[Bug 767022] glimagesink + Python + Qt4 does not work as expected

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767022

--- Comment #4 from Håvard Graff (hgr) <havard.graff at gmail.com> ---
I also discovered that by setting the glimagesink to READY before setting the
window-id (my working scenario), this fixes a crash I was having on OSX when
using 2 glimagesinks at he same time. 50% of the time it would crash with
messages like:
gst_gl_context_get_window: assertion 'GST_IS_GL_CONTEXT (context)' failed
gst_gl_window_get_context: assertion 'GST_IS_GL_WINDOW (window)' failed

So by doing the READY-trick, this problems also goes away completely!

It seems to me that the stuff the sink is doing when going from NULL_TO_READY:

      if (!gst_gl_ensure_element_data (glimage_sink, &glimage_sink->display,
              &glimage_sink->other_context))
        return GST_STATE_CHANGE_FAILURE;

      gst_gl_display_filter_gl_api (glimage_sink->display, SUPPORTED_GL_APIS);

      if (!_ensure_gl_setup (glimage_sink))
        return GST_STATE_CHANGE_FAILURE;
      break;

Should complete first and not have the external window-handle
(glimage_sink->new_window_id) set before or during these operations to have
smooth runnings.

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