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Ran 10 May 2026 01:59AM UTC

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Committed 10 May 2026 01:57AM UTC coverage: 74.883% (-0.6%) from 75.496%

Job # 25617079251.1

Build Type

Pull #25

github

Committed by

paskal

Commit Message

Add post-recording VBR header fix to recorded MP3s

Recorded MP3s have variable bitrate (icecast source mixes 32-128 kbps
frames depending on speech vs silence) but no Xing/Info VBR header.
Without that header, players estimate duration from the first frame's
bitrate, which is wildly wrong: a 3h15m recording shows up as 8h42m in
Apple/Safari, and seeking past the real audio end stalls the player.

Fixed by remuxing the file with `ffmpeg -c copy -f mp3` after metadata
injection. ffmpeg adds a proper Xing header (frame-counted duration),
preserves all ID3 tags including TLEN and CHAP/CTOC frames, and doesn't
re-encode (~1s for a 140 MB file).

The post-processor no-ops cleanly when ffmpeg isn't on PATH, so dev/test
runs without the dependency still work.

Pull Request Pull Request #25: Add post-recording VBR header fix to recorded MP3s

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