[Bug 742938] New: v4l2videodec: Could fail early on unsupported video that has codec_data

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742938
  GStreamer | gst-plugins-good | git

           Summary: v4l2videodec: Could fail early on unsupported video
                    that has codec_data
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Unfortunately MFC fails when reading certain video headers. It is not clear
why, but failing early would allow decodebin to skip the decoder and use a SW
decoder as replacement.

One of the failing media is found in gst-validate:
gst-validate/gst-integration-testsuites/medias/defaults/mxf/op2b-mpeg2-wave_hd.mxf

The solution would be to setup the output format and queue in set_format()
method if a codec_data is provided instead of doing it in handle_frame().
Failing at that stage allow decodebin to skip the decoder instead of failing
the pipeline.

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