can not display a video with gstreamer pipeline + qml sink within qwidgets layout

[cfd new]

I am trying to use qml sink inside a qwidget and play video with a gstreamer pipeline. What I am doing is to load a qml sinkand lay it out in a simple qwidget. 

When I start to play the video, I get the following error:

error Could not initialize window system

Debugging info: gstqtsink.cc(309): gst_qt_sink_change_state (): /GstGLSinkBin:glsinkbin0/GstQtSink:sink

Pure qml code works fine. What is wrong?


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