MKV: cluster boundaries now require a video keyframe in addition to the
5s minimum, so every cluster has a CuePoint at its start. Pre-first-
keyframe frames are dropped. Adds a SeekHead at Segment start with
fixed-width back-patched SeekPositions for Info/Tracks/Chapters/Cues.
Before this change a 2h26m UHD rip had 52 CuePoints across ~1750
clusters and a 16.5-minute gap between adjacent seek entries; players
seeking inside that gap had to scan from the prior cue. After, one
CuePoint per cluster.
TS (tsmux production path + m2ts_mux): PesFrame.keyframe is plumbed
end-to-end. Codec-private parameter sets are prepended on the first
keyframe (not the first frame); non-key video before any keyframe is
dropped. The first TS packet of a keyframe video PES carries an
adaptation field with random_access_indicator=1. m2ts_mux previously
hardcoded RAI=1 on every PCR packet; that is now gated on the current
PES being a keyframe video PES, combining correctly with PCR when both
land on the same packet.
Adds 17 tests covering keyframe alignment, cue count/position/timing,
SeekHead correctness, RAI set/clear, codec_private gating, non-key drop,
and PCR+RAI combination.
matthew
398430af09