              self.extract_multi_process()
          else:
              self.extract_single_process()
  
          self.alignments.write_alignments(self.faces.faces_detected)
  
          images, faces = Utils.finalize(self.images.images_found,
                                         self.faces.num_faces_detected,
                                         self.faces.verify_output)
          self.images.images_found = images
          self.faces.num_faces_detected = faces
 
</s>
        self.write_alignments()
              self.extract_multi_process()
          else:
              self.extract_single_process()
  
        self.write_alignments()
        self.write_alignments()
          images, faces = Utils.finalize(self.images.images_found,
                                         self.faces.num_faces_detected,
                                         self.faces.verify_output)
          self.images.images_found = images
          self.faces.num_faces_detected = faces
keep keep keep keep replace replace keep keep keep keep keep
 alignments.json save interval for extracting (#477)

* implement save interval
scripts/extract.py