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It's impossible to create another pipeline with d3dvideosink after disposing the previous one due to some problem in d3dvideosink. The message is: "Unable to register Direct3D hidden window class". I've evaluated the problem and it's that UnregisterClass() in working thread is called before DestroyWindow() and UnregisterClass() does nothing. https://bugzilla.gnome.org/show_bug.cgi?id=722622
d9699932