使用 opencv、pyautogui 和 numpy 从屏幕上录制的视频比原始视频更快或更慢

问：

我试图在python上编写一个程序来记录屏幕。但是我遇到了一个问题，即输出比原始速度快。我试图更改 fps 值或延迟帧录制，但没有帮助。请帮帮我。下面是我的代码

import pyautogui
import cv2
import numpy as np

resolution = (1920, 1080)

codec = cv2.VideoWriter_fourcc(*"XVID")
filename = "Recording.avi"

fps = 20.0
out = cv2.VideoWriter(filename, codec, fps, resolution)
cv2.namedWindow("Live", cv2.WINDOW_NORMAL)
cv2.resizeWindow("Live", 480, 270)

while True:
    img = pyautogui.screenshot()
    frame = np.array(img)
    frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    out.write(frame)
    cv2.imshow('Live', frame)

    if cv2.waitKey(1) == ord('q'):
        break

out.release()
cv2.destroyAllWindows()