How to use the scenedetect.detect_scenes_file function in scenedetect

def crap_detect(video_dir):
  detector_list = [
    scenedetect.detectors.ThresholdDetector(threshold=16, min_percent=0.6)
  ]

  file_paths = gfile.Glob(os.path.join(video_dir, '*.avi'))
  l = []
  for file_path in file_paths:
    try:
      print(file_path)
      scene_list = []
      video_framerate, frames_read = scenedetect.detect_scenes_file(
        file_path, scene_list, detector_list)

      # scene_list now contains the frame numbers of scene boundaries.
      print(l)
      if len(scene_list) >= 1:
        l.append(file_path)
    except:
      pass

def scene_detect(videoPath):
    sceneDetect = []
    detector_list = [scenedetect.detectors.ThresholdDetector(threshold = 30, min_percent = 0.9)]
    print videoPath
    video_framerate, frames_read = scenedetect.detect_scenes_file(videoPath, sceneDetect, detector_list)
    return sceneDetect

# it's tightly coupled to the command line arguments passed by scenedetect.cli
    # TODO: Rewrite the necessary PySceneDetect functions so they aren't retarded.
    # or write my own detector that stops after finding a match, see detect_threshold
    scene_detectors = scenedetect.detectors.get_available()
    args = DumbNamespace(threshold=threshold,
                         detection_method='content',
                         downscale_factor=2,
                         start_time=[0, start_minutes, 0],
                         duration=[0, end_minutes, 0],
                         quiet_mode=True,
                         # end custom arguments, begin defaults
                         min_scene_len=15,
                         frame_skip=0)
    scene_manager = scenedetect.manager.SceneManager(args=args, scene_detectors=scene_detectors)

    video_fps, frames_read, frames_processed = scenedetect.detect_scenes_file(path, scene_manager)

    scene_list_sec = [x / float(video_fps) for x in scene_manager.scene_list]

    return scene_list_sec[0]