[Bug 773323] New: vaapidecode: fix buffer size

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773323

            Bug ID: 773323
           Summary: vaapidecode: fix buffer size
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vjaquez at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

When disabling vaapipostproc, if the allocation caps are different from the
negotiation caps, the software sinks (e.g. xvimagesink) cannot map the frame
because the GstVideoMeta reports the allocation caps size, not the 
negotiated caps.

The attached patch worksarounds the issue by rewritting the values of the
video meta, though the real solution would be using the the negotiation
caps when setting the GstVideoMeta in the vaapibufferpool

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