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xiaoxia
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xiaoxia
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xiaoxia
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2026-07-14 15:12:28 +08:00 |
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 CI Bot
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0bfff35301
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feat: 多轨道混音 + 字幕渲染引擎 + 视频拼接
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三个渲染能力后端实现：
1. 多轨道混音（multi_track_mixer.py）
- 支持任意数量音频轨道（原音/BGM/配音/音效/环境音）
- 每轨独立音量、淡入淡出、时间偏移
- 主输出音量控制 + 归一化补偿
- 降级：单轨失败自动跳过，混音失败回退主音频
2. 字幕渲染引擎（subtitle_render_engine.py）
- 统一 SubtitleStyle 配置：字体/颜色/描边/阴影/背景框/位置
- 9宫格位置 + 自定义边距
- 多源字幕合并：标题/静态字幕/ASR时间轴/手动字幕
- 淡入淡出动画效果
- 长文本自动换行
- 便捷函数 build_subtitles_from_plan + build_subtitle_filter
3. 视频拼接引擎（concat_engine.py）
- 两种模式：concat demuxer（stream copy，最快）+ concat filter（重新编码）
- 自动选择最优模式，参数不一致时智能降级
- 支持每段独立裁剪（start_time + duration）
- 支持输出分辨率/帧率指定，自动缩放+pad补齐
- 降级：某段失败跳过，不阻断整体拼接
接入：
- render_audio.py: mix_audio 新增 audio_tracks_config 参数
- unified_render_service.py: 从 plan.config.audio_tracks 读取配置
52个新增单测 + 2014个全套测试全绿，零回归
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2026-07-14 11:35:42 +08:00 |
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