opencv播放rtsp摄像头(或USB摄像头)并且保存为视频

环境: VS2015 + opencv3.4.2

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关于opencv保存为视频的资料找了很多,最终找到了解决办法.
直接上代码:

int main()
{
    //打开RTSP流摄像头
    //cv::VideoCapture vcap;
    //const std::string videoStreamAddress = "rtsp://admin:[email protected]:554/MPEG-4/ch1/main/av_stream";
    //if (!vcap.open(videoStreamAddress))
    //{
    //  std::cout << "Error opening video stream or file" << std::endl;
    //  return -1;
    //}

    //打开USB摄像头
    cv::VideoCapture vcap = cv::VideoCapture(0);
    if (!vcap.isOpened())
    {
        return 0;
    }

    // 设置摄像头分辨率和每秒帧数
    vcap.set(CV_CAP_PROP_FRAME_WIDTH, 320);
    vcap.set(CV_CAP_PROP_FRAME_HEIGHT, 240);
    vcap.set(CV_CAP_PROP_FPS, 25);

    // 创建显示窗口
    cv::namedWindow("Video");

    // 初始化写入文件
    cv::VideoWriter videoWriter;
    int w = static_cast<int>(vcap.get(CV_CAP_PROP_FRAME_WIDTH));
    int h = static_cast<int>(vcap.get(CV_CAP_PROP_FRAME_HEIGHT));
    cv::Size videoSize(w, h);
    //获得帧率  
    double dfs = vcap.get(CV_CAP_PROP_FPS);
    int delay = 1000.0 / dfs;
    videoWriter.open(".\\123.avi", CV_FOURCC('D', 'I', 'V', 'X'), dfs, videoSize);
    if (!videoWriter.isOpened())
    {
        return 0;
    }

    int count = 0;
    while (1)
    {
        count++;

        if (count>200)
        {
            break;
        }

        cv::Mat frame;
        vcap.read(frame);
        cv::imshow("Video", frame);
        cv::waitKey(30);
        videoWriter.write(frame);
        frame.release();
    }

    // 关闭摄像头，关闭保存文件以及销毁显示窗口
    vcap.release();
    videoWriter.release();
    cv::destroyWindow("Video");

    return 0;
}

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两种模式都经过了测试,都能够保存为视频.
如有问题,请尝试下载xvid编解码器

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参考资料:
https://blog.csdn.net/bloke_come/article/details/79455703