index, mlt_frame_get_position(frame), mlt_deque_count( priv->queue ) );
frame->is_processing = 1;
mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( frame ) );
index, mlt_frame_get_position(frame), mlt_deque_count( priv->queue ) );
frame->is_processing = 1;
mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( frame ) );