[Bug 719636] New: deinterlace alterates caps in passthrough mode preventing hardware decode

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719636
  GStreamer | gst-plugins-good | git

           Summary: deinterlace alterates caps in passthrough mode
                    preventing hardware decode
    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: lionel.g.landwerlin at linux.intel.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I've been trying to get playbin to work with the vaapi plugins out of the box
and with the help of several people on the #gstreamer channel we finally
figured out one of the problem was in the deinterlace plugin.

It seems deinterlace alterates caps even though it's in passthrough mode, which
strips out the meta:GstVideoGLTextureUploadMeta capabilities of our video sink.
What follows is that the vaapidecode doesn't get to know about this caps and it
just happens to not link or not do software decode.

Attached is a patch to prevent the filtering in passthrough mode.

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