[Bug 747881] matroskamux generates choppy audio when remuxing from rtsp stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747881

--- Comment #2 from Ramiro Polla <ramiro.polla at collabora.co.uk> ---
The same thing happens with or without the queue. You can record only the audio
stream as well and the error will still be present:
$ gst-launch-1.0 -e uridecodebin
uri=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
caps="audio/mpeg,mpegversion=(int)4" ! aacparse ! matroskamux ! filesink
location=oute.mkv

On playback we get some discontinuity warning messages:
$ GST_DEBUG=audiobasesink:4 gst-play-1.0 -q oute.mkv 
0:00:01.469927406  4232 0x7f01e4003de0 WARN           audiobasesink
gstaudiobasesink.c:1608:gst_audio_base_sink_get_alignment:<pulsesink0>
Unexpected discontinuity in audio timestamps of +0:00:00.256083333, resyncing
0:00:03.105018865  4232 0x7f01e4003de0 WARN           audiobasesink
gstaudiobasesink.c:1608:gst_audio_base_sink_get_alignment:<pulsesink0>
Unexpected discontinuity in audio timestamps of +0:00:00.428666666, resyncing
0:00:04.818736537  4232 0x7f01e4003de0 WARN           audiobasesink
gstaudiobasesink.c:1608:gst_audio_base_sink_get_alignment:<pulsesink0>
Unexpected discontinuity in audio timestamps of +0:00:00.173000000, resyncing

If we change the discont-wait property in pulsesink, we get more or less time
of uninterrupted audio playback, but then there noticeable audio/video desync.

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