mlt_log_debug( MLT_FILTER_SERVICE(filter), "%dx%d -> %dx%d\n", *width, *height, owidth, oheight);
GlslManager::get_instance()->lock_service( frame );
mlt_log_debug( MLT_FILTER_SERVICE(filter), "%dx%d -> %dx%d\n", *width, *height, owidth, oheight);
GlslManager::get_instance()->lock_service( frame );