Should wait state change complete before start another state change. Can't ensure can received async-done message when state change from PLAYING to PAUSED. https://bugzilla.gnome.org/show_bug.cgi?id=736655
Should wait state change complete before start another state change. Can't ensure can received async-done message when state change from PLAYING to PAUSED. https://bugzilla.gnome.org/show_bug.cgi?id=736655