Engine Noise w/ video

[991.8L]

Anyone have any insight on this noise I have on my 99 Mazda Protege 1.8L?

http://www.toprotege.com/forums/showthread.php?p=840515#post840515

 

[concept]

Is there any reason why you don't think it's the water pump bearing? That seems to be as good a guess as any, based on the sound.