[Ffmpeg-user] Wide Characters

I'm trying to pass UTF-8 character strings to a stripped-down ffmpeg binary I built, but I can't seem to get av_open_input_file to work. This isn't too surprising, but I'm kind of at the end of my rope trying to figure out how to play with files that have non-latin characters in the name. Simply renaming the desired files isn't exactly suitable, unfortunately. Is there some kind of really obvious solution that I am missing? Thanks, Jon