giles 0bd8ee71c7 Fix MP4 mux for web playback: add faststart and genpts ...

- Add -movflags +faststart to move moov atom to start
- Add -fflags +genpts for proper timestamp generation
- Fixes jerky playback and video/audio desync

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-02-04 00:32:45 +00:00

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