GstChildProxy GstObject GstTagSetter GstObject GstElement GstImplementsInterface GstObject GstElement GstColorBalance GstObject GstImplementsInterface GstElement GstXOverlay GstObject GstImplementsInterface GstElement GstMixer GstObject GstImplementsInterface GstElement GstPhotography GstObject GstImplementsInterface GstElement MXFDescriptiveMetadataFrameworkInterface MXFDescriptiveMetadata