我的 python 代码 fr_height, fr_width, _ = frame.shape AttributeError: 'NoneType' object has no attribute 'shape' 出现此错误

Question

我得到的错误：

C:\Users\KGB\PycharmProjects\Screen_rec\venv\Scripts\python.exe C:/Users/KGB/PycharmProjects/Screen_rec/main.py
[ WARN:0] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (438) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
Traceback (most recent call last):
  File "C:\Users\KGB\PycharmProjects\Screen_rec\main.py", line 24, in <module>
    fr_height, fr_width, _ = frame.shape
AttributeError: 'NoneType' object has no attribute 'shape'

Process finished with exit code 1

我的代码在这里给出：

import datetime

from PIL import ImageGrab
import numpy as np
import cv2
from win32api import GetSystemMetrics

import sys

width = GetSystemMetrics(0)
height = GetSystemMetrics(1)
time_stamp = datetime.datetime.now().strftime('%Y-%m-%d %H-%M-%S')
file_name = f'{time_stamp}.mp4'
fourcc = cv2.VideoWriter_fourcc('m', 'p', '4', 'v')
captured_video = cv2.VideoWriter(file_name, fourcc, 20.0, (width, height))

webcam = cv2.VideoCapture(1)

while True:
    img = ImageGrab.grab(bbox=(0, 0, width, height))
    img_np = np.array(img)
    img_final = cv2.cvtColor(img_np, cv2.COLOR_BGR2RGB)
    _, frame = webcam.read()
    fr_height, fr_width, _ = frame.shape
    img_final[0:fr_height, 0: fr_width, :] = frame[0: fr_height, 0: fr_width, :]
    cv2.imshow('Secret Capture', img_final)

    # cv2.imshow('webcam', frame)

    captured_video.write(img_final)
    if cv2.waitKey(10) == ord('q'):
        break

我正在尝试构建一个屏幕记录的 python 程序。 我一直在网上寻找很多解决方案，但我发现没有一个可行，这个程序是我作为学生的第一个高级项目

Answer 1

我找到了答案，我只需将webcam = cv2.VideoCapture(1) 更改为webcam = cv2.VideoCapture(0) 希望这可以帮助遇到相同和/或“相似”问题的每个人