Quote Originally Posted by Ghost_Mazal View Post
Thanx , works very good for single files. Now I just need to find an app that can do a whole dvd.

Tried avidemux , but same problem , can't set -vpre option

You will need to install some items like rar xvidconf and that. If you go to Debug -> Check Dependencies after it's installed, you can go to software center and search for that package or go to terminal and type in:
sudo apt-get install <package>
For example
sudo apt-get install rar