case Gst::STATE_CHANGE_READY_TO_PAUSED:
return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
case Gst::STATE_CHANGE_PAUSED_TO_PLAYING:
case Gst::STATE_CHANGE_READY_TO_PAUSED:
return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
case Gst::STATE_CHANGE_PAUSED_TO_PLAYING: