Record left monitor from CLI

record_left_monitor.zsh

# Oh-My-ZSH custom function to record left monitor from CLI.
# 
# Place in $ZSH/.oh-my-zsh/custom.
#
# Two monitors at screen 0, the left one connected at DP-1:
#
#     xrandr 
#     Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 16384 x 16384
#     DP-1 connected primary 1920x1200+1920+0 (normal left inverted right x axis y axis) 518mm x 324mm
#       1920x1200     59.95*+
#
# You may have to adjust "-s 1920x1200", depending on your setup.

record_left_monitor() {
	o=/tmp/screen_recording_$(date +"%Y%m%dH%H%M%S").mp4
	echo "Recording to ${o}."
	echo "Press CTRL+c to quit."
	ffmpeg \
	  -f x11grab \
	  -s 1920x1200  \
	  -r 25 \
	  -i :0.0 \
	  -qscale 0 \
	  "${o}"
  echo "Wrote ${o}, bye."
}