On Fri, Mar 12, 2021 at 12:27 AM Ed Greshko <ed.greshko@xxxxxxxxxxx> wrote:
>
> >> You might try uvcdynctl that is what I have been using as it directly
> >> talks to the webcam.
> >>
> >> It will show the controls that exist and let you query and set them.
> >>
> > uvcdynctrl that is.
>
> FWIW, uvcdynctrl seems to return much the same info as does v4l2-ctl. At least for my capture device.
>
> [egreshko@meimei ~]$ uvcdynctrl -c
> Listing available controls for device video0:
> Brightness
> Contrast
> Saturation
> Hue
>
> [egreshko@meimei ~]$ v4l2-ctl -l
> brightness 0x00980900 (int) : min=-100 max=100 step=1 default=0 value=0
> contrast 0x00980901 (int) : min=50 max=200 step=1 default=100 value=100
> saturation 0x00980902 (int) : min=0 max=200 step=1 default=100 value=100
> hue 0x00980903 (int) : min=-90 max=90 step=1 default=0 value=0
>
> v4l2-ctl seems just a tad bit more user friendly since it returns the current value for the controls.
Thanks, Roger. Ed's suspicion has turned out to be pointing to the
right direction:
------------------------------------
# v4l2-ctl --list-devices
OBS Virtual Camera (platform:v4l2loopback-000):
/dev/video0
EasyCamera 5M: EasyCamera 5M (usb-0000:01:00.0-7):
/dev/video1
/dev/video2
/dev/media0
#
------------------------------------
The default camera is taken to be the virtual one. Thus, running the command:
v4l2-ctl -d /dev/video1 -c focus_auto=0
went fine!
Paul
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