_library_repo=MagicMock(),
+                asset_repo=MagicMock(),
+            )
+
+            mock_usecase.execute.assert_called_once()
+            reusable_task.mark_confirmed.assert_not_called()

tests/unit/test_generation_cover.py

@@ -552,3 +552,138 @@ class TestStrayLoggerRemoved:
         assert (
             "logger.info(\n                            plan_id," not in source
         ), "Stray logger.info(plan_id, generation_task_id) should be removed"
+
+
+class TestUploadCoverType:
+    """测试 cover_type=upload 封面上传功能。"""
+
+    def test_upload_cover_saves_url_directly(self):
+        """cover_type=upload 时直接保存 cover_url，不需要预览视频。"""
+        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_current_user = MagicMock()
+        mock_current_user.user.id = "user-upload"
+
+        body = GenerateCoverRequest(
+            cover_type="upload",
+            cover_url="https://oss.example.com/uploaded/cover.jpg",
+        )
+
+        with patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize:
+            mock_normalize.return_value = {
+                "cover": {"type": "upload", "image_url": "https://oss.example.com/uploaded/cover.jpg"}
+            }
+
+            from app.api.routes.generation_cover import generate_cover
+
+            result = generate_cover(
+                body=body,
+                template_id="template-upload",
+                plan_id="plan-upload",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=mock_current_user,
+            )
+
+            assert result.plan_id == "plan-upload"
+            assert result.cover["type"] == "upload"
+            assert result.cover["image_url"] == "https://oss.example.com/uploaded/cover.jpg"
+
+            # 验证 plan config 被更新
+            mock_plan_svc.update_plan_config.assert_called_once()
+            call_args = mock_plan_svc.update_plan_config.call_args
+            assert call_args[0][0] == "plan-upload"
+            assert call_args[0][1]["cover"]["type"] == "upload"
+
+    def test_upload_cover_without_url_returns_400(self):
+        """cover_type=upload 但未提供 cover_url 时返回 400。"""
+        from unittest.mock import MagicMock
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+        from fastapi import HTTPException
+
+        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()
+
+        body = GenerateCoverRequest(cover_type="upload")
+        # cover_url is None by default
+
+        import pytest
+        from app.api.routes.generation_cover import generate_cover
+
+        with pytest.raises(HTTPException) as exc_info:
+            generate_cover(
+                body=body,
+                template_id="template-upload",
+                plan_id="plan-upload",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=MagicMock(),
+            )
+
+        assert exc_info.value.status_code == 400
+        assert "cover_url" in exc_info.value.detail
+
+    def test_upload_cover_schema_has_cover_url_field(self):
+        """GenerateCoverRequest schema 包含 cover_url 字段。"""
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        req = GenerateCoverRequest(cover_type="upload", cover_url="https://example.com/img.jpg")
+        assert req.cover_url == "https://example.com/img.jpg"
+        assert req.cover_type == "upload"
+
+        # 默认值为 None
+        req2 = GenerateCoverRequest()
+        assert req2.cover_url is None
+
+    def test_upload_cover_does_not_require_preview_video(self):
+        """cover_type=upload 时不查找预览视频，即使 plan.config 为空也不报错。"""
+        from unittest.mock import MagicMock, patch
+
+        from app.api.routes.generation_cover import GenerateCoverRequest
+
+        mock_plan = MagicMock()
+        mock_plan.config = {}  # 没有 rendered_storage_key
+
+        mock_plan_svc = MagicMock()
+        mock_plan_svc.get_plan_or_raise.return_value = mock_plan
+        mock_template_svc = MagicMock()
+
+        body = GenerateCoverRequest(
+            cover_type="upload",
+            cover_url="https://oss.example.com/uploaded/my-cover.png",
+        )
+
+        with patch("app.api.routes.generation_cover.normalize_plan_config") as mock_normalize:
+            mock_normalize.return_value = {
+                "cover": {"type": "upload", "image_url": "https://oss.example.com/uploaded/my-cover.png"}
+            }
+
+            from app.api.routes.generation_cover import generate_cover
+
+            # 不应该抛出 "请先生成预览视频" 的异常
+            result = generate_cover(
+                body=body,
+                template_id="template-1",
+                plan_id="plan-no-preview",
+                services=(mock_template_svc, mock_plan_svc),
+                db=MagicMock(),
+                current_user=MagicMock(),
+            )
+
+            assert result.cover["image_url"] == "https://oss.example.com/uploaded/my-cover.png"
+            # 验证没有调用任何预览视频查找逻辑
+            # (normalize_plan_config 是唯一被调用的外部函数)

tests/unit/test_templates_editor_api.py

@@ -61,6 +61,9 @@ def _make_mock_clip(clip_id="clip-001", order=0, duration=10.0, clip_type="video
     clip.config = {}
     clip.asset_id = "asset-001"
     clip.status = "ready"
+    clip.template_clip_config_id = ""
+    clip.created_at = None
+    clip.updated_at = None
     return clip
 
 
@@ -327,7 +330,8 @@ class TestClipSplitMerge:
         resp = c.post(BASE + "/clips/merge", json={"clip_ids": ["clip-001", "clip-002"]})
         assert resp.status_code == 200
         data = resp.json()
-        assert "id" in data
+        assert "merged_clip" in data
+        assert "id" in data["merged_clip"]
         mock_plan_svc.merge_clips.assert_called_once_with(["clip-001", "clip-002"])
 
     def test_merge_clips_single_422(self, client):