GraphicsVideoSurface: Set the video sink to NULL state before disposing it.
GraphicsVideoSurface: Set the video sink to NULL state before disposing it.

In videoSink(), qtglvideosink is always set to READY state on construction,
to verify that the setup supports OpenGL. If the state of this element is
not changed later, GStreamer will complain when disposing it.

tswindell/qt-gstreamer,ylatuya/qt-gstreamer,shadeslayer/qtgstreamer,comicfans/libqtgstreamer,shadeslayer/qtgstreamer,detrout/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,tswindell/qt-gstreamer,iperry/qt-gstreamer,dejunk/gstreamer,GStreamer/qt-gstreamer,knuesel/qt-gstreamer,ylatuya/qt-gstreamer,comicfans/libqtgstreamer,iperry/qt-gstreamer,nasserGanjali/QtGStreamer,dejunk/gstreamer,knuesel/qt-gstreamer,comicfans/libqtgstreamer,iperry/qt-gstreamer,dejunk/gstreamer,nasserGanjali/QtGStreamer,detrout/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,tswindell/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,detrout/qt-gstreamer,shadeslayer/qtgstreamer,GStreamer/qt-gstreamer,knuesel/qt-gstreamer,ylatuya/qt-gstreamer,nasserGanjali/QtGStreamer,GStreamer/qt-gstreamer