(1)slf4j-api-1.7.7.jar
(2)slf4j-simple-1.7.7.jar
(3)xuggle-xuggler-5.4.jar

import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.IMediaWriter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.xuggler.ICodec;

public class VideoToAudio{

    public void convertVideoToAudio(){
        IMediaReader reader = ToolFactory.makeReader("D://vid.mp4");
        IMediaWriter writer = ToolFactory.makeWriter("D://a.mp3",reader);

        int sampleRate = 44100;
        int channels = 1;

        writer.addAudioStream(0, 0, ICodec.ID.CODEC_ID_MP3, channels, sampleRate);
        while (reader.readPacket() == null);
    }

    public static void main(String [] args){
        VideoToAudio vta = new VideoToAudio();
        try{
            vta.convertVideoToAudio();
        }
        catch(Exception e){
            System.out.println("Could not open video file");
        }
    }
}