[LINUX] How to use Fujifilm X-T3 as a webcam on Ubuntu 20.04

Summary

• The software "FUJIFILM X Webcam" for using Fujifilm X-T3 as a webcam is for Windows and Mac only, and Linux is not supported.
• I want to use Fujifilm X-T3 as a webcam even on Ubuntu 20.04, which I usually use.
• You can do it with Gphoto2 and ffmpeg, so the steps are summarized below.

setup

First install the required packages

sudo apt-get install gphoto2 v4l2loopback-utils v4l2loopback-dkms ffmpeg

Check the current / dev / video * after the installation is complete

ll /dev/video*

The hand environment is a notebook PC with a built-in camera and the following display

crw-rw----+ 1 root video 81,0 august 25 15:00 /dev/video0
crw-rw----+ 1 root video 81,1 August 25 15:00 /dev/video1

Then add a dummy video device

sudo modprobe v4l2loopback exclusive_caps=1 max_buffers=2

Check the number of the added device

ll /dev/video*

The following display in the hand environment

crw-rw----+ 1 root video 81,0 august 25 15:00 /dev/video0
crw-rw----+ 1 root video 81,1 August 25 15:00 /dev/video1
crw-rw----+ 1 root video 81,2 August 26 09:45 /dev/video2

Dummy device with / dev / video2 added. Use this later

Check the information of the added device

v4l2-ctl --device=/dev/video2 --info

Such a display at hand

Driver Info:
        Driver name      : v4l2 loopback
        Card type        : Dummy video device (0x0000)
        Bus info         : platform:v4l2loopback-000
        Driver version   : 5.4.44
        Capabilities     : 0x85208000
                Video Memory-to-Memory
                Read/Write
                Streaming
                Extended Pix Format
                Device Capabilities
        Device Caps      : 0x85208000
                Video Memory-to-Memory
                Read/Write
                Streaming
                Extended Pix Format
                Device Capabilities

Connect the X-T3 to your PC via USB and run the following to gphoto2 stream the video to standard output. Write raw video with ffmpeg to / dev / video2 in yuv420p format.

gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -f v4l2 /dev/video2

Now, if you launch zoom and select dummy device as the video device X-T3 Webcam completed

Finish

It is troublesome to type the following command every time, so finish it so that it will be executed automatically

sudo modprobe v4l2loopback exclusive_caps=1 max_buffers=2

Create a module called dslr-webcam and put it in the list you want to load

cat << 'EOS' >> /etc/modprobe.d/dslr-webcam.conf
# Module options for Video4Linux, needed for our DSLR Webcam
alias dslr-webcam v4l2loopback
options v4l2loopback exclusive_caps=1 max_buffers=2
EOS

echo "dslr-webcam" >> /etc/modules

Postscript

After rebooting, / dev / video0 was a Dummy device.

Check with the following command

v4l2-ctl --device=/dev/video0 --info

I can't remember the command every time I start capturing, so I created a fuji command.

cat << 'EOS' > ~/bin/fuji
gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0
EOS
chmod +x ~/bin/fuji

Even after rebooting again, / dev / video0 was a Dummy device, so it seems that dslr-webcam is loaded before the laptop camera in my environment.

It can be used as a webcam on zoom, but it is black on Skype. When using with Skype, change the scale referring to the URL below -vf scale = 1024: 567 and it's OK.

gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -vf scale=1024:567 -pix_fmt yuv420p -f v4l2 /dev/video0

https://answers.microsoft.com/en-us/skype/forum/all/video-feed-from-capture-device-elgato-cam-link-4k/e596fff6-c7df-49b8-8d25-e19b5235aea4

Reference material

https://medium.com/nerdery/dslr-webcam-setup-for-linux-9b6d1b79ae22