[gstreamer-bugs] [Bug 623565] New: [matroskademux] gst should respect the matroska default flags for playback

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=623565
  GStreamer | gst-plugins-good | 0.10.23

           Summary: [matroskademux] gst should respect the matroska
                    default flags for playback
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.23
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: jazzrz86 at hotmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Currently, the matroska default flag is parsed in matroska-demux.c under the
add stream function. However, it remains unused. It should be used to determine
which video/audio/subtitle track should be displayed as they were intended by
the mkv creator.

This is particularly useful for example playback of english video with optional
english subtitles. In this case the subtitles which has a default track flag of
0 should not be displayed at all but made available to be accessed by clients.

Incidentally, which audio/subtitle stream gst plays when using playbin seems
indeterminate, with different streams playing by default at random for each
reset (as seen on totem 2.30.2). This would be fixed more or less by the above
enhancement.

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