Cameras black, Keyboard stutters, too many devices?

[Philthebill]

I have an issue using OBS. When I startup the system, a few cams are black and even if I try to reconnect, they don't show an image. It worked well at the beginning, but I reconnected the cams (maybe I changed the USB Ports of the devices) and now I can't get it to work anymore.

While the windows camera app !mostly! shows the images of all the cams, OBS doesn't. But the windows camera app has problems aswell. (error code 0xA00F4271<MediaCaptureFailedEvent> (0x8007001F).

Maybe it is because of power support for too many devices (List below). So I tried to use an USB Hub with external power source (36w/3A/12V) to cover at least the power support of a few devices (The 3 Webcams and Mouse & Keyboard). My keyboard was aswell really slow reacting and missing more letters, than it actually typed. Since I plugged it into the hub aswell, its working normal again. But the cameras still won't.

Computer:
Intel NUC 11th Gen 16GB DDR4, i7 11th. Tiger Lake, RTX 2060.
It has 6 USB 3.2 Ports and 2 USB-C/Thunderbolt 4 ports.

Devices:
2xUSB-C powered screens (5v/3A power supply regarding the manual)
3xLogitech C920
1xCamLink4k
1xUSB-Table Microphone
1xRapoo keyboard & mouse
1x Elgato Stream Deck

OS:
Win11

What I already tried is to deinstall the logitech software. Drivers are generic, not the logitech ones (because I heard that there are Issues with the

Maybe someone has a few Ideas what I can try else.

 

[Philthebill]

What I tried else so far:

Disconnecting the USB-C screens:
No difference

Disconnecting everything except mouse and 3 cams:
No difference

Changing the USB Ports:
No significant difference. One or two cams still don't work.

Connecting 1, 2 or 3 cams to the hub and the rest straight to the pc:
No difference.

Changing the user:
In my other user they worked, but there OBS was "fresh".

 

[deFrisselle]

Are all the devices recognized by Windows Check device manager
Could be you are running up against the USB bus data throughput limit the way you have them hooked up

This utility may help by showing USB devices and data transfer

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[Philthebill]

Are all the devices recognized by Windows Check device manager

Yes!

Could be you are running up against the USB bus data throughput limit the way you have them hooked up

Data shouldn't be the problem. The cameras are only HD, the screens aswell, and the two microphones aren't the Problem aswell... Imagine having one single 4k Monitor on thunderbolt and one 4k Cam on usb, that should work flawlessly and is more traffic than my HD Devices.

This utility may help by showing USB devices and data transfer

I will try that.