Is there some trick to reduce background noise?

[algojea]

Firstly, thank you very much for this awesome framework.

I have successfully developed multiple features with BBMetalImage: video recording, photo editor, video editor... and everything is working like a charm. But I have noticed that recorded videos have annoying background noise, not only in my app, also in your demo project.

I have compared two videos:
Video 1 - Video recorded with BBMetalImage
Video 2 - Video recorded with iPhone native camera.
The background noise is present in both videos, but in "Video 1" is louder and a little bit annoying.

Is there some trick to reduce background noise? I've been testing with:
iPhone 11 Pro - iOS 14.2
iPhone 6 - iOS 12.4.9

Thank you very much.