Nero makes image zoomed

Every video i burn with Nero 6 onto a DVD or VCD, the image is zoomed in when i view it in a dvd player and see it on TV. It is very annoying, all 4 sides of the video are chopped off by a little. This happens with everything i burn with Nero 6, what is the problem? what can i do? Is there a place where i could set the resolution?