I have XP and want to backup 2 full DVD movies onto one disk. I know how to compress them so they fit but I always get a message saying something is wrong with my IFO file. i guess I need to edit it as only 1 of the 2 DVD IFO files will fit in the directory so it confuses it. How? I heard od IFOedit but it dosent work on XP so I didnt bother to find out how it works!
You could load both movies into TMPGEnc DVD Author and create a new menu and IFo files for both. Check out the user guide in my signature.