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Ran 04 May 2026 05:23AM UTC

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Committed 04 May 2026 05:22AM UTC coverage: 45.036% (+0.08%) from 44.952%

Job # 25302521797.1

Build Type

Pull #77

github

Committed by

tobbee

Commit Message

feat(catalog): expose accurate per-packaging bitrate

Catalog Bitrate now reflects the actual wire footprint of each track,
correctly differentiating clear CMAF, encrypted CMAF (cenc/cbcs), and
LOC. Previously all CMAF tracks shared one estimator (constants from
draft-09 mp4ff layout) and LOC reported the raw sample bitrate — so
encryption overhead and LOC framing were invisible to clients.

- calcCmafBitrate measures actual chunk size via GenCMAFChunk for the
  track's real configuration (sample batch, encryption scheme,
  subsample density). Self-consistent under future packaging tweaks.
- calcLOCBitrate adds per-object MoQ + LOC Timestamp extension overhead
  and (for video) the VPS/SPS/PPS prepended to every IRAP frame.
- GenCMAFChunk enables mp4ff OptimizeTrun, which promotes constant
  per-sample fields into tfhd defaults. Audio per-extra-sample drops
  from 16 B to ~3 B (4 B sample-size, 0 B for tracks with constant
  sample size), shaving real bytes off every audio chunk on the wire.

Pull Request Pull Request #77: feat(catalog): expose accurate per-packaging bitrate

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