create a slitscan image of 36 seconds of 1080 video

mog.sh

#!/bin/bash
# http://cameronbrowning.com/content/creating-slit-scan-images-from-quicktime-movies-with-ffmpeg-on-mac-os-x/
# loop through 1080 images
for i in `seq 1 1080`;
do
	# subtract 1 from the counter for the y offset
	mycmd=$(printf "mogrify -crop 1920x1+0+%d image-%04d.jpg\n" `expr "$i" - "1"` $i)
	# output the command that's about to be executed
	# so you can see progress
	echo $mycmd
	#now execute it
	$mycmd
done
# after this execute this:
# montage *.jpg -tile 1x -mode concatenate slitscan.jpg