#!/bin/bash

# Tehcnically, this works. However, the static needs to scan from one side to the
# other so you can see the difference in the two

X=100
Y=50
FRAMES=10

# Create the mask
convert \
	-background none -fill black \
	-pointsize 24 -size ${X}x${Y} -gravity center \
	label:TEST1 mask.png

# create pictures of static
mkdir -p back fore out
for i in $(seq 1 $FRAMES); do
	convert -size ${X}x${Y} canvas: +noise Random -monochrome back/${i}.png
	# Generate image of static, then mask it out using the mask.png
	convert -size ${X}x${Y} canvas: +noise Random -monochrome mask.png -compose CopyOpacity -composite fore/${i}.png
done

for i in $(seq 1 $FRAMES); do
	# Layer the two images
	convert back/$i.png fore/1.png -gravity center -background None -layers Flatten out/$i.png
done


# create gif
# convert -delay 1 -loop 0 out/* out.gif

# try video
convert -size 1920x50 canvas: +noise Random -monochrome -alpha off background.png

ffmpeg -y -framerate 30 -loop true -t 10 -i background.png -i mask.png -i background.png \
	-filter_complex "
		[0]crop=x=n:w=${X}:h=${Y}[bg];
		[2]crop=x=iw-n:w=${X}:h=${Y}[fg];
		[1]alphaextract[mask];
		[fg][mask]alphamerge[top];
		[bg][top]overlay=x=0:y=0"\
	-c:v libx264 out.mp4