Fix OS X DVD Playback

dvd_fix.rb

#!/usr/bin/env ruby
#
# Forked from http://pastebin.com/WpRpaLAn

require 'fileutils'

# Settings
dvdLibPath = "/System/Library/Frameworks/DVDPlayback.framework/Versions/A/DVDPlayback"
search = "Internal"
replace = "External"

# writable?
raise "Can't patch the dvd library, please run via sudo." unless File.writable? dvdLibPath

# Create backup
FileUtils.cp dvdLibPath, "#{dvdLibPath} - #{Time.new}.bak"

# Patch
offset = 0

dvdlib = File.open dvdLibPath, "rb+"
dvdlib.seek(0, IO::SEEK_END)
length = dvdlib.pos
dvdlib.rewind

while (dvdlib.pos < (length - search.length))
  dvdlib.pos = offset
  bytes = dvdlib.read(search.length)
  if bytes == search
    dvdlib.pos = offset
    dvdlib.write(replace)
    printf "patched at offset: %#010x\n", offset
  else
      offset = offset + 1
  end
end

dvdlib.close