Unidentified Sound (video)

[njc242]

Hey guys, I have a problem with figuring out where this sound is coming from, any help will be greatly appreciated.

-It only happens when in motion under 20mph
-Its not consistant
-Coming from the front
-It sounds like something is clicking over

here is the link to the video it comes in at 3 seconds

http://www.youtube.com/watch?v=mo4bpAwiO08

[2010_5thgen]

couldnt really hear that good, but maybe your rotors are warped?