I would tell you if I knew, but I've never personally burnt a DVD Video using it.
Nero 6 wasn't too bad when I used it, but Nero 7 literally just froze up on me one day when burning. So I tried my other drive and it froze that one too, so both drives were locked up. I had enough of that, restarted, uninstalled, restarted again. Now I had no sound in some applications (stuff like Flash) and was unable to control the volume through things such as my keyboard.
It made it such a pain to watch a video on the web, I had to download each video using KeepVid and watch it in MPC just to be able to hear the sound. Nothing I did fixed the problem, short of when I installed a new OS on it.