[Bug 719359] New: VP8 decoder doesn't handle changes in resolution

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719359
  GStreamer | gst-plugins-good | 1.0.10

           Summary: VP8 decoder doesn't handle changes in resolution
    Classification: Platform
           Product: GStreamer
           Version: 1.0.10
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: tcdgreenwood at hotmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=262856)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=262856)
Patch that applies to 1.2.1

When decoding VP8 it's possible for the stream to change resolution mid-stream
which currently doesn't work as the caps are not changed.  This can lead to a
band of corruption especially along the bottom or side of the video.

Changes in resolution typically happen with streams generated by tablets or
phones as rotation causes the camera to change aspect ratio.

The patch attached is fairly straightforward in that it calls
gst_video_decoder_set_output_state if the output image doesn't match the size
of the current output state.

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