video_shuffle.rb

config = Mash.new YAML.load(File.open('config.yaml'))
en = WebService::EchoNest.new config[:api_key]
response = en.get_beats :id => "music://id.echonest.com/~/TR/TRQTAUB1204D807B19"
p response
p "\n\n\n"
beat8s = []
prev = response[:beats][0]
p prev
response[:beats].each_with_index do |beat, i|
  if i % 8 == 0
    p beat
    beat8s.push({
                  :start => Float(prev[:value]),
                  :duration => Float(beat[:value]) - Float(prev[:value]),
    })
    prev = beat
  end
end
first_duration = beat8s[0][:start]
beat8s[0] = {
  :start => 0.0,
  :duration => first_duration,
}
beat8s.shuffle!
p beat8s

video = 'FredvomJupiter.avi'
videos = []
beat8s.each_with_index do |beat, i|
  v = "tmp/beat_#{i}.avi"
  cmd = "ffmpeg -i #{video} -ss #{beat[:start]} -t #{beat[:duration]} #{v}"
  p cmd
  system cmd
  videos.push v
end
cmd = "mencoder " + videos.join(' ') + " -o shuffled.avi -oac copy -ovc copy"
p cmd
system cmd