Thank you John. That did work. And you were right about the hugeness – 10 seconds used 2 gigs and my film is 6 minutes long so that will mean a 36 gig file.
I will send a 2 second render to the people who run the Barco Folsom Encore at the venue and see what they say.
But when you add that the Sony YUV is an intermediate codec, do you suggest that I try to move my 36 gig file over to some other format after rendering? Or is there another hi-quality codec that would give a smaller file?