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• Using openCV library with Java works well on Linux but not on Windows

  6 août 2016, par user3586330

  I have a method that takes screenshots on absolute intervals (25%, 50%, 75% and 100%) from a video-file and save each of them to a separate .png-file. I use openCV with the JavaCV-Wrapper library to do that. The class/method of interest is :

  package de.stal.videoreporter;
  
  
  
  import org.bytedeco.javacpp.opencv_core;
  
  import static org.bytedeco.javacpp.opencv_imgcodecs.cvSaveImage;
  
  import org.bytedeco.javacv.FFmpegFrameGrabber;
  
  import org.bytedeco.javacv.Frame;
  
  import org.bytedeco.javacv.FrameGrabber;
  
  import org.bytedeco.javacv.OpenCVFrameConverter;
  
  
  
  class VideoThumbnailer {
  
  public void createThumbnails(String videoname) throws FrameGrabber.Exception {
  
  
  
      FFmpegFrameGrabber g = new FFmpegFrameGrabber("videos/" + videoname);
  
      g.start();
  
      OpenCVFrameConverter.ToIplImage converterToIplImage = new OpenCVFrameConverter.ToIplImage();
  
      int length = g.getLengthInFrames();
  
      int fifty = length / 2;
  
      int twentyfive = fifty / 2;
  
      int seventyfive = fifty + twentyfive;
  
      int hundred = length - 1;
  
  
  
      //each frame of video
  
      for (int j = 0; j < length; j++) {
  
  
  
          if (j == twentyfive || j == fifty || j == seventyfive || j == hundred) {
  
              String ss = "";
  
              if (j == twentyfive) {
  
                  ss = "25";
  
              } else if (j == fifty) {
  
                  ss = "50";
  
              } else if (j == seventyfive) {
  
                  ss = "75";
  
              } else if (j == hundred) {
  
                  ss = "100";
  
              }
  
  
  
              g.setFrameNumber(j);
  
  
  
              Frame f = g.grabImage();
  
  
  
              opencv_core.IplImage image = converterToIplImage.convert(f);
  
              String img_path = "thumbnails/" + videoname + "." + ss + ".png";
  
              cvSaveImage(img_path, image);
  
          }
  
  
  
      }
  
      g.stop();
  
  }
  
  }

  That works fine on environment : Ubuntu 15.10 x64, Java v.1.7.0_101 and Netbeans 8.0.2 with Maven. So I exported the project to a runnable jar-file(with all dependencies included) and tried to start it on Windows 10 x64 via :

  java -jar VideoReporter-1.0-SNAPSHOT-jar-with-dependencies.jar

  On Windows an exception will be thrown when executing the .jar-file :

  Error putting member offsets for class org/bytedeco/javacpp/avutil$Pool_free_Pointer.
  
  Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.javacpp.avutil
  
      at java.lang.Class.forName0(Native Method)
  
      at java.lang.Class.forName(Unknown Source)
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:472)
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:417)
  
      at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2719)
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:391)
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:385)
  
      at de.stal.videoreporter.VideoThumbnailer.createThumbnails(VideoThumbnailer.java:15)
  
      at de.stal.videoreporter.MetaReader.slurpMetadata(MetaReader.java:67)
  
      at de.stal.videoreporter.VideoReporter.main(VideoReporter.java:19)
  
  </clinit>

  My pom.xml is :

  <?xml version="1.0" encoding="UTF-8"?>
  
  <project xmlns="http://maven.apache.org/POM/4.0.0">
  
  <modelversion>4.0.0</modelversion>
  
  <groupid>de.stal</groupid>
  
  <artifactid>VideoReporter</artifactid>
  
  <version>1.0-SNAPSHOT</version>
  
  <packaging>jar</packaging>
  
  <properties>
  
      UTF-8
  
      1.7
  
      1.7
  
  </properties>
  
  <build>
  
      <plugins>
  
          <plugin>
  
              <artifactid>maven-assembly-plugin</artifactid>
  
              <configuration>
  
                  <archive>
  
                      <manifest>
  
                          <mainclass>de.stal.videoreporter.VideoReporter</mainclass>
  
                      </manifest>
  
                  </archive>
  
                  <descriptorrefs>
  
                      <descriptorref>jar-with-dependencies</descriptorref>
  
                  </descriptorrefs>
  
              </configuration>
  
              <executions>
  
                  <execution>
  
                      <id>make-assembly</id>
  
                      <phase>package</phase> 
  
                      <goals>
  
                          <goal>single</goal>
  
                      </goals>
  
                  </execution>
  
              </executions>
  
          </plugin>
  
      </plugins>
  
  </build>
  
  <dependencies>
  
      <dependency>
  
          <groupid>org.apache.commons</groupid>
  
          <artifactid>commons-csv</artifactid>
  
          <version>1.1</version>
  
      </dependency>
  
      <dependency>
  
          <groupid>org.bytedeco</groupid>
  
          <artifactid>javacpp</artifactid>
  
          <version>1.2.1</version>
  
      </dependency>
  
      <dependency>
  
          <groupid>org.bytedeco</groupid>
  
          <artifactid>javacv</artifactid>
  
          <version>1.2</version>
  
      </dependency>
  
      <dependency>
  
          <groupid>com.fasterxml.jackson.dataformat</groupid>
  
          <artifactid>jackson-dataformat-csv</artifactid>
  
          <version>2.8.0.rc2</version>
  
      </dependency>
  
      <dependency>
  
          <groupid>javassist</groupid>
  
          <artifactid>javassist</artifactid>
  
          <version>3.12.1.GA</version>
  
      </dependency>
  
      <dependency>
  
          <groupid>commons-collections</groupid>
  
          <artifactid>commons-collections</artifactid>
  
          <version>3.2.1</version>
  
      </dependency>
  
      <dependency>
  
          <groupid>com.opencsv</groupid>
  
          <artifactid>opencsv</artifactid>
  
          <version>3.3</version>
  
      </dependency>
  
  </dependencies>
  
  </project>

  What might be the problem on Windows ? In my opinion there shouldn’t be a problem with access to openCV/FFMPEG-classes because they all have been included the .jar-file ? Is this a problem with the classpath ?

  Thanks, Peter

• Revision 56d048c412 : Moving mv entropy encodings calculation to the encoder side. Moved arrays : vp

  26 novembre 2013, par Dmitry Kovalev

  Changed Paths :
   Modify /vp9/common/vp9_alloccommon.c

  
   Modify /vp9/common/vp9_entropymv.c

  
   Modify /vp9/common/vp9_entropymv.h

  
   Modify /vp9/encoder/vp9_encodemv.c

  
   Modify /vp9/encoder/vp9_encodemv.h

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
  
  Moving mv entropy encodings calculation to the encoder side.

  Moved arrays :
  vp9_mv_joint_encodings
  vp9_mv_class_encodings
  vp9_mv_class0_encodings
  vp9_mv_fp_encodings

  Change-Id : Iaf5008c579fcbd6d77fdd81d1aef8c71b5f308b7

• Revision 7ab9a9587b : Remove Wextra warnings from vp9_sad.c As a side-effect, the max_sad check is re

  13 mai 2014, par Deb Mukherjee

  Changed Paths :
   Modify /test/sad_test.cc

  
   Modify /vp8/common/rtcd_defs.pl

  
   Modify /vp8/common/sad_c.c

  
   Modify /vp8/common/variance.h

  
   Modify /vp8/encoder/mcomp.c

  
   Modify /vp8/encoder/rdopt.c

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_mbgraph.c

  
   Modify /vp9/encoder/vp9_mcomp.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_sad.c

  
   Modify /vp9/encoder/vp9_variance.h

  
  
  Remove Wextra warnings from vp9_sad.c

  As a side-effect, the max_sad check is removed from the
  C-implementation of VP8, for consistency with VP9, and to
  ensure that the SAD tests common to VP8/VP9 pass.
  That will make the VP8 C implementation of sad a little slower
  but given that is rarely used in practice, the impact will be
  minimal.

  Change-Id : I7f43089fdea047fbf1862e40c21e4715c30f07ca