【EMGU】读取视频AVI文件+保存任意帧为图片

public void VideoCatch(string filepath)
        {
            try
            {
                
                IntPtr CatchFrame =CvInvoke.cvCreateFileCapture(filepath);
                
                CvInvoke.cvNamedWindow("打开视频");
                // 得到总帧数
                CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_COUNT);
                // 视频宽度
                int wd = (int)CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_WIDTH);
                // 视频高度
                int hg = (int) CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_HEIGHT);
                // 当前帧位置
                CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES);
                // 帧频
                CvInvoke.cvGetCaptureProperty(CatchFrame, Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FPS);
                                
                while (true)
                {
                    var FrameImg = CvInvoke.cvQueryFrame(CatchFrame);
                    CvInvoke.cvShowImage("打开视频", FrameImg);

                    Image<Bgr, byte> FramePic = new Image<Bgr, byte>(wd,hg);
                    CvInvoke.cvCopy(FrameImg,FramePic,IntPtr.Zero);
                    

                    int c = CvInvoke.cvWaitKey(20);
                    if (c == 13) break;
                    if (c == 32) 
                    {
                        Random rd = new Random();
                        Bitmap bt = new Bitmap(FramePic.ToBitmap());
                        string picname = rd.Next()+".jpg";
                        bt.Save(picname);
                        Console.WriteLine("保存成功！"+picname);
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
                
            }
        }

验证结果：