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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Frames capture with Xuggler example

The concept of this tutorial is to open a media file, loop through a specific video stream and at specific intervals capture the corresponding frame, convert it to an image and dump the binary contents into a file. We are going to use Xuggler for that.
 
 
 
 
 
 
 
 
 
Here is the code that describes the above:

package com.javacodegeeks.xuggler;
 
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
 
import javax.imageio.ImageIO;
 
import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.MediaListenerAdapter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.mediatool.event.IVideoPictureEvent;
import com.xuggle.xuggler.Global;
 
public class VideoThumbnailsExample {
    
    public static final double SECONDS_BETWEEN_FRAMES = 10;
 
    private static final String inputFilename = "c:/Java_is_Everywhere.mp4";
    private static final String outputFilePrefix = "c:/snapshots/mysnapshot";
    
    // The video stream index, used to ensure we display frames from one and
    // only one video stream from the media container.
    private static int mVideoStreamIndex = -1;
    
    // Time of last frame write
    private static long mLastPtsWrite = Global.NO_PTS;
    
    public static final long MICRO_SECONDS_BETWEEN_FRAMES = 

  (long)(Global.DEFAULT_PTS_PER_SECOND * SECONDS_BETWEEN_FRAMES);
 
    public static void main(String[] args) {
 

  IMediaReader mediaReader = ToolFactory.makeReader(inputFilename);
 

  // stipulate that we want BufferedImages created in BGR 24bit color space

  mediaReader.setBufferedImageTypeToGenerate(BufferedImage.TYPE_3BYTE_BGR);

  

  mediaReader.addListener(new ImageSnapListener());
 

  // read out the contents of the media file and

  // dispatch events to the attached listener

  while (mediaReader.readPacket() == null) ;
 
    }
 
    private static class ImageSnapListener extends MediaListenerAdapter {
 

  public void onVideoPicture(IVideoPictureEvent event) {
 


if (event.getStreamIndex() != mVideoStreamIndex) {


    // if the selected video stream id is not yet set, go ahead an


    // select this lucky video stream


    if (mVideoStreamIndex == -1)



  mVideoStreamIndex = event.getStreamIndex();


    // no need to show frames from this video stream


    else



  return;


}
 


// if uninitialized, back date mLastPtsWrite to get the very first frame


if (mLastPtsWrite == Global.NO_PTS)


    mLastPtsWrite = event.getTimeStamp() - MICRO_SECONDS_BETWEEN_FRAMES;
 


// if it's time to write the next frame


if (event.getTimeStamp() - mLastPtsWrite >= 



  MICRO_SECONDS_BETWEEN_FRAMES) {





  


    String outputFilename = dumpImageToFile(event.getImage());
 


    // indicate file written


    double seconds = ((double) event.getTimeStamp()) / 



  Global.DEFAULT_PTS_PER_SECOND;


    System.out.printf(




"at elapsed time of %6.3f seconds wrote: %sn",




seconds, outputFilename);
 


    // update last write time


    mLastPtsWrite += MICRO_SECONDS_BETWEEN_FRAMES;


}
 

  }

  

  private String dumpImageToFile(BufferedImage image) {


try {


    String outputFilename = outputFilePrefix + 



   System.currentTimeMillis() + ".png";


    ImageIO.write(image, "png", new File(outputFilename));


    return outputFilename;


} 


catch (IOException e) {


    e.printStackTrace();


    return null;


}

  }
 
    }
 
}

This was an example on how to perform frames capture with Xuggler.

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