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I use the simplest code: and I have an error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' How can I fix that? Thanks

I use the simplest code: import cv2 import time import numpy as np

cv2.namedWindow("video")

cap = cv2.VideoCapture(1) time.sleep(3)

while cv2.waitKey(1)!= 30: flag, frame = cap.read() cv2.imshow("video", frame)

cap.release() cv2.destroyAllWindows() and I have an error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' How can I fix that? Thanks

I use the simplest code:

import cv2
import time
import numpy as np
np
 cv2.namedWindow("video")
 
cv2.namedWindow("video")
 
cap = cv2.VideoCapture(1)
time.sleep(3)time.sleep(3)
  
while cv2.waitKey(1)!= 30:
    flag, frame = cap.read()
    cv2.imshow("video", frame)frame)

cap.release()
cv2.destroyAllWindows()

cap.release() cv2.destroyAllWindows() and I have an error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow' 'cv::imshow'

How can I fix that? Thanks