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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 747881
           Summary: matroskamux generates choppy audio when remuxing from
                    rtsp stream
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ramiro.polla at collabora.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

While remuxing from an RTSP stream, matroskamux generates output with choppy
audio. It can be reproduced with:

$ gst-launch-1.0 -e uridecodebin
uri=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
caps="video/x-h264; audio/mpeg,mpegversion=(int)4" name=d ! h264parse !
matroskamux name=m ! filesink location=oute.mkv d. ! aacparse ! m.

CTRL+C after a while

$ gst-play-1.0 oute.mkv

The output file will play back normally under ffplay and mpv, but not under
gst-play or vlc.

Remuxing the RTSP stream with ffmpeg results in a file that is playable by
ffplay, mpv, gst-play, and vlc.
$ ffmpeg -i rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
-vcodec copy -acodec copy outf.mkv

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