Noises coming from front brake driver side when the wheel moving

At first I was thinking the noises are coming from the worn brake pad. So, I had changed it with the brand new one. However, the noises still there and I had tear the part down, clean it up and re-install it again, but problem still unresolved. Noticed that there is some grinding mark on the brake pad clip cause by the rotor (I believe the noises was coming from here). Is this sign of bad/ warped rotor (I dont feel vibration during braking anyway)? Could it because of bad wheel bearing? The noise will disappear for a while if I stop at a junction, put on my parking brake and release it.

Here is what the sound like, identical to the noise explained above, but not sure if we have the same problem.

http://www.youtube.com/watch?v=iSrJU8rt5fE