python通过迭代器读取视频帧_self.cap.read()

代码：

class VideoIter(object):
    def __init__(self, video_name):
        self.cap = cv2.VideoCapture(video_name)
        self.size = [int(self.cap.get(cv2.CAP_PROP_FRAME_HEIGHT)),
                     int(self.cap.get(cv2.CAP_PROP_FRAME_WIDTH))]
        self.fps = self.cap.get(cv2.CAP_PROP_FPS)
        assert self.cap.isOpened(), FileNotFoundError
        self.num_frame = self.cap.get(cv2.CAP_PROP_FRAME_COUNT)
        self.index = -1
 
    def __iter__(self):
        return self
 
    def __next__(self):
        # while True:
        if self.index < self.num_frame:
            ret, frame = self.cap.read()
            if ret:
                self.index += 1
                return frame
            else:
                raise ValueError
        else:
            raise StopIteration
 
video_iter = VideoIter(os.path.join(video_path))
 
size = video_i.size
num_frame = video_iter.num_frame
fps = video_iter.fps
 
start_frame, end_frame = scene[0], scene[1]
 frame_data = []
 
while video_iter.index < end_frame and video_iter.index < num_frame:
    frame = next(video_iter)
    frame_data.append(frame)