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#!/bin/sh
# source: https://github.com/Drakirus/dotfiles/blob/master/bin/2gif
$(ffmpeg --help 2> /dev/null > /dev/null)
if [[ $? -ne 0 ]]; then
echo "ffmpeg is required!"
exit 1
fi
# default values
FPS=12
# read the options
TEMP=`getopt -o c:r:f:t:s:d:hl:: --long resolution:,fps:,start:,to:,duration:,help,loop:: -n $0 -- "$@"`
eval set -- "$TEMP"
# extract options and their arguments into variables.
while true ; do
case "$1" in
-h|--help)
echo -e "Usage: $0 [options] <input video file> <output gif name>\n"
echo "Options:"
echo " -h, --help Show this help"
echo " -r, --resolution Set the pixels wide (preserving the aspect ratio)"
echo " -f, --fps Set the gif frame rate"
echo " default 12"
echo " -s, --start Skip the first x seconds"
echo " -t, --to Capture to x seconds"
echo " -d, --duration Set the duration"
echo " -l, --loop Number of times to loop the output"
echo " default: no loop"
echo " -l output loop infinitely"
echo " -l10 output loop 10 times"
echo "Examples:"
echo " $0 input.mp4 out.gif"
echo " $0 input.mp4 out.gif -s"00:01" -d5 -r450"
echo " $0 input.mp4 out.gif -s"20:00" -d5 -l --fps30"
exit;;
-r|--resolution)
case "$2" in
"") shift 2 ;;
*) RESOLUTION="$2"; shift 2 ;;
esac ;;
-t|--to)
case "$2" in
"") shift 2 ;;
*) TO="-t $2"; shift 2 ;;
esac ;;
-l|--loop)
case "$2" in
"") LOOP="-loop=0" ; shift 2 ;;
*) LOOP="-loop=$2" ; shift 2 ;;
esac ;;
-f|--fps)
case "$2" in
"") shift 2 ;;
*) FPS="$2"; shift 2 ;;
esac ;;
-s|--start)
case "$2" in
"") shift 2 ;;
*) START="-ss $2"; shift 2 ;;
esac ;;
-d|--duration)
case "$2" in
"") shift 2 ;;
*) DURATION="-t $2"; shift 2 ;;
esac ;;
--) shift ; break ;;
*) echo "Internal error!" ; exit 1 ;;
esac
done
if [[ "$#" -ne 2 && "$#" -ne 1 ]]; then
echo -e "Usage: $0 [options] <input video file> <output gif name>\n"
echo -e "Illegal number of parameters or parameters.\nFor more informations:\n $0 --help "
exit 1
fi
OUTPUT="$2"
if [[ "$#" -eq 1 ]]; then
filename=$(basename "$1")
filename="${filename%.*}.gif"
OUTPUT=$filename
fi
if [[ "$RESOLUTION" -eq "" ]]; then
eval $(ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=width "$1")
RESOLUTION=${streams_stream_0_width}
fi
palette=$(mktemp /tmp/palette_XXXX.png)
filters="fps=$FPS,scale=$RESOLUTION:-1:flags=lanczos"
# echo $filters
# http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html#usage
# create global color palette
ffmpeg -v warning $START $TO $DURATION -i "$1" -vf "$filters,palettegen" -y "$palette"
# create GIF
ffmpeg -v warning $START $TO $DURATION -i "$1" -i "$palette" -lavfi "$filters [x]; [x][1:v] paletteuse" -y "$OUTPUT"
rm $palette
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