I need a simple script that can change my webcam settings. I want the changes to be applied globally, just like with guvcview. Most importantly, I want to be able to turn on the auto exposure setting.
I have checked the man page and I don't think guvcview allows that from CLI.
From @Jezor comment above and the linked tutorial.
Installing the v4l-utils or v4l2-utils (depending on your distro) provides the v4l2-ctl tool that defaults to using /dev/video0
Running
v4l2-ctl --list-ctrls
will list all the settings that can be changed along with their min, max and current values.
you can then set these values with the --set-ctrl command e.g.
v4l2-ctl --set-ctrl contrast=40
v4l2-ctl --set-ctrl brightness=100
v4l2-ctl --set-ctrl saturation=80
These were run on a laptop with built in webcam during a Teams video call using Google Chrome and the camera feed was updated instantly.
To use a different video device pass the --device option e.g.
v4l2-ctl -d /dev/video3 --list-ctrls
v4lctl, which is part of thexawtvpackage.