youtubeのflvのURLひっこぬくRubyスクリプト書いてみた

download.rb

#coding: utf-8
require 'uri'
require 'open-uri'
require 'json'
require 'pp'

#url = 'http://www.youtube.com/watch?v=PwluBRxGAeI&feature=g-vrec&context=G2ab931cRVAAAAAAAAAw'
#watch_url = 'http://www.youtube.com/watch_video?v=PwluBRxGAeI'

print 'video url: '
url = gets.chop

page_body = open(url)
json_string = ''
page_body.each do |line|
  if line =~ /yt.playerConfig\ =\ /
    #puts line
    json_string = line.gsub(/yt.playerConfig\ =\ /, '').gsub(/;$/, '')
  end
end

player_config = JSON.parse(json_string)
url_encoded_fmt_stream_map = player_config['args']['url_encoded_fmt_stream_map']
#URI.decode(url_encoded_fmt_stream_map).split('url=')
flv_url = URI.decode(url_encoded_fmt_stream_map).gsub(/^url=/, '').split(',url=')[3]
flv_uri = URI.parse(flv_url)
flv_uri.query = flv_uri.query.split('&')[0..-5].join('&')
puts flv_uri.to_s

2012/08/14時点でまだ使えるっぽい