Module v4l2src() reported: Failed to allocate required memory.

[mattjes]

Hello, when I try to open the camera I get the following message: (see image)

I am on rpi 4b with 8 gb ram and the csi v2 pi camera.

I have tried using

$ python3 $ import cv2 $ cam = cv2.VideoCapture(0)

Which gives the same error.

However it works perfectly fine when I use
cam = cv2.VideoCapture(cv2.CAP_V4L2)

So to me it seems this is some issue with openCV. However I figured I might be able to work around this by simply changing some code in bCNC.

So I found this
self.camera = cv.VideoCapture(self.idx)

It appears pass a variabele idx defined as
self.idx = Utils.getInt("Camera", prefix)
In utils I found this function basically gets the "Camera" input from the config.

In the config I don't find any single camera = entry. There is a [Camera] section tho. But it only contains aligncam_xxx entrys. Which don't seem to have anything to do with this.

So I wonder. Is it save to replace the self.idx with cv2.CAP_V4L2 ?

Also I have never used python before. Since I need to use the python command to launch a "module", I have gotten the impression that python program is not compiled. Can I edit this locally? If so, what is the default installation directory? Or do I need to fork the github and install it somehow from my own source then?

Or if you know how to fix this on opencv side I am very open for suggestions.

Thanks in advance for any help.

[mattjes]

So I looked up the content of CAP_V4L2 and its 200. So I tried to put 200 in the "align camera" field. When I press open camera it gives no error anymore. It doesn't show anything either.