Ha! I hadn't seen the video!
Hmmm... I saw it and first glance it seems like an exhaust leak to me, then I scrolled down to the comments section and saw somebody else had the same idea. Is the noise changing as temperature rises?
I'm sorry, I've never heard a bad rod baring so I can't comment any further about it. I'm pretty sure tempfixit will give you great advise about it!
Oscar.