OpenCV常用操作之模拟行车记录仪

朋远方 • 2022年9月8日下午6:37 • 学习笔记 • 368 views

在本文中，Python通过调用OpenCV模块模拟了行车记录仪的工作全流程，包括如下功能：

Python调用摄像头
根据使用者输入的时间长度进行录像并保存到本地
自动删除超过一定时间的视频文件

案例代码：

import time
import cv2

video_time = int(input('请输入每个视频的长度（单位为秒）：'))
cap = cv2.VideoCapture(0)

width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

fourcc = cv2.VideoWriter.fourcc(*'mp4v')

last_start_time = time.time()

out = cv2.VideoWriter('./video/' + 'output-' + str(int(time.time())) + '.mp4', fourcc, 20.0, (width, height))

while cap.isOpened() and ((cv2.waitKey(1) & 0xFF) != ord('q')):
    if time.time() - last_start_time >= video_time:
        out.release()
        out = cv2.VideoWriter('./video/' + 'output-' + str(int(time.time())) + '.mp4', fourcc, 20.0, (width, height))
        last_start_time = time.time()

    ret, frame = cap.read()
    if ret:
        out.write(frame)
        cv2.imshow('My Camera', frame)
    else:
        break

out.release()
cap.release()
cv2.destroyWindow()

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