              self._count = len(self.file_list_sorted)
          return self._count
  
      def check_input_folder(self) -> Optional[cv2.VideoCapture]:
          """ makes sure that the frames or faces folder exists
              If frames folder contains a video file return imageio reader object
  
          Returns
          -------
          :class:`cv2.VideoCapture`
 
</s> remove         """ Check the alignments file exists
 </s> add         """  Check if the alignments file exists, and returns a tuple of the folder and filename. </s> remove     def _get_writer(self) -> "GIFFormat.Writer":
 </s> add     def _get_writer(self) -> "im_format.Format.Writer": </s> remove         reader = imageio.get_reader(self._source_video, "ffmpeg")
 </s> add         reader = imageio.get_reader(self._source_video, "ffmpeg")  # type:ignore[arg-type]
        """ Ensure that the frames or faces folder exists and is valid.
              self._count = len(self.file_list_sorted)
          return self._count
  
      def check_input_folder(self) -> Optional[cv2.VideoCapture]:
        """ Ensure that the frames or faces folder exists and is valid.
              If frames folder contains a video file return imageio reader object
  
          Returns
          -------
          :class:`cv2.VideoCapture`
keep keep keep keep replace keep keep keep keep keep
 tests:
  - unit test: tools.alignments.media
  - Add mypy test
  - Typing fixes 
tools/alignments/media.py