what_glitch_rgb.sh

#!/bin/bash

file=$1

#make a directory to do the glitching
rand=$RANDOM
mkdir /tmp/temp_$rand
cd /tmp/temp_$rand

#convert the movie to frames
avconv -i $file -qscale 0 out_%d.bmp

#count the number files in the directory
fileno=$(ls out_*.bmp -1 | wc -l)

#begin the glitch loop
no=1
while [ $no -le $fileno ]
do

rand1=$(tr -dc A-Za-z0-9_ < /dev/urandom | head -c 1)
rand2=$(tr -dc A-Za-z0-9_ < /dev/urandom | head -c 1)
rand3=$(tr -dc A-Za-z0-9_ < /dev/urandom | head -c 1)

rand4=$(tr -dc A-Za-z0-9_ < /dev/urandom | head -c 1)
rand5=$(tr -dc A-Za-z0-9_ < /dev/urandom | head -c 2)
rand6=$(tr -dc A-Za-z0-9_ < /dev/urandom | head -c 2)

convert -separate out_$no.bmp in_%d.bmp

#glitch the red channel
sed -i s/$rand1/$rand4/g in_0.bmp

#glitch the green channel
sed -i s/$rand2/$rand5/g in_1.bmp

#glitch the blue channel
sed -i s/$rand3/$rand6/g in_2.bmp

#combine the channels into one image
convert in_0.bmp in_1.bmp in_2.bmp -combine out_$no.bmp

#clear the directory of files
rm in_*.bmp

echo -e "Glitched file $no of $fileno"

no=$(($no + 1))

done

#get path of file
path=$( readlink -f "$( dirname "$file" )" )

#get filename minus extension
file1=$(basename "$file")
filename="${file1%.*}"

#combine the images into a video
avconv -i out_%d.bmp -qscale 0 "$path"/"$filename"_bmprgb.mkv

#remove the temporary directory
cd ../
rm -rf temp_$rand/