Noise/rough idle when clutch pressed in

Hello everybody,

I am having issues when I press my clutch in. A noise similar to a loose belt starts to happen after pressed, the idle will fluctuate and sometimes bad enough to cut off the car. The car will be fine during shifting, the sound only exists when slowing down using the clutch, or when the car is stopped and taking off in first. As soon as the right rpm is met, the sound goes away.

Here is a link to a video I took of the noise, you can notice the rough idle as well.

Does anybody have any thoughts of what this could be? I did notice the brake fluid was about an inch and half below the max line.