read the page here:
http://www.ratdvd.dk/dvd_to_ratdvd.htm
and the FAQ:
http://www.ratdvd.dk/faq.htm#VideoCodec
the only special thing about this program/format is that it keeps the dvd structure and is able to recreate it on decompression.
it would transcode the source 2x (1. compress, 2. "decompress")
it's not worth using.
later