取得影音檔的時間長度

def get_video_file_duration(inputFilename)

  cmd = "ffmpeg -i " + inputFilename.to_s

  cmd += " 2>&1 | grep 'Duration' "

  cmd += " | cut -d ' ' -f 4 | sed s/,//"

  output = `#{cmd}`

  if output =~ /([\d][\d]):([\d][\d]):([\d][\d]).([\d]+)/

    duration = (($1.to_i * 60 + $2.to_i) * 60 + $3.to_i) * 10 + $4.to_i

  end

  return "#{$2}:#{$3}"

end

fname = "2004100321.wmv"

dur = get_video_file_duration(fname)

puts dur