[Bug 763732] glwindow: no video frame when use QT created window on X11

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763732

--- Comment #6 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #5)
> I'm still not sold on why this is necessary, the videooverlay example in
> https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/tests/examples/
> gl/qt/videooverlay works with the current code.  It even does what you do by
> setting the window handle on NULL.

This example also cannot work on my platform (i.Mx6Q). Only show white window.
When pipeline state is NULL, window_x11->internal_win_id has not created, set
window handle will pass window_x11->internal_win_id to XResizeWindow and
XReparentWindow. I think this is the root cause for my issue. But I don't know
why it works on your platform

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