Youtube-Scraping

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require 'ubygems'
require 'mechanize'
if ARGV.size < 1
  puts "Usage: #{$0} [ keywords ... ]"
  exit -1
end
agent = WWW::Mechanize.new
homepage = agent.get('http://www.youtube.com/')
searchform = homepage.forms.select { |f| f.action == '/results' }.first
searchform['search_query'] = ARGV.join(' ')
result = searchform.submit
result.root.traverse_element('td') do |td|
  if td.classes == ['vinfo']
    a = td.find_element('a') || raise
    puts a.children.to_s
    watch = agent.click(a)
    if watch.root.to_s =~ /\?video_id=(.+?)\&l=(.+?)\&t=(.+?)\&/
      video_id, l, t = $1, $2, $3
      p [video_id, l, t]
      video_id.gsub!(/[^a-zA-Z0-9_-]/, '')
      video_id = a.get_attribute('href').split('?v=').last
      system("wget -O #{video_id}.flv 'http://www.youtube.com/get_video?video_id=#{video_id}&t=#{t}'")
    else
      puts "Warning: cannot find video URL"
    end
  end
end


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