blog_dm_mp4.rb

require 'open-uri'
require 'rubygems'
require 'nokogiri'

doc = Nokogiri::HTML(URI(ARGV[0]).read)
id = doc.at('//embed[starts-with(@src, "http://www.dailymotion.com/swf/")]')['src'].sub(%r!^http://www.dailymotion.com/swf/!, '')
html = URI("http://www.dailymotion.com/video/#{ id }").read

if html =~ /\.addVariable\("video", "(.+?)"/
  if URI.decode($1) =~ %r!(/get/\d+?/\d+?x\d+?/h264/.+?\.h264\?key=.+?)@!
    puts URI.encode(%(javascript:document.write('<a href="http://www.dailymotion.com#{ $1 }">download</a>')))
  end
end