opencv rtsp 延迟高

Opencv读取rtsp流后进行图像处理会有非常大的延时，解决方法是创建一个线程专门用于抓取帧。下面是一个示例代码，可以帮助你更好地理解如何使用线程来解决Opencv读取rtsp流的延迟问题。

import cv2
import threading

class VideoCaptureThreading:
    def __init__(self, src=0):
        self.capture = cv2.VideoCapture(src)
        self.frame = None
        self.stopped = False

    def start(self):
        threading.Thread(target=self.update, args=()).start()
        return self

    def update(self):
        while not self.stopped:
            if not self.capture.isOpened():
                print('Unable to load camera.')
                break
            ret, frame = self.capture.read()
            if ret:
                self.frame = frame
        self.capture.release()

    def read(self):
        return self.frame

    def stop(self):
        self.stopped = True

if __name__ == '__main__':
    video_capture = VideoCaptureThreading('rtsp://admin:abc123456@192.168.1.64/h264/ch1/main/av_stream').start()
    while True:
        frame = video_capture.read()
        if frame is not None:
            cv2.imshow('Video', frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    video_capture.stop()
    cv2.destroyAllWindows()