2014 Mirage ES Whining

[Nifty_Biscuit]

I've taken my car to a few local mechanics and had a few belts replaced, but non seem to be able to fix my issue. These problems have been present since I bought the car in Jan 2019. I'm hoping a collection of mirage enthusiasts like yourselves will know something they do not, and to learn more about my car in the process.

My car, a 2014 Mirage ES, 4dr Hatchback 5M, squeals/whines seemingly at random but there is a pattern (More Below). It can almost be described a a warble, like a bird, but a really annoying and ugly bird. I also experience a jerking motion during some accelerations, from light bumping to violent head bobbing.

The whining varies in volume depending on the temperatures outside, the weather, rpm, and if the A/C is off or on.

The whining is most present on hot days, dry days, and cold humid days (not cold rainy days, yes on hot rainy days)
Turning the A/C on makes it louder, or on days when the whining is not present it makes it present
It is present when idling (loud), and the volume scales between 1000(whine) and 2000(squeals) rpm (1500 to 2500 with the AC on) getting louder with higher rpm
It stops at rpms over 2000 (2500 with the AC on)
If I put the car in park it gets quieter
On days with low to no whine, I experience the jerking issues mentioned above. Can't think of a day I have had both issues at once.

It comes from the engine compartment, I have heard it with the hood open and the car idling. Front brakes are brand new.

I will try to record audio if I can today.

Edit: I ordered the belt 6pk1240 today, and will install it as soon as I can. Until then, here is a video I took of the engine while idling in park with the AC on.
https://youtu.be/ajsyqWKDI9M
Thank you all for your help! I'll update yall if it fixes it or not, hopefully soon.

Edit: I replaced the belt with the 6pk1240 and so far I have had better performance and no squealing, on the two drives I have taken since. I compared the old and new belts and they appear to be the same size and they both have six ribs, so I'm not sure what the issue with the last belt was. I have a new rattling noise that was either not there or was masked, sounds exactly like Fummins' engine down below. I couldn't "tune" the belt (I am tone-deaf) but I followed the 45-degree rule. I guess the mechanics around here are just using ****ty belts? Lmao