extern mlt_deque mlt_frame_service_stack( mlt_frame self );
extern mlt_producer mlt_frame_get_original_producer( mlt_frame self );
extern void mlt_frame_close( mlt_frame self );
+extern mlt_properties mlt_frame_unique_properties( mlt_frame self, mlt_service service );
/* convenience functions */
extern int mlt_sample_calculator( float fps, int frequency, int64_t position );