Unix for Artists: Fun with FFMPEG is a workshop hosted by the Echo Park Film Center.
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#!/bin/bash -e
#####################################################
#
# This script will create a 10 second title and
# overlay it on a video with a blend mode:
#
# addition
# grainmerge
# and
# average
# darken
# difference
# grainextract
# divide
# dodge
# freeze
# exlusion
# extremity
# glow
# hardlight
# hardmix
# heat
# lighten
# linearlight
# multiply
# multiply128
# negation
# normal
# or
# overlay
# pheonix
# pinlight
# reflect
# screen
# softlight
# subtract
# vividlight
# xor
#
# Usage: bash ffmpeg/filter/title.sh <title text> <input video> <output video> <blendmode> "invert" (optional)
#
#####################################################
W=720
H=480
TEXT="${1}"
INPUT="${2}"
OUTPUT="${3}"
BLENDMODE="${4}"
# Check if output file extension is .mov
if [[ "${OUTPUT}" != *".mov" ]]; then
echo "Please use an .mov extension on your output file argument"
exit 1
fi
if [ "${BLENDMODE}" == "" ]; then
BLENDMODE="multiply"
fi
if [ "${5}" == "invert" ]; then
convert -size ${W}x${H} \
-background white \
-fill black \
-gravity Center \
-weight 700 \
-pointsize 100 \
label:"${TEXT}" \
title.png
else
convert -size ${W}x${H} \
-background black \
-fill white \
-gravity Center \
-weight 700 \
-pointsize 100 \
label:"${TEXT}" \
title.png
fi
ffmpeg -y -loop 1 \
-framerate 24 \
-f image2 \
-i title.png \
-s ${W}x${H} \
-c:v prores_ks \
-profile:v 3 \
-t 10 \
"title.mov"
ffmpeg -i "${INPUT}" -i "title.mov" -filter_complex "[0][1]blend=${BLENDMODE}" "${OUTPUT}"
# Clean up by removing the image and title video
rm title.png
rm title.mov