International characters on UDF-FS

Hi, I'm trying to back up a load of files with French and German characters in their names to a udf filesystem on a CD-RW. Every time I try to add a file with an accented character, though, I just get "udf: bad UTF-8 character" recorded in the system log, and no file is created. Short of using ext2 instead of udf for the CD, is there any way of fixing this? I've tried specifying --u16 or --u8 when running mkudffs, but it makes no difference. I'm currently running stock kernel 2.4.20. Stephen