  
      def extract_single_process(self):
          """ Run extraction in a single process """
          for filename in tqdm(self.images.input_images, file=sys.stdout):
              filename, faces = self.process_single_image(filename)
              self.faces.faces_detected[os.path.basename(filename)] = faces
              frame_no += 1
 
</s>
        frame_no = 0
  
      def extract_single_process(self):
          """ Run extraction in a single process """
        frame_no = 0
          for filename in tqdm(self.images.input_images, file=sys.stdout):
              filename, faces = self.process_single_image(filename)
              self.faces.faces_detected[os.path.basename(filename)] = faces
              frame_no += 1
keep keep add keep keep keep keep
 alignments.json save interval for extracting (#477)

* implement save interval
scripts/extract.py