[Bug 687376] New: Short circuit gst_vp8_dec_handle_frame if keyframe is missing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=687376
  GStreamer | gst-plugins-good | 1.0.2

           Summary: Short circuit gst_vp8_dec_handle_frame if keyframe is
                    missing
    Classification: Platform
           Product: GStreamer
           Version: 1.0.2
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: rishi.is at lostca.se
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


If dec->decoder_inited is FALSE, and a keyframe is missing, then open_codec
already calls gst_video_decoder_finish_frame.

So continuing with the gst_vp8_dec_handle_frame leads to a CRITICAL at this
point:
gst_buffer_map (frame->input_buffer, &minfo, GST_MAP_READ)
because the GST_IS_BUFFER assertion fails.

One way (although it does not happen always) to reproduce this bug is to try to
make a VoIP call using VP8 and Empathy. Sometimes you will see the video from
the other end for a moment and then the call will get disconnected. If you
check the empathy-call logs you will see the above CRITICAL.

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