u/Additional-Feed5824

Can anyone tell me what might be wrong with my brakes? I got them replaced back in November, but a couple of months later they started making the noise you hear in the video. I took the car back to the mechanic some time later, and he told me everything looked fine. He even brought me out to the car to show me the brakes were still in good condition. When I drove him around, he said he couldn’t hear the noise. I usually drive with the windows down and I can only hear it on my front passenger.
Now, a few months later, the sound has become louder and happens much more often. I tried looking up possible causes before taking it back again. Thanks in advance for any help or advice!