* \param input an optional argument to the service constructor
*/
-void *mlt_repository_create( mlt_repository this, mlt_profile profile, mlt_service_type type, const char *service, void *input )
+void *mlt_repository_create( mlt_repository this, mlt_profile profile, mlt_service_type type, const char *service, const void *input )
{
mlt_properties properties = get_service_properties( this, type, service );
if ( properties != NULL )