[Bug 797005] New: vaapi decode + glimagesink with DMABuf results in scrambled output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797005

            Bug ID: 797005
           Summary: vaapi decode + glimagesink with DMABuf results in
                    scrambled output
    Classification: Platform
           Product: GStreamer
           Version: 1.14.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nico.galoppo at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Created attachment 373420
  --> https://bugzilla.gnome.org/attachment.cgi?id=373420&action=edit
glsinkimage output screenshot

Now the following pipeline runs without pipeline errors, but the glimagesink
output is scrambled (see attached screenshot): 

gst-launch-1.0 -v souphttpsrc
location=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm
! matroskademux ! vaapidecodebin ! "video/x-raw(memory:DMABuf)" ! glimagesink

It looks like wrong image frame metadata is passed, perhaps incorrect stride. 

The following pipeline runs correctly (not buggy), but since I'm not using a
capsfilter, it's going through video/x-raw(meta:GstVideoGLTextureUploadMeta) at
the glimagesink. 

gst-launch-1.0 -v souphttpsrc
location=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm
! matroskademux ! vaapidecodebin !
video/x-raw(meta:GstVideoGLTextureUploadMeta) ! glimagesink

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