[Bug 687625] New: Subtitles (ssa/vobsub) not showing on matroska video with playback-test

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=687625
  GStreamer | gst-plugins-base | 1.0.2

           Summary: Subtitles (ssa/vobsub) not showing on matroska video
                    with playback-test
    Classification: Platform
           Product: GStreamer
           Version: 1.0.2
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rawoul at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


With 1.0.2 or git master, playback-test never shows any subtitles for the
following video:

# playback-test 0 http://absolut.zogzog.org/share/samples/mkv/paprika.mkv

The video contains 4 subtitle tracks, 1 SSA and 3 VOBSUB. MPlayer, VLC or
Gstreamer cannot display the SSA track for some reason, however only Gstreamer
fails to display the DVD subtitles. When switching to a DVD subtitle track, the
following warning appears and the video freezes:

pre-colorspace: not negotiated (gstbasetransform.c(2081):
gst_base_transform_handle_buffer ():
/GstPlayBin:playbin0/GstPlaySink:playsink/GstBin:tbin/GstSubtitleOverlay:suboverlay/GstVideoConvert:pre-colorspace:
not negotiated)

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