If they can be compressed enough to fit on one disk, you should be able to compress and combine them in one shot from nero recode (skip dvd shrink). Open nero start smart. Find the icon that says "copy multiple dvd-video movies to one" button and click it. Click import titles, find your first video_ts folder. If this is just a single movie, it should show just one title. Import it, then go to the folder of your second movie and do the same. I'm really not sure what it does with the menus (never done it before), but that should combine and compress two movies onto one disk, asuming they can be compressed far enough to fit.