Make movit_mix ignore empty "mix" parameter strings.

[mlt] / src / modules / opengl / transition_movit_mix.cpp

diff --git a/src/modules/opengl/transition_movit_mix.cpp b/src/modules/opengl/transition_movit_mix.cpp
index 4adc810e9dc7f83cc14ec9b09e138699d16a66f6..3e7ef964879c59faab70fb477508e4bd591428db 100644 (file)
--- a/src/modules/opengl/transition_movit_mix.cpp
+++ b/src/modules/opengl/transition_movit_mix.cpp
@@ -49,7 +49,8 @@ static int get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *form
        mlt_position position = mlt_transition_get_position( transition, a_frame );
        mlt_position length = mlt_transition_get_length( transition );
        int reverse = mlt_properties_get_int( properties, "reverse" );
-       double mix = mlt_properties_get( properties, "mix" ) ?
+       const char* mix_str = mlt_properties_get( properties, "mix" );
+       double mix = ( mix_str && strlen( mix_str ) > 0 ) ?
                mlt_properties_anim_get_double( properties, "mix", position, length ) :
                mlt_transition_get_progress( transition, a_frame );
        double inverse = 1.0 - mix;