无法在macOS上使用opencv进行视频捕获

Question

在python上，当我尝试使用打开的cv2进行视频捕获时，我得到的结果是：

2021-11-18 11:07:36.572 Python[5863:20765] =>> Checked Property: [cfen] 1667655022
2021-11-18 11:07:36.572 Python[5863:20765] =>> Checked Property: [cfen] 1667655022
2021-11-18 11:07:36.572 Python[5863:20765] =>> Checked Property: [cfen] 1667655022
2021-11-18 11:07:36.572 Python[5863:20765] =>> Checked Property: [cfac] 1667653987
2021-11-18 11:07:36.621 Python[5863:20765] =>> Checked Property: [cfen] 1667655022
2021-11-18 11:07:36.622 Python[5863:20765] =>> Checked Property: [cfen] 1667655022
2021-11-18 11:07:36.722 Python[5863:20765] =>> Checked Property: [cfen] 1667655022
2021-11-18 11:07:36.722 Python[5863:20765] =>> Checked Property: [cfen] 1667655022

我还打开了这个窗口：

window

这是我的代码：

    import cv2


    trained_face_data = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
 
  
    webcam = cv2.VideoCapture(0)
    
    
    ret, frame = webcam.read()
   
   
    grayscaled_img = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    
    cv2.imshow('image face detector', grayscaled_img)
    
    cv2.waitKey(1)

Answer 1

只需将参数cv2.VideoCapture(0)更改为cv2.VideoCapture(2)即可解决

希望能对其他Mac用户有所帮助