[Bug 768272] New: oggdemux: Reverse keyframe seek doesn't work

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768272

            Bug ID: 768272
           Summary: oggdemux: Reverse keyframe seek doesn't work
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bilboed at bilboed.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

How to reproduce :
USE_PLAYBIN3=1 gst-validate-launcher -S -m -t
validate.file.playback.reverse_playback 

oggdemux will fail to find the appropriate previous keyframe for the requested
seek position (10s).

This results in oggdemux pushing a lot of non-keyframe theora packets
downstream, eventually causing multiqueue to deadlock downstream (theoradec
drops everything, video stream never prerolls, audio stream blocks, boom).

Initial analysis seems to be that gst_ogg_demux_do_seek() should be using
gst_ogg_demux_get_prev_page() instead of _next_page() when looking for the
target granule (containing a keyframe).

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