java opencv通过rtsp获取视频流，保存视频到本地

• 代码都是来自网络，收集的比较乱，所有找不到出处了。
  获取视频流的核心代码
  private static void testRtsp() {
      //必须要加入这两个东西
      System.load("D:\\opencv-4.1.1\\opencv\\build\\x64\\vc15\\bin\\opencv_world411.dll");
      System.load("D:\\opencv-4.1.1\\opencv\\build\\bin\\opencv_videoio_ffmpeg411_64.dll");
      VideoCapture vc = new VideoCapture();
      boolean isOpen = vc.open("rtsp://admin:[email protected]");
  
      System.out.println("isOpen="+isOpen);
  
      Mat mat = new Mat();
      String winName = "showFrame";
      int height = 600,width = 800;
      HighGui.namedWindow(winName);
      HighGui.resizeWindow(winName, width, height);
      while(vc.read(mat)){
          // 重置大小
          Mat dst = new Mat();
          Imgproc.resize(mat, dst, new Size(width,height));
          // 显示
          HighGui.imshow(winName, dst);
          // waitkey 必须要，否则无法显示
          int key = HighGui.waitKey(1);
          System.out.println("key="+key);
          //esc键退出
          if(key == 27){
              break;
          }
          //拿到了每帧之后要干嘛就是后面逻辑的事情了
      }
      HighGui.destroyAllWindows();
      vc.release();
  }

• 效果
• mat的一些处理方式

//mat转输入流
public static InputStream mat2InputStream(Mat mat){
    MatOfByte mob = new MatOfByte();
    imencode(".jpg", mat, mob);
    byte[] byteArray = mob.toArray();
    return new ByteArrayInputStream(byteArray);
}
//mat转图片
public static void mat2File(Mat mat){
    MatOfByte mob = new MatOfByte();
    imencode(".jpg", mat, mob);
    imwrite("f:\\img\\test.png",mat);
   // byte[] byteArray = mob.toArray();
}

• 通过rtsp保存视频

private static void record(){
    System.load("D:\\opencv-4.1.1\\opencv\\build\\x64\\vc15\\bin\\opencv_world411.dll");
    System.load("D:\\opencv-4.1.1\\opencv\\build\\bin\\opencv_videoio_ffmpeg411_64.dll");
    VideoCapture vc = new VideoCapture();
    boolean isOpen = vc.open("rtsp://admin:[email protected]");
    System.out.println("isOpen="+isOpen);
    Mat mat = new Mat();
    VideoWriter vw = new VideoWriter();
    Size size  = new Size();
    size.width = vc.get(CAP_PROP_FRAME_WIDTH);
    size.height = vc.get(CAP_PROP_FRAME_HEIGHT);
    boolean t = vw.open("f:\\img\\test.avi",VideoWriter.fourcc('M', 'P', '4', '2'),30,size);
    System.out.println("开启状态："+t);
    int times = 400;//测试录制时间
    while(times-->0 && vc.read(mat)){
        vw.write(mat);
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    vc.release();
    vw.release();
    System.out.println("结束");
}
效果