  
          self.export_face = True
  
      def process(self):
          """ Perform the extraction process """
          print('Starting, this may take a while...')
          Utils.set_verbosity(self.args.verbose)
  
 
</s>
        self.save_interval = self.args.save_interval if hasattr(self.args, "save_interval") else None
  
          self.export_face = True
        self.save_interval = self.args.save_interval if hasattr(self.args, "save_interval") else None
  
      def process(self):
          """ Perform the extraction process """
          print('Starting, this may take a while...')
          Utils.set_verbosity(self.args.verbose)
  
keep add keep keep keep keep keep keep
 alignments.json save interval for extracting (#477)

* implement save interval
scripts/extract.py