updates from the article

merge.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Split the frames out
+mkdir frames
+ffmpeg -i $1 frames/frame%04d.png
+
+# Change the white -> transparent
+mkdir chromakeyed
+for f in frames/*
+do
+    convert $f -fuzz 50% -transparent white chromakeyed/$(basename $f)
+done
+
+# Merge all the frames into one image
+convert chromakeyed/* -background red -flatten flat.png
+
+rm -r frames chromakeyed

run.sh

@@ -1,7 +1,11 @@
 #!/bin/bash
 
+FPS=30
+DURATION=5
+COMPRESSION=40
+
 X=400
-Y=100
+Y=150
 
 # Create the mask
 convert \
@@ -13,13 +17,13 @@ convert \
 convert -size 2000x${Y} canvas: +noise Random -monochrome -alpha off background.png
 
 # Create video
-ffmpeg -loglevel error -hide_banner -y -framerate 60 -loop true -t 10 -i background.png -i mask.png \
+ffmpeg -loglevel error -hide_banner -y -framerate $FPS -loop true -t $DURATION -i background.png -i mask.png \
 	-filter_complex "
 		[0] crop=x=n:w=${X}:h=${Y},split[bg][a];
 		[a] hflip,vflip [flip];
 		[1] alphaextract [mask];
 		[flip][mask] alphamerge [text];
 		[bg][text] overlay"\
-	-c:v libx264 -crf 10 -an out.mp4
+	-c:v libx264 -crf $COMPRESSION -an out.mp4
 
-# rm mask.png
+rm mask.png background.png