#!/bin/sh

idiff() {
	ffmpeg -i /tmp/screen.png -pattern_type glob -i 'i*.png' -filter_complex '[1]boxblur=1[m];[0][m]blend=all_mode=grainextract' o%03d.png
}

tile() {
	montage -background black -geometry 683x o*.png m.png
}

mkdir -p /tmp/obv
cd /tmp/obv

idiff
tile

while inotifywait -e close_write /tmp/screen.png
do
	sleep 0.1
	idiff
	tile
done