firefox: cannot access v4l2loopback device (private-dev)

[gcb]

I'm trying to expose a v4l2loopback device from OBS to firefox.

OBS is kinda weird as it works if I have one device, and fails if I have 2+.

Firefox doesn't work.

If I start both without firejail, everything works.

File /dev/video9 is the device file I'm using.

Relates to:

• Use wildcards for handling paths in /dev #2723

[gcb]

After testing with both applications without firejail, now it also works when using firejail... will debug some more. But apparently, it all works.

[rusty-snake]

If /dev/video9 is created after you started firefox, it will not appear. Add ignore private-dev if you need plug 'n' play.

[gcb]

Thanks. It works but required learning one weird thing...

I set up everything before starting firefox, as you said, but then must request access to the camera API using a camera that is NOT a v4l2loopback device. After that request to the device that is v4l2loopback device will work and firefox will show the permission with the video9 Name. If I try that device i know is the video9 as the first one, i never get the permission request. None of this happens without firejail.

I will try more with ignore private-dev