static void onClose( mlt_properties owner, GlslManager* filter );
static void onServiceChanged( mlt_properties owner, mlt_service service );
static void onPropertyChanged( mlt_properties owner, mlt_service service, const char* property );
static void onClose( mlt_properties owner, GlslManager* filter );
static void onServiceChanged( mlt_properties owner, mlt_service service );
static void onPropertyChanged( mlt_properties owner, mlt_service service, const char* property );