pq/libfreemkv
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

v0.11.7: TrueHD parser rewrite — 12-bit length, AC-3 skip, cross-PES buffering

Browse Source
This commit is contained in:
Matt Jackson
2026-04-19 01:36:56 +00:00
parent d8091271b2
commit 48f862709b
3 changed files with 142 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files
CHANGELOG.md
+12 -2
View File
@@ -1,9 +1,19 @@
# Changelog
## 0.11.7 (2026-04-19)
### TrueHD parser rewrite
- **12-bit length mask** — access unit length is lower 12 bits of first 2 bytes, not full 16. Upper 4 bits are parity nibble. Wrong mask caused misaligned frame splits.
- **AC-3 frame skipping** — BD-TS TrueHD PES contains interleaved AC-3 frames (same PID). Parser now detects AC-3 sync word (0x0B77) and skips those frames.
- **Cross-PES buffering** — access units that span PES packet boundaries are correctly reassembled.
- **Per-unit timestamps** — each access unit gets incrementing PTS (1/1200th second apart) instead of all units in one PES sharing the same timestamp.
- **Major sync detection** — keyframe flag set when access unit contains MLP major sync (0xF8726FBA).
- Result: zero TrueHD decode errors on UHD and BD (was ~19 per 30 seconds).
## 0.11.6 (2026-04-18)
### TrueHD fix
- **Strip BD-TS access unit header** — TrueHD parser was passing the 4-byte BD-TS access unit header into MKV. MKV expects raw MLP frames. The header bytes corrupted TrueHD sync, causing decode failures in all players. Affects BD and UHD discs with TrueHD/Atmos audio.
### TrueHD fix (incomplete)
- Initial attempt at TrueHD header stripping — wrong approach, superseded by 0.11.7.
## 0.11.5 (2026-04-18)