we know movies of dvd disk contents several "vob" files as its media stream. but it's too large to storage on pc disk. and avi video is some better, it has hight quality and it's smaller...
[The Software]
i recommended is "VirtualDubMod",it's free ,and more powerful.
search it at "www.google.com",maybe you can download one.
else you can mail me for a copy:ami387@gmail.com;
[The Methods]
1.install VirtualDubMod.
2.copy you vobs to a disk or directly use the dvd-rom
3.open VirtualDubMod, Then **** "files"->"open video file...", select one of your vob file
4.**** "save as", select "avi" fomated, and change to compression to "Xvid",when at here,you can set the Xvid's rate,and not usually it'll be "900-1500kbps".
5.**** "ok",wait for your avi video.