[Bug 690485] New: matroska file can't step/play backward

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=690485
  GStreamer | gst-plugins-good | 0.10.x

           Summary: matroska file can't step/play backward
    Classification: Platform
           Product: GStreamer
           Version: 0.10.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: lfarkas at lfarkas.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


if i create a matroska file with h264 encoded video stream than it can be
step/played backward, but if i put an xvid encoded stream into it then after
1-2 frame i got:

** (unknown:31610): CRITICAL **: gst_matroska_demux_seek_to_previous_keyframe:
assertion `demux->seek_index' failed

if i do the same with a file which is not already closed than it play a few
frame backward until the first I-frame, but then gives this error even if a
h264 video was in the stream:

** (unknown:7934): CRITICAL **: gst_matroska_demux_seek_to_previous_keyframe:
assertion `demux->seek_index' failed PAUSED

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