Xvid is a free, open source codec developed by the computer programmers from all over the world. It has excellent compression feature. For example, the general DVD's capacity is 5GB, but after encoded by Xvid the size will be only 650 MB, one-eight as large as the original size but the image quality is evenly match with the original. So many organization and individuals use it to make thousands of the newest DVDRips with high video quality and put them to the internet.
How to rip/compress DVD to Xvid on Mac OS X?
There are many Mac DVD to Xvid conversion programs in the internet. In the all the Mac DVD software I've ever used, I think the iSkysoft DVD Ripper for Mac is the most easy-to-use and the fastest one. Furthermore, if your DVDs are encrypted by CSS or protected by region code, it is capable of copying the contents off discs to hard drive and then converting them to Xvid files.