+#define MLT_MULTITRACK_PRODUCER( multitrack ) ( &( multitrack )->parent )
+#define MLT_MULTITRACK_SERVICE( multitrack ) MLT_PRODUCER_SERVICE( MLT_MULTITRACK_PRODUCER( multitrack ) )
+#define MLT_MULTITRACK_PROPERTIES( multitrack ) MLT_SERVICE_PROPERTIES( MLT_MULTITRACK_SERVICE( multitrack ) )
+