Ruby script to load Gravatars for git repo and produce gource video

gravatar_gource.rb

#!/usr/bin/env ruby
# Run script from inside git repo
# Paths setup for OS X
# requires gource and ffmpeg
# On OS X:
#     brew install ffmpeg gource
# Written by: Joe Pintozzi
#
# Resources
#   gource: https://code.google.com/p/gource/
#   homebrew: http://mxcl.github.io/homebrew/
#   pearl gravatar script: https://code.google.com/p/gource/wiki/GravatarExample

require "open-uri"
require "digest/md5"
require "fileutils"

log = %x[git log].split("\n")

FileUtils.mkdir_p '.git/avatars'

emails = Array.new

log.each do |line|
  /Author:\s*(.*)\s*<([a-z\.]*@[a-z]*\.[a-z]{2,})>/.match(line) { |m| 
    newHash = {name: m[1], email: m[2]} 
    emails << newHash unless m[2].nil? or emails.include?(newHash)
  }
end

emails.each do |hash|
  puts hash[:name]

  File.open('.git/avatars/' + hash[:name].strip! + '.png', 'wb') do |fo|
    fo.write open("http://www.gravatar.com/avatar/" + Digest::MD5.hexdigest(hash[:email])  + "?d=404&s=90").read 
  end
end

# now gource it
%x[gource --hide filenames,dirnames,date --user-image-dir .git/avatars/ -1280x720 -s 1 -o - | ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i - -vcodec libx264 -preset ultrafast -pix_fmt yuv420p -crf 1 -threads 0 -bf 0 ~/Desktop/output.mp4]
# exported video is uncompressed and most likely huge
# shrink it down with
# ffmpeg -i ~/Desktop/output.mp4 -b 512k -acodec copy ~/Desktop/shrunk.mp4