python - 如何设置使用python opencv捕获视频的时间？

Question

我有一个从github https://gist.github.com/keithweaver/4b16d3f05456171c1af1f1300ebd0f12#file-save-video-w-opencv-py的摄像头捕获视频的代码。

但是如何设置捕获时间的限制呢？我想连续捕获多个视频，持续时间为3分钟，而不会丢帧。

我是编程的新手，任何人都可以帮助编写代码。非常感谢

Answer 1

您可以这样做:

startTime = time.time()

秒timeElapsed = startTime - time.time()

secElapsed = int(timeElapsed)

当while(secElapsed < 100)

时停止程序

代码示例，应如下所示:

import numpy as np
import cv2
import time

# The duration in seconds of the video captured
capture_duration = 10

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))

start_time = time.time()
while( int(time.time() - start_time) < capture_duration ):
    ret, frame = cap.read()
    if ret==True:
        frame = cv2.flip(frame,0)
        out.write(frame)
         cv2.imshow('frame',frame)
    else:
        break

cap.release()
out.release()
cv2.destroyAllWindows()