I've been trying to fathom this all day!
Here is a thread and it seems that it is possible
I'm new to this, but it seems that the first thing to do is to get your DVD into the correct format. I'm currently trying with this click here
I use clone DVD to backup my DVDs and it works a treat, so am trying the mobile version to convert to the TX. There is a 21 day free trial (You also need to download ANYDVD, so isnt cheap). I dont have an SD card large enough so wont be able to report back on progress until it arrives via ebyer's cheapest delivery option. As soon as I have, I'll post back.
If you manage to get the TX to play video would really appreciate a post on it.