togif.js

#!/usr/bin/env node

require('shelljs/global');

var filename = process.argv[2];

// mediainfo --Output="Video;%Width%x%Height%" multiple-gradient.mov
var output = exec('mediainfo --Output="Video;%Width%x%Height%" ' + filename, {silent: true}).output
var matched = /(\d+)x(\d+)/.exec(output);


exec('ffmpeg -i ' + filename + ' -s ' + parseInt(matched[1])/2 + 'x' + parseInt(matched[2])/2 + ' -pix_fmt rgb24 -r 18 -f gif - | gifsicle --optimize=3 --delay=3 > ' + filename.split('.')[0] + '.gif')