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• Sync video clip using audio waveform

  10 octobre 2015, par Jean-Philippe Encausse

  I have 2 camera recording the same scene (but not with the same audio quality)

  • I have 2 videos clips V1 and V2 recorded from each cameras.
  • I want to find the delay D between the 2 clips V1 and V2 using the recorded audio.

  Is there a simple way to do this using FFMpeg or NAudio (C#) or ?

  I assume the algorithm will match some audio feature on Clip1 then find the features on Clip 2 ?

• AttributeError : 'FFmpegAudio' object has no attribute '_process' while trying to play audio from URL

  13 août 2022, par jmcamacho7

  I can't find any solution online and I don't know what's wrong.

  


  My code is : (Not pasting the URL getting since that works fine)

  


  from urllib import parse, request
import re
import pafy
from discord import FFmpegPCMAudio, PCMVolumeTransformer

FFMPEG_OPTIONS = {
    'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'
}

@bot.command(pass_context=True)
async def play(ctx, * , search):
  query_string = parse.urlencode({'search_query': search})
  html_content = request.urlopen('http://www.youtube.com/results?' + query_string)
  search_results=re.findall('watch\?v=(.{11})',html_content.read().decode('utf-8'))
  print(search_results[0])
  
  if(ctx.author.voice):
    channel = ctx.message.author.voice.channel
    await ctx.send("https://www.youtube.com/watch?v="+search_results[0])  
    url = "https://www.youtube.com/watch?v="+search_results[0]
    conn = await channel.connect()
    conn.play(discord.FFmpegAudio(url, **FFMPEG_OPTIONS))
  else:
    await ctx.send("Necesitas estar en un canal de audio para usar este comando")


  


  It just gives me this error everytime I try it :

  


  Traceback (most recent call last):
  File "/home/runner/HakuBot/venv/lib/python3.8/site-packages/discord/player.py", line 103, in __del__
    self.cleanup()
  File "/home/runner/HakuBot/venv/lib/python3.8/site-packages/discord/player.py", line 154, in cleanup
    proc = self._process
AttributeError: 'FFmpegAudio' object has no attribute '_process'


  


  Anyway to solve this ?

  


• 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.