Get duration of all MP3s in a directory (recursively)

mp3_duration.rb

#   INSTRUCTIONS

#   - Puth this file into a directory containing mp3s
#   - Open in TextMate + run it (cmd+r)
#   - get_audio_length method via: http://bit.ly/sIKObq

dir = File.dirname(__FILE__)

mp3s = File.join(dir, "**", "*.mp3")

def get_audio_length(filepath)
  pipe = "ffmpeg -i "+ filepath.to_s+" 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//"
  command = `#{pipe}`
  if command =~ /([\d][\d]):([\d][\d]):([\d][\d]).([\d]+)/
    #convert the result to only secs
    duration = ($2.to_i * 60) + $3.to_i
  end
  #return and array containing the seconds and the human readable time length, ["6453","03:54"]
  return "#{duration.to_s},#{$2}:#{$3}".split(",")
end

Dir.glob(mp3s) do |f|
  p f
  p get_audio_length(f)
end