[Tom Hoffman]"I've done a custom sized 5 second video to be played on a big screen at a football stadium... How should I output it from After Effects?"
If this DVD is the kind that plays in a DVD player, you'll need to author a DVD. DVDs can only play mpeg2 video files. But you DON'T want AE to render the mpeg2. AE is incapable of multipass encoding, which really makes a difference.
Instead, render a high-quality file out of AE, then use something else to convert it to mpeg2. Even the DVD authoring software is bound to have a better mpeg2 encoder than AE. And since it's only :05, you might as well get the best image quality you can, right?
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA