[Bug 750815] New: GStreamer doesn't negotiate gl caps properly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750815

            Bug ID: 750815
           Summary: GStreamer doesn't negotiate gl caps properly
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: marcin.kolny at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I have following pipeline:
./gst-launch-1.0 videotestsrc ! glfilterblur ! glfilterblur ! xvimagesink


And caps between glfilterblurs:
video/raw, format=(string)YUY2, width=(int)320, height=(int)240,
framerate=(fraction)0/1

I think, it should be some kind of:
video/x-raw(memory:GLMemory)...

I'm not sure, whether it is a bug, or a feature, but if feature, please explain
me why GStreamer preffer upload/download textures twice instead of doing it
once?
Btw., when I add glimagesink instead of xvimagesink, caps between glfilterblurs
and glimagesink seem to be ok(I mean, contain information about GLMemory).

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