If you’re only output format is SD DVD, I’d leave the project at SD. Because of the higher resolution, you can actually zoom in and pan the footage without losing any quality.
If you’re wanting both HD and SD output, set up the project as HD, edit as needed, and then do a final SD render for that part.
You can change the project settings mid project but you may need to do some adjustments so that everything properly matches.
Edward Troxel
