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实现 v1.3 爆款视频参考风格分析 6 步管线： ① FFmpeg 抽关键帧（每 2s 一帧 + 场景切换帧） ② PySceneDetect ContentDetector(threshold=27) 镜头分割 ③ OpenCV Farneback 光流运镜检测（推/拉/摇/移/zoom/static + 强度） ④ librosa BPM 分析（>110 fast_cut / 80-110 medium / <80 slow_cinematic） ⑤ OSS 上传关键帧 + 豆包 VLM 色调/构图/光线分析 ⑥ 豆包 LLM 整合 style_guide JSON（失败走规则合成降级） 新增渲染参数映射： - 运镜 → ken_burns 参数（push_in→zoom_in_slow、tilt_up→pan+zoom 等 11 种） - 转场 → TransitionEngine xfade 名称（hard_cut→cut/dissolve/wipeleft 等） - 色调 → FFmpeg eq + colorchannelmixer 预设（5 套：warm_vintage/cool_fresh/high_contrast/soft_pastel/dramatic_cinematic） - BPM → BGM 选曲 BPM±5 提示 - build_render_params_for_clip() 按镜头索引聚合可直接喂 URS 的参数 降级链： - FFmpeg 抽帧失败 → VLM 路径；OpenCV 不可用 → static/low；librosa 不可用 → VLM 估计； - LLM/VLM 不可用 → 规则合成 style_guide；任意子步骤异常不抛，best-effort 返回最小可用 style_guide。 资源约束：参考视频 ≤60s/≤100MB，总超时 60s，临时帧 try/finally 清理。 依赖新增：scenedetect==0.6.4、librosa==0.10.2.post1、soundfile==0.12.1（requirements-worker.txt）。 orchestrator 改为从 apps.worker.viral_video.video_analyzer 导入 analyze_video_style， 传入 style_strength 透传 light/medium/strict 三档。 单测 48 条覆盖：映射函数/光流运镜判定/BPM 档位/规则合成/聚合输出/降级/临时文件清理。