render-finallisted

# Render Final / 最终渲染 ## When to use / 何时使用 After all QC passes. Produces the master mezzanine the exports derive from. 所有 QC 通过后，渲染主母版，作为各平台导出的源。 ## Inputs / 输入 - `workspace/timeline.json`, master audio, A/B-roll clips. - `--res` default 1920x1080, `--fps` 30. ## Output / 输出 - `workspace/final/master.mp4` (H.264 high, yuv420p, CRF 16, AAC 320 kbps). ## Steps / 步骤 1. Build ffmpeg filter_complex from timeline (overlay B-roll on A-roll, audio amix). 2. Encode with `-c:v libx264 -preset slow -crf 16 -pix_fmt yuv420p -c:a aac -b:a 320k`. 3. Verify duration, A/V sync, color range. ## Examples / 示例 ``` ffmpeg -i a.mp4 -i b.mp4 -filter_complex "overlay=enable='between(t,12,16)'" master.mp4 ``` ## Failure recovery / 失败回退 - If filter graph fails, fall back to per-section render then concat. - If file > 5 GB, re-encode CRF 18.