[gstreamer-bugs] [Bug 504642] mpeg2enc deadlock

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: 0.10.14

Mark Nauwelaerts changed:

           What    |Removed                     |Added
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                 CC|                            |manauw at skynet.be




------- Comment #6 from Mark Nauwelaerts  2008-03-04 17:59 UTC -------
The situation described above is predictably outlined in
http://gentrans.sourceforge.net/docs/head/manual/html/howto.html#sect-mpeg-encoding

To elaborate here; (at present) mpeg2enc does not put timestamps on its output
buffers.  avimux tries to do the best it can with this, and assumes that these
buffers provide some sort of codec/extra-data and makes sure these go in first.
Unfortunately, in this case, it never stops.  So avimux keeps on "pulling in
video" from the input file.  This creates a huge video/audio imbalance (that
can carry on as long/large the queues can handle it) which will eventually
block the pipeline.  As such, actually, the video content grows and grows,
regularly emptying the video queues in between, whereas the audio queues will
grow and grow and never be emptied.  And indeed, whatever output may have been
made should only contain video.

mpeg2enc can not really be blamed either (well, you might :) ), having no
"official" libmpeg2enc specs telling it what to do with provided output
(AFAIK?)  So, that only leaves some hope and the work-around given in URL
above, or using mpeg2enc updated with the patches in bug 520329, which does
make some effort at providing output timestamps.  Tests then show it does
generally work out well  (though don't know about the particular input file).


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