+ // We'll store audio and video frames to use here
+ mlt_frame audio = NULL;
+ mlt_frame video = NULL;
+
+ // Temporary properties
+ mlt_properties temp_properties = NULL;
+
+ // Get the multitrack's producer
+ mlt_producer target = MLT_MULTITRACK_PRODUCER( multitrack );
+ mlt_producer_seek( target, mlt_producer_frame( parent ) );
+ mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) );
+
+ // We will create one frame and attach everything to it
+ *frame = mlt_frame_init( );
+
+ // Get the properties of the frame
+ frame_properties = MLT_FRAME_PROPERTIES( *frame );
+
+ // Loop through each of the tracks we're harvesting
+ for ( i = 0; !done; i ++ )
+ {
+ // Get a frame from the producer
+ mlt_service_get_frame( this->producer, &temp, i );
+
+ // Get the temporary properties
+ temp_properties = MLT_FRAME_PROPERTIES( temp );
+
+ // Check for last track
+ done = mlt_properties_get_int( temp_properties, "last_track" );
+
+ // Handle fx only tracks
+ if ( mlt_properties_get_int( temp_properties, "meta.fx_cut" ) )
+ {
+ mlt_properties copy = video == NULL ? frame_properties : MLT_FRAME_PROPERTIES( video );
+ int i = 0;
+
+ for ( i = 0; i < mlt_properties_count( temp_properties ); i ++ )
+ {
+ char *name = mlt_properties_get_name( temp_properties, i );
+ char *value = mlt_properties_get_value( temp_properties, i );
+ // For animated filters
+ if ( isdigit( name[ 0 ] ) && value != NULL )
+ mlt_properties_set( copy, name, value );
+ }
+
+ if ( video )
+ {
+ // Take all but the first placeholding producer and dump on to the image stack
+ void *p = mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( temp ) );
+ while ( ( p = mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( temp ) ) ) != NULL )
+ mlt_deque_push_back( MLT_FRAME_IMAGE_STACK( video ), p );
+ }
+ else
+ {
+ void *p = NULL;
+ while ( ( p = mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( temp ) ) ) != NULL )
+ mlt_deque_push_back( MLT_FRAME_IMAGE_STACK( *frame ), p );
+ mlt_properties_set_int( frame_properties, "meta.fx_cut", 1 );
+ }
+
+ if ( audio )
+ {
+ // Take all but the first placeholding producer and dump on to the audio stack
+ void *p = mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( temp ) );
+ while ( ( p = mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( temp ) ) ) != NULL )
+ mlt_deque_push_back( MLT_FRAME_AUDIO_STACK( audio ), p );
+ }
+ else
+ {
+ void *p = NULL;
+ while ( ( p = mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( temp ) ) ) != NULL )
+ mlt_deque_push_back( MLT_FRAME_AUDIO_STACK( *frame ), p );
+ mlt_properties_set_int( frame_properties, "meta.fx_cut", 1 );
+ }
+
+ // Ensure everything is hidden
+ mlt_properties_set_int( temp_properties, "hide", 3 );
+ }
+
+ // We store all frames with a destructor on the output frame
+ sprintf( label, "_%s_%d", id, count ++ );
+ mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL );
+
+ // We want to append all 'final' feeds to the global queue
+ if ( !done && mlt_properties_get_data( temp_properties, "data_queue", NULL ) != NULL )
+ {
+ // Move the contents of this queue on to the output frames data queue
+ mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "data_queue", NULL );
+ mlt_deque temp = mlt_deque_init( );
+ while ( global_feed && mlt_deque_count( sub_queue ) )
+ {
+ mlt_properties p = mlt_deque_pop_back( sub_queue );
+ if ( mlt_properties_get_int( p, "final" ) )
+ mlt_deque_push_back( data_queue, p );
+ else
+ mlt_deque_push_back( temp, p );
+ }
+ while( mlt_deque_count( temp ) )
+ mlt_deque_push_front( sub_queue, mlt_deque_pop_back( temp ) );
+ mlt_deque_close( temp );
+ }
+
+ // Now do the same with the global queue but without the conditional behaviour
+ if ( mlt_properties_get_data( temp_properties, "global_queue", NULL ) != NULL )
+ {
+ mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "global_queue", NULL );
+ while ( mlt_deque_count( sub_queue ) )
+ {
+ mlt_properties p = mlt_deque_pop_back( sub_queue );
+ mlt_deque_push_back( data_queue, p );
+ }
+ }
+
+ // Pick up first video and audio frames
+ if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 2 ) )
+ {
+ // Order of frame creation is starting to get problematic
+ if ( audio != NULL )
+ {
+ mlt_deque_push_front( MLT_FRAME_AUDIO_STACK( temp ), producer_get_audio );
+ mlt_deque_push_front( MLT_FRAME_AUDIO_STACK( temp ), audio );
+ }
+ audio = temp;
+ }
+ if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 1 ) )
+ {
+ if ( video != NULL )
+ {
+ mlt_deque_push_front( MLT_FRAME_IMAGE_STACK( temp ), producer_get_image );
+ mlt_deque_push_front( MLT_FRAME_IMAGE_STACK( temp ), video );
+ }
+ video = temp;
+ }
+ }
+
+ // Now stack callbacks
+ if ( audio != NULL )