docs(sop): 群星马视频制作 SOP — 20 轮实战经验沉淀#2
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Author-Agent: 群星马 Helpers: 视频测试马（质检反馈）, 通信龙（产品信息）
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| - Remotion 输出帧序列 → ffmpeg 编码为最终视频 | ||
| - 常用参数：`-c:v libx264 -preset medium -crf 23` | ||
| - 字幕渲染：`drawtext` 滤镜，注意 fontfile 路径 | ||
| ⚠️ **必须 `-map 0:v -map 1:a`**（Remotion 输出有空音轨，不加 map 会选空音轨导致静音） |
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The warning here contradicts the command right above it: the pipeline builds a mixed track in filter_complex and maps it with -map "[aout]", but the note says to map 1:a. If someone follows the note, they will bypass the mixed/limited output (and in some variants can reselect an unintended track), which defeats the documented narration + BGM + limiter step.
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Author & Helpers
Summary
基于 anet.sh 产品视频 20 轮迭代实战经验（评分 5.85 → 8.18），大幅扩充两个 SOP 文档：
video-production-pipeline.md
tts-narration.md
后续会继续补充 ai-video-generation.md / composition-render.md / quality-assurance.md。