How to use the scenedetect.detectors.ContentDetector function in scenedetect

def test_save_load_from_video(test_video_file):
    """ Test generating and saving some frame metrics from TEST_VIDEO_FILE to a file on disk, and
    loading the file back to ensure the loaded frame metrics agree with those that were saved.
    """
    video_manager = VideoManager([test_video_file])
    stats_manager = StatsManager()
    scene_manager = SceneManager(stats_manager)

    base_timecode = video_manager.get_base_timecode()

    scene_manager.add_detector(ContentDetector())

    try:
        video_fps = video_manager.get_framerate()
        start_time = FrameTimecode('00:00:00', video_fps)
        duration = FrameTimecode('00:00:20', video_fps)

        video_manager.set_duration(start_time=start_time, end_time=duration)
        video_manager.set_downscale_factor()
        video_manager.start()
        scene_manager.detect_scenes(frame_source=video_manager)

        with open(TEST_STATS_FILES[0], 'w') as stats_file:
            stats_manager.save_to_csv(stats_file, base_timecode)

        stats_manager_new = StatsManager()

def test_content_detect(test_video_file):
    """ Test SceneManager with VideoManager and ContentDetector. """
    vm = VideoManager([test_video_file])
    sm = SceneManager()
    sm.add_detector(ContentDetector())

    try:
        video_fps = vm.get_framerate()
        start_time = FrameTimecode('00:00:00', video_fps)
        end_time = FrameTimecode('00:00:05', video_fps)

        vm.set_duration(start_time=start_time, end_time=end_time)
        vm.set_downscale_factor()

        vm.start()
        num_frames = sm.detect_scenes(frame_source=vm)
        assert num_frames == end_time.get_frames() + 1

    finally:
        vm.release()

def test_scene_list(test_video_file):
    """ Test SceneManager get_scene_list method with VideoManager/ContentDetector. """
    vm = VideoManager([test_video_file])
    sm = SceneManager()
    sm.add_detector(ContentDetector())

    try:
        base_timecode = vm.get_base_timecode()
        video_fps = vm.get_framerate()
        start_time = FrameTimecode('00:00:05', video_fps)
        end_time = FrameTimecode('00:00:15', video_fps)

        assert end_time.get_frames() > start_time.get_frames()

        vm.set_duration(start_time=start_time, end_time=end_time)
        vm.set_downscale_factor()

        vm.start()
        num_frames = sm.detect_scenes(frame_source=vm)

        assert num_frames == (1 + end_time.get_frames() - start_time.get_frames())

def test_content_detect_opencv_videocap(test_video_file):
    """ Test SceneManager with cv2.VideoCapture and ContentDetector. """
    cap = cv2.VideoCapture(test_video_file)
    sm = SceneManager()
    sm.add_detector(ContentDetector())

    try:
        video_fps = cap.get(cv2.CAP_PROP_FPS)
        duration = FrameTimecode('00:00:05', video_fps)

        num_frames = sm.detect_scenes(frame_source=cap, end_time=duration)

        assert num_frames == duration.get_frames()

    finally:
        cap.release()

def scene_detect(opt):

  video_manager = VideoManager([os.path.join(opt.avi_dir,opt.reference,'video.avi')])
  stats_manager = StatsManager()
  scene_manager = SceneManager(stats_manager)
  # Add ContentDetector algorithm (constructor takes detector options like threshold).
  scene_manager.add_detector(ContentDetector())
  base_timecode = video_manager.get_base_timecode()

  video_manager.set_downscale_factor()

  video_manager.start()

  scene_manager.detect_scenes(frame_source=video_manager)

  scene_list = scene_manager.get_scene_list(base_timecode)

  savepath = os.path.join(opt.work_dir,opt.reference,'scene.pckl')

  if scene_list == []:
    scene_list = [(video_manager.get_base_timecode(),video_manager.get_current_timecode())]

  with open(savepath, 'wb') as fil:

def scene_detect(opt):

  video_manager = VideoManager([os.path.join(opt.avi_dir,opt.reference,'video.avi')])
  stats_manager = StatsManager()
  scene_manager = SceneManager(stats_manager)
  # Add ContentDetector algorithm (constructor takes detector options like threshold).
  scene_manager.add_detector(ContentDetector())
  base_timecode = video_manager.get_base_timecode()

  video_manager.set_downscale_factor()

  video_manager.start()

  scene_manager.detect_scenes(frame_source=video_manager)

  scene_list = scene_manager.get_scene_list(base_timecode)

  savepath = os.path.join(opt.work_dir,'scene.pckl')

  if scene_list == []:
    scene_list = [(video_manager.get_base_timecode(),video_manager.get_current_timecode())]

  with open(savepath, 'wb') as fil: