Raspberry PI camera issue with AppArmor

Ant1

Hello !

I am writing a plugin that uses a raspberry PI camera to calibrate print heads. I encounter an issue where the camera won't start when constructing the camera object:

from picamera2 import PiCamera2
cam = Picamera2()

Returns the following error:
[0:32:17.478523088] [4325]  INFO Camera camera.cpp:990 Pipeline handler in use by another process
Camera __init__ sequence did not complete.

I am pretty sure that this issue is due to the apparmor configuration because if I run the exact same script from another folder on the raspberry PI, I don't get any errors...

Do you have any experience using a Raspberry PI camera from the plugins ?

Thanks for your help !

chrishamm

@Ant1 Did you add webcamAccess to your plugin privileges (see here)? Note that you need v3.5 and ideally the latest DuetPi image based on Debian Bookworm to access the new Pi webcam interface. It does work with the Spyglass webcam server plugin on Bookworm and with 3.5.

Ant1

@chrishamm Thanks a lot, that was the problem ! I was looking at an old documentation page that didn't show that this permission was possible... Thank you !