fix filters that need progress with region filter/transition

See for example, obscure filter, as used in demo/mlt_obscure.

diff --git a/src/modules/core/transition_region.c b/src/modules/core/transition_region.c
index 4486d23d0d72eb21fcfbe94bf615a5564a94f92c..97c3c4a2d67e54a61f6ee7bd706155b0007949eb 100644 (file)
--- a/src/modules/core/transition_region.c
+++ b/src/modules/core/transition_region.c
@@ -73,6 +73,7 @@ static int create_instance( mlt_transition this, char *name, char *value, int co
 
                // Pass all the key properties on the filter down
                mlt_properties_pass( MLT_FILTER_PROPERTIES( filter ), properties, key );
+               mlt_properties_pass_list( MLT_FILTER_PROPERTIES( filter ), properties, "in, out, length" );
 
                // Ensure that filter is assigned
                mlt_properties_set_data( properties, id, filter, 0, ( mlt_destructor )mlt_filter_close, NULL );