video

video-rickroll/combine.sh

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+ffmpeg \
+    -r 60000/1001 \
+    -i 'frames/dither-%04d.png' \
+    -i 'rickroll-audio.wav' \
+    -ac 2 \
+    -ar 48000 \
+    -vf 'pad=w=534,setsar=9/10' \
+    -pix_fmt yuv420p \
+    -movflags +faststart \
+    -y rickroll-dither.mp4

video-rickroll/extract.sh

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+set -a
+
+mkdir -p frames
+
+ffmpeg \
+    -i rickclip.mp4 \
+    -vf 'scale=320:192,framerate=60000/1001' \
+    -an \
+    -y 'frames/rickroll-%04d.png'
+
+ffmpeg \
+    -i rickclip.mp4 \
+    -vn \
+    -ac 1 \
+    -ar 15734 \
+    -acodec pcm_u8 \
+    -y 'rickroll-audio.wav'

video-rickroll/video.sh

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+set -e
+
+for frame in frames/rickroll-[0-9][0-9][0-9][0-9].png
+do
+    n="${frame#frames/rickroll-}"
+    n="${n%.png}"
+    out="frames/dither-${n}"
+    last="${n:0-1}"
+    node ../dither-image.js "$frame" "$out" &
+    if (( last == 9 ))
+    then
+        wait
+    fi
+done
+wait