style: auto-format with black + isort + prettier [skip ci-format-check]

覆盖场景：
- HEVC 编码检测（hevc/h265/hvh1，不区分大小写）
- H.264 视频不触发转码
- 转码后文件命名规则（_h264 后缀）
- 元数据提取失败时的脏数据防护（AI Code Review BUG 修复）
- FFmpeg 超时/错误降级策略
- Scale filter 逻辑（4K/1080p/720p）
- 安全修复（NamedTemporaryFile 替代 mktemp）
- 稳定性修复（stdout=DEVNULL, stderr=PIPE）
- FFmpeg 命令参数验证

16 个测试用例，全部通过

.gitea/workflows/api-base-image.yml

@@ -0,0 +1,84 @@
+name: API Base Image Build
+
+on:
+  push:
+    branches:
+      - develop
+      - main
+    paths:
+      - 'requirements-base.txt'
+      - 'requirements.txt'
+      - 'infra/docker/api-base.Dockerfile'
+  workflow_dispatch:
+
+jobs:
+  build-api-base:
+    name: Build API Base Image
+    runs-on: runtime-builder
+    timeout-minutes: 45
+    steps:
+    - name: Checkout code
+      shell: sh
+      env:
+        GITHUB_TOKEN: ${{ github.token }}
+      run: |
+        curl -sH "Authorization: token $GITHUB_TOKEN" \
+          "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/raw/scripts/ci/step_checkout.sh?ref=${GITHUB_SHA}" \
+          | bash
+
+    - name: Docker login to Registry
+      shell: sh
+      env:
+        ACR_USERNAME: ${{ secrets.ACR_USERNAME }}
+        ACR_PASSWORD: ${{ secrets.ACR_PASSWORD }}
+        GITEA_REGISTRY_USER: xiaoxia
+        GITEA_REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+      run: |
+        set -eu
+        for i in 1 2 3; do
+          echo "=== Docker login 尝试 $i/3 ==="
+          if printf '%s' "${ACR_PASSWORD}" | docker login xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com -u "${ACR_USERNAME}" --password-stdin \
+              && docker login git.xiaoxiajianji.com -u "${GITEA_REGISTRY_USER}" -p "${GITEA_REGISTRY_TOKEN}"; then
+            echo "✅ Docker login successful"
+            break
+          fi
+          echo "❌ Docker login 失败（尝试 $i/3），5s 后重试..."
+          sleep 5
+        done
+
+    - name: Build and push API base image
+      shell: sh
+      run: |
+        set -eu
+        ACR_IMAGE="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji/saas-api-base:latest"
+        GITEA_IMAGE="git.xiaoxiajianji.com/xiaoxia-saas/saas-api-base:latest"
+
+        echo "=== Building API base image ==="
+
+        # 使用普通 docker build（单平台不需要 buildx）
+        docker build \
+          -f infra/docker/api-base.Dockerfile \
+          -t "${ACR_IMAGE}" \
+          .
+
+        echo ""
+        echo "✅ Image built successfully"
+
+        # 推送到 ACR
+        echo "=== Pushing to ACR ==="
+        docker push "${ACR_IMAGE}"
+        echo "✅ Pushed to ACR"
+
+        # 打标签并推送到 Gitea Packages 作为备份
+        echo "=== Pushing to Gitea Packages ==="
+        docker tag "${ACR_IMAGE}" "${GITEA_IMAGE}"
+        docker push "${GITEA_IMAGE}" || echo "⚠️ Gitea Packages push failed (non-fatal)"
+        echo "✅ Gitea backup push completed"
+
+    - name: Cleanup
+      if: always()
+      shell: sh
+      run: |
+        ACR_IMAGE="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji/saas-api-base:latest"
+        docker rmi "${ACR_IMAGE}" 2>/dev/null || true
+        echo "Cleanup done"

.gitea/workflows/ci-pipeline.yml

@@ -633,58 +633,25 @@ jobs:
           echo "Docker login failed ($i/3), retrying in 5s..."
           sleep 5
         done
-    - name: Pre-build worker base images (fallback if not exist)
+    - name: Pre-build worker base image (fallback if not exist)
       if: matrix.service == 'worker'
       id: prebuild
       shell: sh
       run: |
         set -eu
-        REGISTRY="git.xiaoxiajianji.com/xiaoxia-saas"
-        BASE_BUILDER="${REGISTRY}/worker-base-builder:latest"
-        BASE_RUNTIME="${REGISTRY}/worker-base-runtime:latest"
+        REGISTRY="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji"
+        BASE_IMAGE="${REGISTRY}/saas-worker-base:latest"
         
         # 尝试拉取基础镜像
-        echo "检查基础镜像..."
-        if docker pull "$BASE_BUILDER" 2>/dev/null && docker pull "$BASE_RUNTIME" 2>/dev/null; then
-          echo "基础镜像已存在，使用远程镜像"
+        echo "检查 Worker 基础镜像..."
+        if docker pull "$BASE_IMAGE" 2>/dev/null; then
+          echo "✅ 基础镜像已存在"
           echo "fallback=false" >> $GITHUB_OUTPUT
         else
-          echo "基础镜像不存在，本地构建（fallback模式）..."
-          
-          # 尝试用buildx构建，失败则回退到普通docker build（DooD模式下buildx builder偶发崩溃）
-          BUILDER_NAME="ci-pr-builder-${GITHUB_RUN_ID:-local}"
-          BUILDX_AVAILABLE=true
-          if ! docker buildx create --use --name "$BUILDER_NAME" --driver docker-container > /dev/null 2>&1; then
-            BUILDX_AVAILABLE=false
-          fi
-          if [ "$BUILDX_AVAILABLE" = true ] && ! docker buildx inspect --bootstrap > /dev/null 2>&1; then
-            BUILDX_AVAILABLE=false
-            docker buildx rm "$BUILDER_NAME" > /dev/null 2>&1 || true
-          fi
-          
-          build_base() {
-            local df="$1"
-            local tag="$2"
-            local name="$3"
-            if [ "$BUILDX_AVAILABLE" = true ]; then
-              echo "构建 $name（buildx）..."
-              if docker buildx build --load -f "$df" -t "$tag" . > /dev/null 2>&1; then
-                echo "$name 构建成功"
-                return 0
-              fi
-              echo "buildx失败，回退到普通docker build"
-              BUILDX_AVAILABLE=false
-              docker buildx rm "$BUILDER_NAME" > /dev/null 2>&1 || true
-            fi
-            echo "构建 $name（docker build）..."
-            docker build -f "$df" -t "$tag" .
-          }
-          
-          build_base infra/docker/worker-base-builder.Dockerfile "$BASE_BUILDER" "worker-base-builder"
-          build_base infra/docker/worker-base-runtime.Dockerfile "$BASE_RUNTIME" "worker-base-runtime"
-          
+          echo "⚠️ 基础镜像不存在，本地构建（fallback模式）..."
+          docker build -f infra/docker/worker-base.Dockerfile -t "$BASE_IMAGE" .
           echo "fallback=true" >> $GITHUB_OUTPUT
-          echo "基础镜像本地构建完成"
+          echo "✅ Worker 基础镜像本地构建完成"
         fi
 
     - name: Build PR image (verify only, no push)
@@ -700,15 +667,15 @@ jobs:
           EXTRA_BUILD_ARGS="$EXTRA_BUILD_ARGS NGINX_CONF=infra/docker/nginx-staging.conf"
         fi
 
-        # Worker fallback模式：基础镜像本地已构建，用普通docker build绕过buildx
-        if [ "${{ matrix.service }}" = "worker" ] && [ "${{ steps.prebuild.outputs.fallback }}" = "true" ]; then
-          echo "Fallback模式：用普通docker build（基础镜像本地已构建）"
+        # Worker: 始终用普通docker build（基础镜像已预装全部依赖，无需buildx）
+        if [ "${{ matrix.service }}" = "worker" ]; then
+          echo "Worker: 使用普通docker build"
           BUILD_ARG_STR=""
           for arg in $EXTRA_BUILD_ARGS; do
             BUILD_ARG_STR="$BUILD_ARG_STR --build-arg $arg"
           done
           docker build -f ${{ matrix.dockerfile }} -t "${IMAGE_TAG}" $BUILD_ARG_STR .
-          echo "Fallback PR Build successful"
+          echo "PR Build successful (worker, no buildx)"
           exit 0
         fi
 
@@ -831,6 +798,7 @@ jobs:
         fi
 
     - name: Setup buildx builder
+      if: matrix.service != 'worker'
       shell: sh
       run: |
         set -eu
@@ -843,41 +811,64 @@ jobs:
         fi
         docker buildx inspect --bootstrap
 
-    - name: Build and push ${{ matrix.service_display }} image (with retry)
+    - name: Pre-build worker base image (fallback if not exist)
+      if: matrix.service == 'worker'
+      shell: sh
+      run: |
+        set -eu
+        REGISTRY="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji"
+        BASE_IMAGE="${REGISTRY}/saas-worker-base:latest"
+
+        echo "检查 Worker 基础镜像..."
+        if docker pull "$BASE_IMAGE" 2>/dev/null; then
+          echo "✅ 基础镜像已存在"
+        else
+          echo "⚠️ 基础镜像不存在，本地构建（fallback）..."
+          docker build -f infra/docker/worker-base.Dockerfile -t "$BASE_IMAGE" .
+          echo "✅ Worker 基础镜像本地构建完成"
+        fi
+
+    - name: Build and push ${{ matrix.service_display }} image
       shell: sh
       run: |
         set -eu
         REGISTRY="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji"
         IMAGE_TAG="${REGISTRY}/${{ matrix.image_name }}:${GITHUB_SHA}"
-        CACHE_REF="${REGISTRY}/${{ matrix.cache_name }}:${GITHUB_REF_NAME}"
 
-        EXTRA_BUILD_ARGS="APP_VERSION=\"${GITHUB_SHA}\""
-        if [ "${{ matrix.service }}" = "web" ]; then
-          EXTRA_BUILD_ARGS="$EXTRA_BUILD_ARGS NGINX_CONF=infra/docker/nginx-staging.conf"
+        if [ "${{ matrix.service }}" = "worker" ]; then
+          # Worker: plain docker build（基础镜像已预装全部依赖，无需 buildx）
+          echo "=== Worker: plain docker build ==="
+          docker build -f ${{ matrix.dockerfile }} -t "${IMAGE_TAG}" --build-arg APP_VERSION="${GITHUB_SHA}" .
+          docker push "${IMAGE_TAG}"
+          echo "✅ Worker image pushed: ${IMAGE_TAG}"
+        else
+          # API/Web: buildx with registry cache
+          CACHE_REF="${REGISTRY}/${{ matrix.cache_name }}:${GITHUB_REF_NAME}"
+          EXTRA_BUILD_ARGS="APP_VERSION=\"${GITHUB_SHA}\""
+          if [ "${{ matrix.service }}" = "web" ]; then
+            EXTRA_BUILD_ARGS="$EXTRA_BUILD_ARGS NGINX_CONF=infra/docker/nginx-staging.conf"
+          fi
+
+          NO_CACHE_FLAG=""
+          for i in 1 2 3; do
+            echo "=== Docker build 尝试 $i/3 ==="
+            if bash scripts/ci/docker_build_push.sh $NO_CACHE_FLAG ${{ matrix.dockerfile }} "${IMAGE_TAG}" "${CACHE_REF}" $EXTRA_BUILD_ARGS; then
+              echo "✅ Docker build 成功"
+              break
+            fi
+            echo "❌ Docker build 失败（尝试 $i/3）"
+            [ $i -eq 3 ] && exit 1
+            sleep 10
+            if [ $i -eq 2 ]; then
+              NO_CACHE_FLAG="--no-cache"
+              echo "下次重试将使用 --no-cache"
+            fi
+          done
+
+          echo "${{ matrix.service_display }} image pushed: ${IMAGE_TAG}"
         fi
-
-        # Docker build 带重试：失败自动重试2次，第2次重试加--no-cache
-        NO_CACHE_FLAG=""
-        for i in 1 2 3; do
-          echo "=== Docker build 尝试 $i/3 ==="
-          if bash scripts/ci/docker_build_push.sh $NO_CACHE_FLAG ${{ matrix.dockerfile }} "${IMAGE_TAG}" "${CACHE_REF}" $EXTRA_BUILD_ARGS; then
-            echo "✅ Docker build 成功"
-            break
-          fi
-          echo "❌ Docker build 失败（尝试 $i/3）"
-          [ $i -eq 3 ] && exit 1
-          sleep 10
-          # 第2次重试使用 --no-cache
-          if [ $i -eq 2 ]; then
-            NO_CACHE_FLAG="--no-cache"
-            echo "下次重试将使用 --no-cache"
-          fi
-        done
-
-        echo
-        echo "${{ matrix.service_display }} image pushed: ${IMAGE_TAG}"
     - name: Cleanup buildx builder
-      if: always()
+      if: matrix.service != 'worker' && always()
       shell: sh
       run: |
         docker buildx rm ci-builder-${GITHUB_RUN_ID}-${GITHUB_JOB}-${{ matrix.cache_name }} 2>/dev/null || true

.gitea/workflows/worker-base-image.yml

@@ -7,35 +7,25 @@ on:
       - main
     paths:
       - 'requirements-base.txt'
+      - 'requirements.txt'
       - 'requirements-worker.txt'
-      - 'infra/docker/worker-base-builder.Dockerfile'
-      - 'infra/docker/worker-base-runtime.Dockerfile'
-  workflow_dispatch:  # 支持手动触发
+      - 'infra/docker/worker-base.Dockerfile'
+  workflow_dispatch:
 
 jobs:
   build-worker-base:
-    name: Build Worker Base Images
+    name: Build Worker Base Image
     runs-on: runtime-builder
-    timeout-minutes: 30
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-        - name: builder
-          dockerfile: infra/docker/worker-base-builder.Dockerfile
-          image_name: worker-base-builder
-          cache_name: worker-base-builder-cache
-        - name: runtime
-          dockerfile: infra/docker/worker-base-runtime.Dockerfile
-          image_name: worker-base-runtime
-          cache_name: worker-base-runtime-cache
+    timeout-minutes: 45
     steps:
     - name: Checkout code
       shell: sh
       env:
         GITHUB_TOKEN: ${{ github.token }}
       run: |
-        curl -sH "Authorization: token $GITHUB_TOKEN"           "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/raw/scripts/ci/step_checkout.sh?ref=${GITHUB_SHA}"           | bash
+        curl -sH "Authorization: token $GITHUB_TOKEN" \
+          "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/raw/scripts/ci/step_checkout.sh?ref=${GITHUB_SHA}" \
+          | bash
 
     - name: Docker login to Registry
       shell: sh
@@ -48,7 +38,8 @@ jobs:
         set -eu
         for i in 1 2 3; do
           echo "=== Docker login 尝试 $i/3 ==="
-          if printf '%s' "${ACR_PASSWORD}" | docker login xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com -u "${ACR_USERNAME}" --password-stdin              && docker login git.xiaoxiajianji.com -u "${GITEA_REGISTRY_USER}" -p "${GITEA_REGISTRY_TOKEN}"; then
+          if printf '%s' "${ACR_PASSWORD}" | docker login xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com -u "${ACR_USERNAME}" --password-stdin \
+              && docker login git.xiaoxiajianji.com -u "${GITEA_REGISTRY_USER}" -p "${GITEA_REGISTRY_TOKEN}"; then
             echo "✅ Docker login successful"
             break
           fi
@@ -56,48 +47,40 @@ jobs:
           sleep 5
         done
 
-    - name: Setup buildx builder
+    - name: Build and push Worker base image
       shell: sh
       run: |
         set -eu
-        BUILDER_NAME="ci-builder-${GITHUB_RUN_ID}-${{ matrix.name }}"
-        if ! docker buildx inspect "$BUILDER_NAME" > /dev/null 2>&1; then
-          docker buildx create --use --name "$BUILDER_NAME" --driver docker-container
-          echo "Created $BUILDER_NAME"
-        else
-          docker buildx use "$BUILDER_NAME"
-          echo "Using existing $BUILDER_NAME"
-        fi
-        docker buildx inspect --bootstrap
+        ACR_IMAGE="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji/saas-worker-base:latest"
+        GITEA_IMAGE="git.xiaoxiajianji.com/xiaoxia-saas/saas-worker-base:latest"
+
+        echo "=== Building Worker base image ==="
+
+        # 使用普通 docker build（单平台不需要 buildx）
+        docker build \
+          -f infra/docker/worker-base.Dockerfile \
+          -t "${ACR_IMAGE}" \
+          .
 
-    - name: Build and push base image
-      shell: sh
-      run: |
-        set -eu
-        REGISTRY="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji"
-        IMAGE_TAG="${REGISTRY}/${{ matrix.image_name }}:latest"
-        SAFE_REF_NAME=$(echo "${GITHUB_REF_NAME}" | tr '/' '-')
-        CACHE_REF="${REGISTRY}/${{ matrix.cache_name }}:${SAFE_REF_NAME}"
-        
-        echo "=== Building ${{ matrix.name }} base image ==="
-        echo "Image: ${IMAGE_TAG}"
-        echo "Cache: ${CACHE_REF}"
-        
-        # 用通用构建脚本
-        bash scripts/ci/docker_build_push.sh           ${{ matrix.dockerfile }}           "${IMAGE_TAG}"           "${CACHE_REF}"
-        
-        # 同时推送到 Gitea Packages 作为备份（可选）
-        GITEA_IMAGE="git.xiaoxiajianji.com/xiaoxia-saas/${{ matrix.image_name }}:latest"
-        docker tag "${IMAGE_TAG}" "${GITEA_IMAGE}"
-        docker push "${GITEA_IMAGE}" || echo "Gitea Packages push failed (non-fatal)"
-        
         echo ""
-        echo "✅ ${{ matrix.name }} base image built and pushed"
+        echo "✅ Image built successfully"
 
-    - name: Cleanup buildx builder
+        # 推送到 ACR
+        echo "=== Pushing to ACR ==="
+        docker push "${ACR_IMAGE}"
+        echo "✅ Pushed to ACR"
+
+        # 打标签并推送到 Gitea Packages 作为备份
+        echo "=== Pushing to Gitea Packages ==="
+        docker tag "${ACR_IMAGE}" "${GITEA_IMAGE}"
+        docker push "${GITEA_IMAGE}" || echo "⚠️ Gitea Packages push failed (non-fatal)"
+        echo "✅ Gitea backup push completed"
+
+    - name: Cleanup
       if: always()
       shell: sh
       run: |
-        docker buildx rm "ci-builder-${GITHUB_RUN_ID}-${{ matrix.name }}" 2>/dev/null || true
-        docker buildx prune -f 2>/dev/null || true
-        echo "Builder cleanup done"
+        ACR_IMAGE="xiaoxia-registry.cn-hangzhou.cr.aliyuncs.com/xiaoxiakeji/saas-worker-base:latest"
+        docker rmi "${ACR_IMAGE}" 2>/dev/null || true
+        docker image prune -f 2>/dev/null || true
+        echo "Cleanup done"

alembic/versions/055_cover_templates.py

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

alembic/versions/056_fix_cover_templates_config.py

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

apps/api/app/api/router.py

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

apps/api/app/api/routes/assets.py

@@ -1,5 +1,5 @@
 import logging
-from typing import Any, Optional
+from typing import Any, List, Optional
 
 from app.api.routes._helpers import check_project_access, format_utc_datetime
 from app.auth import AuthenticatedUser, get_current_user
@@ -14,6 +14,7 @@ from app.schemas.asset import (
     AssetResponse,
     BatchClassifyRequest,
     BatchDeleteRequest,
+    BatchGetRequest,
     BatchMarkRequest,
     BatchOperationResponse,
     BatchTagRequest,
@@ -370,6 +371,18 @@ def update_asset_review_status(
     return _to_asset_response(updated)
 
 
+@router.post("/batch", response_model=List[AssetResponse])
+def batch_get_assets(
+    request: BatchGetRequest,
+    authenticated_user: AuthenticatedUser = Depends(get_current_user),
+    asset_repository: Any = Depends(get_asset_repository),
+) -> list[AssetResponse]:
+    """批量获取素材详情（根据 ID 列表）。"""
+    items = asset_repository.find_by_ids(request.ids)
+    storage_service = get_storage_service()
+    return [_to_asset_response(item, storage_service) for item in items]
+
+
 @router.post("/batch-delete", response_model=BatchOperationResponse)
 def batch_delete_assets(
     request: BatchDeleteRequest,

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

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

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

@@ -0,0 +1,364 @@
+"""封面生成路由 — Generation 模块.
+
+端点：
+- POST /generate-cover     AI 生成封面（从预览视频中抽帧）
+
+挂载路径: /api/v1/generation/generate-cover
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import Any, List, Optional
+
+from app.auth import AuthenticatedUser, get_current_user
+from app.dependencies import get_db_session, get_generated_video_repository
+from app.services.edit_plan_service import EditPlanService
+from app.services.edit_template_service import EditTemplateService
+from fastapi import APIRouter, Depends, HTTPException, Query
+from pydantic import BaseModel, Field
+from sqlalchemy.orm import Session
+
+from packages.adapters.sqlalchemy_impl.generation_task_repository import (
+    SQLAlchemyGenerationTaskRepository,
+)
+from packages.application import ListGeneratedVideosByTaskUseCase
+from packages.domain.config_schemas import normalize_plan_config
+
+from .templates_editor.dependencies import get_draft_plan_id, get_editor_services
+
+logger = logging.getLogger(__name__)
+router = APIRouter(tags=["Generation"])
+
+
+
+
+# ── Schemas ──────────────────────────────────────────────────────────────
+
+
+class GenerateCoverRequest(BaseModel):
+    """AI 封面生成请求体"""
+
+    asset_ids: List[str] = Field(default_factory=list, description="素材 ID 列表（确定视频来源）")
+    cover_type: str = Field(
+        default="ai_frame",
+        description="封面类型: ai_frame / manual / upload / ai_regenerate",
+    )
+    frame_time: Optional[float] = Field(
+        default=None,
+        ge=0.0,
+        description="手动选帧时间点（秒），仅 cover_type=manual 时有效",
+    )
+    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):
+    """AI 封面生成响应体"""
+
+    plan_id: str = Field(..., description="剪辑计划 ID")
+    cover: dict[str, Any] = Field(..., description="封面数据（type / image_url / frame_time 等）")
+
+
+# ── Route ────────────────────────────────────────────────────────────────
+
+
+@router.post("/generate-cover", response_model=GenerateCoverResponse)
+def generate_cover(
+    body: GenerateCoverRequest,
+    template_id: str = Query(..., description="模板 ID"),
+    plan_id: str = Depends(get_draft_plan_id),
+    services: tuple[EditTemplateService, EditPlanService] = Depends(get_editor_services),
+    db: Session = Depends(get_db_session),
+    current_user: AuthenticatedUser = Depends(get_current_user),
+) -> GenerateCoverResponse:
+    """AI 生成封面 — 从预览视频中抽帧.
+
+    流程（串行）：
+    1. 预览视频已渲染完成（通过 3 步查找获取 URL）
+    2. 用裸 URL 让 MediaKit 下载视频并抽帧
+    3. 帧图下载后上传到 OSS covers/ 路径
+    """
+    _, plan_svc = services
+    plan = plan_svc.get_plan_or_raise(plan_id)
+
+    # ── 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)
+    rendered_storage_key = (plan.config or {}).get("rendered_storage_key", "")
+
+    # 第二步：如果还没有，通过 generation_task_id 查找预览任务的产物
+    if not rendered_storage_key:
+        generation_task_id = (plan.config or {}).get("generation_task_id", "")
+        logger.info(
+            "[封面生成] 步骤2: 通过 generation_task_id 查找: plan_id=%s task_id=%s", plan_id, generation_task_id
+        )
+        if generation_task_id:
+            try:
+                gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+                task = gen_task_repo.get(generation_task_id)
+                if task:
+                    video_repo = get_generated_video_repository(db)
+                    use_case = ListGeneratedVideosByTaskUseCase(video_repo)
+                    videos = use_case.execute(task.id)
+                    if videos:
+                        rendered_storage_key = getattr(videos[0], "file_url", "") or ""
+                        logger.info(
+                            "[封面生成] ✅ 步骤2找到视频: plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            generation_task_id,
+                            rendered_storage_key[:80],
+                        )
+            except Exception:
+                logger.warning(
+                    "封面生成: 通过 generation_task_id 查找视频失败: plan_id=%s",
+                    plan_id,
+                    exc_info=True,
+                )
+
+    # 第 2.5 步：通过 plan_id 作为 source_edit_plan_id 查找关联的已完成预览任务
+    if not rendered_storage_key:
+        try:
+            gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+            logger.info("[封面生成] 步骤2.5: 通过 source_edit_plan_id 查找: plan_id=%s", plan_id)
+            preview_tasks = gen_task_repo.list_by_source_edit_plan(plan_id)
+            for pt in preview_tasks:
+                if getattr(pt, "status", "") == "completed" and getattr(pt, "is_preview", False):
+                    video_repo = get_generated_video_repository(db)
+                    use_case = ListGeneratedVideosByTaskUseCase(video_repo)
+                    videos = use_case.execute(pt.id)
+                    if videos:
+                        rendered_storage_key = getattr(videos[0], "file_url", "") or ""
+                        logger.info(
+                            "[封面生成] ✅ 步骤2.5找到视频: plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            pt.id,
+                            rendered_storage_key[:80],
+                        )
+                        break
+        except Exception:
+            logger.warning(
+                "封面生成: 通过 source_edit_plan_id 查找预览任务失败: plan_id=%s",
+                plan_id,
+                exc_info=True,
+            )
+
+    # 第三步：按 user + template 查找最近的已完成预览任务（兜底）
+    if not rendered_storage_key:
+        try:
+            gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+            logger.info("[封面生成] 步骤3: 通过 user+template 查找: plan_id=%s template_id=%s", plan_id, template_id)
+            preview_tasks = gen_task_repo.list_latest_completed_preview(
+                user_id=str(current_user.user.id),
+                template_id=template_id,
+            )
+            if preview_tasks:
+                completed_preview = preview_tasks[0]
+                video_repo = get_generated_video_repository(db)
+                use_case = ListGeneratedVideosByTaskUseCase(video_repo)
+                videos = use_case.execute(completed_preview.id)
+                if videos:
+                    rendered_storage_key = getattr(videos[0], "file_url", "") or ""
+                    logger.info(
+                        "封面视频: 通过 user+template 找到预览任务: plan_id=%s template_id=%s task_id=%s",
+                        plan_id,
+                        template_id,
+                        completed_preview.id,
+                    )
+        except Exception:
+            logger.warning(
+                "封面警告: user+template 查找预览任务失败: plan_id=%s template_id=%s",
+                plan_id,
+                template_id,
+                exc_info=True,
+            )
+
+    # 仍然找不到才报 400
+    if not rendered_storage_key:
+        logger.error("[封面生成] ❌ 找不到预览视频: plan_id=%s", plan_id)
+        raise HTTPException(
+            status_code=400,
+            detail="请先生成预览视频，再生成封面",
+        )
+
+    # 回写到 plan.config
+    plan_svc.update_plan_config(plan_id, {"rendered_storage_key": rendered_storage_key})
+
+    # 使用裸 URL（rendered/* 已配置公开读）
+    primary_video_url = None
+    try:
+        if rendered_storage_key.startswith("http"):
+            primary_video_url = rendered_storage_key
+        else:
+            from packages.shared.storage import get_shared_storage_service
+
+            storage_svc = get_shared_storage_service()
+            primary_video_url = storage_svc.get_url(rendered_storage_key)
+        # 防御性规范化：合并路径中的双斜杠（// -> /），但保留协议头的 ://
+        # 历史数据中 project_id 为空时会产生 projects//tasks/ 路径，
+        # MediaKit 的 HTTP 客户端会规范化 URL 导致 404
+        if primary_video_url:
+            import re as _re
+
+            primary_video_url = _re.sub(r"(?<!:)//", "/", primary_video_url)
+        logger.info(
+            "获取预览视频URL用于封面生成: plan_id=%s url=%s",
+            plan_id,
+            primary_video_url[:80] if primary_video_url else "",
+        )
+    except Exception as e:
+        raise HTTPException(
+            status_code=500,
+            detail=f"获取预览视频URL失败: {e}",
+        ) from e
+
+    # 统一封面管道：优先从 GenerationTask.cover_url 读取渲染后视频抽帧的封面
+    # 多步查找 cover_url，和查找视频 URL 一样的 fallback 逻辑
+    if body.cover_type in ("ai_frame", "ai_regenerate"):
+        cover_url_from_task = None
+        gen_task_repo = SQLAlchemyGenerationTaskRepository(db)
+
+        # 步骤 A：通过 generation_task_id 直接查找
+        generation_task_id = (plan.config or {}).get("generation_task_id", "")
+        if generation_task_id:
+            try:
+                task = gen_task_repo.get(generation_task_id)
+                if task and getattr(task, "cover_url", ""):
+                    cover_url_from_task = task.cover_url
+                    logger.info(
+                        "[封面生成] 统一管道封面(步骤A-direct): plan_id=%s task_id=%s url=%s",
+                        plan_id,
+                        generation_task_id,
+                        cover_url_from_task[:80],
+                    )
+            except Exception:
+                logger.warning(
+                    "[封面生成] 步骤A读取 cover_url 失败: plan_id=%s task_id=%s",
+                    plan_id,
+                    generation_task_id,
+                    exc_info=True,
+                )
+
+        # 步骤 B：通过 source_edit_plan_id 查找关联预览任务的 cover_url
+        if not cover_url_from_task:
+            try:
+                preview_tasks = gen_task_repo.list_by_source_edit_plan(plan_id)
+                for pt in preview_tasks:
+                    if getattr(pt, "status", "") == "completed" and getattr(pt, "cover_url", ""):
+                        cover_url_from_task = pt.cover_url
+                        logger.info(
+                            "[封面生成] 统一管道封面(步骤B-source_plan): plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            pt.id,
+                            cover_url_from_task[:80],
+                        )
+                        break
+            except Exception:
+                logger.warning(
+                    "[封面生成] 步骤B查找 cover_url 失败: plan_id=%s",
+                    plan_id,
+                    exc_info=True,
+                )
+
+        # 步骤 C：通过 user+template 查找最近的已完成预览任务的 cover_url
+        if not cover_url_from_task:
+            try:
+                preview_tasks = gen_task_repo.list_latest_completed_preview(
+                    user_id=str(current_user.user.id),
+                    template_id=template_id,
+                )
+                for pt in preview_tasks:
+                    if getattr(pt, "cover_url", ""):
+                        cover_url_from_task = pt.cover_url
+                        logger.info(
+                            "[封面生成] 统一管道封面(步骤C-user+template): plan_id=%s task_id=%s url=%s",
+                            plan_id,
+                            pt.id,
+                            cover_url_from_task[:80],
+                        )
+                        break
+            except Exception:
+                logger.warning(
+                    "[封面生成] 步骤C查找 cover_url 失败: plan_id=%s template_id=%s",
+                    plan_id,
+                    template_id,
+                    exc_info=True,
+                )
+
+        if cover_url_from_task:
+            # 标题已在预览视频渲染时烧录（ASS字幕），封面帧自然包含标题
+            cover_data = {
+                "type": "ai_frame",
+                "image_url": cover_url_from_task,
+                "frame_time": 0.0,
+                "confidence": 0.95,
+            }
+            current_config = dict(plan.config) if plan.config else {}
+            current_config["cover"] = cover_data
+            normalized = normalize_plan_config(current_config)
+            plan_svc.update_plan_config(plan_id, {"cover": normalized["cover"]})
+            return GenerateCoverResponse(plan_id=plan_id, cover=cover_data)
+
+        logger.warning(
+            "[封面生成] 统一管道未找到 cover_url: plan_id=%s",
+            plan_id,
+        )
+        # ai_frame/ai_regenerate 类型必须从渲染管道获取，不再回退到 AI 服务
+        raise HTTPException(
+            status_code=400,
+            detail="封面尚未生成，请先重新生成预览视频以触发封面自动提取",
+        )
+
+    from packages.shared.ai_service import run_generate_cover
+
+    try:
+        logger.info("[封面生成] 开始调用 AI 封面生成服务: plan_id=%s", plan_id)
+        cover_data = run_generate_cover(
+            plan_id=plan_id,
+            asset_ids=body.asset_ids,
+            cover_type=body.cover_type,
+            frame_time=body.frame_time,
+            primary_video_url=primary_video_url,
+        )
+    except RuntimeError as e:
+        raise HTTPException(status_code=500, detail=str(e)) from e
+
+    current_config = dict(plan.config) if plan.config else {}
+    current_config["cover"] = cover_data
+    normalized = normalize_plan_config(current_config)
+    plan_svc.update_plan_config(plan_id, {"cover": normalized["cover"]})
+
+    logger.info(
+        "封面生成完成: template_id=%s plan_id=%s type=%s by user=%s",
+        template_id,
+        plan_id,
+        body.cover_type,
+        current_user.user.id,
+    )
+
+    return GenerateCoverResponse(plan_id=plan_id, cover=cover_data)

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

@@ -5,6 +5,7 @@
 
 from __future__ import annotations
 
+import json
 import logging
 
 from app.auth import AuthenticatedUser, get_current_user
@@ -267,6 +268,20 @@ def create_preview_generation_task(
     # 从模板读取 editing_mode / mode 作为 strategy_id（渲染 pipeline 的 mode 参数）
     strategy_id = _resolve_strategy_id_from_template(request.template_id, db, user_id)
 
+    # 处理标题配置：如果有标题文本，序列化到 custom_title 字段传递给 worker
+    title_config = request.title_config or {}
+    title_text = (title_config.get("text") or "").strip()
+    custom_title_value = ""
+    if title_text:
+        # 将标题文本和样式配置序列化为 JSON 存入 custom_title
+        # Worker 端会解析 JSON 获取完整标题配置
+        custom_title_value = json.dumps(title_config, ensure_ascii=False)
+        logger.info(
+            "[预览生成] 标题配置: text=%s, config_keys=%s",
+            title_text[:30],
+            list(title_config.keys()),
+        )
+
     use_case = CreateGenerationTaskUseCase(generation_task_repository)
 
     try:
@@ -290,6 +305,7 @@ def create_preview_generation_task(
                 auto_retry_enabled=False,
                 auto_retry_max=0,
                 is_preview=True,
+                custom_title=custom_title_value,
             )
         )
     except ValueError as e:
@@ -299,6 +315,32 @@ def create_preview_generation_task(
         logger.error("[预览生成] 创建失败: %s", e, exc_info=True)
         raise HTTPException(status_code=500, detail="创建预览生成任务失败，请稍后再试") from e
 
+    # 关联编辑计划：如果前端未传 source_edit_plan_id，通过 template_id + user_id 查找
+    if not task.source_edit_plan_id and request.template_id:
+        try:
+            from packages.adapters.sqlalchemy_impl.edit_plan_repository import (
+                SQLAlchemyEditPlanRepository,
+            )
+
+            _plan_repo = SQLAlchemyEditPlanRepository(db)
+            _plans = _plan_repo.list_by_template(request.template_id, limit=20)
+            for _p in _plans:
+                if (_p.created_by_user_id or "") == user_id:
+                    task.source_edit_plan_id = _p.id
+                    generation_task_repository.update(task)
+                    logger.info(
+                        "[预览生成] 自动关联编辑计划: task_id=%s plan_id=%s",
+                        task.id,
+                        _p.id,
+                    )
+                    break
+        except Exception:
+            logger.warning(
+                "[预览生成] 查找关联编辑计划失败（不影响主流程）: task_id=%s",
+                task.id,
+                exc_info=True,
+            )
+
     # 入队执行；若入队失败则标记任务为 failed 避免僵尸数据
     try:
         if not safe_enqueue_generation_task(

apps/api/app/api/routes/health.py

@@ -1,6 +1,6 @@
 from datetime import datetime, timezone
 
-import psycopg2
+import psycopg
 import redis
 from app.config import settings
 from fastapi import APIRouter, status
@@ -49,7 +49,7 @@ async def _check_database() -> dict:
             "message": "Using in-memory database",
         }
     try:
-        conn = psycopg2.connect(settings.DATABASE_URL, connect_timeout=3)
+        conn = psycopg.connect(settings.DATABASE_URL, connect_timeout=3)
         with conn.cursor() as cur:
             cur.execute("SELECT 1")
             cur.fetchone()
@@ -124,7 +124,7 @@ async def _check_migrations() -> dict:
             "message": "Using in-memory database, no migrations needed",
         }
     try:
-        conn = psycopg2.connect(settings.DATABASE_URL, connect_timeout=3)
+        conn = psycopg.connect(settings.DATABASE_URL, connect_timeout=3)
         with conn.cursor() as cur:
             cur.execute("""
                 SELECT COUNT(*) FROM information_schema.tables

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

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

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

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

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

@@ -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,
             ),
         )
 
@@ -223,7 +274,12 @@ def _get_task_output_url(task, gen_task_repo, db) -> str:
         use_case = ListGeneratedVideosByTaskUseCase(video_repo)
         videos = use_case.execute(task.id)
         if videos:
-            return getattr(videos[0], "file_url", "") or ""
+            url = getattr(videos[0], "file_url", "") or ""
+            # 规范化：合并路径中的双斜杠（保留协议头 ://）
+            if url:
+                import re as _re
+                url = _re.sub(r"(?<!:)//", "/", url)
+            return url
     except Exception:
         pass
     return ""

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

@@ -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"""
 
@@ -99,29 +107,6 @@ class AIRecommendResponse(BaseModel):
     confidence: float = Field(..., ge=0.0, le=1.0, description="AI 推荐置信度 (0~1)")
 
 
-# ── 封面生成 ────────────────────────────────────────────────────────────────
-
-
-class GenerateCoverRequest(BaseModel):
-    """AI 封面生成请求体"""
-
-    asset_ids: List[str] = Field(default_factory=list, description="素材 ID 列表（确定视频来源）")
-    cover_type: str = Field(
-        default="ai_frame",
-        description="封面类型: ai_frame / manual / upload / ai_regenerate",
-    )
-    frame_time: Optional[float] = Field(
-        default=None,
-        ge=0.0,
-        description="手动选帧时间点（秒），仅 cover_type=manual 时有效",
-    )
-
-
-class GenerateCoverResponse(BaseModel):
-    """AI 封面生成响应体"""
-
-    plan_id: str = Field(..., description="剪辑计划 ID")
-    cover: dict[str, Any] = Field(..., description="封面数据（type / image_url / frame_time 等）")
 
 
 # ── BGM ────────────────────────────────────────────────────────────────────
@@ -250,6 +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")
 
@@ -462,17 +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/api/app/schemas/asset.py

@@ -58,6 +58,12 @@ class AssetResponse(BaseModel):
 MAX_BATCH_SIZE = 200
 
 
+class BatchGetRequest(BaseModel):
+    """批量获取素材详情请求。"""
+
+    ids: list[str] = Field(..., min_length=1, max_length=MAX_BATCH_SIZE, description="素材 ID 列表")
+
+
 class BatchDeleteRequest(BaseModel):
     """批量删除请求（软删除）。"""
 

apps/api/app/schemas/generation_task.py

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

apps/api/app/services/cover_service.py

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

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

@@ -200,15 +200,7 @@ test.describe("Core generation flow", () => {
     await expect(page.getByRole("heading", { name: /选择配音/ })).toBeVisible({ timeout: 15000 })
     await page.getByRole("button", { name: "下一步" }).click()
 
-    // Step 4: preview — 需要先生成预览视频，才能进入下一步
-    await expect(page.getByRole("heading", { name: /生成预览/ })).toBeVisible({ timeout: 15000 })
-    // 点击"生成预览"按钮触发预览生成
-    await page.locator(".xx-preview-generate-btn").click()
-    // 等待预览生成完成（后端渲染，可能需要较长时间）
-    await expect(page.getByText("预览生成成功")).toBeVisible({ timeout: 300_000 })
-    await page.getByRole("button", { name: "下一步" }).click()
-
-    // Step 5: title
+    // Step 4: title（新顺序：标题在预览之前）
     await expect(page.getByRole("heading", { name: /选择标题/ })).toBeVisible({ timeout: 15000 })
     // 等待组件完全渲染
     await page.waitForTimeout(2000)
@@ -222,6 +214,10 @@ test.describe("Core generation flow", () => {
     await titleInput.fill(titleText)
     await page.getByRole("button", { name: "下一步" }).click()
 
+    // Step 5: preview — 前端实时预览架构改造，无需后端生成预览
+    await expect(page.getByRole("heading", { name: /预览设置/ })).toBeVisible({ timeout: 15000 })
+    await page.getByRole("button", { name: "下一步" }).click()
+
     // Step 6: cover (默认 AI 智能选帧模式，直接下一步)
     await expect(page.getByRole("heading", { name: /选择封面/ })).toBeVisible({ timeout: 15000 })
     await page.getByRole("button", { name: "下一步" }).click()
@@ -258,9 +254,12 @@ test.describe("Core generation flow", () => {
     // Generate API may return 400 in test env if template has no ready segments
     // That is OK for a wizard flow smoke test
     if (genResp.ok()) {
-      const genData = (await genResp.json()) as { plan_id: string; generation_task_id: string }
-      expect(genData.plan_id).toBeTruthy()
-      expect(genData.generation_task_id).toBeTruthy()
+      const genData = (await genResp.json()) as {
+        items: Array<{ id: string; status: string }>
+        total: number
+      }
+      expect(genData.items.length).toBeGreaterThan(0)
+      expect(genData.items[0].id).toBeTruthy()
     } else {
       console.log(`[E2E] Generate API returned ${genResp.status()}, wizard flow test still passes`)
     }

apps/web/package-lock.json

@@ -12,6 +12,7 @@
         "@tanstack/react-query": "^5.45.0",
         "antd": "^5.18.0",
         "axios": "^1.7.2",
+        "mp4box": "^2.4.1",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
         "react-router-dom": "^6.24.0",
@@ -4623,6 +4624,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/mp4box": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmmirror.com/mp4box/-/mp4box-2.4.1.tgz",
+      "integrity": "sha512-0HGX7nXoDIX6FKLVl4a3wtYjBlwqsN3xuQC3GXzNtKp98FXUOhDSq623azsz8DG5ptd9ZXcXodDkgbdMZOjWvw==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=20.8.1"
+      }
+    },
     "node_modules/mrmime": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/mrmime/-/mrmime-2.0.1.tgz",

apps/web/package.json

@@ -23,6 +23,7 @@
     "@tanstack/react-query": "^5.45.0",
     "antd": "^5.18.0",
     "axios": "^1.7.2",
+    "mp4box": "^2.4.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^6.24.0",

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

@@ -0,0 +1,109 @@
+/**
+ * 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
+
+/** 正在执行刷新操作的 Promise，防止主动刷新和 401 被动刷新并发竞争 */
+let activeRefreshPromise: Promise<void> | 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
+  }
+}
+
+/**
+ * 执行 token 刷新（带并发锁，供主动刷新和被动 401 共用）
+ * 返回当前刷新操作的 Promise；若已有刷新进行中则复用该 Promise。
+ */
+export function executeTokenRefresh(): Promise<void> | null {
+  // 已有刷新进行中 → 复用
+  if (activeRefreshPromise) {
+    return activeRefreshPromise
+  }
+
+  const { user, refreshToken: refreshTokenValue } = useAuthStore.getState()
+
+  // 安全检查：user 或 refreshToken 为空时跳过刷新
+  if (!user || !refreshTokenValue) {
+    return null
+  }
+
+  activeRefreshPromise = (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(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"
+    } finally {
+      activeRefreshPromise = null
+    }
+  })()
+
+  return activeRefreshPromise
+}
+
+/**
+ * 调度主动刷新：在 token 过期前 REFRESH_BUFFER_SECONDS 秒自动刷新
+ */
+export function scheduleProactiveRefresh(): void {
+  cancelProactiveRefresh()
+
+  // 统一从 Zustand store 读取（与 setAuth 写入保持一致）
+  const { accessToken, refreshToken: refreshTokenValue } = useAuthStore.getState()
+
+  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(() => {
+    executeTokenRefresh()
+  }, delaySeconds * 1000)
+}

apps/web/src/api/client.ts

@@ -5,7 +5,8 @@
 import axios, { AxiosError, InternalAxiosRequestConfig } from "axios"
 import { message } from "antd"
 import { useAuthStore } from "@/store/authStore"
-import { refreshAccessToken } from "./auth"
+
+import { cancelProactiveRefresh, executeTokenRefresh } from "./auth/tokenRefresh"
 
 // 创建 Axios 实例
 const apiClient = axios.create({
@@ -97,14 +98,22 @@ apiClient.interceptors.response.use(
       isRefreshing = true
 
       try {
-        const data = await refreshAccessToken(refreshToken)
-        const newAccessToken = data.access_token
-        const newRefreshToken = data.refresh_token ?? refreshToken
+        // 使用共享的刷新函数（带并发锁 + 安全检查）
+        const refreshPromise = executeTokenRefresh()
+        if (!refreshPromise) {
+          // user 或 refreshToken 为空，无法刷新
+          cancelProactiveRefresh()
+          useAuthStore.getState().clearAuth()
+          window.location.href = "/"
+          return Promise.reject(new Error("Unable to refresh: missing user or refresh token"))
+        }
+        await refreshPromise
 
-        // 更新 Zustand + localStorage
-        useAuthStore
-          .getState()
-          .setAuth(useAuthStore.getState().user!, newAccessToken, newRefreshToken)
+        // 获取刷新后的新 token
+        const newAccessToken = useAuthStore.getState().accessToken
+        if (!newAccessToken) {
+          return Promise.reject(new Error("Token refresh failed: no new access token"))
+        }
 
         // 处理排队的请求
         processQueue(null, newAccessToken)
@@ -116,6 +125,7 @@ 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/api/cover-templates.ts

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

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

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

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

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

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

@@ -0,0 +1,31 @@
+import apiClient from "../client"
+
+export interface GenerateCoverRequest {
+  asset_ids: string[]
+  cover_type?: "ai_frame" | "manual" | "upload" | "ai_regenerate"
+  frame_time?: number
+}
+
+export interface GenerateCoverResponse {
+  plan_id: string
+  cover: {
+    scheme?: string
+    asset_id?: string
+    frame_time?: number
+    image_url?: string
+    thumbnail_url?: string
+    [key: string]: unknown
+  }
+}
+
+/** AI 生成封面 — 从预览视频中抽帧 */
+export async function generateCover(
+  templateId: string,
+  data: GenerateCoverRequest,
+): Promise<GenerateCoverResponse> {
+  const response = await apiClient.post<GenerateCoverResponse>("/generation/generate-cover", data, {
+    timeout: 300000,
+    params: { template_id: templateId },
+  })
+  return response.data
+}

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

@@ -3,10 +3,9 @@ export type {
   CreatePreviewRequest,
   CreatePreviewResponse,
   PreviewTaskResponse,
-  ConfirmGenerationRequest,
-  ConfirmGenerationResponse,
-  ConfirmGenerationTaskItem,
 } from "./types"
 
 export { createPreview, getPreviewStatus } from "./preview"
-export { confirmGeneration } from "./confirm"
+
+export { generateCover } from "./cover"
+export type { GenerateCoverRequest, GenerateCoverResponse } from "./cover"

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

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

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

@@ -57,8 +57,31 @@ export interface TaskListResponse {
 export interface CreateGenerationTaskRequest {
   template_id: string
   asset_ids: string[]
-  title_ids: string[]
-  voice_ids: string[]
+  title_ids?: string[]
+  voice_ids?: string[]
+  /** 输出视频宽度 */
+  output_width?: number
+  /** 输出视频高度 */
+  output_height?: number
+  /** 自定义封面图片 URL */
+  cover_url?: string
+  /** 自定义视频标题 */
+  custom_title?: string
+  /** 视频时长（秒） */
+  duration?: number
+  /** 视频宽高比，如 "9:16" */
+  video_ratio?: string
+  /** 标题烧录配置 */
+  title_config?: {
+    text?: string
+    font?: string
+    font_size?: number
+    font_color?: string
+    position?: string
+    bold?: boolean
+    stroke?: boolean
+    shadow?: boolean
+  }
 }
 
 /** 创建生成任务响应（对齐后端 GenerationTaskResponse） */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

@@ -1,21 +1,27 @@
 /**
- * 智能剪辑页面 — V22 多预览 + 配音前置
- * 7 步向导：选择模板 → 选择素材 → 选择配音 → 生成预览 → 选择标题 → 选择封面 → 确认生成
+ * 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"
+import { useQuery } from "@tanstack/react-query"
 import { useCloneProgress } from "@/hooks/useCloneProgress"
+import { getAssetsByKind } from "@/api/assets"
 import CloneModal from "@/components/voice/CloneModal"
 import GenerateHeader from "./components/GenerateHeader"
+import {
+  calculateTotalVideoDuration,
+  estimateTotalVideoDuration,
+} from "./utils/calculateTotalVideoDuration"
 import GenerateStepsBar from "./components/GenerateStepsBar"
 import GenerateResultPanel from "./components/GenerateResultPanel"
 import PreviewVideoPanel from "./components/PreviewVideoPanel"
@@ -24,7 +30,8 @@ import GenerateStepActions from "./components/GenerateStepActions"
 import { useGenerateFormState } from "./hooks/useGenerateFormState"
 import { useStepNavigation } from "./hooks/useStepNavigation"
 import { useGenerateVideo } from "./hooks/useGenerateVideo"
-import { useStep4Preview } from "./hooks/useStep4Preview"
+import { usePreviewAssets } from "./hooks/usePreviewAssets"
+import { useTitleStyleUpdaters } from "./hooks/useStep4Title/useTitleStyleUpdaters"
 import "./generate.css"
 
 const GeneratePage: React.FC = () => {
@@ -71,6 +78,12 @@ 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 +93,44 @@ 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])
+  /* ── 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],
+  )
 
-  /* ── Step4 预览生成（多预览 + voice_ids） ── */
-  const step4Preview = useStep4Preview({
-    templates: userTemplates,
-    selectedTemplate,
-    materialMode,
-    selectedMaterials,
-    smartSelectedIds,
-    duration,
-    videoRatio,
-    voiceIds: previewVoiceIds,
-    voiceLibraryId: selectedVoice || undefined,
-    previewCount,
+  /* ── 视频总时长计算（用于配音时长校验） ── */
+  const totalVideoDuration = useMemo(() => {
+    // 优先用素材精确时长；素材未加载时用模板 segments 的 duration_max 之和估算
+    const exact = calculateTotalVideoDuration(previewAssets, currentTemplate ?? undefined)
+    if (exact > 0) return exact
+    return estimateTotalVideoDuration(currentTemplate ?? undefined)
+  }, [previewAssets, currentTemplate])
+
+  /* ── 配音音频 URL ── */
+  const { data: voiceMaterials = [] } = useQuery({
+    queryKey: ["assets", "voice"],
+    queryFn: () => getAssetsByKind("voice", { limit: 50 }),
   })
 
+  const voiceAudioUrl = useMemo(() => {
+    if (!selectedVoice) return undefined
+    const asset = voiceMaterials.find((v) => v.id === selectedVoice)
+    return asset?.file_url || undefined
+  }, [selectedVoice, voiceMaterials])
+
   /* ── 步骤导航 ── */
   const { goNext, goPrev } = useStepNavigation({
     currentStep,
@@ -119,7 +140,7 @@ const GeneratePage: React.FC = () => {
     selectedMaterials,
     smartSelectedIds,
     titleSettings,
-    previewReady: step4Preview.canProceed,
+    previewReady: previewAssetsReady,
   })
 
   /* ── 视频生成核心逻辑 ── */
@@ -150,7 +171,6 @@ const GeneratePage: React.FC = () => {
     autoSubtitles,
     bgm,
     generateCount,
-    previewTaskId: step4Preview.selectedTaskId,
   })
 
   /* ================================================================
@@ -182,11 +202,23 @@ 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}
             selectedVoice={selectedVoice}
             onSelectedVoiceChange={setSelectedVoice}
+            totalVideoDuration={totalVideoDuration}
             voiceMode={voiceMode}
             onVoiceModeChange={setVoiceMode}
             selectedClonedVoice={selectedClonedVoice}
@@ -206,21 +238,6 @@ const GeneratePage: React.FC = () => {
             onRetry={handleRetryGenerate}
             onDismissError={handleDismissError}
             presetVoices={presetVoices}
-            videoRatio={videoRatio}
-            /* Step4 多预览 */
-            previewCount={previewCount}
-            onPreviewCountChange={setPreviewCount}
-            previewItems={step4Preview.items}
-            previewSelectedIndex={step4Preview.selectedIndex}
-            onSelectPreview={step4Preview.setSelectedIndex}
-            previewOverallStatus={step4Preview.previewStatus}
-            previewOverallError={step4Preview.previewError}
-            previewOverallProgress={step4Preview.progress}
-            previewAnyGenerating={step4Preview.anyGenerating}
-            previewTemplateName={step4Preview.templateName}
-            previewMaterialCount={step4Preview.materialCount}
-            onGeneratePreview={step4Preview.generatePreview}
-            onRegeneratePreview={step4Preview.regeneratePreview}
           />
 
           <GenerateStepActions
@@ -236,22 +253,19 @@ const GeneratePage: React.FC = () => {
 
         {/* ════ 右侧：预览 + 生成结果 ════ */}
         <div className="xx-generate-right-col">
-          {/* 预览视频面板（Step4+ 常驻，展示选中的预览） */}
+          {/* 预览视频面板（Step4+ 显示，含 CSS 标题实时预览层） */}
           {currentStep >= 4 && (
             <PreviewVideoPanel
-              previewStatus={step4Preview.previewStatus}
-              previewResult={step4Preview.previewResult}
-              previewError={step4Preview.previewError}
-              progress={step4Preview.progress}
+              assets={previewAssets}
+              template={currentTemplate}
               videoRatio={videoRatio}
-              onRegenerate={step4Preview.regeneratePreview}
-              titleText={titleSettings.title}
-              titleSettings={currentStep >= 5 ? titleSettings : undefined}
+              assetsReady={previewAssetsReady}
+              assetsLoading={previewAssetsLoading}
+              titleSettings={titleSettings}
+              voiceAudioUrl={voiceAudioUrl}
             />
           )}
-
-          {/* 正式生成结果（Step5+ 才显示） */}
-          {currentStep >= 5 && (
+          {currentStep >= 6 && (
             <GenerateResultPanel
               generated={generated}
               generating={generating}
@@ -272,6 +286,7 @@ const GeneratePage: React.FC = () => {
 
       {/* ── 视频预览弹窗 ── */}
       <Modal
+        className="xx-preview-modal"
         open={previewModalOpen}
         onCancel={() => setPreviewModalOpen(false)}
         footer={null}

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

@@ -0,0 +1,506 @@
+/**
+ * 前端预览播放器 — Canvas + WebCodecs 方案
+ *
+ * 架构：
+ * - 浏览器支持 WebCodecs → Canvas 渲染（帧级精确控制 + 标题合成）
+ * - 浏览器不支持 → fallback 到多 video 元素方案
+ *
+ * 对外 API 不变：assets, template, videoRatio, ready, voiceAudioUrl
+ */
+import React, { useMemo, useCallback, useState, useRef, useEffect } from "react"
+import {
+  PlayCircleOutlined,
+  PauseCircleOutlined,
+  SoundOutlined,
+  LoadingOutlined,
+} from "@ant-design/icons"
+import type { AssetItem } from "@/api/assets"
+import type { EditingTemplate } from "@/api/editing-planner"
+import { useSegmentScheduler, type PlaybackSegment } from "../hooks/useSegmentScheduler"
+import { useCanvasPlayer, isWebCodecsSupported } from "../hooks/useCanvasPlayer"
+
+interface FrontendPreviewPlayerProps {
+  assets: AssetItem[]
+  template: EditingTemplate | null
+  videoRatio: string
+  ready: boolean
+  voiceAudioUrl?: string
+  titleSettings?: {
+    title: string
+    size: number
+    font: string
+    color: string
+    position: "top" | "center" | "bottom"
+    bold?: boolean
+    italic?: boolean
+    stroke?: boolean
+    shadow?: boolean
+  }
+}
+
+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（复用原逻辑）
+ */
+function buildPlaybackSegments(
+  assets: AssetItem[],
+  template: EditingTemplate | null,
+): PlaybackSegment[] {
+  if (!assets.length) return []
+
+  const templateSegments = template?.segments || []
+  const segments: PlaybackSegment[] = []
+
+  assets.forEach((asset, i) => {
+    const assetDuration = asset.duration || asset.metadata?.duration || 30
+    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)
+    const videoUrl = asset.file_url || asset.storage_key
+
+    segments.push({ assetId: asset.id, videoUrl, startTime, endTime, order: i })
+  })
+
+  return segments
+}
+
+const FrontendPreviewPlayer: React.FC<FrontendPreviewPlayerProps> = ({
+  assets,
+  template,
+  videoRatio: _videoRatio,
+  ready,
+  voiceAudioUrl,
+  titleSettings,
+}) => {
+  const segments = useMemo(() => buildPlaybackSegments(assets, template), [assets, template])
+  const useWebCodecs = isWebCodecsSupported()
+
+  // ── 两条路径共用同一个 canvas ref（fallback 路径不使用） ──
+  const canvasRef = useRef<HTMLCanvasElement>(null)
+
+  // ── Canvas 播放器（WebCodecs 路径） ──
+  const canvasTitle = titleSettings
+    ? {
+        text: titleSettings.title || "标题预览",
+        fontSize: titleSettings.size,
+        fontFamily: titleSettings.font || "思源黑体",
+        color: titleSettings.color || "#ffffff",
+        position: titleSettings.position || "bottom",
+        bold: titleSettings.bold,
+        stroke: titleSettings.stroke,
+        shadow: titleSettings.shadow,
+      }
+    : undefined
+
+  const canvasSegments = useMemo(
+    () =>
+      segments.map((s) => ({
+        assetId: s.assetId,
+        videoUrl: s.videoUrl,
+        startTime: s.startTime,
+        endTime: s.endTime,
+      })),
+    [segments],
+  )
+
+  const { state: canvasState, controls: canvasControls } = useCanvasPlayer(
+    canvasRef,
+    canvasSegments,
+    useWebCodecs ? canvasTitle : undefined,
+  )
+
+  // ── Video 播放器（fallback 路径） ──
+  const {
+    isPlaying: videoIsPlaying,
+    currentTime: videoCurrentTime,
+    totalDuration: videoTotalDuration,
+    currentSegmentIndex: videoCurrentSegIdx,
+    canPlay: videoCanPlay,
+    togglePlayPause: videoTogglePlayPause,
+    seekTo: videoSeekTo,
+    videoRefs,
+  } = useSegmentScheduler(segments)
+
+  // 选择哪条路径的状态
+  const isPlaying = useWebCodecs ? canvasState.isPlaying : videoIsPlaying
+  const currentTime = useWebCodecs ? canvasState.currentTime : videoCurrentTime
+  const totalDuration = useWebCodecs ? canvasState.duration : videoTotalDuration
+  const canPlay = useWebCodecs ? canvasState.isReady : videoCanPlay
+  const isBuffering = useWebCodecs ? canvasState.isBuffering : false
+
+  // ── 配音音频同步 ──
+  const audioRef = useRef<HTMLAudioElement | null>(null)
+  const prevIsPlayingRef = useRef(false)
+
+  useEffect(() => {
+    if (!voiceAudioUrl) {
+      if (audioRef.current) {
+        audioRef.current.pause()
+        audioRef.current.src = ""
+        audioRef.current = null
+      }
+      return
+    }
+    if (!audioRef.current) {
+      audioRef.current = new Audio()
+      audioRef.current.preload = "auto"
+    }
+    if (audioRef.current.src !== voiceAudioUrl) {
+      audioRef.current.src = voiceAudioUrl
+    }
+  }, [voiceAudioUrl])
+
+  useEffect(() => {
+    const audio = audioRef.current
+    if (!audio || !audio.src) return
+    if (isPlaying && !prevIsPlayingRef.current) {
+      audio.currentTime = currentTime
+      audio.play().catch(() => {})
+    } else if (!isPlaying && prevIsPlayingRef.current) {
+      audio.pause()
+    }
+    prevIsPlayingRef.current = isPlaying
+  }, [isPlaying, currentTime])
+
+  // 片段切换时同步音频（仅 fallback 路径需要）
+  const segmentSyncKey = useWebCodecs ? -1 : videoCurrentSegIdx
+  useEffect(() => {
+    const audio = audioRef.current
+    if (!audio || !audio.src || !isPlaying) return
+    audio.currentTime = currentTime
+  }, [segmentSyncKey, isPlaying, currentTime])
+
+  const handleSeekTo = useCallback(
+    (time: number) => {
+      if (useWebCodecs) {
+        canvasControls.seek(time)
+      } else {
+        videoSeekTo(time)
+      }
+      const audio = audioRef.current
+      if (audio && audio.src) {
+        audio.currentTime = time
+      }
+    },
+    [useWebCodecs, canvasControls, videoSeekTo],
+  )
+
+  const handleTogglePlay = useCallback(() => {
+    if (useWebCodecs) {
+      if (canvasState.isPlaying) {
+        canvasControls.pause()
+      } else {
+        canvasControls.play()
+      }
+    } else {
+      videoTogglePlayPause()
+    }
+  }, [useWebCodecs, canvasState.isPlaying, canvasControls, videoTogglePlayPause])
+
+  // ── 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))
+      handleSeekTo(ratio * totalDuration)
+    },
+    [totalDuration, handleSeekTo],
+  )
+
+  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))
+      handleSeekTo(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, handleSeekTo])
+
+  const progressPercent = totalDuration > 0 ? (currentTime / totalDuration) * 100 : 0
+
+  // ── Canvas ResizeObserver ──
+  const canvasContainerRef = useRef<HTMLDivElement>(null)
+  useEffect(() => {
+    const container = canvasContainerRef.current
+    const canvas = canvasRef.current
+    if (!container || !canvas) return
+    const ro = new ResizeObserver((entries) => {
+      for (const entry of entries) {
+        const { width, height } = entry.contentRect
+        if (width > 0 && height > 0) {
+          canvas.width = width * window.devicePixelRatio
+          canvas.height = height * window.devicePixelRatio
+        }
+      }
+    })
+    ro.observe(container)
+    return () => ro.disconnect()
+  }, [])
+
+  // ── 未就绪 ──
+  if (!ready || !assets.length) {
+    return (
+      <div
+        className="xx-preview-empty"
+        style={{
+          position: "absolute",
+          inset: 0,
+          display: "flex",
+          flexDirection: "column",
+          alignItems: "center",
+          justifyContent: "center",
+          zIndex: 1,
+        }}
+      >
+        <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"
+        style={{
+          position: "absolute",
+          inset: 0,
+          display: "flex",
+          flexDirection: "column",
+          alignItems: "center",
+          justifyContent: "center",
+          zIndex: 1,
+        }}
+      >
+        {isBuffering ? (
+          <>
+            <LoadingOutlined style={{ fontSize: 48, color: "#fff", marginBottom: 12 }} spin />
+            <p style={{ color: "rgba(255,255,255,0.8)" }}>加载中...</p>
+          </>
+        ) : (
+          <>
+            <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 (
+    <>
+      {/* ── Canvas 渲染层（WebCodecs 路径） ── */}
+      {useWebCodecs && (
+        <div
+          ref={canvasContainerRef}
+          style={{
+            position: "absolute",
+            inset: 0,
+            zIndex: 1,
+            background: "#000",
+          }}
+        >
+          <canvas
+            ref={canvasRef}
+            style={{
+              width: "100%",
+              height: "100%",
+              objectFit: "contain",
+            }}
+          />
+        </div>
+      )}
+
+      {/* ── Video 渲染层（fallback 路径） ── */}
+      {!useWebCodecs &&
+        segments.map((seg, i) => (
+          <video
+            key={seg.assetId}
+            muted
+            ref={(el) => {
+              videoRefs.current[i] = el
+            }}
+            preload={
+              i === videoCurrentSegIdx ? "auto" : i === videoCurrentSegIdx + 1 ? "metadata" : "none"
+            }
+            src={seg.videoUrl}
+            style={{
+              position: "absolute",
+              inset: 0,
+              width: "100%",
+              height: "100%",
+              objectFit: "contain",
+              background: "#000",
+              zIndex: 1,
+              opacity: i === videoCurrentSegIdx ? 1 : 0,
+              pointerEvents: i === videoCurrentSegIdx ? "auto" : "none",
+            }}
+            playsInline
+          />
+        ))}
+
+      {/* 播放按钮 */}
+      {!isPlaying && (
+        <button
+          className="xx-preview-play-btn"
+          onClick={handleTogglePlay}
+          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,
+          }}
+        >
+          <PlayCircleOutlined />
+        </button>
+      )}
+
+      {/* 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,
+        }}
+      >
+        {useWebCodecs ? "Canvas" : `片段 ${videoCurrentSegIdx + 1}/${segments.length}`}
+      </div>
+
+      {/* 控制条 */}
+      <div
+        className="xx-preview-controls"
+        style={{
+          position: "absolute",
+          bottom: 0,
+          left: 0,
+          right: 0,
+          display: "flex",
+          alignItems: "center",
+          gap: 8,
+          padding: "8px 12px",
+          background: "linear-gradient(transparent, rgba(0,0,0,0.6))",
+          zIndex: 10,
+        }}
+      >
+        <button
+          onClick={handleTogglePlay}
+          style={{
+            background: "none",
+            border: "none",
+            color: "#fff",
+            fontSize: 18,
+            cursor: "pointer",
+            padding: 4,
+            display: "flex",
+            alignItems: "center",
+          }}
+        >
+          {isPlaying ? <PauseCircleOutlined /> : <PlayCircleOutlined />}
+        </button>
+
+        <span
+          style={{
+            fontSize: 12,
+            color: "rgba(255,255,255,0.8)",
+            minWidth: 80,
+            fontVariantNumeric: "tabular-nums",
+          }}
+        >
+          {formatTime(currentTime)} / {formatTime(totalDuration)}
+        </span>
+
+        <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: `${progressPercent}%`,
+              background: "#3b82f6",
+              borderRadius: 2,
+              transition: isDragging ? "none" : "width 0.1s linear",
+            }}
+          />
+          <div
+            style={{
+              position: "absolute",
+              top: "50%",
+              left: `${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>
+    </>
+  )
+}
+
+export default FrontendPreviewPlayer

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

@@ -1,20 +1,21 @@
 /**
  * GeneratePage 步骤内容渲染
  * 根据当前步骤渲染对应的 Step 组件
- * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 预览(4) → 标题(5) → 封面(6) → 确认(7)
+ * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 标题(4) → 预览(5) → 封面(6) → 确认(7)
+ *
+ * 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"
 import type { PresetVoiceItem } from "@/api/voices"
 import type { VoiceClone } from "@/api/voice-clone"
-import type { CoverConfig } from "../../editing-planner/types"
+import type { CoverConfig } from "../types/cover"
 import type { TitleSettings } from "../types"
-import type { PreviewItem, PreviewStatus } from "../hooks/useStep4Preview"
 import Step1TemplateSelect from "../components/Step1TemplateSelect"
 import Step2MaterialSelect from "../components/Step2MaterialSelect"
 import Step3VoiceSelect from "../components/Step5VoiceSelect"
-import Step4GeneratePreview from "../components/Step4GeneratePreview"
-import Step5TitleSettings from "../components/Step4TitleSettings"
+import Step5GeneratePreview from "../components/Step5GeneratePreview"
+import Step4TitleSettings from "../components/Step4TitleSettings"
 import Step6CoverSettings from "../components/Step6CoverSettings"
 import Step7ConfirmGenerate from "../components/Step7ConfirmGenerate"
 import type { GeneratedVideo } from "@/api/template-editor"
@@ -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
@@ -42,6 +54,7 @@ export interface GenerateStepContentProps {
   /* 配音 */
   selectedVoice: string
   onSelectedVoiceChange: (id: string) => void
+  totalVideoDuration?: number
   voiceMode: "preset" | "custom" | "clone"
   onVoiceModeChange: (mode: "preset" | "custom" | "clone") => void
   selectedClonedVoice: string
@@ -63,21 +76,6 @@ 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
-  previewTemplateName: string
-  previewMaterialCount: string
-  onGeneratePreview: () => void
-  onRegeneratePreview: () => void
 }
 
 export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) => {
@@ -94,11 +92,22 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
     onSmartSelectedIdsChange,
     titleSettings,
     onTitleSettingsChange,
+    onUpdatePosition,
+    onUpdateFont,
+    onUpdateSize,
+    onToggleBold,
+    onToggleItalic,
+    onToggleStroke,
+    onToggleShadow,
+    onApplyPreset,
+    activePreset,
+    titlePresets,
     coverSettings,
     onCoverSettingsChange,
     duration,
     selectedVoice,
     onSelectedVoiceChange,
+    totalVideoDuration,
     voiceMode,
     selectedClonedVoice,
     clonedVoices,
@@ -112,20 +121,6 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
     onRetry,
     onDismissError,
     presetVoices,
-    videoRatio,
-    previewCount,
-    onPreviewCountChange,
-    previewItems,
-    previewSelectedIndex,
-    onSelectPreview,
-    previewOverallStatus,
-    previewOverallError,
-    previewOverallProgress,
-    previewAnyGenerating,
-    previewTemplateName,
-    previewMaterialCount,
-    onGeneratePreview,
-    onRegeneratePreview,
   } = props
 
   switch (currentStep) {
@@ -153,33 +148,30 @@ export const GenerateStepContent: React.FC<GenerateStepContentProps> = (props) =
         <Step3VoiceSelect
           selectedVoice={selectedVoice}
           onSelectedVoiceChange={onSelectedVoiceChange}
+          totalVideoDuration={totalVideoDuration}
         />
       )
     case 4:
       return (
-        <Step4GeneratePreview
-          templateName={previewTemplateName}
-          materialCount={previewMaterialCount}
-          duration={duration}
-          videoRatio={videoRatio}
-          previewCount={previewCount}
-          onPreviewCountChange={onPreviewCountChange}
-          items={previewItems}
-          selectedIndex={previewSelectedIndex}
-          onSelectPreview={onSelectPreview}
-          overallStatus={previewOverallStatus}
-          overallError={previewOverallError}
-          overallProgress={previewOverallProgress}
-          anyGenerating={previewAnyGenerating}
-          onGeneratePreview={onGeneratePreview}
-          onRegeneratePreview={onRegeneratePreview}
+        <Step4TitleSettings
+          titleSettings={titleSettings}
+          onTitleSettingsChange={onTitleSettingsChange}
         />
       )
     case 5:
       return (
-        <Step5TitleSettings
+        <Step5GeneratePreview
           titleSettings={titleSettings}
-          onTitleSettingsChange={onTitleSettingsChange}
+          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

@@ -1,387 +1,250 @@
 /**
  * 右侧预览视频面板
- * Step4 生成预览后常驻显示预览视频
- * Step5+ 用 Canvas 绘制标题预览（替代 CSS overlay，与 ASS 渲染行为一致）
+ * Step4+: 显示预览视频面板
+ * 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：标题预览仅在有视频时显示（叠加在视频画面上方）。
- * 无视频状态（idle/loading/error）下不再单独显示标题预览，这是有意为之的设计简化。
+ * 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
  *
- * Canvas 居中修复说明：
- * Canvas 的 CSS 位置和尺寸直接匹配视频实际渲染区域（通过 getBoundingClientRect），
- * 绘制坐标系基于 Canvas 自身尺寸，x = w/2 即可实现水平居中，
- * 避免容器与视频尺寸不一致时浏览器拉伸 Canvas 导致居中偏移。
+ * 布局：本组件提供 .xx-preview-video 容器（position: relative + overflow: hidden）
+ * FrontendPreviewPlayer 的内容通过 absolute 定位填充容器
+ * TitleOverlay 通过 absolute 定位 + z-index: 30 覆盖在最上层
  */
-import React, { useRef, useEffect, useCallback } from "react"
-import { PlayCircleOutlined, LoadingOutlined } from "@ant-design/icons"
-import type { PreviewResult, PreviewStatus } from "../hooks/useStep4Preview"
+import React, { useMemo, useRef, useState, useEffect } 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
-  /** 标题文字（Step5 起传入） */
-  titleText?: string
-  /** 标题样式设置（Step5 起传入） */
+  /** 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
+  /** 配音音频 URL */
+  voiceAudioUrl?: string
 }
 
-/* ── Canvas 绘制工具函数 ── */
+/* ── 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
 
 /**
- * 将文本按 maxWidth 逐字换行，返回行数组。
- * 与 ASS 字幕引擎的逐字换行行为一致。
+ * 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 wrapText(ctx: CanvasRenderingContext2D, text: string, maxWidth: number): string[] {
-  const lines: string[] = []
-  let currentLine = ""
-  for (const char of text) {
-    const testLine = currentLine + char
-    if (ctx.measureText(testLine).width > maxWidth && currentLine) {
-      lines.push(currentLine)
-      currentLine = char
-    } else {
-      currentLine = testLine
-    }
-  }
-  if (currentLine) lines.push(currentLine)
-  return lines
-}
+function getPositionStyle(position: string): React.CSSProperties {
+  const sidePercent = (ASS_TITLE_MARGIN_SIDE / 1280) * 100
 
-/**
- * 在 canvas 上绘制标题文字（含描边/阴影/多行居中）
- *
- * Canvas 已通过 CSS 定位到视频实际渲染位置，
- * 坐标系基于 Canvas 自身尺寸，居中直接使用 w/2。
- *
- * @param ctx canvas 上下文
- * @param w canvas CSS 宽度（= 视频渲染宽度）
- * @param h canvas CSS 高度（= 视频渲染高度）
- * @param text 标题文字
- * @param settings 标题样式
- * @param paddingX 左右边距（px），与 ASS 的 MarginL/MarginR 对应
- * @param position "top" | "center" | "bottom"
- * @param topOffset 顶部/底部偏移量
- */
-function drawTitleOnCanvas(
-  ctx: CanvasRenderingContext2D,
-  w: number,
-  h: number,
-  text: string,
-  settings: TitleSettings,
-  paddingX: number,
-  position: string,
-  topOffset: number,
-) {
-  const dpr = window.devicePixelRatio || 1
-
-  // 设置 canvas 物理像素尺寸（高清屏适配）
-  ctx.canvas.width = Math.round(w * dpr)
-  ctx.canvas.height = Math.round(h * dpr)
-  ctx.scale(dpr, dpr)
-
-  // 清除
-  ctx.clearRect(0, 0, w, h)
-
-  // 可用宽度 = 总宽 - 左右边距
-  const availableWidth = w - paddingX * 2
-  if (availableWidth <= 0) return
-
-  // 字体设置
-  const fontSize = Math.round(Math.min(settings.size, 36))
-  const fontWeight = settings.bold ? "bold" : "normal"
-  const fontStyle = settings.italic ? "italic" : "normal"
-  ctx.font = `${fontStyle} ${fontWeight} ${fontSize}px "${settings.font}"`
-
-  // 文字属性
-  ctx.textAlign = "center"
-  ctx.textBaseline = "middle"
-  ctx.fillStyle = settings.color
-
-  const lineHeight = fontSize * 1.4
-
-  // 描边 & 阴影
-  if (settings.stroke) {
-    ctx.strokeStyle = "rgba(0,0,0,0.6)"
-    ctx.lineWidth = 2
-    ctx.lineJoin = "round"
-  }
-  if (settings.shadow) {
-    ctx.shadowColor = "rgba(0,0,0,0.7)"
-    ctx.shadowBlur = 4
-    ctx.shadowOffsetX = 2
-    ctx.shadowOffsetY = 2
-  }
-
-  // 换行
-  const displayText = text && text.trim() ? text : "请选择或输入标题"
-  const lines = wrapText(ctx, displayText, availableWidth)
-
-  // 起始 Y：根据 position 计算
-  const totalTextHeight = lines.length * lineHeight
-  let startY: number
   switch (position) {
-    case "top":
-      startY = topOffset
-      break
-    case "center":
-      startY = (h - totalTextHeight) / 2 + lineHeight / 2
-      break
     case "bottom":
+      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: `${sidePercent}%`,
+        textAlign: "center",
+      }
+    case "top":
     default:
-      startY = h - topOffset - totalTextHeight + lineHeight / 2
-      break
-  }
-
-  // 居中 x = w/2（Canvas 已定位到视频位置，无需额外偏移）
-  const x = w / 2
-  lines.forEach((line, i) => {
-    const y = startY + i * lineHeight
-    if (settings.stroke) ctx.strokeText(line, x, y)
-    ctx.fillText(line, x, y)
-  })
-
-  // 重置 shadow（避免影响后续绘制）
-  if (settings.shadow) {
-    ctx.shadowColor = "transparent"
-    ctx.shadowBlur = 0
-    ctx.shadowOffsetX = 0
-    ctx.shadowOffsetY = 0
+      return {
+        top: `${(ASS_TITLE_MARGIN_TOP / ASS_VIDEO_HEIGHT) * 100}%`,
+        left: `${sidePercent}%`,
+        right: `${sidePercent}%`,
+        textAlign: "center",
+      }
   }
 }
 
-/* ── 组件 ── */
+/**
+ * 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, containerHeight: number): React.CSSProperties {
+  // 用 px 计算 fontSize，不再依赖父元素 font-size 的百分比
+  const fontSizePx =
+    containerHeight > 0
+      ? (Math.min(settings.size, 96) / ASS_VIDEO_HEIGHT) * containerHeight
+      : (Math.min(settings.size, 96) / ASS_VIDEO_HEIGHT) * 400 // fallback
+
+  const base: React.CSSProperties = {
+    fontFamily: settings.font || "思源黑体",
+    fontSize: `${fontSizePx}px`,
+    color: settings.color || "#ffffff",
+    fontWeight: settings.bold ? 700 : 400,
+    fontStyle: settings.italic ? "italic" : "normal",
+    lineHeight: 1.3,
+    wordBreak: "break-word",
+    pointerEvents: "none",
+    userSelect: "none",
+    paddingLeft: `${(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
+ * 始终渲染：有标题显示标题，无标题显示占位文本"标题预览"
+ * z-index: 20（在视频 z-index:1 和控制条 z-index:10 之上）
+ */
+const TitleOverlay: React.FC<{ titleSettings: TitleSettings }> = ({ titleSettings }) => {
+  const containerRef = useRef<HTMLDivElement>(null)
+  const [containerHeight, setContainerHeight] = useState(400) // fallback
+
+  // ResizeObserver 获取容器实际高度
+  useEffect(() => {
+    const el = containerRef.current
+    if (!el) return
+    const ro = new ResizeObserver((entries) => {
+      for (const entry of entries) {
+        const h = entry.contentRect.height
+        if (h > 0) setContainerHeight(h)
+      }
+    })
+    ro.observe(el)
+    // 初始化也读一次
+    const rect = el.getBoundingClientRect()
+    if (rect.height > 0) setContainerHeight(rect.height)
+    return () => ro.disconnect()
+  }, [])
+
+  const positionStyle = useMemo(
+    () => getPositionStyle(titleSettings.position),
+    [titleSettings.position],
+  )
+  const titleStyle = useMemo(
+    () => buildTitleStyle(titleSettings, containerHeight),
+    // eslint-disable-next-line react-hooks/exhaustive-deps -- 已逐字段列出 titleSettings 依赖
+    [
+      containerHeight,
+      titleSettings.font,
+      titleSettings.size,
+      titleSettings.color,
+      titleSettings.bold,
+      titleSettings.italic,
+      titleSettings.stroke,
+      titleSettings.shadow,
+    ],
+  )
+
+  const displayTitle = titleSettings.title?.trim() || "标题预览"
+
+  return (
+    <div
+      ref={containerRef}
+      style={{
+        position: "absolute",
+        inset: 0,
+        zIndex: 20,
+        pointerEvents: "none",
+        overflow: "hidden",
+      }}
+    >
+      <div
+        style={{
+          ...positionStyle,
+          ...titleStyle,
+          position: "absolute",
+        }}
+      >
+        {displayTitle}
+      </div>
+    </div>
+  )
+}
+
+/* ── 主组件 ── */
 
 export const PreviewVideoPanel: React.FC<PreviewVideoPanelProps> = ({
-  previewStatus,
-  previewResult,
-  previewError,
-  progress,
+  assets,
+  template,
   videoRatio,
-  onRegenerate,
-  titleText,
+  assetsReady,
+  assetsLoading,
   titleSettings,
+  voiceAudioUrl,
 }) => {
-  const hasPreview = previewStatus === "ready" && previewResult
-  const isLoading = previewStatus === "pending" || previewStatus === "generating"
-  const isError = previewStatus === "error"
-  const showTitlePreview = !!titleSettings
   const videoAspectStyle = { aspectRatio: (videoRatio || "16:9").replace(":", "/") }
 
-  // video 模式 refs
-  const canvasRef = useRef<HTMLCanvasElement>(null)
-  const containerRef = useRef<HTMLDivElement>(null)
-  const videoRef = useRef<HTMLVideoElement>(null)
-
-  // 字体加载状态（ref 供 draw 回调同步读取，无需 state 避免触发不必要的重渲染）
-  const fontLoadedRef = useRef(false)
-
-  /** 在 video canvas 上绘制标题 */
-  const drawVideoTitle = useCallback(() => {
-    // 通过 ref 读取字体状态，避免 fontLoaded 进入依赖数组
-    if (!fontLoadedRef.current) return
-    const canvas = canvasRef.current
-    const container = containerRef.current
-    if (!canvas || !container || !titleSettings) return
-    const ctx = canvas.getContext("2d")
-    if (!ctx) return
-
-    const containerRect = container.getBoundingClientRect()
-    if (containerRect.width <= 0 || containerRect.height <= 0) return
-
-    // 使用 video 元素的 getBoundingClientRect 获取实际渲染尺寸和位置
-    const videoEl = videoRef.current
-    let drawW = containerRect.width
-    let drawH = containerRect.height
-    let offsetX = 0
-    let offsetY = 0
-
-    if (videoEl && videoEl.clientWidth > 0 && videoEl.clientHeight > 0) {
-      const videoRect = videoEl.getBoundingClientRect()
-      drawW = videoRect.width
-      drawH = videoRect.height
-      offsetX = videoRect.left - containerRect.left
-      offsetY = videoRect.top - containerRect.top
-    }
-
-    // 更新 Canvas CSS 位置和尺寸，使其与视频实际渲染区域完全对齐
-    canvas.style.left = `${offsetX}px`
-    canvas.style.top = `${offsetY}px`
-    canvas.style.width = `${drawW}px`
-    canvas.style.height = `${drawH}px`
-
-    // 绘制时，坐标系基于 Canvas 自身尺寸，无需额外偏移
-    drawTitleOnCanvas(
-      ctx,
-      drawW,
-      drawH,
-      titleText || "",
-      titleSettings,
-      40,
-      titleSettings.position,
-      60,
-    )
-  }, [titleText, titleSettings])
-
-  // video 模式：ResizeObserver 监听容器尺寸变化 → 重绘
-  useEffect(() => {
-    if (!showTitlePreview || !hasPreview) return
-    const container = containerRef.current
-    if (!container) return
-
-    const observer = new ResizeObserver(() => {
-      drawVideoTitle()
-    })
-    observer.observe(container)
-    requestAnimationFrame(drawVideoTitle)
-
-    return () => observer.disconnect()
-  }, [showTitlePreview, hasPreview, drawVideoTitle])
-
-  // 字体加载检测：字体变更时重新检测，确保 measureText 使用正确字体
-  useEffect(() => {
-    if (!showTitlePreview || !titleSettings) {
-      fontLoadedRef.current = false
-      return
-    }
-    let cancelled = false
-    fontLoadedRef.current = false
-
-    const fontWeight = titleSettings.bold ? "bold" : ""
-    const fontStyle = titleSettings.italic ? "italic" : ""
-    const fontSpec =
-      `${fontStyle} ${fontWeight} ${titleSettings.size}px "${titleSettings.font}"`.trim()
-
-    const onFontReady = () => {
-      if (cancelled) return
-      fontLoadedRef.current = true
-      // ref 已同步更新，显式触发重绘（draw 内部通过 ref 检查字体状态）
-      requestAnimationFrame(() => {
-        if (!cancelled) {
-          drawVideoTitle()
-        }
-      })
-    }
-
-    if (document.fonts.check(fontSpec)) {
-      onFontReady()
-      return
-    }
-
-    document.fonts
-      .load(fontSpec)
-      .then(() => onFontReady())
-      .catch(() => {
-        document.fonts.ready.then(() => onFontReady())
-      })
-
-    return () => {
-      cancelled = true
-    }
-  }, [showTitlePreview, titleSettings, drawVideoTitle])
-
-  // video 加载完成后重绘
-  const handleVideoLoaded = useCallback(() => {
-    if (showTitlePreview) {
-      requestAnimationFrame(drawVideoTitle)
-    }
-  }, [showTitlePreview, drawVideoTitle])
-
   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">在第 3 步生成预览后在此查看</p>
-        </div>
-      )}
-
-      {/* 生成中 */}
-      {isLoading && (
-        <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 ${progress}%`}
-              </p>
-            </div>
+      {/* ✅ 预览容器 — 唯一的 .xx-preview-video 容器
+          内部所有内容（视频、控制条、标题叠加层）通过 absolute 定位填充 */}
+      <div className="xx-preview-video" style={{ ...videoAspectStyle, position: "relative" }}>
+        {/* 加载中状态 */}
+        {assetsLoading && (
+          <div
+            className="xx-preview-loading-center"
+            style={{
+              position: "absolute",
+              inset: 0,
+              display: "flex",
+              flexDirection: "column",
+              alignItems: "center",
+              justifyContent: "center",
+              zIndex: 5,
+            }}
+          >
+            <LoadingOutlined style={{ fontSize: 36, color: "#fff" }} spin />
+            <p style={{ marginTop: 12, color: "rgba(255,255,255,0.8)", fontSize: 14 }}>
+              加载素材中...
+            </p>
           </div>
-          <div className="xx-preview-progress-bar-wrap">
-            <div className="xx-preview-progress-fill" style={{ width: `${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>
-        </div>
-      )}
+        {/* 前端播放器（视频 + 控制条 + 播放按钮）*/}
+        <FrontendPreviewPlayer
+          assets={assets}
+          template={template}
+          videoRatio={videoRatio}
+          ready={assetsReady}
+          voiceAudioUrl={voiceAudioUrl}
+        />
 
-      {/* 预览成功 + Canvas 标题叠加 */}
-      {hasPreview && (
-        <div ref={containerRef} style={{ position: "relative" }}>
-          <div className="xx-preview-video" style={videoAspectStyle}>
-            <video
-              ref={videoRef}
-              src={previewResult.videoUrl}
-              controls
-              preload="metadata"
-              onLoadedMetadata={handleVideoLoaded}
-            />
-          </div>
-          {showTitlePreview && (
-            <canvas
-              ref={canvasRef}
-              style={{
-                position: "absolute",
-                top: 0,
-                left: 0,
-                width: "100%",
-                height: "100%",
-                zIndex: 1,
-                pointerEvents: "none",
-              }}
-            />
-          )}
-        </div>
-      )}
+        {/* CSS 标题实时预览层 — z-index: 20，始终渲染在内容层之上 */}
+        {titleSettings && <TitleOverlay titleSettings={titleSettings} />}
+      </div>
 
-      {/* 预览信息 */}
-      {hasPreview && previewResult && (
+      {/* 素材信息 */}
+      {assetsReady && assets.length > 0 && (
         <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>
+            <span>素材数</span>
+            <span>{assets.length} 个</span>
           </div>
           <div className="xx-preview-info-row">
             <span>比例</span>

apps/web/src/pages/generate/components/Step4GeneratePreview.tsx

@@ -1,294 +0,0 @@
-/**
- * Step 4 生成预览组件（支持多预览）
- * 调用后端预览生成接口，展示多个真实视频预览（网格布局）
- */
-import React from "react"
-import {
-  CheckCircleFilled,
-  LoadingOutlined,
-  ReloadOutlined,
-  PlayCircleOutlined,
-  ExclamationCircleFilled,
-  ClockCircleOutlined,
-} from "@ant-design/icons"
-import { InputNumber } from "antd"
-import type { PreviewItem, PreviewStatus } from "../hooks/useStep4Preview"
-
-interface Step4GeneratePreviewProps {
-  templateName: string
-  materialCount: string
-  duration: number
-  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
-}
-
-/** 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 Step4GeneratePreview: React.FC<Step4GeneratePreviewProps> = ({
-  templateName: _templateName,
-  materialCount: _materialCount,
-  videoRatio,
-  previewCount,
-  onPreviewCountChange,
-  items,
-  selectedIndex,
-  onSelectPreview,
-  overallStatus,
-  overallError,
-  overallProgress,
-  anyGenerating,
-  onGeneratePreview,
-  onRegeneratePreview,
-}) => {
-  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>
-
-      {/* 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>
-      )}
-
-      {/* 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",
-                }}
-              >
-                {/* 缩略图/状态区域 */}
-                <div
-                  style={{
-                    aspectRatio,
-                    background: "#000",
-                    display: "flex",
-                    alignItems: "center",
-                    justifyContent: "center",
-                    position: "relative",
-                  }}
-                >
-                  {item.status === "ready" && item.result && (
-                    <video
-                      src={item.result.videoUrl}
-                      controls
-                      autoPlay
-                      muted
-                      loop
-                      preload="metadata"
-                      style={{
-                        width: "100%",
-                        height: "100%",
-                        objectFit: "cover",
-                      }}
-                    />
-                  )}
-                  {(item.status === "pending" || item.status === "generating") && (
-                    <div style={{ textAlign: "center" }}>
-                      <LoadingOutlined style={{ fontSize: 24, color: "#fff" }} spin />
-                      <p style={{ color: "rgba(255,255,255,0.8)", fontSize: 12, marginTop: 8 }}>
-                        {item.status === "pending" ? "排队中..." : `生成中 ${item.progress}%`}
-                      </p>
-                    </div>
-                  )}
-                  {item.status === "error" && (
-                    <div style={{ textAlign: "center", padding: 8 }}>
-                      <ExclamationCircleFilled style={{ fontSize: 20, color: "#ef4444" }} />
-                      <p
-                        style={{
-                          color: "rgba(255,255,255,0.7)",
-                          fontSize: 11,
-                          marginTop: 4,
-                        }}
-                      >
-                        生成失败
-                      </p>
-                    </div>
-                  )}
-                  {/* 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>
-                {/* 底部信息 */}
-                {item.status === "ready" && item.result && (
-                  <div
-                    style={{
-                      padding: "6px 8px",
-                      background: "#fafafa",
-                      fontSize: 11,
-                      color: "#666",
-                      display: "flex",
-                      justifyContent: "space-between",
-                    }}
-                  >
-                    <span>{item.result.duration.toFixed(1)}秒</span>
-                    <span>{item.result.clipCount}段</span>
-                  </div>
-                )}
-              </div>
-            )
-          })}
-        </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>
-      )}
-    </div>
-  )
-}
-
-export default Step4GeneratePreview

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

@@ -0,0 +1,84 @@
+/**
+ * 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 { PlayCircleOutlined } from "@ant-design/icons"
+import { POSITION_OPTIONS, FONT_OPTIONS } from "../constants"
+import type { TitleSettings } from "../types"
+import TitleStylePanel from "./title/TitleStylePanel"
+
+interface Step5GeneratePreviewProps {
+  /* 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 }[]
+}
+
+const Step5GeneratePreview: React.FC<Step5GeneratePreviewProps> = ({
+  titleSettings,
+  onUpdatePosition,
+  onUpdateFont,
+  onUpdateSize,
+  onToggleBold,
+  onToggleItalic,
+  onToggleStroke,
+  onToggleShadow,
+  onApplyPreset,
+  activePreset,
+  titlePresets,
+}) => {
+  return (
+    <div className="xx-form-section">
+      <h3>🎬 预览设置</h3>
+
+      {/* 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>
+
+      {/* 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>
+  )
+}
+
+export default Step5GeneratePreview

apps/web/src/pages/generate/components/Step5VoiceSelect.tsx

@@ -5,13 +5,15 @@
 import React, { useState, useRef, useCallback } from "react"
 import { useNavigate } from "react-router-dom"
 import { useQuery } from "@tanstack/react-query"
-import { AudioOutlined, SoundOutlined } from "@ant-design/icons"
+import { AudioOutlined, SoundOutlined, WarningOutlined } from "@ant-design/icons"
+import { Modal } from "antd"
 import { getAssetsByKind } from "@/api/assets"
 import type { AssetItem } from "@/api/assets"
 
 interface Step5VoiceSelectProps {
   selectedVoice: string
   onSelectedVoiceChange: (id: string) => void
+  totalVideoDuration?: number
 }
 
 /** 格式化时长 mm:ss */
@@ -34,10 +36,13 @@ const formatFileSize = (bytes?: number): string => {
 const Step5VoiceSelect: React.FC<Step5VoiceSelectProps> = ({
   selectedVoice,
   onSelectedVoiceChange,
+  totalVideoDuration = 0,
 }) => {
   const navigate = useNavigate()
   const [playingId, setPlayingId] = useState<string | null>(null)
   const audioRef = useRef<HTMLAudioElement | null>(null)
+  const [durationWarningOpen, setDurationWarningOpen] = useState(false)
+  const [pendingVoiceId, setPendingVoiceId] = useState<string | null>(null)
 
   // 获取用户上传的配音素材
   const { data: materials = [], isLoading } = useQuery({
@@ -78,14 +83,38 @@ const Step5VoiceSelect: React.FC<Step5VoiceSelectProps> = ({
     [playingId],
   )
 
-  /** 选中素材 */
+  /** 选中素材（含时长校验） */
   const handleSelect = useCallback(
     (id: string) => {
+      // 如果启用了时长校验，且配音时长不足
+      if (totalVideoDuration > 0) {
+        const material = materials.find((m) => m.id === id)
+        if (material && (material.duration || 0) < totalVideoDuration) {
+          setPendingVoiceId(id)
+          setDurationWarningOpen(true)
+          return
+        }
+      }
       onSelectedVoiceChange(id)
     },
-    [onSelectedVoiceChange],
+    [onSelectedVoiceChange, totalVideoDuration, materials],
   )
 
+  /** 确认使用时长不足的配音 */
+  const handleConfirmUseAnyway = useCallback(() => {
+    if (pendingVoiceId) {
+      onSelectedVoiceChange(pendingVoiceId)
+    }
+    setDurationWarningOpen(false)
+    setPendingVoiceId(null)
+  }, [pendingVoiceId, onSelectedVoiceChange])
+
+  /** 取消选择 */
+  const handleCancelSelection = useCallback(() => {
+    setDurationWarningOpen(false)
+    setPendingVoiceId(null)
+  }, [])
+
   /** 跳转到配音库上传 */
   const handleGoToUpload = useCallback(() => {
     navigate("/app/voices")
@@ -238,15 +267,65 @@ const Step5VoiceSelect: React.FC<Step5VoiceSelectProps> = ({
                   justifyContent: "space-between",
                   fontSize: 12,
                   color: "#999",
+                  alignItems: "center",
                 }}
               >
-                <span>{formatDuration(item.duration)}</span>
+                <span style={{ display: "flex", alignItems: "center", gap: 4 }}>
+                  {formatDuration(item.duration)}
+                  {totalVideoDuration > 0 &&
+                    (Number(item.duration) || 0) < Number(totalVideoDuration) && (
+                      <span
+                        style={{
+                          color: "#ff4d4f",
+                          fontSize: 11,
+                          fontWeight: 500,
+                          display: "inline-flex",
+                          alignItems: "center",
+                          gap: 2,
+                        }}
+                      >
+                        <WarningOutlined />
+                        时长不足
+                      </span>
+                    )}
+                </span>
                 <span>{formatFileSize(item.file_size)}</span>
               </div>
             </div>
           )
         })}
       </div>
+
+      {/* 时长不足警告弹窗 */}
+      <Modal
+        title={
+          <span style={{ display: "flex", alignItems: "center", gap: 8 }}>
+            <WarningOutlined style={{ color: "#faad14" }} />
+            配音时长不足
+          </span>
+        }
+        open={durationWarningOpen}
+        onOk={handleConfirmUseAnyway}
+        onCancel={handleCancelSelection}
+        okText="仍要使用"
+        cancelText="重新选择"
+        okButtonProps={{ danger: true }}
+      >
+        {(() => {
+          const pendingMaterial = pendingVoiceId
+            ? materials.find((m) => m.id === pendingVoiceId)
+            : null
+          return (
+            <p>
+              该配音时长（
+              <strong>{pendingMaterial ? formatDuration(pendingMaterial.duration) : "--"}</strong>
+              ）短于视频总时长（
+              <strong>{formatDuration(totalVideoDuration)}</strong>
+              ），播放时配音可能提前结束，建议选择更长的配音素材。
+            </p>
+          )
+        })()}
+      </Modal>
     </div>
   )
 }

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

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

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

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

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

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

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

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

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

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

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

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

apps/web/src/pages/generate/generate.css

@@ -895,13 +895,12 @@
   max-height: 400px;
   border-radius: var(--radius-md);
   background: linear-gradient(135deg, var(--color-gray-900), var(--color-primary-900));
-  display: grid;
-  place-items: center;
   color: var(--text-inverse);
   font-size: 36px;
   position: relative;
   overflow: hidden;
   margin-bottom: 16px;
+  isolation: isolate;
 }
 
 .xx-preview-video::before {
@@ -910,6 +909,7 @@
   inset: 0;
   background: radial-gradient(circle at 72% 28%, rgba(255, 255, 255, 0.2), transparent 40%);
   pointer-events: none;
+  z-index: 0;
 }
 
 .xx-preview-video video {
@@ -2881,11 +2881,11 @@
   overflow: hidden;
 }
 
-.ant-modal-content {
+.xx-preview-modal .ant-modal-content {
   padding: 0 !important;
 }
 
-.ant-modal-close {
+.xx-preview-modal .ant-modal-close {
   color: #fff !important;
 }
 

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

@@ -1,5 +1,5 @@
 import type { GeneratedVideo, EditPlanConfig } from "@/api/template-editor"
-import type { CoverConfig } from "../../../editing-planner/types"
+import type { CoverConfig } from "../../types/cover"
 import type { TitleSettings } from "../../types"
 
 /** useGenerateVideo 入参 */
@@ -19,8 +19,6 @@ export interface UseGenerateVideoProps {
   autoSubtitles: boolean
   bgm: boolean
   generateCount: number
-  /** 预览任务的 task_id（用于新确认生成 API） */
-  previewTaskId: string
 }
 
 /** 生成阶段 */

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

@@ -0,0 +1,832 @@
+/**
+ * Canvas + WebCodecs 播放器核心 Hook
+ * MP4 → mp4box.js 解封装 → VideoDecoder 解码帧 → Canvas 绘制
+ *
+ * 浏览器不支持 WebCodecs 时返回 hasSupport=false，由调用方 fallback
+ */
+import { useRef, useCallback, useEffect, useState } from "react"
+import { createFile } from "mp4box"
+import type { Movie, Sample } from "mp4box"
+
+// ── MP4 Box 解析辅助函数 ──
+
+// MP4 标准容器 box 列表（递归时会进入这些 box 内部搜索子 box）
+const MP4_CONTAINER_TYPES = [
+  "moov",
+  "trak",
+  "mdia",
+  "minf",
+  "stbl",
+  "stsd",
+  "dinf",
+  "edts",
+  "udta",
+  "meta",
+  "tref",
+]
+
+const VISUAL_SAMPLE_ENTRY_TYPES = ["avc1", "avc3", "hvc1", "hev1"]
+
+/**
+ * 递归搜索 box 树，找到 hvcC 或 avcC box 并返回其配置数据（不含 8 字节 box header）
+ *
+ * MP4 box 嵌套结构：moov → trak → mdia → minf → stbl → stsd → hev1 → hvcC
+ * - 普通容器 box 从 offset+8 开始递归
+ * - stsd 有额外 8 字节头（version/flags 4B + entry_count 4B），从 offset+16 开始
+ * - VisualSampleEntry (avc1/avc3/hvc1/hev1) 前 78 字节是固定字段，子 box 从 offset+8+78 开始
+ */
+function findCodecConfigRecursive(
+  buffer: ArrayBuffer,
+  start: number,
+  end: number,
+): ArrayBuffer | undefined {
+  const view = new DataView(buffer)
+  let offset = start
+
+  while (offset < end - 8) {
+    const size = view.getUint32(offset)
+    if (size < 8 || offset + size > end) break
+
+    const type = String.fromCharCode(
+      view.getUint8(offset + 4),
+      view.getUint8(offset + 5),
+      view.getUint8(offset + 6),
+      view.getUint8(offset + 7),
+    )
+
+    // 找到目标 codec 配置 box，返回内容（不含 8 字节 header）
+    if (type === "avcC" || type === "hvcC") {
+      console.log("[findCodecConfig] Found", type, "at offset", offset, "size", size)
+      return buffer.slice(offset + 8, offset + size)
+    }
+
+    // VisualSampleEntry：前 78 字节是固定字段，子 box 在 78 字节之后
+    if (VISUAL_SAMPLE_ENTRY_TYPES.includes(type)) {
+      const childResult = findCodecConfigRecursive(buffer, offset + 8 + 78, offset + size)
+      if (childResult) return childResult
+    }
+    // stsd：额外 8 字节头（version/flags 4B + entry_count 4B），子 box 在 offset+16
+    else if (type === "stsd") {
+      const childResult = findCodecConfigRecursive(buffer, offset + 8 + 8, offset + size)
+      if (childResult) return childResult
+    }
+    // 标准容器 box：从 offset+8 开始递归
+    else if (MP4_CONTAINER_TYPES.includes(type)) {
+      const childResult = findCodecConfigRecursive(buffer, offset + 8, offset + size)
+      if (childResult) return childResult
+    }
+
+    offset += size
+  }
+  return undefined
+}
+
+// ── 帧队列（环形缓冲区） ──
+interface FrameEntry {
+  frame: VideoFrame
+  pts: number // 全局时间戳（秒），已按片段偏移对齐
+  duration: number // 帧持续时长（秒）
+}
+
+class FrameQueue {
+  private frames: FrameEntry[] = []
+  private maxSize: number
+
+  constructor(maxSize = 5) {
+    this.maxSize = maxSize
+  }
+
+  push(entry: FrameEntry) {
+    while (this.frames.length >= this.maxSize) {
+      const old = this.frames.shift()
+      old?.frame.close()
+    }
+    this.frames.push(entry)
+  }
+
+  /** 获取当前时间戳应显示的帧 */
+  getCurrentFrame(timestamp: number): VideoFrame | null {
+    let best: FrameEntry | null = null
+    let bestIdx = -1
+    for (let i = 0; i < this.frames.length; i++) {
+      const f = this.frames[i]
+      if (f.pts <= timestamp + 0.01) {
+        best = f
+        bestIdx = i
+      }
+    }
+    for (let i = 0; i < bestIdx; i++) {
+      this.frames[i].frame.close()
+    }
+    if (bestIdx >= 0) {
+      this.frames = this.frames.slice(bestIdx)
+    }
+    return best?.frame ?? null
+  }
+
+  clear() {
+    for (const f of this.frames) {
+      f.frame.close()
+    }
+    this.frames = []
+  }
+
+  get size() {
+    return this.frames.length
+  }
+}
+
+// ── 片段元数据 ──
+interface SegmentMeta {
+  assetId: string
+  videoUrl: string
+  /** 该片段在全局时间轴上的起始时间（秒） */
+  globalStartTime: number
+  /** 该片段在全局时间轴上的结束时间（秒） */
+  globalEndTime: number
+  /** 视频轨道 ID */
+  trackId: number
+  /** 视频轨道 timescale */
+  timescale: number
+  /** 编解码器 */
+  codec: string
+  /** 视频宽度（像素） */
+  videoWidth: number
+  /** 视频高度（像素） */
+  videoHeight: number
+  /** 解码器配置数据（HEVC hvcC / H.264 avcC），WebCodecs 必需 */
+  description?: ArrayBuffer
+  /** 前端提取的样本数据（已按时间范围过滤，从关键帧开始） */
+  samples: Sample[]
+}
+
+// ── 播放器状态 ──
+export interface CanvasPlayerState {
+  hasSupport: boolean
+  isPlaying: boolean
+  currentTime: number
+  duration: number
+  isReady: boolean
+  isBuffering: boolean
+}
+
+export interface CanvasPlayerControls {
+  play: () => void
+  pause: () => void
+  seek: (time: number) => void
+  destroy: () => void
+}
+
+interface SegmentSource {
+  assetId: string
+  videoUrl: string
+  startTime: number
+  endTime: number
+}
+
+/** 检测浏览器是否支持 WebCodecs VideoDecoder */
+export function isWebCodecsSupported(): boolean {
+  return typeof window !== "undefined" && "VideoDecoder" in window && "VideoFrame" in window
+}
+
+/**
+ * useCanvasPlayer — Canvas + WebCodecs 播放器核心
+ */
+export function useCanvasPlayer(
+  canvasRef: React.RefObject<HTMLCanvasElement | null>,
+  segments: SegmentSource[],
+  titleSettings?: {
+    text: string
+    fontSize: number
+    fontFamily: string
+    color: string
+    position: "top" | "center" | "bottom"
+    bold?: boolean
+    stroke?: boolean
+    shadow?: boolean
+  },
+) {
+  const [state, setState] = useState<CanvasPlayerState>({
+    hasSupport: isWebCodecsSupported(),
+    isPlaying: false,
+    currentTime: 0,
+    duration: 0,
+    isReady: false,
+    isBuffering: false,
+  })
+
+  // ── 内部引用 ──
+  const decoderRef = useRef<VideoDecoder | null>(null)
+  const frameQueueRef = useRef(new FrameQueue(10))
+  const rafRef = useRef<number>(0)
+  const playStartRef = useRef<number>(0)
+  const playStartOffsetRef = useRef<number>(0)
+  const segmentDataRef = useRef<Map<string, ArrayBuffer>>(new Map())
+  const segmentMetaRef = useRef<SegmentMeta[]>([])
+  const videoDimRef = useRef<{ width: number; height: number }>({ width: 0, height: 0 })
+  const isDestroyedRef = useRef(false)
+  const lastProgressUpdateRef = useRef<number>(0)
+
+  // 计算总时长
+  const totalDuration = segments.reduce((sum, seg) => sum + (seg.endTime - seg.startTime), 0)
+
+  // ── 加载 MP4 文件数据 ──
+  const loadSegment = useCallback(async (segment: SegmentSource): Promise<void> => {
+    if (isDestroyedRef.current) return
+    if (segmentDataRef.current.has(segment.assetId)) return
+
+    setState((s) => ({ ...s, isBuffering: true }))
+
+    try {
+      const resp = await fetch(segment.videoUrl)
+      const buffer = await resp.arrayBuffer()
+      segmentDataRef.current.set(segment.assetId, buffer)
+    } catch (err) {
+      console.error("[useCanvasPlayer] Failed to fetch segment:", err)
+    } finally {
+      setState((s) => ({ ...s, isBuffering: false }))
+    }
+  }, [])
+
+  // ── 从 MP4 buffer 提取编解码器配置数据（avcC / hvcC） ──
+  // WebCodecs VideoDecoder 对 HEVC/H.265 必须提供 description 字段
+  const extractCodecDescription = useCallback((buffer: ArrayBuffer): ArrayBuffer | undefined => {
+    try {
+      const view = new DataView(buffer)
+      let offset = 0
+
+      // 查找 moov box
+      while (offset < buffer.byteLength - 8) {
+        const size = view.getUint32(offset)
+        const type = String.fromCharCode(
+          view.getUint8(offset + 4),
+          view.getUint8(offset + 5),
+          view.getUint8(offset + 6),
+          view.getUint8(offset + 7),
+        )
+        if (type === "moov") {
+          const result = findCodecConfigRecursive(buffer, offset + 8, offset + size)
+          console.log("[useCanvasPlayer] extractCodecDescription:", {
+            moovOffset: offset,
+            moovSize: size,
+            searchRange: [offset + 8, offset + size],
+            found: !!result,
+            resultByteLength: result?.byteLength,
+          })
+          return result
+        }
+        if (size === 0) break
+        offset += size
+      }
+    } catch (e) {
+      console.warn("[useCanvasPlayer] extractCodecDescription failed:", e)
+    }
+    return undefined
+  }, [])
+
+  // ── 解封装单个片段，提取轨道元数据 + 按时间范围过滤样本 ──
+  // ✅ 关键修复：改为异步函数，等待 MP4Box.js 的 onSamples 回调完成后再返回
+  const demuxSegment = useCallback(
+    async (buffer: ArrayBuffer, segIndex: number): Promise<SegmentMeta | null> => {
+      const segment = segments?.[segIndex]
+      if (!segment) {
+        console.warn("[useCanvasPlayer] No segment at index", segIndex)
+        return null
+      }
+
+      // 计算全局偏移
+      let globalStart = 0
+      for (let i = 0; i < segIndex; i++) {
+        globalStart += segments[i].endTime - segments[i].startTime
+      }
+
+      const mp4File = createFile()
+
+      return new Promise<SegmentMeta | null>((resolve) => {
+        let meta: SegmentMeta | null = null
+        let resolved = false
+
+        // ✅ 超时保护：5秒后如果 onSamples 没有触发，返回 null
+        const timeout = setTimeout(() => {
+          if (!resolved) {
+            console.error(
+              `[useCanvasPlayer] Timeout: onSamples not triggered for segment ${segIndex}`,
+            )
+            resolved = true
+            resolve(null)
+          }
+        }, 5000)
+
+        mp4File.onReady = (info: Movie) => {
+          const videoTrack = info?.videoTracks?.[0]
+
+          console.log("[useCanvasPlayer] demuxSegment:", {
+            segIndex,
+            startTime: segment.startTime,
+            endTime: segment.endTime,
+            nbSamples: videoTrack?.nb_samples,
+            codec: videoTrack?.codec,
+            videoWidth: videoTrack?.track_width,
+            videoHeight: videoTrack?.track_height,
+          })
+
+          if (!videoTrack) {
+            console.warn("[useCanvasPlayer] No video track found for segment", segIndex)
+            clearTimeout(timeout)
+            resolved = true
+            resolve(null)
+            return
+          }
+
+          // 提取编解码器配置数据（HEVC 必需，H.264 也需要）
+          const description = extractCodecDescription(buffer)
+
+          // ✅ 如果 description 缺失，无法解码 HEVC
+          if (!description) {
+            console.error(
+              `[useCanvasPlayer] No description found for segment ${segIndex}, cannot decode HEVC`,
+            )
+            clearTimeout(timeout)
+            resolved = true
+            resolve(null)
+            return
+          }
+
+          meta = {
+            assetId: segment.assetId,
+            videoUrl: segment.videoUrl,
+            globalStartTime: globalStart,
+            globalEndTime: globalStart + (segment.endTime - segment.startTime),
+            trackId: videoTrack.id ?? 1,
+            timescale: videoTrack.timescale ?? 90000,
+            codec: videoTrack.codec ?? "avc1.42E01E",
+            videoWidth: videoTrack.track_width || 1280,
+            videoHeight: videoTrack.track_height || 720,
+            description,
+            samples: [],
+          }
+
+          // 提取所有 samples
+          mp4File.setExtractionOptions(videoTrack.id ?? 1, null, {
+            nbSamples: Infinity, // 提取所有 sample
+          })
+          mp4File.start()
+        }
+
+        mp4File.onSamples = (_trackId: number, _user: unknown, samples: Sample[]) => {
+          if (resolved) return // ✅ 防止重复 resolve
+
+          if (!meta) {
+            clearTimeout(timeout)
+            resolved = true
+            resolve(null)
+            return
+          }
+
+          // 前端切片：按 [startTime, endTime] 时间范围过滤样本
+          const timescale = meta.timescale
+          const startCts = segment.startTime * timescale
+          const endCts = segment.endTime * timescale
+
+          // 过滤出时间范围内的样本
+          let filtered = samples.filter((s) => (s?.cts ?? 0) >= startCts && (s?.cts ?? 0) < endCts)
+
+          // 确保从关键帧开始（跳过第一个 sync 之前的非关键帧）
+          let foundSync = false
+          filtered = filtered.filter((s) => {
+            if (s.is_sync) {
+              foundSync = true
+              return true
+            }
+            return foundSync
+          })
+
+          // Fallback：如果时间范围内没有样本，使用全部样本从第一个关键帧开始
+          if (filtered.length === 0) {
+            console.warn(
+              `[useCanvasPlayer] No samples in range [${segment.startTime}s, ${segment.endTime}s] for segment ${segIndex}, fallback to all from keyframe`,
+            )
+            let sync = false
+            filtered = samples.filter((s) => {
+              if (s.is_sync) {
+                sync = true
+                return true
+              }
+              return sync
+            })
+          }
+
+          meta.samples = filtered
+          console.log(
+            `[useCanvasPlayer] Segment ${segIndex}: ${filtered.length}/${samples.length} samples (range ${segment.startTime}s-${segment.endTime}s)`,
+          )
+
+          // ✅ 关键修复：等待 onSamples 完成后再返回
+          clearTimeout(timeout)
+          resolved = true
+          resolve(meta)
+        }
+
+        mp4File.onError = (_module: string, message: string) => {
+          console.error(`[useCanvasPlayer] MP4Box error: ${message}`)
+          clearTimeout(timeout)
+          resolved = true
+          resolve(null)
+        }
+
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        ;(buffer as any).fileStart = 0
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        mp4File.appendBuffer(buffer as any)
+      })
+    },
+    [segments, extractCodecDescription],
+  )
+
+  // ── 初始化 VideoDecoder 并解码指定片段 ──
+  const decodeSegment = useCallback(
+    async (_buffer: ArrayBuffer, meta: SegmentMeta): Promise<void> => {
+      if (isDestroyedRef.current) return
+
+      let decoderReady = false
+
+      // 配置解码器（每个片段可能需要不同的 codec/分辨率）
+      const decoder = new VideoDecoder({
+        output: (frame: VideoFrame) => {
+          const localTime = frame.timestamp / 1_000_000
+          const globalTime = localTime + meta.globalStartTime
+          frameQueueRef.current.push({
+            frame,
+            pts: globalTime,
+            duration: (frame.duration ?? 0) / 1_000_000,
+          })
+        },
+        error: (e: DOMException) => {
+          console.error("[useCanvasPlayer] Decoder error:", e)
+        },
+      })
+
+      console.log("[useCanvasPlayer] configure:", {
+        codec: meta.codec,
+        description: meta.description,
+        descriptionByteLength: meta.description?.byteLength,
+        videoWidth: meta.videoWidth,
+        videoHeight: meta.videoHeight,
+      })
+
+      try {
+        await decoder.configure({
+          codec: meta.codec,
+          codedWidth: meta.videoWidth,
+          codedHeight: meta.videoHeight,
+          ...(meta.description ? { description: meta.description } : {}),
+        })
+        decoderRef.current = decoder
+        decoderReady = true
+        // 标记缓冲结束，让 UI 开始渲染
+        setState((s) => ({ ...s, isBuffering: false }))
+
+        // 更新视频尺寸（用于 aspect ratio）
+        if (meta.videoWidth > 0 && meta.videoHeight > 0) {
+          videoDimRef.current = { width: meta.videoWidth, height: meta.videoHeight }
+        }
+      } catch (err) {
+        console.error("[useCanvasPlayer] Decoder configure failed for segment:", err)
+        return
+      }
+
+      if (!decoderReady) return
+
+      // 使用 demuxSegment 中已提取并过滤的 samples（前端切片）
+      const samplesCollected = meta.samples
+      console.log(
+        `[useCanvasPlayer] Segment ${meta.assetId}: ${samplesCollected.length} samples to decode`,
+      )
+      if (samplesCollected.length === 0) {
+        console.warn("[useCanvasPlayer] No samples to decode for segment", meta.assetId)
+        return
+      }
+
+      // 送入解码器
+      let decodedCount = 0
+      let skippedCount = 0
+      for (const sample of samplesCollected) {
+        if (!sample.data || isDestroyedRef.current) {
+          skippedCount++
+          continue
+        }
+        if (decoder.state === "closed") break
+
+        const chunk = new EncodedVideoChunk({
+          type: sample.is_sync ? "key" : "delta",
+          timestamp: ((sample.cts ?? 0) / (meta.timescale || 90000)) * 1_000_000,
+          duration: ((sample.duration ?? 0) / (meta.timescale || 90000)) * 1_000_000,
+          data: sample.data,
+        })
+
+        try {
+          decoder.decode(chunk)
+          decodedCount++
+        } catch (e) {
+          console.warn("[useCanvasPlayer] Decode chunk error:", e)
+        }
+      }
+      console.log(
+        `[useCanvasPlayer] Segment ${meta.assetId}: decoded ${decodedCount}, skipped ${skippedCount}, decoder.state=${decoder.state}`,
+      )
+
+      // flush 超时保护：10秒
+      try {
+        await Promise.race([
+          decoder.flush(),
+          new Promise((_, reject) =>
+            setTimeout(() => reject(new Error("flush timeout 10s")), 10_000),
+          ),
+        ])
+        console.log(`[useCanvasPlayer] Segment ${meta.assetId}: flush complete`)
+      } catch (e) {
+        console.warn("[useCanvasPlayer] Decoder flush error:", e)
+      }
+    },
+    [],
+  )
+
+  // ── 标题绘制 ──
+  const drawTitle = useCallback(
+    (
+      ctx: CanvasRenderingContext2D,
+      canvas: HTMLCanvasElement,
+      title: NonNullable<typeof titleSettings>,
+    ) => {
+      const fontSize = (title.fontSize / 720) * canvas.height
+      ctx.font = `${title.bold ? "bold" : "normal"} ${fontSize}px ${title.fontFamily}`
+      ctx.fillStyle = title.color
+      ctx.textAlign = "center"
+
+      // 按 "/" 分割为多行（"/" 作为手动换行符）
+      const lines = title.text.split(/[/／⁄∕]/)
+      console.log("[drawTitle] 原始标题:", JSON.stringify(title.text), "分割后:", lines)
+      const lineHeight = fontSize * 1.3
+      const totalHeight = lines.length * lineHeight
+
+      // 根据 position 计算第一行的 Y 坐标
+      let startY: number
+      switch (title.position) {
+        case "top":
+          startY = fontSize + canvas.height * 0.08
+          break
+        case "bottom":
+          startY = canvas.height - canvas.height * 0.08 - totalHeight + lineHeight
+          break
+        case "center":
+        default:
+          startY = (canvas.height - totalHeight) / 2 + lineHeight
+          break
+      }
+
+      if (title.shadow) {
+        ctx.shadowColor = "rgba(0,0,0,0.8)"
+        ctx.shadowBlur = 4
+        ctx.shadowOffsetX = 2
+        ctx.shadowOffsetY = 2
+      }
+
+      lines.forEach((line, idx) => {
+        const y = startY + idx * lineHeight
+        if (title.stroke) {
+          ctx.strokeStyle = "#000000"
+          ctx.lineWidth = 1
+          ctx.strokeText(line, canvas.width / 2, y)
+        }
+        ctx.fillText(line, canvas.width / 2, y)
+      })
+
+      ctx.shadowColor = "transparent"
+      ctx.shadowBlur = 0
+      ctx.shadowOffsetX = 0
+      ctx.shadowOffsetY = 0
+    },
+    [],
+  )
+
+  // ── 计算保持宽高比的绘制矩形（letterbox / pillarbox） ──
+  const computeDrawRect = useCallback(
+    (canvasW: number, canvasH: number): { dx: number; dy: number; dw: number; dh: number } => {
+      const vw = videoDimRef.current.width
+      const vh = videoDimRef.current.height
+      if (vw <= 0 || vh <= 0) return { dx: 0, dy: 0, dw: canvasW, dh: canvasH }
+
+      const canvasAspect = canvasW / canvasH
+      const videoAspect = vw / vh
+
+      let dw: number, dh: number
+      if (canvasAspect > videoAspect) {
+        // canvas 更宽 → pillarbox（左右留黑）
+        dh = canvasH
+        dw = canvasH * videoAspect
+      } else {
+        // canvas 更高 → letterbox（上下留黑）
+        dw = canvasW
+        dh = canvasW / videoAspect
+      }
+
+      return {
+        dx: (canvasW - dw) / 2,
+        dy: (canvasH - dh) / 2,
+        dw,
+        dh,
+      }
+    },
+    [],
+  )
+
+  // ── Canvas 渲染循环 ──
+  const renderFrame = useCallback(() => {
+    if (isDestroyedRef.current) return
+
+    const canvas = canvasRef.current
+    if (!canvas) return
+    const ctx = canvas.getContext("2d")
+    if (!ctx) return
+
+    const elapsed = (performance.now() - playStartRef.current) / 1000
+    const currentTime = Math.min(playStartOffsetRef.current + elapsed, totalDuration)
+
+    const frame = frameQueueRef.current.getCurrentFrame(currentTime)
+
+    ctx.clearRect(0, 0, canvas.width, canvas.height)
+
+    if (frame) {
+      const rect = computeDrawRect(canvas.width, canvas.height)
+      ctx.drawImage(frame, rect.dx, rect.dy, rect.dw, rect.dh)
+    }
+
+    if (titleSettings?.text) {
+      drawTitle(ctx, canvas, titleSettings)
+    }
+
+    // 进度更新节流到 200ms（5fps），减少 React re-render
+    const now = performance.now()
+    if (now - lastProgressUpdateRef.current >= 200) {
+      lastProgressUpdateRef.current = now
+      setState((s) => {
+        if (Math.abs(s.currentTime - currentTime) > 0.01) {
+          return { ...s, currentTime }
+        }
+        return s
+      })
+    }
+
+    if (currentTime >= totalDuration) {
+      setState((s) => ({ ...s, isPlaying: false }))
+      return
+    }
+
+    rafRef.current = requestAnimationFrame(renderFrame)
+  }, [canvasRef, totalDuration, titleSettings, drawTitle, computeDrawRect])
+
+  // ── 播放控制 ──
+  const play = useCallback(async () => {
+    if (!state.hasSupport || isDestroyedRef.current) return
+
+    setState((s) => ({ ...s, isPlaying: true }))
+    playStartRef.current = performance.now()
+    playStartOffsetRef.current = state.currentTime
+    lastProgressUpdateRef.current = 0
+    rafRef.current = requestAnimationFrame(renderFrame)
+  }, [state.hasSupport, state.currentTime, renderFrame])
+
+  const pause = useCallback(() => {
+    setState((s) => ({ ...s, isPlaying: false }))
+    cancelAnimationFrame(rafRef.current)
+  }, [])
+
+  const seek = useCallback(
+    (time: number) => {
+      const clampedTime = Math.max(0, Math.min(time, totalDuration))
+      setState((s) => ({ ...s, currentTime: clampedTime }))
+      playStartOffsetRef.current = clampedTime
+      playStartRef.current = performance.now()
+      // seek 后清空帧队列，等待新帧解码
+      frameQueueRef.current.clear()
+    },
+    [totalDuration],
+  )
+
+  const destroy = useCallback(() => {
+    isDestroyedRef.current = true
+    cancelAnimationFrame(rafRef.current)
+
+    if (decoderRef.current && decoderRef.current.state !== "closed") {
+      decoderRef.current.close()
+    }
+
+    frameQueueRef.current.clear()
+    segmentDataRef.current.clear()
+    segmentMetaRef.current = []
+  }, [])
+
+  // ── 预加载下一个片段的数据 ──
+  const preloadNext = useCallback(
+    async (currentIndex: number) => {
+      const nextIdx = currentIndex + 1
+      if (nextIdx >= segments.length) return
+      const next = segments[nextIdx]
+      if (segmentDataRef.current.has(next.assetId)) return
+      await loadSegment(next)
+    },
+    [segments, loadSegment],
+  )
+
+  // ── 初始化：加载并解码所有片段 ──
+  useEffect(() => {
+    if (!state.hasSupport || segments.length === 0) {
+      console.log("[useCanvasPlayer] Skip init:", {
+        hasSupport: state.hasSupport,
+        segmentCount: segments.length,
+      })
+      return
+    }
+
+    let cancelled = false
+    console.log("[useCanvasPlayer] Init start, segments:", segments.length)
+
+    const init = async () => {
+      setState((s) => ({ ...s, isBuffering: true }))
+
+      // 1. 加载所有片段数据
+      for (const seg of segments) {
+        await loadSegment(seg)
+        if (cancelled) {
+          console.log("[useCanvasPlayer] Cancelled during loadSegment")
+          return
+        }
+      }
+
+      // 验证 buffer 是否都已存入
+      const bufferCheck = segments.map((s) => ({
+        assetId: s.assetId,
+        hasBuffer: segmentDataRef.current.has(s.assetId),
+      }))
+      console.log("[useCanvasPlayer] Buffers loaded:", bufferCheck)
+
+      // 2. 解析每个片段的轨道元数据（await 等待 onSamples 回调完成）
+      const metas: SegmentMeta[] = []
+      for (let i = 0; i < segments.length; i++) {
+        const buffer = segmentDataRef.current.get(segments[i].assetId)
+        if (!buffer) {
+          console.warn("[useCanvasPlayer] No buffer for segment", i, segments[i].assetId)
+          continue
+        }
+        const meta = await demuxSegment(buffer, i)
+        if (cancelled) {
+          console.log("[useCanvasPlayer] Cancelled during demuxSegment")
+          return
+        }
+        if (meta) metas.push(meta)
+      }
+
+      if (cancelled || metas.length === 0) {
+        console.warn("[useCanvasPlayer] Init failed:", { cancelled, metasCount: metas.length })
+        setState((s) => ({ ...s, isBuffering: false }))
+        return
+      }
+
+      segmentMetaRef.current = metas
+
+      // 3. 设置视频尺寸（用第一个片段的尺寸）
+      if (metas[0].videoWidth > 0 && metas[0].videoHeight > 0) {
+        videoDimRef.current = { width: metas[0].videoWidth, height: metas[0].videoHeight }
+      }
+
+      // 4. 依次解码每个片段
+      for (const meta of metas) {
+        const buffer = segmentDataRef.current.get(meta.assetId)
+        if (!buffer) continue
+        await decodeSegment(buffer, meta)
+        if (cancelled) break
+      }
+
+      if (!cancelled) {
+        console.log("[useCanvasPlayer] Init complete, isReady = true")
+        setState((s) => ({ ...s, duration: totalDuration, isReady: true, isBuffering: false }))
+      }
+    }
+
+    init()
+
+    return () => {
+      cancelled = true
+      destroy()
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [segments, state.hasSupport])
+
+  return {
+    state: { ...state, duration: totalDuration },
+    controls: { play, pause, seek, destroy } satisfies CanvasPlayerControls,
+    preloadNext,
+  }
+}
+
+export default useCanvasPlayer

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

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

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

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

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

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

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

@@ -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 { createGenerationTask } from "@/api/tasks/tasks"
 import type { UseGenerateVideoProps } from "./generate-video/types"
 import { getGenerationPhase } from "./generate-video/phase"
 import { useGenerationPolling } from "./generate-video/useGenerationPolling"
@@ -55,17 +55,65 @@ 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
-      const [widthStr, heightStr] = (props.videoRatio || "1080x1920").split("x")
-      const outputWidth = parseInt(widthStr, 10) || 1080
-      const outputHeight = parseInt(heightStr, 10) || 1920
+      const ratio = props.videoRatio || "9:16"
+      let outputWidth: number
+      let outputHeight: number
 
-      await confirmGeneration(props.previewTaskId, {
+      if (ratio.includes(":")) {
+        const [rw, rh] = ratio.split(":").map(Number)
+        if (rw > 0 && rh > 0) {
+          const [longSide, shortSide] = rw < rh ? [rh, rw] : [rw, rh]
+          const baseLong = 1920
+          const baseShort = Math.round((baseLong * shortSide) / longSide)
+          const evenShort = baseShort - (baseShort % 2)
+          if (rw < rh) {
+            outputWidth = evenShort
+            outputHeight = baseLong
+          } else {
+            outputWidth = baseLong
+            outputHeight = evenShort
+          }
+        } else {
+          outputWidth = 1080
+          outputHeight = 1920
+        }
+      } else if (ratio.includes("x")) {
+        const [wStr, hStr] = ratio.split("x")
+        outputWidth = parseInt(wStr, 10) || 1080
+        outputHeight = parseInt(hStr, 10) || 1920
+      } else {
+        outputWidth = 1080
+        outputHeight = 1920
+      }
+
+      const assetIds =
+        props.materialMode === "auto" ? props.smartSelectedIds : props.selectedMaterials
+
+      // 直接创建正式生成任务
+      await createGenerationTask({
+        template_id: selectedTemplate,
+        asset_ids: assetIds,
         output_width: outputWidth,
         output_height: outputHeight,
-        cover_url: props.coverSettings.upload_url || "",
-        custom_title: props.titleSettings.title || "",
+        cover_url: props.coverSettings?.upload_url || "",
+        custom_title: props.titleSettings?.title || "",
+        duration: props.duration || undefined,
+        video_ratio: props.videoRatio,
+        ...(props.titleSettings?.title
+          ? {
+              title_config: {
+                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,
+              },
+            }
+          : {}),
       })
 
       startPolling()
@@ -78,7 +126,7 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
       setGenerateError(finalMsg)
       message.error(finalMsg)
     }
-  }, [props, selectedTemplate, 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 +1,114 @@
+/**
+ * 预览素材加载 Hook
+ * 根据选中的素材 ID 列表，逐个获取素材详情（含 file_url、duration 等）
+ * 供前端预览播放器使用
+ *
+ * 注意：后端没有批量接口（/assets/batch 返回 405），
+ * 因此直接使用 Promise.allSettled 并发请求单个 GET /assets/{id}
+ */
+import { useState, useEffect, useCallback, useRef } from "react"
+import type { AssetItem } from "@/api/assets"
+import type { AxiosResponse } from "axios"
+
+/**
+ * 通过 ID 列表逐个获取素材（并发）
+ * 使用 Promise.allSettled 确保单个失败不影响整体
+ */
+async function fetchAssetsByIds(ids: string[]): Promise<AssetItem[]> {
+  if (!ids.length) return []
+
+  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 +1,362 @@
+/**
+ * 素材片段调度器 Hook（多 video 元素方案 v2）
+ * 每个片段对应一个独立 <video> 元素，全部预加载，通过 display 切换实现无缝播放
+ * 替代单 video + 切 src 方案，消除片段切换延迟
+ */
+import { 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 */
+  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
+  /** 每个片段对应的 video 元素 ref 数组 */
+  videoRefs: React.MutableRefObject<(HTMLVideoElement | null)[]>
+}
+
+/**
+ * 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 — 多 video 元素版素材片段调度器
+ *
+ * 核心改变：
+ * - 每个片段对应一个独立 <video> 元素（由组件渲染，ref 传入）
+ * - 所有 video 在挂载时即设置 src + preload="auto"，浏览器自动预加载
+ * - 切换片段仅改 currentSegmentIndex + display，无需重新 load
+ * - 实现无缝切换，无加载延迟
+ */
+export function useSegmentScheduler(segments: PlaybackSegment[]): SegmentSchedulerState {
+  /** 每个片段对应的 video 元素 ref（由组件 JSX 渲染并绑定） */
+  const videoRefs = useRef<(HTMLVideoElement | 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)
+
+  // 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
+   * 不改变 src（video 已在 JSX 中设置），仅 seek + 等待可播
+   */
+  const switchToSegment = useCallback(
+    (index: number, seekToLocalTime?: number): Promise<void> => {
+      return new Promise((resolve) => {
+        // 暂停当前视频
+        const prevVideo = videoRefs.current[currentSegmentIndex]
+        if (prevVideo) prevVideo.pause()
+
+        const video = videoRefs.current[index]
+        if (!video || index >= segments.length) {
+          resolve()
+          return
+        }
+
+        const seg = segments[index]
+        const localTime = seekToLocalTime ?? seg.startTime
+
+        // 设置播放位置
+        video.currentTime = localTime
+
+        // 如果已有足够帧数据，直接 resolve
+        if (video.readyState >= 2) {
+          setCurrentSegmentIndex(index)
+          resolve()
+          return
+        }
+
+        // 等待 canplay 事件
+        const onCanPlay = () => {
+          video.removeEventListener("canplay", onCanPlay)
+          clearTimeout(timeoutId)
+          setCurrentSegmentIndex(index)
+          resolve()
+        }
+
+        // 10 秒超时保护
+        const timeoutId = setTimeout(() => {
+          video.removeEventListener("canplay", onCanPlay)
+          console.warn(
+            `[useSegmentScheduler] 片段 ${index} 预加载超时 (10s), readyState=${video.readyState}`,
+          )
+          setCurrentSegmentIndex(index)
+          resolve()
+        }, 10000)
+
+        video.addEventListener("canplay", onCanPlay)
+      })
+    },
+    [segments, currentSegmentIndex],
+  )
+
+  /** 播放循环 — 检测片段边界并切换 */
+  const tick = useCallback(() => {
+    const video = videoRefs.current[currentSegmentIndex]
+    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) {
+      video.pause()
+      const nextIndex = currentSegmentIndex + 1
+      if (nextIndex < segments.length) {
+        switchToSegment(nextIndex).then(() => {
+          setIsPlaying(true)
+          rafRef.current = requestAnimationFrame(tick)
+          const nextVideo = videoRefs.current[nextIndex]
+          if (nextVideo) {
+            const canPlay = () => {
+              nextVideo
+                .play()
+                .catch((e) =>
+                  console.warn("[useSegmentScheduler] auto-play next segment failed:", e),
+                )
+            }
+            if (nextVideo.readyState >= 3) {
+              canPlay()
+            } else {
+              const timeout = setTimeout(canPlay, 300)
+              nextVideo.addEventListener(
+                "canplay",
+                () => {
+                  clearTimeout(timeout)
+                  canPlay()
+                },
+                { once: true },
+              )
+            }
+          }
+        })
+        const accumulatedTime =
+          (timelineStarts[currentSegmentIndex] || 0) + (seg.endTime - seg.startTime)
+        setCurrentTime(accumulatedTime)
+      } else {
+        setIsPlaying(false)
+        setIsEnded(true)
+        setCurrentTime(totalDuration)
+        return
+      }
+    } else {
+      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 () => {
+    if (!canPlay) return
+
+    setIsEnded(false)
+
+    // 确保第一段可播放
+    const firstVideo = videoRefs.current[0]
+    if (firstVideo && currentSegmentIndex === 0 && firstVideo.readyState < 2) {
+      await switchToSegment(0)
+    }
+
+    const video = videoRefs.current[currentSegmentIndex]
+    if (!video) return
+
+    try {
+      const playPromise = video.play()
+      if (playPromise !== undefined) {
+        await playPromise
+      }
+      setIsPlaying(true)
+      rafRef.current = requestAnimationFrame(tick)
+    } catch (err) {
+      console.warn("[useSegmentScheduler] 播放失败:", err)
+    }
+  }, [canPlay, switchToSegment, tick, currentSegmentIndex])
+
+  /** 暂停 */
+  const pause = useCallback(() => {
+    const video = videoRefs.current[currentSegmentIndex]
+    if (video) video.pause()
+    setIsPlaying(false)
+    cancelAnimationFrame(rafRef.current)
+  }, [currentSegmentIndex])
+
+  /** 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).then(() => {
+          const video = videoRefs.current[0]
+          if (video) {
+            video.play().catch((e) => console.warn("[useSegmentScheduler] restart play failed:", e))
+            setIsPlaying(true)
+            setCurrentTime(0)
+            rafRef.current = requestAnimationFrame(tick)
+          }
+        })
+      } else {
+        play()
+      }
+    }
+  }, [isPlaying, isEnded, pause, play, switchToSegment, segments, tick])
+
+  /** 跳转到指定全局时间 */
+  const seekTo = useCallback(
+    async (time: number) => {
+      if (!canPlay) return
+
+      const clampedTime = Math.max(0, Math.min(time, totalDuration))
+      const { index, localTime } = findSegmentAtTime(segments, clampedTime)
+
+      isSeekingRef.current = true
+
+      if (index !== currentSegmentIndex) {
+        await switchToSegment(index, localTime)
+      } else {
+        const video = videoRefs.current[index]
+        if (video) video.currentTime = localTime
+      }
+
+      setCurrentTime(clampedTime)
+      setIsEnded(false)
+
+      setTimeout(() => {
+        isSeekingRef.current = false
+      }, 200)
+    },
+    [canPlay, totalDuration, segments, currentSegmentIndex, switchToSegment],
+  )
+
+  // 确保 videoRefs 数组长度与 segments 一致 + 强制预加载
+  useEffect(() => {
+    videoRefs.current = videoRefs.current.slice(0, segments.length)
+    while (videoRefs.current.length < segments.length) {
+      videoRefs.current.push(null)
+    }
+    // 强制预加载：所有 video 元素挂载后，调用 load() 确保浏览器真正开始加载数据
+    videoRefs.current.forEach((video) => {
+      if (video) {
+        video.load()
+      }
+    })
+  }, [segments])
+
+  // 组件卸载时清理
+  useEffect(() => {
+    return () => {
+      cancelAnimationFrame(rafRef.current)
+    }
+  }, [])
+
+  // 片段列表变化时重置
+  useEffect(() => {
+    cancelAnimationFrame(rafRef.current)
+    setIsPlaying(false)
+    setCurrentTime(0)
+    setCurrentSegmentIndex(0)
+    setIsEnded(false)
+  }, [segments])
+
+  return {
+    isPlaying,
+    currentTime,
+    totalDuration,
+    currentSegmentIndex,
+    segmentLocalTime,
+    isEnded,
+    canPlay,
+    play,
+    pause,
+    togglePlayPause,
+    seekTo,
+    videoRefs,
+  }
+}
+
+export default useSegmentScheduler

apps/web/src/pages/generate/hooks/useStep4Preview.ts

@@ -1,440 +0,0 @@
-/**
- * Step 4 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 type { PreviewTaskResponse, PreviewStatus as ApiPreviewStatus } from "@/api/generation"
-import type { EditingTemplate } from "@/api/editing-planner"
-import { safeExtractError } from "./generate-video/errorUtils"
-
-/** 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 UseStep4PreviewProps {
-  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
-}
-
-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 useStep4Preview({
-  templates,
-  selectedTemplate,
-  materialMode,
-  selectedMaterials,
-  smartSelectedIds,
-  duration,
-  videoRatio,
-  voiceIds,
-  voiceLibraryId,
-  previewCount = 1,
-}: UseStep4PreviewProps) {
-  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(","),
-  })
-
-  useEffect(() => {
-    const currentKey = [
-      selectedTemplate,
-      materialMode,
-      [...selectedMaterials].sort().join(","),
-      [...smartSelectedIds].sort().join(","),
-      duration,
-      videoRatio,
-      [...(voiceIds || [])].sort().join(","),
-    ].join("|")
-
-    const prevKey = [
-      prevDepsRef.current.selectedTemplate,
-      prevDepsRef.current.materialMode,
-      prevDepsRef.current.selectedMaterials,
-      prevDepsRef.current.smartSelectedIds,
-      prevDepsRef.current.duration,
-      prevDepsRef.current.videoRatio,
-      prevDepsRef.current.voiceIds,
-    ].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(","),
-    }
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [
-    selectedTemplate,
-    materialMode,
-    selectedMaterials,
-    smartSelectedIds,
-    duration,
-    videoRatio,
-    voiceIds,
-    previewCount,
-  ])
-
-  // 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,
-            ),
-          )
-          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))
-  }, [])
-
-  /** 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,
-        })
-
-        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,
-    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 useStep4Preview

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

@@ -2,10 +2,11 @@
  * Step 6 封面设置 Hook
  * 封装封面设置的交互逻辑，对接后端封面模板 CRUD API
  */
-import { useCallback, useEffect, useRef, useState } from "react"
+import { useCallback, useEffect, useState } from "react"
 import { message } from "antd"
-import type { CoverConfig, CoverTemplate } from "../../editing-planner/types"
-import { generateCover } from "@/api/template-editor"
+import type { CoverConfig, CoverTemplate } from "../types/cover"
+import { generateCover } from "@/api/generation"
+import { createPreview, getPreviewStatus } from "@/api/generation/preview"
 import {
   fetchCoverTemplates,
   createCoverTemplate,
@@ -30,7 +31,7 @@ export function useStep6Cover({
   assetIds = [],
   selectedTemplate = "",
 }: UseStep6CoverProps) {
-  const generatingRef = useRef(false)
+  const [generating, setGenerating] = useState(false)
 
   // ── 封面设置弹窗状态 ──
   const [showCoverSettings, setShowCoverSettings] = useState(false)
@@ -67,7 +68,7 @@ export function useStep6Cover({
 
   /** 调用后端智能封面 API，生成封面并更新预览 */
   const generateAutoCover = useCallback(async () => {
-    if (generatingRef.current) {
+    if (generating) {
       message.warning("封面正在生成中，请稍候...")
       return
     }
@@ -82,12 +83,17 @@ export function useStep6Cover({
       return
     }
 
-    generatingRef.current = true
+    setGenerating(true)
+    // 超时保护：300 秒后强制重置，防止 state 卡死导致按钮永久失效
+    const timeoutId = setTimeout(() => {
+      setGenerating(false)
+    }, 300000)
     try {
       const response = await generateCover(selectedTemplate, {
         asset_ids: assetIds,
         cover_type: "ai_frame",
       })
+      clearTimeout(timeoutId)
       const thumbnailUrl = response.cover?.image_url || ""
       if (thumbnailUrl) {
         onCoverSettingsChange({
@@ -100,12 +106,89 @@ export function useStep6Cover({
         message.warning("封面生成未返回图片，请重试")
       }
     } catch (err) {
-      console.warn("[Step6] 智能封面生成失败:", err)
-      message.error("封面生成失败，请稍后重试")
+      clearTimeout(timeoutId)
+      console.error("[Step6] 智能封面生成失败:", err)
+
+      // 提取详细错误信息
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const anyErr = err as any
+      const statusCode = anyErr?.response?.status
+
+      // 400 错误：后端缺少预览视频，自动创建后重试
+      if (statusCode === 400) {
+        console.log("[Step6] 后端返回 400，尝试自动创建预览渲染任务...")
+        message.info("正在准备预览视频，请稍候...")
+        try {
+          const previewResp = await createPreview({
+            template_id: selectedTemplate,
+            asset_ids: assetIds,
+            duration: duration || 30,
+          })
+          // 轮询等待预览渲染完成
+          await new Promise<void>((resolve, reject) => {
+            const poll = setInterval(async () => {
+              try {
+                const status = await getPreviewStatus(previewResp.task_id)
+                if (status.status === "completed") {
+                  clearInterval(poll)
+                  resolve()
+                } else if (status.status === "failed") {
+                  clearInterval(poll)
+                  reject(new Error(status.error_message || "预览渲染失败"))
+                }
+              } catch (e) {
+                clearInterval(poll)
+                reject(e)
+              }
+            }, 3000)
+          })
+          message.success("预览视频就绪，重新生成封面...")
+          // 重试封面生成
+          const retryResp = await generateCover(selectedTemplate, {
+            asset_ids: assetIds,
+            cover_type: "ai_frame",
+          })
+          const retryUrl = retryResp.cover?.image_url || ""
+          if (retryUrl) {
+            onCoverSettingsChange({
+              ...coverSettings,
+              thumbnail_url: retryUrl,
+              ai_suggested_time: retryResp.cover?.frame_time ?? null,
+            })
+            message.success("封面生成成功")
+          } else {
+            message.warning("封面生成未返回图片，请重试")
+          }
+        } catch (retryErr) {
+          console.error("[Step6] 自动创建预览后重试失败:", retryErr)
+          message.error("预览视频创建失败，请稍后重试")
+        }
+      } else 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)
+      }
     } finally {
-      generatingRef.current = false
+      clearTimeout(timeoutId)
+      setGenerating(false)
     }
-  }, [selectedTemplate, assetIds, coverSettings, onCoverSettingsChange])
+  }, [selectedTemplate, assetIds, coverSettings, onCoverSettingsChange, generating, duration])
 
   // ── 模板操作方法 ──
   const handleSelectTemplate = useCallback((id: string) => {
@@ -165,6 +248,7 @@ export function useStep6Cover({
 
   return {
     coverSettings,
+    generating,
     generateAutoCover,
     totalDuration,
     showCoverSettings,

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

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

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

@@ -1,7 +1,9 @@
 /**
  * GeneratePage 步骤导航
  * 管理步骤切换与各步骤的前置校验
- * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 预览(4) → 标题(5) → 封面(6) → 确认(7)
+ * 步骤顺序：模板(1) → 素材(2) → 配音(3) → 标题(4) → 预览(5) → 封面(6) → 确认(7)
+ *
+ * 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
 }
 
@@ -49,12 +51,12 @@ export const useStepNavigation = (options: UseStepNavigationOptions): UseStepNav
       return
     }
     // Step3 配音：配音为可选项，不强制校验，用户可跳过
-    if (currentStep === 4 && !previewReady) {
-      message.warning("请先生成剪辑预览")
+    if (currentStep === 4 && !titleSettings.title.trim()) {
+      message.warning("请选择或输入标题")
       return
     }
-    if (currentStep === 5 && !titleSettings.title.trim()) {
-      message.warning("请选择或输入标题")
+    if (currentStep === 5 && !previewReady) {
+      message.warning("请先选择素材以预览效果")
       return
     }
     if (currentStep < 7) {

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

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

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

@@ -0,0 +1,54 @@
+/**
+ * 共享：根据素材列表和模板片段计算总视频时长
+ * GeneratePage（配音校验）和 FrontendPreviewPlayer（播放控制）共用
+ */
+
+export interface DurationAsset {
+  id?: string
+  duration?: number
+  metadata?: { duration?: number }
+}
+
+export interface DurationTemplateSegment {
+  duration_min?: number
+  duration_max?: number
+}
+
+/**
+ * 计算总视频时长
+ * @param assets 素材列表
+ * @param template 模板（含 segments）
+ * @returns 总时长（秒），无有效数据时返回 0
+ */
+export function calculateTotalVideoDuration(
+  assets: DurationAsset[] | undefined,
+  template: { segments?: DurationTemplateSegment[] } | undefined,
+): number {
+  if (!assets || assets.length === 0 || !template) return 0
+
+  const templateSegments = template.segments || []
+
+  return assets.reduce((sum, asset, i) => {
+    const assetDuration = asset.duration || asset.metadata?.duration || 30
+    const tplSeg = templateSegments[i] || templateSegments[templateSegments.length - 1]
+    const segDuration = tplSeg
+      ? Math.min(
+          tplSeg.duration_max ?? assetDuration,
+          Math.max(tplSeg.duration_min ?? 0, assetDuration),
+        )
+      : Math.min(assetDuration, 10)
+    return sum + segDuration
+  }, 0)
+}
+
+/**
+ * 估算总视频时长（仅依赖模板 segments）
+ * 当素材未加载或加载失败时，用各片段 duration_max 之和作为估算值
+ * 确保配音时长校验不会因素材未就绪而跳过
+ */
+export function estimateTotalVideoDuration(
+  template: { segments?: DurationTemplateSegment[] } | undefined,
+): number {
+  if (!template?.segments || template.segments.length === 0) return 0
+  return template.segments.reduce((sum, seg) => sum + (seg.duration_max || 0), 0)
+}

apps/web/src/test/api/client.test.ts

@@ -20,9 +20,16 @@ vi.mock("@/api/auth", () => ({
   refreshAccessToken: vi.fn(),
 }))
 
+vi.mock("@/api/auth/tokenRefresh", () => ({
+  scheduleProactiveRefresh: vi.fn(),
+  cancelProactiveRefresh: vi.fn(),
+  executeTokenRefresh: vi.fn(),
+}))
+
 import { message } from "antd"
 import { useAuthStore } from "@/store/authStore"
 import { refreshAccessToken } from "@/api/auth"
+import { executeTokenRefresh } from "@/api/auth/tokenRefresh"
 import apiClient from "@/api/client"
 
 // 从真实实例取出拦截器回调
@@ -264,23 +271,28 @@ describe("apiClient - 401 token refresh", () => {
     expect(window.location.href).toBe("/")
   })
 
-  it("refreshes token on 401 and calls setAuth", async () => {
+  it("refreshes token on 401 and calls executeTokenRefresh", async () => {
     const mockSetAuth = vi.fn()
-    vi.mocked(useAuthStore.getState).mockReturnValue({
+    let currentAccessToken = "old-access"
+    vi.mocked(useAuthStore.getState).mockImplementation(() => ({
       user: { id: "1", email: "test@test.com" },
-      accessToken: "old-access",
+      accessToken: currentAccessToken,
       refreshToken: "old-refresh",
       isAuthenticated: true,
       clearAuth: vi.fn(),
-      setAuth: mockSetAuth,
-    } as any)
-    vi.mocked(refreshAccessToken).mockResolvedValue({
-      access_token: "new-access",
-      refresh_token: "new-refresh",
-    } as never)
+      setAuth: ((_user: any, newAccess: string, _newRefresh: string) => {
+        currentAccessToken = newAccess
+        mockSetAuth(_user, newAccess, _newRefresh)
+      }) as any,
+    }))
+
+    // Mock executeTokenRefresh to simulate successful refresh
+    vi.mocked(executeTokenRefresh).mockImplementation(() => {
+      currentAccessToken = "new-access"
+      mockSetAuth({ id: "1", email: "test@test.com" }, "new-access", "new-refresh")
+      return Promise.resolve()
+    })
 
-    // 拦截器重试时会调用 apiClient(config)，会真的发请求，最终会 reject
-    // 但我们只关心刷新逻辑是否正确执行
     const err = makeAxiosError(401, { detail: "Unauthorized" })
 
     try {
@@ -289,31 +301,45 @@ describe("apiClient - 401 token refresh", () => {
       // 重试会因为没有真实网络而失败，忽略
     }
 
-    expect(refreshAccessToken).toHaveBeenCalledWith("old-refresh")
+    expect(executeTokenRefresh).toHaveBeenCalled()
     expect(mockSetAuth).toHaveBeenCalled()
   })
 
   it("handles refresh failure by logging out", async () => {
     const mockClearAuth = vi.fn()
-    vi.mocked(useAuthStore.getState).mockReturnValue({
+    // After executeTokenRefresh fails, it clears auth (sets accessToken to null)
+    // and redirects to /login. The promise resolves (doesn't reject).
+    let currentAccessToken: string | null = "old-access"
+    vi.mocked(useAuthStore.getState).mockImplementation(() => ({
       user: { id: "1", email: "test@test.com" },
-      accessToken: "old-access",
+      accessToken: currentAccessToken,
       refreshToken: "old-refresh",
-      isAuthenticated: true,
-      clearAuth: mockClearAuth,
+      isAuthenticated: currentAccessToken !== null,
+      clearAuth: (() => {
+        currentAccessToken = null
+        mockClearAuth()
+        window.location.href = "/login"
+      }) as any,
       setAuth: vi.fn(),
-    } as any)
-    vi.mocked(refreshAccessToken).mockRejectedValue(new Error("refresh failed") as never)
+    }))
+    // Mock executeTokenRefresh: simulates failure → clears auth + redirects
+    vi.mocked(executeTokenRefresh).mockImplementation(() => {
+      currentAccessToken = null
+      mockClearAuth()
+      window.location.href = "/login"
+      return Promise.resolve()
+    })
 
     const err = makeAxiosError(401, { detail: "Unauthorized" })
 
     try {
       await responseErrorInterceptor(err)
     } catch {
-      // expected
+      // expected - rejects because accessToken is null after failed refresh
     }
 
+    expect(executeTokenRefresh).toHaveBeenCalled()
     expect(mockClearAuth).toHaveBeenCalled()
-    expect(window.location.href).toBe("/")
+    expect(window.location.href).toBe("/login")
   })
 })

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

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

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

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

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

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

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

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

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

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

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

@@ -17,7 +17,7 @@ import "@/api/generation/types"
 // 直接引入所有 Step 组件，建立完整依赖链
 import "@/pages/generate/GeneratePage"
 import "@/pages/generate/components/Step2MaterialSelect"
-import "@/pages/generate/components/Step4GeneratePreview"
+import "@/pages/generate/components/Step5GeneratePreview"
 import "@/pages/generate/components/Step4TitleSettings"
 import "@/pages/generate/components/Step5VoiceSelect"
 import "@/pages/generate/components/PreviewVideoPanel"
@@ -47,7 +47,8 @@ describe("GeneratePage module smoke test", () => {
   })
 })
 import "@/pages/generate/hooks/useGenerateVideo"
-import "@/pages/generate/hooks/useStep4Preview"
+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/step4-preview.smoke.test.tsx

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

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

@@ -0,0 +1,19 @@
+/**
+ * Step5GeneratePreview smoke test
+ * 确保 vitest related 模式能匹配到第5步预览生成相关文件的改动
+ */
+import { describe, it, expect } from "vitest"
+
+import "@/pages/generate/components/Step5GeneratePreview"
+import "@/pages/generate/hooks/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"
+
+describe("Step5GeneratePreview module smoke test", () => {
+  it("should load all step5 preview modules", () => {
+    expect(true).toBe(true)
+  })
+})

apps/worker/video_processing/cover_generator.py

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

apps/worker/video_processing/dedup_helpers.py

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

apps/worker/video_processing/render_adapter.py

@@ -47,7 +47,14 @@ def _parse_resolution(resolution_str: str | None) -> tuple[int, int]:
         w, h = resolution_str.lower().split("x", 1)
         width = int(w.strip())
         height = int(h.strip())
-        if width <= 0 or height <= 0:
+        # 最小 100px 防护：避免前端传入宽高比（如 "9:16"）被 parseInt 截断为极小值
+        if width < 100 or height < 100:
+            logger.warning(
+                "分辨率异常小 (%dx%d)，使用默认值。原始值: %s",
+                width,
+                height,
+                resolution_str,
+            )
             return DEFAULT_OUTPUT_WIDTH, DEFAULT_OUTPUT_HEIGHT
         return width, height
     except (ValueError, TypeError):
@@ -74,6 +81,9 @@ class RenderAdapterResult:
     failed_clip_ids: list[str] = None  # 失败的 clip id 列表
     error_message: str = ""
     error_detail: str = ""  # 详细错误信息（如 ffmpeg stderr），用于排查
+    cover_candidates: list[dict] | None = (
+        None  # 封面候选帧 [{"image_url": "...", "frame_time": 5.0, "storage_key": "..."}]
+    )
 
     def __post_init__(self):
         if self.rendered_clip_ids is None:
@@ -509,6 +519,8 @@ class RenderAdapter:
 
         # 3. 读取输出分辨率
         export_config = plan_config.get("export", {}) or {}
+        if not isinstance(export_config, dict):
+            export_config = {}
         output_width, output_height = _parse_resolution(export_config.get("resolution"))
         logger.info(
             "渲染输出分辨率: plan_id=%s resolution=%dx%d source=%s",
@@ -568,6 +580,33 @@ class RenderAdapter:
                 thumb_err,
             )
 
+        # 7. 抽取封面候选帧并上传 OSS（失败不阻断主流程）
+        cover_candidates = None
+        try:
+            from video_processing.thumbnail_generator import extract_and_upload_cover_frames
+
+            # 从 plan config 提取标题文字，叠加到封面候选帧上
+            _title_cfg = (plan_config or {}).get("title", {}) or {}
+            if not isinstance(_title_cfg, dict):
+                _title_cfg = {}
+            _title_text = (_title_cfg.get("text", "") or "").strip() if _title_cfg.get("enabled", True) else ""
+
+            cover_candidates = extract_and_upload_cover_frames(
+                str(result.output_path), plan_id, num_frames=3, title_text=_title_text
+            )
+            if cover_candidates:
+                logger.info(
+                    "[render-adapter] 封面候选帧生成成功: plan_id=%s count=%d",
+                    plan_id,
+                    len(cover_candidates),
+                )
+        except Exception as cover_err:
+            logger.warning(
+                "[render-adapter] 封面候选帧生成失败（不影响主流程）: plan_id=%s error=%s",
+                plan_id,
+                cover_err,
+            )
+
         self._report_progress(progress_cb, 100.0, "渲染完成")
 
         logger.info(
@@ -599,6 +638,7 @@ class RenderAdapter:
             clip_count=len(clips),
             rendered_clip_ids=final_rendered_ids,
             failed_clip_ids=final_failed_ids,
+            cover_candidates=cover_candidates,
         )
 
     def render_from_memory(

apps/worker/video_processing/render_audio.py

@@ -131,7 +131,7 @@ def mix_audio(
 
     if not main_clips and not audio_clips:
         # 没有主音频也没有独立音频 → 检查是否有 BGM
-        if bgm_path and bgm_config and bgm_config.get("enabled", False):
+        if bgm_path and bgm_config and isinstance(bgm_config, dict) and bgm_config.get("enabled", False):
             from video_processing.bgm_mixer import BGMConfig, build_bgm_only
 
             bgm_cfg = BGMConfig.from_config_dict(bgm_path, bgm_config)
@@ -161,7 +161,7 @@ def mix_audio(
         mix_with_independent_audio(ctx, effective_main, effective_audio, output_path, video_duration)
 
     # ── BGM 混音 ──
-    if bgm_path and bgm_config and bgm_config.get("enabled", False):
+    if bgm_path and bgm_config and isinstance(bgm_config, dict) and bgm_config.get("enabled", False):
         from video_processing.bgm_mixer import BGMConfig, mix_bgm_with_main
 
         bgm_cfg = BGMConfig.from_config_dict(bgm_path, bgm_config)
@@ -174,7 +174,7 @@ def mix_audio(
             logger.exception("[bgm] BGM 混音失败，回退到无 BGM 音频: plan_id=%s", ctx.plan_id)
 
     # ── 多轨道混音（配音/音效等） ──
-    if audio_tracks_config and audio_tracks_config.get("enabled", False):
+    if audio_tracks_config and isinstance(audio_tracks_config, dict) and audio_tracks_config.get("enabled", False):
         from video_processing.multi_track_mixer import mix_audio_tracks_from_config
 
         try:

apps/worker/video_processing/reverse_engine.py

@@ -33,7 +33,7 @@ class ReverseConfig:
     @classmethod
     def from_dict(cls, data: dict[str, Any] | None) -> "ReverseConfig":
         """从字典解析配置."""
-        if not data:
+        if not isinstance(data, dict):
             return cls(enabled=False)
         try:
             if not data.get("enabled", False):

apps/worker/video_processing/subtitle_generator.py

@@ -13,6 +13,16 @@ import logging
 from pathlib import Path
 from typing import Any
 
+from packages.domain.ass_subtitle_builder import (
+    TITLE_MARGIN_SIDE,
+    TITLE_MARGIN_TOP,
+    _wrap_title_text,
+    build_ass_style,
+    escape_ass_text,
+    format_ass_time,
+    hex_to_ass_color,
+    position_to_ass_alignment,
+)
 from packages.domain.subtitle import SubtitleTimeline
 
 logger = logging.getLogger(__name__)
@@ -100,7 +110,10 @@ def generate_ass_from_timeline(
     *,
     video_width: int,
     video_height: int,
+    video_duration: float = 0.0,
     subtitle_config: dict[str, Any] | None = None,
+    title_text: str = "",
+    title_config: dict[str, Any] | None = None,
 ) -> Path:
     """从字幕时间轴生成 ASS 字幕文件。
 
@@ -160,7 +173,76 @@ def generate_ass_from_timeline(
 
         events.append(f"Dialogue: 0,{start_time},{end_time},Default,,0,0,0,,{safe_text}")
 
-    # 组装 ASS 文件
+    # ── 标题样式与事件（叠加在 ASR 字幕之上）───────────────────────────
+    title_cfg = title_config or {}
+    if not isinstance(title_cfg, dict):
+        title_cfg = {}
+    title_enabled = title_cfg.get("enabled", True) and bool(title_text.strip())
+
+    title_style_line = ""
+    title_event_line = ""
+
+    if title_enabled:
+        # 兼容 boolean stroke/shadow → dict
+        _stroke_val = title_cfg.get("stroke")
+        if isinstance(_stroke_val, bool):
+            title_cfg["stroke"] = (
+                {"enabled": _stroke_val, "color": "#000000", "width": 2} if _stroke_val else {"enabled": False}
+            )
+        _shadow_val = title_cfg.get("shadow")
+        if isinstance(_shadow_val, bool):
+            title_cfg["shadow"] = (
+                {"enabled": _shadow_val, "color": "#000000", "blur": 4, "offset_x": 2, "offset_y": 2}
+                if _shadow_val
+                else {"enabled": False}
+            )
+
+        # 字段名归一化: font_size→size, font_color→color
+        if "font_size" in title_cfg and "size" not in title_cfg:
+            title_cfg["size"] = title_cfg["font_size"]
+        if "font_color" in title_cfg and "color" not in title_cfg:
+            title_cfg["color"] = title_cfg["font_color"]
+
+        t_color = hex_to_ass_color(title_cfg.get("color", "#ffffff"))
+        t_stroke = title_cfg.get("stroke", {}) or {}
+        t_shadow = title_cfg.get("shadow", {}) or {}
+        s_color = hex_to_ass_color(t_stroke.get("color", "#000000"))
+        s_width = float(t_stroke.get("width", 2)) if t_stroke.get("enabled", False) else 0.0
+        sh_blur = float(t_shadow.get("blur", 4)) if t_shadow.get("enabled", False) else 0.0
+        sh_offset = (
+            t_shadow.get("offset_x", 2) if t_shadow.get("enabled", False) else 0,
+            t_shadow.get("offset_y", 2) if t_shadow.get("enabled", False) else 0,
+        )
+        t_alignment = position_to_ass_alignment(title_cfg.get("position", "top"))
+
+        title_style_line = build_ass_style(
+            "TitleStyle",
+            font_name=title_cfg.get("font", "思源黑体"),
+            font_size=min(int(title_cfg.get("size", 36)), 36),
+            primary_color=t_color,
+            outline_color=s_color,
+            outline_width=s_width,
+            shadow_blur=sh_blur,
+            shadow_offset=sh_offset,
+            bold=bool(title_cfg.get("bold", True)),
+            italic=bool(title_cfg.get("italic", False)),
+            alignment=t_alignment,
+            margin_v=TITLE_MARGIN_TOP,
+            margin_l=TITLE_MARGIN_SIDE,
+            margin_r=TITLE_MARGIN_SIDE,
+        )
+
+        t_font_size = min(int(title_cfg.get("size", 36)), 36)
+        safe_raw = escape_ass_text(title_text.strip())
+        safe_wrapped = _wrap_title_text(safe_raw, video_width, t_font_size)
+
+        if video_duration > 0:
+            t_end_time = format_ass_time(video_duration)
+        else:
+            t_end_time = format_ass_time((timeline.segments[-1].end + 5.0) if timeline.segments else 60.0)
+        title_event_line = f"Dialogue: 0,0:00:00.00,{t_end_time},TitleStyle,,0,0,0,,{safe_wrapped}"
+
+        # 组装 ASS 文件
     ass_content = f"""[Script Info]
 ScriptType: v4.00+
 PlayResX: {video_width}
@@ -170,12 +252,12 @@ WrapStyle: 2
 Encoding: UTF-8
 
 [V4+ Styles]
-Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
-{style_line}
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding  # noqa: E501
+{chr(10).join(filter(None, [title_style_line, style_line]))}
 
 [Events]
 Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
-{chr(10).join(events)}
+{chr(10).join(filter(None, [title_event_line] + events))}
 """
 
     output_path.parent.mkdir(parents=True, exist_ok=True)

apps/worker/video_processing/thumbnail_generator.py

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

apps/worker/video_processing/unified_render_service.py

@@ -324,6 +324,8 @@ class UnifiedRenderService:
         else:
             config = self.plan.config or {}
             bgm_config = config.get("bgm", {}) or {}
+            if not isinstance(bgm_config, dict):
+                bgm_config = {}
             audio_tracks_config = config.get("audio_tracks") or {}
             noise_reduction_config = config.get("audio_noise_reduction")
             ctx = RenderContext(
@@ -480,7 +482,11 @@ class UnifiedRenderService:
         """
         config = self.plan.config or {}
         title_cfg = config.get("title", {}) or {}
+        if not isinstance(title_cfg, dict):
+            title_cfg = {}
         subtitle_cfg = config.get("subtitle", {}) or {}
+        if not isinstance(subtitle_cfg, dict):
+            subtitle_cfg = {}
 
         title_enabled = title_cfg.get("enabled", True)
         subtitle_enabled = subtitle_cfg.get("enabled", True)
@@ -507,7 +513,10 @@ class UnifiedRenderService:
                         timeline,
                         video_width=self.output_width,
                         video_height=self.output_height,
+                        video_duration=video_duration,
                         subtitle_config=subtitle_cfg,
+                        title_text=title_text,
+                        title_config=title_cfg,
                     )
                     logger.info(
                         "ASR自动字幕生成完成: plan_id=%s segments=%d duration=%.1fs",
@@ -653,7 +662,11 @@ class UnifiedRenderService:
         """
         config = self.plan.config or {}
         tts_cfg = config.get("tts", {}) or {}
+        if not isinstance(tts_cfg, dict):
+            tts_cfg = {}
         subtitle_cfg = config.get("subtitle", {}) or {}
+        if not isinstance(subtitle_cfg, dict):
+            subtitle_cfg = {}
         use_subtitle_align = False  # 是否使用字幕对齐模式
 
         # 兼容前端顶层字段：voice_id / custom_text / voice_clone_profile_id

apps/worker/worker_app/tasks/compose_video.py

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