Hi, remember if you are doing a hour long movie, you would seperate it into scenes, rendering say 10 min at a time. If you look at any dvd there is rarely 1 large file, normaly several scenes that join together or can be accessed from a menu. You are looking at about 15gig of raw avi. Thats a lot for any vid edit to handle in one go.
As for oss, try out a few and see which suits your workflow and works best with your system.
To produce or have produced for you a hour long video can be time consuming and with the wrong software, heartbreaking too.
I would find out locally what a pro video maker would charge for the same thing. Then unless you are doing this as a freebee, ask your client for an advance and buy Sony Vegas. Sorry, not oss, but it is stable, professional software that will nearly cover all your needs in video editing. Sony didn’t fork out $$$$ to buy out the sonic foundry suite for nothing.