[mythtv-users] Are Custom DVD Import formats possible?

[Xamindar]

I just got MythDVD working and would like to use it to encode my dvds 
into a small format (like 320x240 divx or mpeg4) for use on my Zaurus 
PDA.  Is it easy to set up a custom format in mythtv?  Is it in setup 
somewhere or do I have to edit some file?  Thanks for any help!