#define MLT_FRAME_PROPERTIES( frame ) ( &( frame )->parent )
#define MLT_FRAME_SERVICE_STACK( frame ) ( ( frame )->stack_service )
+#define MLT_FRAME_IMAGE_STACK( frame ) ( ( frame )->stack_image )
+#define MLT_FRAME_AUDIO_STACK( frame ) ( ( frame )->stack_audio )
extern mlt_frame mlt_frame_init( );
extern mlt_properties mlt_frame_properties( mlt_frame self );