Royalty Free AV Data for Benchmarking?

Foredecker asks: "I'm developing some audio and video encoding benchmarks. (yes, they will be open source), and I need royalty free high quality audio and video. Unfortunately, I can't simply rip CD's and DVD's for distribution. I need to distribute the content with the benchmark to provide a consistent data set. I'd like both stereo and 5:1 audio and regular and high-def video. Anyone have any ideas where I can get such content?"