Update: both rear calipers seized and the pads were dragging on the rotors. One of them was worn down almost to the backing plate which was causing the noise.
I have a squealing noise coming from the front of the car while driving:
It happens while driving on a smooth road as you can see in the video, and it stops immediately when I brake, even slightly.
I do have a bad ball joint boot and I'll be replacing that, but it feels like this noise here could be something else - I'd think the ball joint would clunk or squeak when going over bumps, whereas this is constant and corresponds directly to wheel rotation speed.
Could it just be the brake wear indicator? Or maybe something like wheel bearings?