Oh BTW make sure the folder you burn has both an AUDIO_TS folder as well as a VIDEO_TS folder. The audio folder is always empty so if yours doesn't have one you can simply add it manually. I think this is required via dvd specifications however i have come across a few commercial ones that didn't have it.
Also check what your set-top player can play. I am aware some well-known brands of players will only allow their own brands of dvd-r/rw to be playable. Which sucks! lol Mine cost a third/quarter of price yet does all the more expensive ones can do plus it's not dvd media fussy.