Emgu 学习(2) 视频文件播放

「爱情、让人受尽委屈。」 2021-10-01 00:38 208阅读 0赞

## 播放AVI视频文件 ##

static void Main(string[] args)
            {
                CvInvoke.NamedWindow("TestVideo", NamedWindowType.AutoSize);
                VideoCapture cap=new VideoCapture("test.avi");
                Mat frame = new Mat();
                for (; ; )
                {
                    cap.Read(frame);
                    if (frame.IsEmpty) break;
                    CvInvoke.Imshow("TestVideo", frame);
                    if (CvInvoke.WaitKey(33) >= 0)
                        break;
                }
                return;
            }

![1550027-20190326084453747-595554024.png][]

## 读取摄像头 ##

代码如上，修改VideoCapture的构造参数，0 表示第一个摄像头，1表示第二个。。

new VideoCapture(0);

##  保存视频流为AVI文件到本地 ##

static void Main(String[] args)
            {
                CvInvoke.NamedWindow("bgr", NamedWindowType.AutoSize);
                CvInvoke.NamedWindow("polar", NamedWindowType.AutoSize);
                VideoCapture cap = new VideoCapture(0);
                double fps = cap.GetCaptureProperty(CapProp.Fps);
                Size size=new Size((int)cap.GetCaptureProperty(CapProp.FrameWidth),
                    (int)cap.GetCaptureProperty(CapProp.FrameHeight));
                VideoWriter writer = new VideoWriter("Hello.avi", (int)fps, size,true);
                Mat logpolar = new Mat();
                Mat bgr = new Mat();
                for (; ; )
                {
                    cap.Read(bgr);
                    if (bgr.IsEmpty)
                        return;
                    CvInvoke.Imshow("bgr", bgr);
                    CvInvoke.LogPolar(
                        bgr, logpolar, new PointF(bgr.Cols / 2, bgr.Rows / 2), 40);
                    CvInvoke.Imshow("polar", logpolar);
                    writer.Write(logpolar);
                    int c = CvInvoke.WaitKey(10);
                    if (c == 27)
                        break;
                }
                cap.Dispose();
    
            }

转载于:https://www.cnblogs.com/noigel/p/10598030.html

[1550027-20190326084453747-595554024.png]: /images/20210724/c95dcf426ea14380a5006a81b597e31f.png