catrielmuller/README.md

## README.md

      
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              README.md
            
          
    ArchLinux ElGato FaceCam - Chrome V4L2Loopback

IMPORTANT

This is not required any more, you need upgrade your firmware to the version +4.09 using ElGato Cammera Hub
https://help.elgato.com/hc/en-us/articles/4406041241997-Elgato-Facecam-Firmware-Update
Changes in firmware 4.09


Added MJPEG as a fallback video format. MJPEG requires less USB bandwidth and improves compatibility with programs that cannot handle uncompressed video.

Loopback Config

I'm creating 3 Loopback devices, if you only need do this for the Facecam you can define only one like this:
options v4l2loopback video_nr=11 card_label="ElGato FaceCam"

WebCam Path

I'm using my serial as a path to not conflict with my another input devices /dev/v4l/by-id/usb-Elgato_Elgato_Facecam_FW42K1A07115-video-index0 on the facecam-init.sh.
You can check what is your correct path with this command:
ls /dev/v4l/by-id/

WebCam Config

On my facecam-init.sh, I set some parameters that make sense for my enviroment, this maybe cannot fit for you, so you can remove this line.
v4l2-ctl -d /dev/v4l/by-id/usb-Elgato_Elgato_Facecam_FW42K1A07115-video-index0 --set-ctrl="brightness=180,contrast=3,saturation=35,white_balance_temperature_auto=1,power_line_frequency=2,sharpness=1,exposure_auto=2,zoom_absolute=5"

or adjust the parameters that you want.
Run

You need start the script to create the pipe from the FaceCam Device to the LoopBack Virtual Device

Add execution permissions:

chmod +x facecam-init.sh


Run

./facecam-init.sh


## facecam-init.sh
#!/bin/bash

v4l2-ctl -d /dev/v4l/by-id/usb-Elgato_Elgato_Facecam_FW42K1A07115-video-index0 --set-ctrl="brightness=180,contrast=3,saturation=35,white_balance_temperature_auto=1,power_line_frequency=2,sharpness=1,exposure_auto=2,zoom_absolute=5"

ffmpeg -f v4l2 -input_format uyvy422 -framerate 60 -video_size 1920x1080 -i /dev/v4l/by-id/usb-Elgato_Elgato_Facecam_FW42K1A07115-video-index0 -pix_fmt yuyv422 -f v4l2 /dev/video11

## module.conf
# /etc/modules-load.d/v4l2loopback.conf
v4l2loopback

## options.conf
# /etc/modprobe.d/v4l2loopback.conf
options v4l2loopback video_nr=10,11,12 card_label="OBS Virtual","ElGato FaceCam","V4L2Loopback" exclusive_caps=1,1,1
	#!/bin/bash

	v4l2-ctl -d /dev/v4l/by-id/usb-Elgato_Elgato_Facecam_FW42K1A07115-video-index0 --set-ctrl="brightness=180,contrast=3,saturation=35,white_balance_temperature_auto=1,power_line_frequency=2,sharpness=1,exposure_auto=2,zoom_absolute=5"

	ffmpeg -f v4l2 -input_format uyvy422 -framerate 60 -video_size 1920x1080 -i /dev/v4l/by-id/usb-Elgato_Elgato_Facecam_FW42K1A07115-video-index0 -pix_fmt yuyv422 -f v4l2 /dev/video11
	# /etc/modprobe.d/v4l2loopback.conf
	options v4l2loopback video_nr=10,11,12 card_label="OBS Virtual","ElGato FaceCam","V4L2Loopback" exclusive_caps=1,1,1