mlt_properties properties = mlt_filter_properties( this );
mlt_filter_init( this, NULL );
this->process = filter_process;
- mlt_properties_set( properties, "start", "40,40:20x20" );
+ mlt_properties_set( properties, "start", arg != NULL ? arg : "0,0:100x100" );
mlt_properties_set( properties, "end", "" );
return this;
}