s = trackname_part(argv[optind], argv[optind+1], argv[optind+2]);
if(!s) fatal(0, "trackname_part returned NULL");
xprintf("%s\n", nullcheck(utf82mb(s)));
s = trackname_part(argv[optind], argv[optind+1], argv[optind+2]);
if(!s) fatal(0, "trackname_part returned NULL");
xprintf("%s\n", nullcheck(utf82mb(s)));