Posts made by zhiyongwoo

@ajb2k3
If not mistaken, the CM4Stack is using CM4 module and have its own extension circuit diagram.

I didn't do as I follow exactly what the document asked to do.

I do have another CM4 module that connected 3rd party extension board where it gave me 4 USB ports and follow the guidance from the RPI official setup document. It is able to stream both USB camera at the same time even I have both cameras connected to an external USB3.0 hub. It doesn't report such issues.

On the CM4Stack:
And I want to highlight is, I can have 2 camera stream together ONLY if I have 1 connected to USB 3.2 port and 1 connected to USB 2.0

So I suspect something I need to enable in Kernel level or the hardware limitation?

I am unable to stream 2 cameras on the same USB3.2 with the following error message:
"libv4l2: error turning on stream: No space left on device Unable to start capture: No space left on device"

But When I have 1 USB camera connected to USB2.0 (using USB hub) then it works.

Then we try to have both cameras connected to USB2.0 (via USB hub) , same above problem occurred.

It seems like it only can have 1 USB camera at 1 USB controller stream per session.

I have tested on other Raspberry Pi 4 and 5, they don't seems to have such issues even with both cameras on a single usb hub.