[Bug 732662] New: glmixer didn't got the GstGLContext from other element correctly

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732662
  GStreamer | gst-plugins-bad | 1.3.3

           Summary: glmixer didn't got the GstGLContext from other element
                    correctly
    Classification: Platform
           Product: GStreamer
           Version: 1.3.3
        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 this commit 

e1e2a88358c6aeba220d20ed9ff32af141cb2575
glmixer: send the stream-start event and the caps event after.

cause black screen if glvideomixer is not the last element before glimagesink

pipeline constructed as 

videotestsrc ! glvideomixer ! glfilterblur ! glimagesink

glmixer didn't got GstGLContext , then created a GstGLContext itself. 

but if pipeline constructed as 

videotestsrc ! glfilterblur ! glvideomixer ! glimagesink

everything seems OK

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