High quality gif

gif-create.sh

#!/bin/bash

# http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

# gif-create.sh video.mp4 output.gif start_time duration <fps> <width>
# default is 30 FPS, width 340

# Twitter limits: max 40 FPS and max 15 MB

start_time=$3
duration=$4
fps=${5:-30}
width=${6:-340}

palette="/tmp/palette.png"

filters="fps=$fps,scale=$width:-1:flags=lanczos"
palettegenfilters="=stats_mode=diff"
palettefilters="=dither=bayer:bayer_scale=3" # try sierra2

ffmpeg -v warning -ss $start_time -t $duration -i $1 -vf "$filters,palettegen" -y $palette
ffmpeg -v warning -ss $start_time -t $duration -i $1 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse$palettefilters" -y $2