如何在python中与cv2.waitKey（）一起提供条件？

Question

I need to capture video and stop video after 10 seconds.But when i give condition along with cv2.waitKey() video stops instantly.When i separate the condition the second condition(elapsed==10) doesn't work.My sample code is

import cv2
import time
cap = cv2.VideoCapture(0)
start_time=time.time()
while(True):
  # Capture frame-by-frame
  ret, frame = cap.read()
  # Our operations on the frame come here
  gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  e_time = time.time()
  elapsed = e_time - start_time
  # Display the resulting frame
  cv2.imshow('frame',gray)
  if cv2.waitKey(1) or elapsed==10:
    break
cap.release()
cv2.destroyAllWindows()

How to stop video after 10 seconds?

Answer 1

Try using elapsed>=10 .
It's not sure your code will EXACTLY hit the 10 elapsed seconds.
If 10.1 or 10.000000000001 seconds are elapsed your program will miss the time and never stop, because the condition will never be met.