def total_time
      totalTime = 0
      begin
        f = File.open(@fileName, "r")
      rescue
        return sec2seq(totalTime)
      end
      f.each_line do |line|
        next if line =~ /^\d{4}-\d{2}-\d{2}/
        # **:**:**表示を秒に変換
        line.chomp.split(":").each_with_index do |time, i|
          totalTime += time.to_i*60**(2-i)
        end
      end
      f.close
      sec2seq(totalTime)
    end
def total_time
      totalTime = 0
      begin
        f = File.open(@fileName, "r")
      rescue
        return sec2seq(totalTime)
      end
      f.each_line do |line|
        next if line =~ /^\d{4}-\d{2}-\d{2}/
        # **:**:**表示を秒に変換
        line.chomp.split(":").each_with_index do |time, i|
          totalTime += time.to_i*60**(2-i)
        end
      end
      f.close
      sec2seq(totalTime)
    end
戻り値はString