How to set up files to stream from Amazon S3?

OK, I feel silly asking this, but how does one set up video files to stream properly from an S3 bucket? I have the bucket set up and I can easily call HTML and images from the browser (as a test), but a request for video does nothing. I've set it as a website, and I've set permissions so that everyone has view access. Is there some magical incantation I need to do to make video work?

Thanks!

---- Nick