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• Unable to Access IP Camera in OpenCV

  3 janvier 2017, par user7258890

  I’m trying to use Javafx and OpenCV to access a webcam (Axis M1013) over wireless to run vision processing for my FRC team. When I run my code, I can access the GUI that I made using Scenebuilder, but when I try to start the camera, the program crashes. It seems to me like it’s having trouble utilizing the VideoCapture class. I know for a fact that my problem is not with the camera, because i can access the feed through a browser feed, and my laptop’s webcam will work fine. I’m using OpevCV version 2.4.13, jdk 8u101x64, and ffmpeg 3.2

  I have looked at other posts at :

  stackoverflow.com/questions/18625948/opencv-java-unsatisfiedlinkerror

  answers.opencv.org/question/21720/java-webcam-capture

  answers.opencv.org/question/20071/unsatisfiedlinkerror-given-by-highghuiimread-on-java

  I have tried the solutions mentioned in all of these. So far, none have resolved my problem.

  My code is based mostly off the tutorials at :

  opencv-java-tutorials.readthedocs.io/en/latest/03-first-javafx-application-with-opencv.html

  Here is my main java code :

      @Override 
  
  public void start(Stage primaryStage) {
  
      System.load("C:\\opencv\\build\\x64\\vc12\\bin\\opencv_ffmpeg_64.dll");
  
      try {
  
          FXMLLoader loader = new FXMLLoader(getClass().getResource("Sample.fxml"));
  
          BorderPane root = (BorderPane) loader.load();
  
          Scene scene = new Scene(root, 400, 400);
  
          scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
  
          primaryStage.setScene(scene);
  
          primaryStage.show();
  
      } catch(Exception e) {
  
          System.out.println("error opening camera gui");
  
      }
  
  }
  
  
  
  public static void main(String[] args) {
  
      launch(args);
  
  }

  And here is my camera controller :

  public class SampleController {
  
  @FXML
  
  private Button Start_btn;
  
  
  
  @FXML
  
  private ImageView currentFrame;
  
  private ScheduledExecutorService timer;
  
  private VideoCapture capture;
  
  private boolean cameraActive = false;
  
  
  
  @FXML
  
  public void startCamera()
  
  {
  
      System.loadLibrary("opencv_ffmpeg_64");
  
      if (!this.cameraActive)
  
      {
  
          try
  
          {
  
           capture = new VideoCapture("http://FRC:FRC@axis-camera-223-catapult.lan:554/mjpg/1/video.mjpg");
  
          }
  
          catch (Exception e)
  
          {
  
              System.out.println("an error occured when attempting to access camera.");
  
          }
  
          // is the video stream available?
  
          if (this.capture.isOpened())
  
          {
  
              this.cameraActive = true;
  
  
  
              // grab a frame every 33 ms (30 frames/sec)
  
              Runnable frameGrabber = new Runnable() {
  
  
  
                  @Override
  
                  public void run()
  
                  {
  
                      // effectively grab and process a single frame
  
                      Mat frame = grabFrame();
  
                      // convert and show the frame
  
                      Image imageToShow = Utils.mat2Image(frame);
  
                      updateImageView(currentFrame, imageToShow);
  
                  }
  
              };
  
  
  
              this.timer = Executors.newSingleThreadScheduledExecutor();
  
              this.timer.scheduleAtFixedRate(frameGrabber, 0, 33, TimeUnit.MILLISECONDS);
  
  
  
              // update the button content
  
              this.Start_btn.setText("Stop Camera");
  
          }
  
          else
  
          {
  
              // log the error
  
              System.err.println("Impossible to open the camera connection...");
  
          }
  
      }
  
      else
  
      {
  
          // the camera is not active at this point
  
          this.cameraActive = false;
  
          // update again the button content
  
          this.Start_btn.setText("Start Camera");
  
  
  
          // stop the timer
  
          this.stopAquisition();
  
      }
  
  
  
      System.out.println("Camera is now on.");
  
  }
  
  
  
  /**
  
   * Get frame from open video
  
   * @return
  
   */
  
      private Mat grabFrame()
  
  
  
      {
  
          Mat frame = new Mat();
  
          if (this.capture.isOpened())
  
          {
  
              try
  
              {
  
                  this.capture.read(frame);
  
  
  
                  }
  
          catch (Exception e)
  
          {
  
              System.err.println("Exception during the image elaboration: " + e);
  
          }
  
      }
  
      return frame;
  
  }
  
      private void stopAquisition()
  
      {
  
          if (this.timer!=null && !this.timer.isShutdown())
  
          {
  
              try
  
              {
  
                  this.timer.shutdown();
  
                  this.timer.awaitTermination(33, TimeUnit.MILLISECONDS);
  
              }
  
              catch (InterruptedException e)
  
              {
  
                  System.err.println("Exception in stopping the frame capture, trying to release camera now..." + e);
  
  
  
              }
  
          }
  
          if (this.capture.isOpened())
  
          {
  
              this.capture.release();
  
          }
  
      }
  
      private void updateImageView(ImageView view, Image image)
  
      {
  
          Utils.onFXThread(view.imageProperty(), image);
  
      }
  
      protected void setClosed()
  
      { 
  
          this.stopAquisition();
  
      }
  
  }

  When I try and run this as i have said before, the GUI will launch, but when i try and open the camera, i get an error message :

  Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
  
  at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
  
  at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
  
  at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  
  at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  
  at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  
  at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  
  at javafx.event.Event.fireEvent(Event.java:198)
  
  at javafx.scene.Node.fireEvent(Node.java:8411)
  
  at javafx.scene.control.Button.fire(Button.java:185)
  
  at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
  
  at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
  
  at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
  
  at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
  
  at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
  
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  
  at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  
  at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  
  at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  
  at javafx.event.Event.fireEvent(Event.java:198)
  
  at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
  
  at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
  
  at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
  
  at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
  
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
  
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
  
  at java.security.AccessController.doPrivileged(Native Method)
  
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
  
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
  
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
  
  at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
  
  at com.sun.glass.ui.View.notifyMouse(View.java:937)
  
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  
  at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
  
  at java.lang.Thread.run(Unknown Source)
  
  Caused by: java.lang.reflect.InvocationTargetException
  
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  
  at java.lang.reflect.Method.invoke(Unknown Source)
  
  at sun.reflect.misc.Trampoline.invoke(Unknown Source)
  
  at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
  
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  
  at java.lang.reflect.Method.invoke(Unknown Source)
  
  at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
  
  at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
  
  ... 48 more
  
  Caused by: java.lang.UnsatisfiedLinkError:     org.opencv.highgui.VideoCapture.VideoCapture_1(Ljava/lang/String;)J
  
  at org.opencv.highgui.VideoCapture.VideoCapture_1(Native Method)
  
  at org.opencv.highgui.VideoCapture.<init>(VideoCapture.java:128)
  
  at jfxtest1.SampleController.startCamera(SampleController.java:36)
  
  ... 58 more
  
  </init>

  If anyone can help me, that would be much appreciated.

  Thanks in advance.

• Anomalie #2964 : Développement boite d’options inverser

  26 mars 2013, par b b

  Salut et merci pour le signalement, Le problème vient du fait que sous ie, l’event onchange d’un input est lancé après que l’input perde le focus. Du coup notre implémentation est foireuse avec ce comportement, il faut revoir ça. À ce que je lis ici : (...)

• c# what is the best way to record live frames as Video

  13 février 2015, par Balu

  I have been checking around to convert live frames into video. And I found (NReco.VideoConverter) ffmpeg lib to convert live frames to Video, but the problem is it is taking time to write each frame to ConvertLiveMediaTask (async live media task conversion).

  I have an event that provides (raw) frames (1920x1080) (25fps) from IpCamera. Whenever I get frame I am doing the following

  //Image availbale event fired
  
  //...
  
  
  
  //...
  
  // Record video is true
  
  if(record)
  
  {
  
  //////////////############# Time taking part ##############//////////////////////
  
  var bd = frameBmp.LockBits(new Rectangle(0, 0, frameBmp.Width, frameBmp.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);                        
  
    var buf = new byte[bd.Stride * frameBmp.Height];                       
  
    Marshal.Copy(bd.Scan0, buf, 0, buf.Length);
  
    // write to ConvertLiveMediaTask
  
    convertLiveMediaTask.Write(buf, 0, buf.Length); // ffMpegTask
  
    frameBmp.UnlockBits(bd);
  
  //////////////////////////////////////////////////////////////////////////////////
  
  }

  As the above part is taking much time, I am loosing the frames.

  //Stop recording
  
  convertLiveMediaTask.Stop(); //ffMpegTask

  Stop recording, for this part I have used BackgroundWorker, because this takes too smuch time to save the media to file.
  My question is how can I write the frame to ConvertLiveMediaTask in faster way ? are there any possibilites to write it in background ?
  Please give me suggestions.