transition_mix.c: prevent serializing previous_mix and reset previous_mix on seeking.

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@1223 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/modules/core/transition_mix.c b/src/modules/core/transition_mix.c
index d3bad10..b2b3790 100644 (file)
--- a/src/modules/core/transition_mix.c
+++ b/src/modules/core/transition_mix.c
@@ -104,14 +104,17 @@ static mlt_frame transition_process( mlt_transition this, mlt_frame a_frame, mlt
                        mlt_properties_set_double( b_props, "audio.mix", mix );
        
                        // Initialise transition previous mix value to prevent an inadvertant jump from 0
-                       if ( mlt_properties_get( properties, "previous_mix" ) == NULL )
-                               mlt_properties_set_double( properties, "previous_mix", mlt_properties_get_double( b_props, "audio.mix" ) );
+                       mlt_position last_position = mlt_properties_get_position( properties, "_last_position" );
+                       mlt_position current_position = mlt_frame_get_position( b_frame );
+                       if ( mlt_properties_get( properties, "_previous_mix" ) == NULL
+                            || current_position != last_position + 1 )
+                               mlt_properties_set_double( properties, "_previous_mix", mix );
                                
                        // Tell b frame what the previous mix level was
-                       mlt_properties_set_double( b_props, "audio.previous_mix", mlt_properties_get_double( properties, "previous_mix" ) );
+                       mlt_properties_set_double( b_props, "audio.previous_mix", mlt_properties_get_double( properties, "_previous_mix" ) );
 
                        // Save the current mix level for the next iteration
-                       mlt_properties_set_double( properties, "previous_mix", mlt_properties_get_double( b_props, "audio.mix" ) );
+                       mlt_properties_set_double( properties, "_previous_mix", mlt_properties_get_double( b_props, "audio.mix" ) );
                
                        mlt_properties_set_double( b_props, "audio.reverse", mlt_properties_get_double( properties, "reverse" ) );
                }