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xiaoxia-saas/apps/api/app
saas-backend-agent d6a2715a26
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feat: 封面智能选帧 — 帧质量评分(清晰度/亮度/色彩)
P1-后端2:封面智能选帧

新增 cover_frame_scorer.py:
- score_frame(): 评估单帧质量 0~100 分
  - 清晰度 (0~40): 拉普拉斯方差,越高越清晰
  - 亮度 (0~30): 80~180 舒适区间满分
  - 色彩丰富度 (0~30): RGB 三维直方图非零 bin
- score_frames(): 批量评分+排序
- select_best_frame(): 选出最佳帧
- 降级策略:cv2 不可用时返回 50.0 默认分

修改 thumbnail_generator.py:
- extract_and_upload_cover_frames: num_frames=3→5
- 抽帧后对所有候选帧进行质量评分
- 按分数从高到低排序返回
- 统一临时文件管理(评分后清理)

修改 generation_cover.py:
- E1/E2 步骤 max_frames=1→5
- 新增 _select_best_frame_from_snapshots() 辅助函数
- MediaKit 抽多帧后通过质量评分选最佳

修改 render_adapter.py:
- 调用 extract_and_upload_cover_frames 时 num_frames=5

测试:test_cover_frame_scorer.py(18 个测试)
2026-09-07 18:18:19 +08:00
..
2026-07-03 18:49:54 +08:00
2026-07-03 18:56:16 +08:00