Audio from NDI Source inactive, when using two cameras

[daysailor]

Hi there,
I have connected two full NIDI PTZ cameras to OBS.
For each camera I have created a separate Scene with the according camera as the source.
The Video, PTZ Control etc. woks well, but in the audio mixer I only see one cameras audio.
In "Advanced Audio" I can see both cameras but just one is "active", the other is "inactive"
To make sure its not a problem of the camera, I created two new Scene Collections, each containing just one Scene.
In the Scene of the one Scene Collection I added Camera number one as the only source. (unplug the other)
In the Scene of the second Scene Selection I added Camera number two as the only source. (unplug the other)
Each camera in this single configuration mode produces a correct Audio Signal. It is also shown as active. So the cameras audio itself and the connectivity to OBS is working in general.
But - as already said - whenever I have two scenes with one camera source each, one cameras audio is always inactive.
Any ideas how to get this working would be very welcome.

Greetings from Germany
daysailor

 

[daysailor]

In the meantime, I found a solution (but not en explanation) for the issue.
I need to add always both cameras as a source in each scene.
But in the scene for camera one, source "camera one" on top of "camera two" an in the scene for "camera two" the other way round.
The Audio of both cameras appear then in the Audio Mixer Tab.
I still would be interesting in an explanation of what is going on there....

So long