[Bug 745178] New: Crash when using multiple GL elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745178

            Bug ID: 745178
           Summary: Crash when using multiple GL elements
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: isaac at isrv.pw
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When using multiple GL elements in a pipeline, Gstreamer crashes with an XCB
error:

$ gst-launch-1.0 gltestsrc ! glvideomixer name=m ! glimagesink gltestsrc ! m.
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Got context from element 'm': gst.gl.GLDisplay=context,
gst.gl.GLDisplay=(GstGLDisplay)"\(GstGLDisplayX11\)\ gldisplayx11-0";
[xcb] Unknown request in queue while dequeuing
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been
called
[xcb] Aborting, sorry about that.
gst-launch-1.0: ../../src/xcb_io.c:179: dequeue_pending_request: Assertion
`!xcb_xlib_unknown_req_in_deq' failed.
Aborted

Calling Xlib's XInitThreads() from a C-based application fixes the issue.
However, my program uses Python and Python's Xlib implementation doesn't
implement XInitThreads.

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