Color-optimized Video to GIF with ffmpeg

encodegif.sh

#!/bin/sh

# Generates an infinitely looping GIF (-loop 0) from an input video with ffmpeg.
# Arguments, in order: input video file, output gif file, end time (seconds)
# Modify args in `filters` to change fps or size (height) in pixels.
# Credit for optimizing color palette quality goes to:
# http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

palette="/tmp/palette.png"

filters="fps=20,scale=199:-1:flags=lanczos"

ffmpeg -v warning -i $1 -loop 0 -vf "$filters,palettegen" -to $3 -y $palette
ffmpeg -v warning -i $1 -loop 0 -i $palette -lavfi "$filters [x]; [x][1:v] paletteuse" -to $3 -y $2