Ruby script to reset and start a DSLR or Mirrorless camera as a webcam using gphoto2, v4l2loopback, and ffmpeg

webcam

#!/usr/bin/env ruby
system("sudo modprobe -r v4l2loopback")
system("pkill gphoto")
system("sudo modprobe v4l2loopback exclusive_caps=1 max_buffers=2")
system("gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0")