id summary reporter owner description type status priority component version resolution keywords cc blockedby blocking reproduced analyzed 735 Incorrect DTS sync in OGG codec zvi "Hi, I've noticed incorrect DTS values in OGG encoded audio streams (as part of an OGV file). This happened with a ffmpeg-0.8.7 These are the steps I have taken to reproduce it. 1. Convert a valid and working MP4 (h264/aac) as confirmed by ffprobe to an OGV file using: {{{ ffmpeg -y -i vid.mp4 -vcodec libtheora -b 1000k -acodec libvorbis -ab 192k vid.ogv }}} 2. Probing the ""vid.ogv"" file using ffprobe shows that during audio frames, the ""pos"" doesn't change - even for the video frames it seems to repeat ~10 times. See simplified format dump below. 3. While ""vid.ogv"" plays ok in VLC, after doing a zero transformation on it, it breaks completely and audio goes totally out of sync (video plays ok). {{{ ffmpeg -y -i vid.ogv -vcodec copy -acodec copy new_vid.ogv }}} 4. The '''new_vid.ogv''' file no longer plays correctly. Putting some debug prints in ffmpeg.c:output_packet(...) I see the following.[[BR]] A sequence of consecutive audio frames gets the correct DTS values. From 0 to 10941 in steps of ~64.[[BR]] Then there is a sequence of consecutive video frames. For video the DTS always appears to be correct.[[BR]] The next sequence of consecutive audio frames now starts at 154048 - instead of being at ~11005[[BR]] Also notice the negative '''duration''' value. {{{ Input #0, ogg, from 'new_vid.ogv': Duration: -513359:-56:-35.41, start: 0.000000, bitrate: N/A Stream #0.0: Video: theora, yuv420p, 960x540 [PAR 1:1 DAR 16:9], 29.97 tbr, 29.97 tbn, 29.97 tbc Stream #0.1: Audio: vorbis, 48000 Hz, stereo, s16, 192 kb/s }}} If you need any additional information, please let me know. Thanks, TR {{{ type=video index=0 dts=0 dts_time=0.000000 [100/2997] duration=1 pos=7414 type=video index=0 dts=1 dts_time=0.033367 [100/2997] duration=1 pos=7414 type=video index=0 dts=2 dts_time=0.066733 [100/2997] duration=1 pos=7414 type=video index=0 dts=3 dts_time=0.100100 [100/2997] duration=1 pos=7414 ... type=video index=0 dts=83 dts_time=2.769436 [100/2997] duration=1 pos=260411 type=audio index=1 dts=0 dts_time=0.000000 [1/48000] duration=0 pos=323479 type=audio index=1 dts=N/A dts_time=N/A [1/48000] duration=0 pos=323479 type=audio index=1 dts=N/A dts_time=N/A [1/48000] duration=0 pos=323479 ... type=audio index=1 dts=N/A dts_time=N/A [1/48000] duration=0 pos=323479 type=audio index=1 dts=N/A dts_time=N/A [1/48000] duration=0 pos=323479 type=video index=0 dts=84 dts_time=2.802803 [100/2997] duration=1 pos=260411 type=video index=0 dts=85 dts_time=2.836170 [100/2997] duration=1 pos=355961 type=video index=0 dts=86 dts_time=2.869536 [100/2997] duration=1 pos=355961 type=video index=0 dts=87 dts_time=2.902903 [100/2997] duration=1 pos=355961 type=video index=0 dts=88 dts_time=2.936270 [100/2997] duration=1 pos=355961 type=video index=0 dts=89 dts_time=2.969636 [100/2997] duration=1 pos=355961 type=video index=0 dts=90 dts_time=3.003003 [100/2997] duration=1 pos=355961 type=video index=0 dts=91 dts_time=3.036370 [100/2997] duration=1 pos=355961 type=video index=0 dts=92 dts_time=3.069736 [100/2997] duration=1 pos=355961 type=video index=0 dts=93 dts_time=3.103103 [100/2997] duration=1 pos=355961 type=video index=0 dts=94 dts_time=3.136470 [100/2997] duration=1 pos=355961 type=video index=0 dts=95 dts_time=3.169837 [100/2997] duration=1 pos=355961 type=video index=0 dts=96 dts_time=3.203203 [100/2997] duration=1 pos=355961 type=video index=0 dts=97 dts_time=3.236570 [100/2997] duration=1 pos=355961 type=video index=0 dts=98 dts_time=3.269937 [100/2997] duration=1 pos=419330 type=video index=0 dts=99 dts_time=3.303303 [100/2997] duration=1 pos=419330 type=video index=0 dts=100 dts_time=3.336670 [100/2997] duration=1 pos=419330 type=video index=0 dts=101 dts_time=3.370037 [100/2997] duration=1 pos=419330 type=video index=0 dts=102 dts_time=3.403403 [100/2997] duration=1 pos=419330 type=video index=0 dts=103 dts_time=3.436770 [100/2997] duration=1 pos=419330 type=video index=0 dts=104 dts_time=3.470137 [100/2997] duration=1 pos=419330 type=video index=0 dts=105 dts_time=3.503504 [100/2997] duration=1 pos=419330 ... type=video index=0 dts=148 dts_time=4.938272 [100/2997] duration=1 pos=545023 type=audio index=1 dts=154048 dts_time=3.209333 [1/48000] duration=0 pos=608173 type=audio index=1 dts=N/A dts_time=N/A [1/48000] duration=0 pos=608173 type=audio index=1 dts=N/A dts_time=N/A [1/48000] duration=0 pos=608173 }}}" defect closed normal undetermined git-master duplicate ogg vorbis sync 1 0