Virtual camera output format not working with most applications on Linux

[knipknap]

Operating System Info

Ubuntu 20.10 Kernel: 5.11.0-11-lowlatency

OBS Studio Version

26.1.2

OBS Studio Log URL

https://gist.github.com/knipknap/bb3e23c2e1dc1b0259ad29ef78f69c7b

Expected Behavior

The camera should show up and be supported in applications such as Cheese, Zoom, and Cisco Webex.

Current Behavior

The camera starts up properly in VLC, but it doesn't show up in Zoom (in Chrome) or Webex, and it fails with an error ("There was an error playing video from the webcam") in Cheese.

Steps to Reproduce

1. Install OBS and v4l2loopback-dkms, reboot, start OBS, set Settings -> Video to 1280x720 + 30fps, click "Start virtual camera", and ensure that the camera works properly in VLC.
2. Start Zoom in Chrome: Observe that the virtual camera does not show up in the camera selection menu.
3. Start Cheese: Observe that the camera shows up (it only shows up if the mentioned settings of 1280x720 + 30fps were made; otherwise it doesn't even show up as a capture device).
4. Select OBS Virtual Camera
5. Note that it doesn't work, the error message in Cheese is "There was an error playing video from the webcam"

Anything else we should know?

Since the camera works in VLC (though only at 1280x720, not at 1920x1080), I am guessing that it has to do with color format configuration. However, I tried all available modes under Settings -> Advanced and none of them work with Cheese or Zoom. I found online recommendations to use YUY2 output, but didn't find this in the OBS settings.