如何使用 EmguCV 同时查看和录制视频？答案

【问题标题】：How to view and record video simultaneously using EmguCV?如何使用 EmguCV 同时查看和录制视频？
【发布时间】：2019-02-04 22:20:48
【问题描述】：

我正在开发类似于监控系统的 Windows Form App，并尝试同时捕获和保存视频。我可以从相机查看视频，但尝试保存视频时。生成一个空的视频文件。

由于我是 emguCV 的新手，所以我被卡住了，无法解决。

这是我尝试过的

 VideoCapture videoCapture;
        double totalFrames;
        double fps;
        VideoWriter videoWriter;
        DateTime dateTime;
        int i;

        public Body()
        {
            InitializeComponent();
            i = 0;


                if (videoCapture == null)
                {
                    dateTime = new DateTime();
                    dateTime = DateTime.Now;
                    videoCapture = new Emgu.CV.VideoCapture(0);
                }
                videoCapture.ImageGrabbed += VideoCapture_ImageGrabbed;
                videoCapture.Start();



        }

        private void VideoCapture_ImageGrabbed(object sender, EventArgs e)
        {

            Mat m = new Mat();
            videoCapture.Retrieve(m);
            pictureBox1.Image = m.ToImage<Bgr, byte>().Bitmap;

            totalFrames = videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameCount);
            fps = videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.Fps);

            if (videoCapture == null)
            {
                return;
            }
            else
            {

                int fourcc = Convert.ToInt32(videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FourCC));
                int frameHeight = Convert.ToInt32(videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameHeight));
                int frameWidth = Convert.ToInt32(videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameWidth));
                string destination = "C:\\Users\\ITNOA\\Desktop\\savedVideoDHS\\" + i+".mp4";
                videoWriter = new VideoWriter(destination, fourcc, fps, new Size(frameWidth, frameHeight), true);
                videoWriter.Write(m);
            }


        }

private void videoSavingtimer_Tick(object sender, EventArgs e)
        {
            videoCapture = null;
            i++;
            if (videoWriter.IsOpened)
            {
                videoWriter.Dispose();

            }
        }

有什么帮助吗？

谢谢。

【问题讨论】：

标签： c# video save video-capture emgucv

【解决方案1】：

这是使用 emgu cv 同时查看和保存视频的方法。

public Body()
        {
            InitializeComponent();

                if (videoCapture == null)
                {

                    videoCapture = new Emgu.CV.VideoCapture(0);
                }
                videoCapture.ImageGrabbed += VideoCapture_ImageGrabbed;
                videoCapture.Start();



        }

        private void VideoCapture_ImageGrabbed(object sender, EventArgs e)
        {
            if (fileChanged)
            {
                totalFrames = videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameCount);
                fps = videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.Fps);
                int fourcc = Convert.ToInt32(videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FourCC));
                int frameHeight = Convert.ToInt32(videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameHeight));
                int frameWidth = Convert.ToInt32(videoCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameWidth));
                string destination = "C:\\Users\\ITNOA\\Desktop\\savedVideoDHS\\" + i + ".avi";
                videoWriter = new VideoWriter(destination, VideoWriter.Fourcc('I', 'Y', 'U', 'V'), fps, new Size(frameWidth, frameHeight), true);
                fileChanged = false;
            }


            Mat m = new Mat();
            videoCapture.Retrieve(m);
            pictureBox1.Image = m.ToImage<Bgr, byte>().Bitmap;
            videoWriter.Write(m);
        }

在上面的代码中，由于我需要将视频保存到多个文件中，我正在重新初始化 video-writer。对于单个文件，它应该初始化一次。

我尝试了多个压缩代码，但以下对我有用

压缩码 VideoWriter.Fourcc('I', 'Y', 'U', 'V')

videoWriter = new VideoWriter(destination, VideoWriter.Fourcc('I', 'Y', 'U', 'V'), fps, new Size(frameWidth, frameHeight), true);

希望对你有帮助

【讨论】：