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• Using OpenCV on 32-bit XP

  14 novembre 2016, par Aleksandar Rakić

  Is it possible to run OpenCV version 3.0.0 on 32-bit XP ?

  I have successfully compiled code on Win 8.1 64-bit platform but it won’t run on the other computer.

  The code I run is below (it’s only for testing purposes)

  package opencvtest;
  
  
  
  import java.awt.Image;
  
  import java.awt.image.BufferedImage;
  
  import java.awt.image.DataBufferByte;
  
  import javax.swing.ImageIcon;
  
  import javax.swing.JFrame;
  
  import javax.swing.JLabel;
  
  import org.opencv.core.*;
  
  import org.opencv.videoio.VideoCapture;
  
  import org.opencv.videoio.Videoio;
  
  
  
  public class OpenCVtest {
  
  
  
  
  
    private JFrame frame;
  
    private JLabel imageLabel;
  
  
  
   public static void main(String[] args) {
  
      OpenCVtest app = new OpenCVtest();
  
      app.initGUI();
  
      app.runMainLoop(args);
  
    }
  
  
  
    private void initGUI() {
  
      frame = new JFrame("Camera Input Example");  
  
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
  
      frame.setSize(400,400);  
  
      imageLabel = new JLabel();
  
      frame.add(imageLabel);
  
      frame.setVisible(true);       
  
    }
  
  
  
    public static BufferedImage bufferedImage(Mat m) {
  
  
  
  
  
      int type = BufferedImage.TYPE_BYTE_GRAY;
  
      if (m.channels() > 1) {
  
          type = BufferedImage.TYPE_3BYTE_BGR;
  
      }
  
      BufferedImage image = new BufferedImage(m.cols(), m.rows(), type);
  
  
  
      m.get(0, 0, ((DataBufferByte)image.getRaster().getDataBuffer()).getData());
  
      return image;
  
  
  
    }
  
  
  
    private void runMainLoop(String[] args) {
  
      //ImageProcessor imageProcessor = new ImageProcessor();
  
      System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
  
      System.out.println("Welcome to OpenCV version " + Core.VERSION);
  
      Mat webcamMatImage = new Mat();
  
      System.out.println("Mat " + webcamMatImage);
  
      Image tempImage;
  
      VideoCapture capture = new VideoCapture("Highway.mp4");
  
      System.out.println("Capture " + capture);
  
      if(!capture.isOpened()){
  
          System.out.println(capture.open("D:\\AleksandarRakic\\Java Projects\\mavenproject1\\Highway.mp4")?"Otvorio":"Nije otvorio");
  
      }
  
      capture.set(Videoio.CAP_PROP_FRAME_WIDTH,320);
  
      capture.set(Videoio.CAP_PROP_FRAME_HEIGHT,240);
  
  
  
      if( capture.isOpened()){  
  
          while (true){  
  
              capture.read(webcamMatImage);
  
                  if( !webcamMatImage.empty() ){
  
                      int type = BufferedImage.TYPE_BYTE_GRAY;
  
                      if (webcamMatImage.channels() > 1) {
  
                          type = BufferedImage.TYPE_3BYTE_BGR;
  
                      }
  
                      BufferedImage image = new BufferedImage(webcamMatImage.cols(), webcamMatImage.rows(), type);
  
  
  
                      webcamMatImage.get(0, 0, ((DataBufferByte)image.getRaster().getDataBuffer()).getData());
  
  
  
                      tempImage= image;
  
                      ImageIcon imageIcon = new ImageIcon(tempImage, "Captured video");
  
                      imageLabel.setIcon(imageIcon);
  
                      frame.pack();  //this will resize the window to fit the image
  
                  }  
  
                  else{
  
                      System.out.println(" -- Frame not captured -- Break!");
  
                      break;  
  
                  }
  
          }
  
      }
  
      else{
  
          System.out.println("Couldn't open capture.");
  
      }
  
    }
  
  
  
  }

  When I run it on XP, VideoCapture constructor fails to open the video designated. From my understanding, opencv uses it’s own ffmpeg .dll as a codec. Is this true ?

  If not, is it using the codec I have from K-Lite cp ?

  Finally, could anything else be wrong ?

  My %path% variable contains the locations to opencv_ffmpeg300.dll and openvc_java300.dll on WinXP. I also added the following to NetBeans run parameter

  -Djava.library.path="C :\opencv\build\x86\vc12\bin ;C :\opencv\build\java\x86"

• Determining Icecast2 version in current repository

  6 juillet 2016, par dbmitch

  I’ve been playing with streaming audio to icecast server from a Raspberry Pi 3 running Raspbian Jessie Lite. In an old post on the Raspberry Pi Forum a user pointed out the solution to streaming from ffmpeg to icecast was to use the -legacy_icecast 1 parameter

  The reason was

  "that Icecast2 from the repository is version 2.3.2"

  Now I’ve found a command that tells me the latest version available in the repository is 2.4.0-1.1+deb8u1

  The question I have is two part :

  1. How do I tell what version is in my current build ?
  2. If I want to use a newer icecast version in my compiled ffmpeg
     version or the currently installed avconv, will I need to recompile
     either or both, or will they use the new icecast automatically ?

  Thanks for any pointers

• Qt 5.2 / OpenCV 2.4.8 - Can’t open video files via VideoCapture

  4 août 2015, par Zamahra

  I have a big problem that i can’t solve by myself. OpenCV itself works fine, but i’m not able to load videos. Here’s my code :

  PRO- File

  QT       += core gui
  
  
  
  greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
  
  
  
  TARGET = videoredux
  
  TEMPLATE = app
  
  
  
  INCLUDEPATH += C:/OpenCV/opencv_bin/install/include
  
  LIBS += -LC:\\OpenCV\\opencv_bin\\bin \
  
      libopencv_core248d \
  
      libopencv_highgui248d \
  
      libopencv_imgproc248d \
  
      libopencv_features2d248d \
  
      libopencv_calib3d248d \
  
      libopencv_video248d \
  
  
  
  
  
  SOURCES += main.cpp\
  
          mainwindow.cpp
  
  
  
  HEADERS  += mainwindow.h
  
  
  
  FORMS    += mainwindow.ui

  and the MainWindow Class :

  #include "mainwindow.h"
  
  #include "ui_mainwindow.h"
  
  #include <qfiledialog>
  
  #include <iostream>
  
  #include 
  
  #include <opencv2></opencv2>core/core.hpp>
  
  #include <opencv2></opencv2>highgui/highgui.hpp>
  
  #include <opencv2></opencv2>imgproc/imgproc.hpp>
  
  #include <opencv></opencv>cv.h>
  
  
  
  
  
  MainWindow::MainWindow(QWidget *parent) :
  
  QMainWindow(parent),
  
  ui(new Ui::MainWindow)
  
  {
  
      ui->setupUi(this);
  
      ui->videoStatusLabel->setText("Kein Video geladen.");
  
  
  
      // SIGNALS &amp; SLOTS
  
  
  
      QObject::connect(ui->chooseVideoButton,SIGNAL(clicked()),
  
                   this,SLOT(chooseVideo()));
  
      QObject::connect(ui->startButton,SIGNAL(clicked()),
  
                   this,SLOT(startProcess()));
  
  
  
  }
  
  
  
  void MainWindow::chooseVideo(){
  
  
  
      QString fileName = QFileDialog::getOpenFileName(this,
  
           tr("Open Video"), "/home", tr("Video Files (*.avi *.mp4 *.mpeg *.mpg)"));
  
      qDebug() &lt;&lt; "Path:" &lt;&lt; fileName;
  
      ui->videoStatusLabel->setText(fileName);
  
  }
  
  
  
  void MainWindow::startProcess(){
  
      QString videoPath = ui->videoStatusLabel->text();
  
      QFileInfo video(videoPath);
  
      if(video.exists()){
  
          const std::string path = videoPath.toUtf8().constData();
  
          cv::VideoCapture capture(path);
  
          cv::Mat frame;
  
  
  
          if(!capture.isOpened()){
  
              qDebug() &lt;&lt; "Error, video not loaded";
  
          }
  
  
  
          cv::namedWindow("window",1);
  
          while(true)
  
          {
  
              bool success = capture.read(frame);
  
              if(success == false){
  
                  break;
  
              }
  
              cv::imshow("window",frame);
  
              cv::waitKey(20);
  
          }
  
          cv::waitKey(0);
  
      }
  
      else{
  
          qDebug() &lt;&lt; "Error, File doesn't exist";
  
      }
  
  }
  
  </iostream></qfiledialog>

  The paths are correct, I tried many different video formats but he never loads the videos. I’m running Qt on a Windows 8 machine and i have “K-Lite Codec Pack 10.2.0 Basic” and ffmpeg installed. The videos are playing properly with my video players. I also tried to copy the .dll to the working directory, searched for opencv dll’s in the system32 directory and rebuild OpenCV with mingw on this computer. I know that many people have the same problems, but none of their suggestions solved it. Does anyone know how to solve this problem ?

  Thank you very much !

  Nadine

  ----UPDATE---- I still can’t open video files, so I programmed the application on a Windows7 64-Bit system. It worked fine, but when I try to open the application on a Windows8 computer it still can’t open the file. It doesn’t matter which codecs are installed, because it generally runs on every Windows7 computer and fails on every Windows8 computer.. The same for older OpenCV-Versions. Is there a general problem with OpenCV and Windows8 ?