cv2读取视频帧会导致python生成器将输出延迟到最后

import cv2
import threading

class VideoReader:
    def __init__(self, video_path):
        self.video_path = video_path
        self.frame_generator = self.read_frames()

    def read_frames(self):
        video = cv2.VideoCapture(self.video_path)
        while True:
            ret, frame = video.read()
            if not ret:
                break
            yield frame

    def get_frame(self):
        return next(self.frame_generator)

def process_frames(video_path):
    reader = VideoReader(video_path)
    while True:
        frame = reader.get_frame()
        # 进行帧处理的操作
        # ...

# 在主线程中调用process_frames函数
if __name__ == '__main__':
    video_path = 'path/to/video.mp4'
    process_frames(video_path)