[Bug 738129] New: GstGLMixer download texture even if sink element is gl based

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738129
  GStreamer | gst-plugins-bad | git

           Summary: GstGLMixer download texture even if sink element is gl
                    based
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: comicfans44 at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I found commit 
c44352b11f8a5ee8cb6f1710ac90d17076124e69
gl: download whenever we have sysmem capsfeatures


cause GstGLMixer always download texture ,even if sink element is glimagesink
or glfilter .

GstGLMixer _negotiated_caps always receive caps with capsfeatures
"memory:SystemMemory", not "memory:GLMemory" , seems this causes the problem.

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