I need advice on making my videos widescreen for dvd and television use without it looking letterboxed. I have so far been using prism to convert my mp4 widescreen 1080p. HD files into .avi by selecting 1920 width and 1080 height 16:9 option output. it comes out letterboxed when i open it up in windows movie maker as well as videopad editor. when im done editing a clip i select again 16:9 1920x1080p options but again th eproduct is boxed in. I had a friend convert my video to dvd once and it was filling my screen- but when i use dvd flick and .img burner it always comes out letterboxed. with all of these products the preview looks letterboxed from the start. what should i be using instead.