As far as the libav port of UTVideo goes, it's in the works, but I still have no idea how this symbol length magic works so I don't see the encoder for that happening any time soon. AFAIK there isn't a QT Component for lavc either anyway.
Either way, further information at the readme, most relevant is the supported formats block:
http://umezawa.dyndns.info/archive/utvi ... me.en.html
[MOD258: Put old v10 links under spoiler.]