gday mate, where the bloody hell are ya!!!
enough aussie lingo.
i use aviraw to split my avi into separate colour r,g,b. from there I convert those separate r.g.b avis into bmps with bink and smacker. virtual dub would work too.
ppmcentre then crops and centres the bmps and does a pre quality sort if needed.
then into registax.
Mike (Iceman) has a script setup where he converts first from avi to bmps via virtual dub and then runs the script to convert bmps into split colours and then also run ppmcente.
My dos is not great, so i have not had a chance to do the same thing via scripts.
aviraw is the first step i would think. The only quirk is that the program needs you to convert to a rgb first or convert a raw in to a rgb first before trying to split the avi's into colours.
http://arnholm.org/astro/software/aviraw/
come back and ask any questions at any time, the lights are always on in australia, the country that never sleeps!