[Bug 721835] segment format assertion fails when video decoding

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=721835
  GStreamer | gst-plugins-base | 1.2.2

--- Comment #23 from Thiago Sousa Santos <thiago.sousa.santos at collabora.co.uk> 2014-01-11 04:32:15 UTC ---
Created an attachment (id=265987)
 View: https://bugzilla.gnome.org/attachment.cgi?id=265987
 Review: https://bugzilla.gnome.org/review?bug=721835&attachment=265987

videodecoder: do not lose events when dropping frames

Finally understood what is possibly happening here.

1) after the seek, the videodecoder is flushed
2) videodecoder gets a new segment
3) videodecoder receives its first buffer and attaches the segment event to it
4) avdec_h264 tries to decode this buffer, but it is not a keyframe and it
can't
   be decoded, so it skips it
5) videodecoder receives more buffers and still can't decode any of those
buffers
6) videodecoder finally gets a keyframe and is now able to decode this buffer,
   after decoding it, avdec_h264 goes over the list of pending frames and drops
   those that won't be useful anymore. The segment event is now lost
7) assertion!

Let's hope this is the case. Could you please test this patch?

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