mp4 to gif using ffmpeg and gifsicle(brew)

gifit.sh

# Author: @vitovalov
# Description: pass it a mp4 and you will have a gif
# Dependencies: ffmpeg, gifsicle
if [ "$#" -le 1 ]; then
    echo "\nUsage: sh gifit.sh   <source path to original mp4> <delay between frames>"
    echo "Warning! filenames shouldn't contain the extension\n"
    exit 1
fi
ffmpeg -i $1.mp4 -pix_fmt rgb24 -r 10 -f gif - | gifsicle --optimize=3 --delay=$2 > $1.gif

Here is my version which I tried to optimise ~ hovever Gifsicle seems to not reduce the file size much when already using a palette.

for f in "$@"
do
	scale="fps=20,scale='min(480,iw)':'min(480,ih)':force_original_aspect_ratio=decrease"
	/usr/local/bin/ffmpeg -hwaccel videotoolbox -i "$f" -vf "$scale,palettegen" "$f.png"
	/usr/local/bin/ffmpeg -hwaccel videotoolbox -i "$f" -i "$f.png" -filter_complex "$scale,paletteuse" "$f.gif"
	rm "$f.png"
done

This script can be used as a service in Mac Automator for a quick right click action.

Outside of mac you'll have to either remove -hwaccel videotoolbox or replace it with the corresponding hwaccel implementation available on your platform.