c920 powerline frequency setting
Posted: Tue May 14, 2019 1:11 pm
I just got around to looking at the flickering I was seeing on the c920 in Linux and it turned out to be an easy fix.
There is a power line frequency setting in the camera that defaults to 60Hz that with my lighting and walls ends up looking pretty bad. Figure changing this might be handy for other users and the Portsdown too, it doesn't survive a reboot so will need set on startup.
You can view the current setting selecting the correct video device:
"power_line_frequency" set to 1 selects 50Hz, while set to 2 (default) it is 60Hz.
It is easy to change with:
The following video shows changing between the two on a Portsdown TX with the c920 in webcam mode starting off on the default 60Hz.
https://youtu.be/wvam7bu9Bz8
There is a power line frequency setting in the camera that defaults to 60Hz that with my lighting and walls ends up looking pretty bad. Figure changing this might be handy for other users and the Portsdown too, it doesn't survive a reboot so will need set on startup.
You can view the current setting selecting the correct video device:
Code: Select all
v4l2-ctl -d /dev/video0 --all| grep freq
power_line_frequency (menu) : min=0 max=2 default=2 value=2It is easy to change with:
Code: Select all
v4l2-ctl -d /dev/video0 --set-ctrl power_line_frequency=1
https://youtu.be/wvam7bu9Bz8