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In addition, I did this in the bus sync handler
GstXOverlay *xoverlay;
xoverlay = GST_X_OVERLAY (GST_MESSAGE_SRC(msg));
gst_x_overlay_set_xwindow_id(xoverlay,obj->m_winId);
if I comment the gst_x_overlay_set_xwindow_id(...), it will not chrash, but the video will not show on the widget which I want
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