I have created my first movie in imovie. I burned it using idvd. When I played it back with my dvd player on my tv, the format was too large. The sides of the image were cut off and everyone appeared fatter than normal. Where do I find the option to choose a format so I can show my dvd on a regular tv (4 by 3 format)or a wide screen (16 by 9 format) tv?