Is this rod knock?

[frenetic]

Link to video. What is this sound? It sat for 3 months, noise is not noticeable inside the car and it runs fine, I drove it around the block, but obviously this is a big concern. I am thinking it's just low on oil, the oil seemed really thin on the dipstick etc. I did not have time to throw oil in it though. Thanks

http://www.youtube.com/watch?v=u_NmX7LANyQ

I did some research on rod knock and saw a few of the videos people have posted.. seems like the sign of rod knock is the knock getting worse when you rev it. This is a rather consistent sound through revs... I am really hoping it's just chain rattle. Any ideas?
Modified by frenetic at 6:42 PM 10/4/2009