text: from mp4box.box import TrackFragmentDecodingTime
  
  
  def parse_tfdt(reader, my_size):
      version = reader.read32()
      box = TrackFragmentDecodingTime(my_size, version, 0)
      if version == 1:
          box.base_media_decode_time = reader.read64()
      else:
          box.base_media_decode_time = reader.read32()
  