Author a DVD with what application?
For iDVD, just export a Quicktime Movie, self contained and import that into iDVD. it will compress it into the DVD format (mpeg-2) for you. DVD Studio Pro will also compress it for you, or you can use COMPRESSOR (on the same exported file) and choose one of the DVD presets. Quality will take time, Speed will lower resolution slightly, but encode faster.
www.shanerosseditor.com
Listen to THE EDIT BAY Podcast on iTunes
[
itunes.apple.com]