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@cwoodall cwoodall/make_gif.sh
Created Dec 24, 2016

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A little script for generating compressed gifs using ffmpeg from a video file (webm, or mp4)
#!/bin/bash
ORIG_DIR=`pwd`
FRAME_DIR="/tmp/gif-frames"
LOSSY=80
FPS=5
LOOP=0
SCALE=.5
COLORS=128
# A POSIX variable
OPTIND=1 # Reset in case getopts has been used previously in the shell.
# Initialize our own variables:
output_file="out.gif"
usage="$(basename "$0") [-h] [-o out.gif] [-c C] [-s S] [-l L] [-d D] [-f F] input_file.gif
A little script for generating compressed gifs using ffmpeg, imagemagick and
gisicle (with giflossy).
where:
-h show this help text
-s Scale the image by this percentage (default: $SCALE)
-o Output filename (default: $output_file)
-c Colors (default: $COLORS)
-l Loop (default: $LOOP)
-d Temporary output directory (default: $FRAME_DIR)
-f Frame rate in FPS (default: $FPS)"
while getopts h\?o:s:c:l:d:f: opt; do
case "$opt" in
h|\?)
printf "$usage"
exit 0
;;
o) output_file=$OPTARG
;;
s) SCALE=$OPTARG
;;
l) LOOP=$OPTARG
;;
d) FRAME_DIR=$OPTARG
;;
c) COLORS=$OPTARG
;;
f) FPS=$OPTARG
;;
esac
done
shift $((OPTIND-1))
[ "$1" = "--" ] && shift
echo $@
mkdir $FRAME_DIR
ffmpeg -i "$@" -r $FPS "$FRAME_DIR/frame-%03d.jpg"
cd $FRAME_DIR
convert -delay $(( 100 / FPS )) -loop $LOOP *.jpg tmp.gif
gifsicle -O3 --lossy=$LOSSY --colors=$COLORS --scale=$SCALE -o $ORIG_DIR/$output_file tmp.gif
rm -r $FRAME_DIR
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