Fix regression in field rendering luma transition.

[mlt] / src / modules / core / transition_composite.c

diff --git a/src/modules/core/transition_composite.c b/src/modules/core/transition_composite.c
index 9cb37f02081daa1b7099bf3a904b1ceaaae7b23b..f69ee2ff051064fb6db22941c61be9af26ac001a 100644 (file)
--- a/src/modules/core/transition_composite.c
+++ b/src/modules/core/transition_composite.c
@@ -1120,6 +1120,7 @@ static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_f
 
                // Calculate the position
                double delta = mlt_transition_get_progress_delta( this, a_frame );
+               mlt_position length = mlt_transition_get_length( this );
 
                // Get the image from the b frame
                uint8_t *image_b = NULL;
@@ -1233,7 +1234,7 @@ static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_f
                        for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
                        {
                                // Assume lower field (0) first
-                               double field_position = position + field * delta;
+                               double field_position = position + field * delta * length;
                                
                                // Do the calculation if we need to
                                // NB: Locks needed here since the properties are being modified