code: def open_video(specifier):
      
      if specifier.startswith('device:'):
          specifier_dev = int(specifier[7:])
          log.debug('Opening video device {0}...'.format(specifier_dev))
          vc = cv2.VideoCapture(specifier_dev)
      elif specifier.startswith('raw:'):
          try:
              w, h = tuple(int(x) for x in specifier[4:].split('x'))
          except ValueError:
              log.error('Could not parse raw specifier size from "{0}"'.format(specifier))
              return 1
          log.debug('Using raw video with shape {0}x{1}'.format(w,h))
          vc = _RawVideoCapture(w, h)
      else:
          log.debug('Using OpenCV video capture on {0}'.format(specifier))
          vc = cv2.VideoCapture(specifier)
  
      return vc
docs: Return an OpenCV VideoCapture-like object which can be used to read
      frames from *specifier*. Note that only the read() method is guaranteed to
      be defined.