[totem-gstreamer] AV synchronization problems

[Mika Fischer]

Binary package hint: totem

When watching XviD videos the synchronization between Audio and Video is lacking. The problem is getting worse the longer I watch the video.

I have no such problems with totem-xine or gxine.

I tried setting all Audio options in the control panel to ALSA but that didn't help...

Let me know if you need more info.

ProblemType: Bug
Date: Tue Feb 20 20:42:19 2007
DistroRelease: Ubuntu 7.04
Uname: Linux mika-pc 2.6.20-8-generic #2 SMP Tue Feb 13 05:18:42 UTC 2007 i686 GNU/Linux

[Sebastien Bacher (seb128)]

thank you for your bug. Does it happen on a specific video or with any video? Do you get the same problem if you play it with "gst-launch-0.10 playbin uri=file:///path/to/file"?

[Mika Fischer (zoop)]

Sorry for the delay!

It happens with all XVID videos I've tested. Do you happen to know freely available videos in this format?

The problem persists with gst-launch-0.10 playbin, but there I also get some output which may help in finding the casue of the problem:

mika@mika-pc:~$ LANG=C gst-launch-0.10 playbin uri=file://$(pwd)/test.avi
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
No accelerated IMDCT transform found
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: audioclock1
WARNING: from element /playbin0/abin/audiosink/audiosink-actual-sink-alsadmix: Compensating for audio synchronisation problems
Additional debug info:
gstbaseaudiosink.c(827): gst_base_audio_sink_render (): /playbin0/abin/audiosink/audiosink-actual-sink-alsadmix:
Unexpected discontinuity in audio timestamps of more than half a second (0:00:00.500000000), resyncing
Got EOS from element "playbin0".
Execution ended after 1301864183000 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
FREEING pipeline ...

Any idea how to further debug this problem?

BTW: vlc also has no such problems.

[Sebastien Bacher (seb128)]

The bug is due to gstreamer then, could you get a debug log when trying to play the video? "GST_DEBUG_NO_COLOR=1 GST_DEBUG=5 gst-launch playbin uri=URI"?

[Mika Fischer (zoop)]

Well, GST_DEBUG=5 is completely over the top. It produces so much output that my computer couldn't play the video without skipping and my disk was filled up pretty fast. So I tried with 1, 2, 3 and 4. 1 does not give any more output, the output of 2 is attached. I'll also attach a gzipped version of the 3 output (12 MB unzipped!). The output with GST_DEBUG=4 is 2.7 GB so I'll skip that one as well...

[Sebastien Bacher (seb128)]

I've forwarded that upstream: http://bugzilla.gnome.org/show_bug.cgi?id=419351

[Sebastien Bacher (seb128)]

Comment from upstream:

"This kind of thing is much easier to look into with a sample file.

Could you make a log like this please:

 $ export GST_DEBUG_NO_COLOR=1
 $ GST_DEBUG=a52dec:5,*alsa*:5,baseaudiosink:5 gst-launch-0.10 playbin
uri=file:///home/mike/test.avi 2>dbg.log
 $ gzip dbg.log"

[Sebastien Bacher (seb128)]

We are closing this bug report as it lacks the information, described in the previous comments, we need to investigate the problem further. However, please reopen it if you can give us the missing information and don't hesitate to submit bug reports in the future.

[Sebastien Bacher (seb128)]

the log has been attached upstream, reopening

[Sebastien Bacher (seb128)]

could you attach an example to the bug or give an url to download one?

[Sebastien Bacher (seb128)]

the bug has been fixed upstream now

[Sebastien Bacher (seb128)]

the new version is available in ubuntu now