Setting pad properties of glvideomixer

[Arjen Veenhuizen]

The glvideomixer has "sometimes" sinkpads (see gst-inspect-1.0 glvideomixer).
Therefore, you cannot use get_static_pad (it will return None). 

You should use pad_sink0 = get_request_pad("sink_%u"). After that,
pad_sink0.set_property("xpos",0) should work just fine.




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