- AnnexBSplitter incrementally splits the Annex-B stream into access
units, holding partial slices across packet feeds.
- VideoDecoder exposes feedAccessUnit and the decoded frame rate.
- PlaybackEngine demuxes and decodes in lockstep, tagging video frames
and audio chunks with 90 kHz PTS (audio from PES headers, video from
PES anchors interpolated by decoder frame rate).
- CLI 'play' command runs the engine headlessly and reports A/V drift.
- Validated against Batman Begins: 95 frames in 4.0s, max drift -78.6 ms
(video trails audio at stream start), avg frame duration 3833.6 ticks.
- Tests for AnnexBSplitter.
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