如何在20秒后从python中的网络摄像头视频开始捕获视频帧

Question

Somebody do help me to solve this problem. When the program starts execute, the webcam get starts to capture the video as an input. After 20 sec, want to start capturing the frame and produce it as an output.

Answer 1

Here you go:

import cv2
import time

cam = cv2.VideoCapture(0)
cam.set(cv2.CAP_PROP_FRAME_WIDTH, 1280)
cam.set(cv2.CAP_PROP_FRAME_HEIGHT, 720)

fourcc = cv2.VideoWriter_fourcc(*'XVID')

videoout = cv2.VideoWriter("output.mkv", fourcc, cam.get(cv2.CAP_PROP_FPS), (1280, 720))

start = time.time()

while True:
    ret, frame = cam.read()
    if time.time() - start > 20:
        videoout.write(frame)

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