Error when selecting akvcam virtual camera

[philippulus]

I have successfully installed akvcam and Linux-Fake-Background-Webcam on my Ubuntu 24.04 system with pipewire virtual environment.

This is how the config ini file look like:

[General]
default_frame=/etc/akvcam/config.jpg

[Cameras]
cameras/size = 2

cameras/1/type = output
cameras/1/mode = mmap, userptr, rw
cameras/1/description = Akvcam (Output device)
cameras/1/formats = 2

cameras/2/type = capture
cameras/2/mode = mmap, rw
cameras/2/description = Akvcam (Capture device)
cameras/2/formats = 1

[Formats]
formats/size = 2

formats/1/format = YUY2
formats/1/width = 1280
formats/1/height = 720
formats/1/fps = 30

formats/2/format = RGB24
formats/2/width = 1280
formats/2/height = 720
formats/2/fps = 30

[Connections]
connections/size = 1
connections/1/connection = 1:2

These are the video devices:

v4l2-ctl --list-devices
Akvcam (Output device) (platform:akvcam-2):
/dev/video2

Akvcam (Capture device) (platform:akvcam-3):
/dev/video3

HD Pro Webcam C920 (usb-0000:c4:00.3-2.1):
/dev/video0
/dev/video1
/dev/media0

This is how I am starting the camera:

Check Loaded Modules:
Verify that the Akvcam module is loaded by running:

lsmod | grep akvcam

If it is not listed, load it manually:

sudo modprobe akvcam

Activate the virtual environment:

source /opt/Linux-Fake-Background-Webcam/virtualenv/bin/activate

Configure and Run the Application:
Use the lfbw command to start the fake background application. You need to specify the input and output video devices:

lfbw -v /dev/video2 --background-image=/etc/akvcam/background.jpg --no-foreground

There are two problems here.

1. When selecting akvcam as a virtual camera in Cheese, an error message i displayed, that cannot be reverse after selecting back the physical camera. I need to unload akvcam (sudo rmmod akvcam), close and restart cheese for the camera to become activated again:
   

2. Background loading seems to be OK.
   
   Then this changes as shown as soon Cheese is started with the video signal from the physical camera.
   At this stage, I select akvcam in Cheese and loops back to 1. above.

Any idea where the issue is?

[fangfufu]

Have you tried v4l2loopback-dkms? For akvcam related issues, please ask around https://github.com/webcamoid/akvcam.