Change #275157

Category	ffmpeg
Changed by	Romain Beauxis <romain.beauxisohnoyoudont@gmail.com>
Changed at	Sat 18 Jul 2026 17:48:34
Repository	https://git.ffmpeg.org/ffmpeg.git
Project	ffmpeg
Branch	master
Revision	63b7e4cefa91aac517e3012d64f75c754e680674

Comments

lavf/oggparsevorbis: rework timestamp offset and end trimming
Replace the first-page packet scan with a direct use of the first
packet's duration as the timestamp offset (the Vorbis I spec
guarantees it produces no PCM output).

Track last_page_granule to correctly anchor EOS trimming regardless
of any initial granule offset. Track bos_pos to reinitialize parser
state at stream boundaries without resetting at page boundaries.

Restore the granule=0 workaround from ticket #3710 and handle
chained streams by clearing bos_pos when new headers are collected.

Vorbis I spec: https://xiph.org/vorbis/doc/Vorbis_I_spec.html

Changed files

libavformat/oggdec.c
libavformat/oggdec.h
libavformat/oggparsevorbis.c
tests/ref/fate/limited_input_seek
tests/ref/fate/limited_input_seek-copyts
tests/ref/fate/mov-mp4-chapters
tests/ref/fate/ogg-vorbis-bear
tests/ref/fate/ogg-vorbis-chained-meta.txt
tests/ref/fate/ogg-vorbis-initial-padding-chained
tests/ref/fate/ogg-vorbis-libvorbis-1s
tests/ref/fate/ogg-vorbis-libvorbis-30s
tests/ref/fate/ogg-vorbis-ts-offset
tests/ref/fate/ogg-vorbis-ts-seek
tests/ref/fate/webm-dash-chapters
tests/ref/lavf-fate/vp8.ogg