Unix for Artists: Fun with FFMPEG is a workshop hosted by the Echo Park Film Center.
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#!/bin/bash -e
#####################################################
#
# Bipack.sh will simulate the optical printing effect
# of superimposing video A over video B with a third
# video (the matte) as the alpha layer.
#
# Usage: bash ffmpeg/filter/bipack.sh <input video A> <input video B> <input video matte> <output video>
#
#####################################################
A=${1}
B=${2}
MATTE=${3}
OUTPUT_FILE=${4}
CONTRAST=100
W=1280
H=720
RATE=24
echo "Running bipack on image sources ${A} and ${B} with ${MATTE} as the matte layer..."
time ffmpeg -y -i $A -i $B -i $MATTE \
-filter_complex "
color=0x000000:size=${W}x${H}, format=rgb24[bla];
[0] fps=${RATE},scale=${W}:${H}:force_original_aspect_ratio=decrease,format=rgb24 [a];
[1] fps=${RATE},scale=${W}:${H}:force_original_aspect_ratio=decrease,format=rgb24 [b];
[2] fps=${RATE},scale=${W}:${H}:force_original_aspect_ratio=decrease,format=gray,
smartblur=1, eq=contrast=$CONTRAST, format=rgb24 [maska];
[2] fps=${RATE},scale=${W}:${H}:force_original_aspect_ratio=decrease,format=gray,
smartblur=1, eq=contrast=$CONTRAST, negate, format=rgb24 [maskb];
[bla][a][maska] maskedmerge, format=rgb24 [pass1];
[pass1][b][maskb] maskedmerge, format=rgb24
" \
-r $RATE \
-c:v prores_ks \
-profile:v 3 \
-shortest \
$OUTPUT_FILE