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vs2019+opencv4.1.0+python3.7简单例程(捕获显示摄像头图像)出现如下错误：

使用例程：

import cv2cap = cv2.VideoCapture(1)while(1):    # get a frame    ret, frame = cap.read()    # show a frame    cv2.imshow("capture", frame)    if cv2.waitKey(1) & 0xFF == ord('q'):        breakcap.release()cv2.destroyAllWindows()

出现错误：

WARN: 1」global C: pro jects \opencv- py thon \opencv modules videoio\src cap msmf. cpp (1113) SourceReaderCB: :OnReadSample i deoio (MSMF) : OnReadSample() is called with error status: 一1072861855 WARN:1] global C: \projects \opencv py thon \opencv \modules \videoio\src cap_ msmf. cpp (1125) SourceReaderCB: :OnReadSample Vi deoio (MSMF) : async ReadSample() call is failed with error status: 一1072861855[ WARN:O] global C: \pro jects \opencv-py thon \opencv \modules \videoio src\cap_ msmf. cpp (1159) CvCapture_ MSME: : grabFrame videoio (MSMF): can t grab frame.Error: -1072861855Traceback (most recent call last) :File" C: Users DELL Desktop \Py thonApplicat ion1 \Py thonApplicationl \PythonApplicationl.py"，line 8，in 
   
    cv2. imshow(" capture ，frame )v2. error: OpenCV(4.2.0) C: \pro jects opencv py thon opencv \modules \hi ghgui \src window. cpp:376: error: ( 215:Assertion failed) size. width>0 & size. height>0 in function cV: : imshowWARN:O] global C: \pro jects opencv- py thon opencv \modules \vi deoio\src\cap msmf. cpp (674) SourceReaderCB: : SourceReaderCBterminating async callback 请按任意键继续.
   

更改例程：

import cv2cap = cv2.VideoCapture(1,cv2.CAP_DSHOW)while(1):    # get a frame    ret, frame = cap.read()    # show a frame    cv2.imshow("capture", frame)    if cv2.waitKey(1) & 0xFF == ord('q'):        breakcap.release()cv2.destroyAllWindows()

即将cap = cv2.VideoCapture(1)改为了cap = cv2.VideoCapture(1,cv2.CAP_DSHOW)

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