Unsorted
Vitual Camera
sudo modprobe -r v4l2loopback
sudo modprobe v4l2loopback devices=1 video_nr=21 exclusive_caps=1 card_label="Virtual Webcam"
v4l2-ctl --list-devices
ffmpeg -re -i ~/Downloads/example.mp4 -f v4l2 /dev/video21
sudo modprobe -r v4l2loopback
sudo modprobe v4l2loopback devices=1 video_nr=21 exclusive_caps=1 card_label="Virtual Webcam"
v4l2-ctl --list-devices
ffmpeg -re -i ~/Downloads/example.mp4 -f v4l2 /dev/video21