Add 2 source audio in one camera

[eerison]

Hello,

Context

I have a camera like 3 meters high, and the sound is really low, I can't barely hear. And I do have other camera that could catch better audio.

What I want to achieve

I would like to have 1 cam with 2 audio mixed, would it be possible?

I was thinking something like this

cam2:
    rtsp://....

cam1:
    - rtsp://...
    - ffmpeg:cam1#audio=aac
    - ffmpeg:cam2#audio=copy 

[AlexxIT]

You should use exec source for with. With ffmpeg command inside with two inputs and one output. I don't have example.