The decoded Data is not returned from the first frame; it must be used to 'prime' the decode engine. The duration of the first packet should be ignored also by the container, to make sure the total duration is trimmed correctly.
This commit fixes #6367. dd if=/dev/zero of=./silence.raw count=1 bs=500 oggenc --raw silence.raw --output=silence.ogg oggdec --raw --output silence.oggdec.raw silence.ogg ffmpeg -codec:a libvorbis -i silence.ogg -f s16le -codec:a pcm_s16le silence.libvorbis.ffmpeg.raw ffmpeg -i silence.ogg -f s16le -codec:a pcm_s16le silence.native.ffmpeg.raw ls -l *.raw Signed-off-by: Guangyu Sun <[email protected]> --- libavformat/oggparsevorbis.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/libavformat/oggparsevorbis.c b/libavformat/oggparsevorbis.c index 289900f7cf..1f922b3c7e 100644 --- a/libavformat/oggparsevorbis.c +++ b/libavformat/oggparsevorbis.c @@ -479,6 +479,13 @@ static int vorbis_packet(AVFormatContext *s, int idx) flags = 0; } os->pduration = duration; + /* Data is not returned from the first frame; it must be used to 'prime' + * the decode engine. The duration of the first packet should be ignored + * also by the container, to make sure the total duration is trimmed + * correctly. + */ + if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && os->segp == 1) + os->pduration = 0; } /* final packet handling -- 2.30.1 _______________________________________________ ffmpeg-devel mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
