[Bug 749226] New: vtdec_hw attempts to play back 422-encoded h264

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749226

            Bug ID: 749226
           Summary: vtdec_hw attempts to play back 422-encoded h264
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hfink at toolsonair.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When trying to play back 422-encoded h264, vtdec_hw still tries to decode the
stream, even though the HW decoder is only able to decode 420. This results in
corrupt images since the stream is interpreted as 420.

There are a few things that can be done: 

* Make sure to also pass on the pixel format in gst_vtdec_set_format
* Use CMVideoFormatDescriptionCreateFromH264ParameterSets to get the correct
description (works when stream-format=avc, should be available in codec_data in
caps). I guess this should be the preferred way.

A sample 422-encoded file is attached.

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