Converting DVDs To VCDs Under Unix?

This Curious Anonymous Coward asks: "There are many great apps running under others-buggy-OS to rip DVDs and to automatically convert the resulting MPEG to a less space-hungry resolution/bandwidth. These apps basically read the VOBs from the DVD, decrypt them, split audio and video and resample the resulting MPEG to a SVCD compliant resolution. Under Linux I found everything I need to do the same, except for the resampling step. Of course, I don't want to rip DVD I don't own, I just want to be able to burn SVCD to see my favourite movies on my laptop (with no DVD reader), and to delete the HD partition dedicated to the other-buggy-OS."