[Bug 747840] New: validate: glvideomixer sometimes fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747840

            Bug ID: 747840
           Summary: validate: glvideomixer sometimes fails
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-devtools
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gdesmott at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I often get this error when trying to run, for example,
validate.file.glvideomixer.simple.fast_forward.synchronized

Pipeline started
[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.
lt-gst-validate-1.0: xcb_io.c:179: dequeue_pending_request: Assertion
`!xcb_xlib_unknown_req_in_deq' failed.


Setting GST_GL_XINITTHREADS seems to fix the issue (see bug#731525). Is that
something we should add to the tests env?

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