I have a lot of MPEG 2 files that are 720x480 128k/sec AC3 at 23 fps What is the best program to convert them to a DVD without having to re-encode them?
Try DVD Flick. Under 'Project Settings' > 'Video' > 'Advanced' there is a setting to copy compliant mpeg-2 without encoding. http://www.afterdawn.com/software/video_software/dvd_tools/dvd_flick.cfm