Convert you QuickTime recorded screencast in the MOV and turn it into an animated GIF

mov2gif.rb

#!/usr/bin/env ruby

=begin
DEPENDENCIES:
$ brew install ffmpeg
$ brew install imagemagick
=end

require 'optparse'
require 'fileutils'
require 'tmpdir'

VERSION = "0.1"

options = {
  fps: 15,
  loop: true
}

OptionParser.new do |opts|
  opts.banner = "Usage: #{opts.program_name} file.mov file.gif [options]"
  opts.on('-v', '--version') do
    puts "#{opts.program_name} v#{VERSION}"
    exit
  end

  opts.on('--fps N', Integer, "Set N frames per second (default: #{options[:fps]})") do |fps|
    options[:fps] = fps
  end

  opts.on('-l', '--[no-]loop', "Turn looping on or off (default: #{options[:loop]})") do |lp|
    options[:loop] = lp
  end
end.parse!

mov_file = File.expand_path(ARGV[0])
gif_file = File.expand_path(ARGV[1])

abort "Please specify both mov and gif file" unless File.exist?(mov_file) && gif_file

puts "Processing: #{mov_file} -> #{gif_file}, #{options.inspect}"

temp_dir = Dir.mktmpdir(File.basename($0))
temp_template = File.join(temp_dir, '%5d.png')

convert_to_png = [
  'ffmpeg',
  '-loglevel',
  'quiet',
  '-i',
  mov_file,
  '-r',
  options[:fps].to_s,
  temp_template
]

puts "Executing #{convert_to_png.join(' ')}"
Process.waitpid spawn(*convert_to_png)

convert_to_gif = [
  'convert',
  '-loop',
  options[:loop] ? '0' : '1',
  '-delay',
  "1x#{options[:fps]}",
  File.join(temp_dir, '*.png'),
  gif_file
]

puts "Executing #{convert_to_gif.join(' ')}"
Process.waitpid spawn(*convert_to_gif)

FileUtils.rm_rf(temp_dir)