[Bug 679250] New: Reverse playback not working with webm file

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=679250
  GStreamer | gstreamer (core) | 0.10.36

           Summary: Reverse playback not working with webm file
    Classification: Platform
           Product: GStreamer
           Version: 0.10.36
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: xartigas.bugzilla at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=217815)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=217815)
Playback tutorial 13 from the GStreamer SDK tutorials

The attached code exercises multiple trick modes.
With a webm file, frame stepping and fast forward seem to work correctly, but,
going backwards (press 'D') is completely ignored for HTTP files and hangs with
this message for local files:
CRITICAL **: gst_matroska_demux_seek_to_previous_keyframe: assertion
`demux->seek_index' failed

gst-playback-test is reported as not working nicely either.

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