(VIDEO) Recognize this whiney noise?

Faint little squeaky or whiney noise coming from under the Jeep.

I usually notice it when I'm parking the Jeep at home. Perhaps because there is a wall that reflects the noise back to me.
But this past weekend we were up in the mountains and in one of the video clips I noticed the noise again.

There is no shortage of Jeeps making strange noises videos and posts, but none of the ones I came across were the same as mine.
Not to say I watched or read all of them.

I don't find the noise to be overly bothersome, but I don't want to be ignoring something that I shouldn't be.
Just wondering if anybody knows what might be causing it and how to go about fixing it.

Could be your idler pulley.
Take off your serpentine belt, remove the idler pulley and check if it "rolls" rough or noisy.
The bearing cover is removable, take off the cover, clean and regrease.

Thanks BumblebeeZA.
I'll have a look.