coverting

I have a few UMD movie discs that I want to dump and then convert into AVI - is that even possible? I found this tutorial on UMD Ripping for 635 but not sure if it would work on 639 http://forums.dashhacks.com/f133/ripping-umds-to-memory-stick-using-umdumper-6-t283820/ Of course no idea how to...