How to disable Buffer in OpenCV Camera?

Question

I have this situation where I use OpenCV to detect faces in front of the camera and do some ML on those faces. The issue that I have is that once I do all the processing, an

Answer 1

I set cap value after reading each frame to None and my problem solved in this way:

import cv2
from PyQt5.QtCore import QThread

if __name__ == '__main__':
while True:
    cap = cv2.VideoCapture(0)
    ret, frame = cap.read()
    cv2.imshow('A', frame)
    cv2.waitKey(0)

    print('sleep!')
    QThread.sleep(5)
    print('wake up!')
    cap = None