                                "default": False,
                                "help": "Perform extra alignment to ensure "
                                        "left/right eyes are  at the same "
                                        "height"})
          return argument_list
  
  
  class ConvertArgs(ExtractConvertArgs):
      """ Class to parse the command line arguments for conversion.
 
</s>
        argument_list.append({"opts": ("-si", "--save-interval"),
                              "dest": "save_interval",
                              "type": int,
                              "default": None,
                              "help": "Automatically save the alignments file "
                                      "after a set amount of frames. Will only "
                                      "save at the end of extracting by "
                                      "default. WARNING: Don't interrupt the "
                                      "script when writing the file because "
                                      "it might get corrupted."})
                                "default": False,
                                "help": "Perform extra alignment to ensure "
                                        "left/right eyes are  at the same "
                                        "height"})
        argument_list.append({"opts": ("-si", "--save-interval"),
                              "dest": "save_interval",
                              "type": int,
                              "default": None,
                              "help": "Automatically save the alignments file "
                                      "after a set amount of frames. Will only "
                                      "save at the end of extracting by "
                                      "default. WARNING: Don't interrupt the "
                                      "script when writing the file because "
                                      "it might get corrupted."})
          return argument_list
  
  
  class ConvertArgs(ExtractConvertArgs):
      """ Class to parse the command line arguments for conversion.
keep keep keep add keep keep keep keep keep
 alignments.json save interval for extracting (#477)

* implement save interval
lib/cli.py