python - 无法使用网络摄像头读取帧。错误-2147483638

Question

我想在 python 上使用 help opencv 从网络摄像头读取视频，但我有下一个错误:

'NoneType' object has no attribute 'shape'.

在控制台中我有:[WARN:0] videoio(MSMF):无法抓取帧。错误:-2147483638

print("starting video stream...")
vs = VideoStream(src=0).start()
time.sleep(2.0)

while True:
    frame = vs.read()
    frame = imutils.resize(frame, width=600)    #'NoneType' object has no attribute 'shape'

    if W is None or H is None:
        (H, W) = frame.shape[:2]

    cv2.imshow("Frame", frame)
    key = cv2.waitKey(1) & 0xFF

    if key == ord("q"):
        break

cv2.destroyAllWindows()
vs.stop()

我能解决这个问题吗？谢谢!

Answer 1

相机的默认 MSMF api 不适用于 opencv 4.2.0.34，但适用于 opencv 3。切换到 DSHOW api 有效

cap = cv2.VideoCapture(0, cv2.CAP_DSHOW)