java中怎么从视频里面提取音频

    <!-- https://mvnrepository.com/artifact/ws.schild/jave-core -->
		<dependency>
			<groupId>ws.schild</groupId>
			<artifactId>jave-core</artifactId>
			<version>3.1.1</version>
		</dependency>
     <!-- 以下依赖根据系统二选一 -->
     <!-- win系统平台的依赖 -->
		<dependency>
			<groupId>ws.schild</groupId>
			<artifactId>jave-nativebin-win64</artifactId>
			<version>3.1.1</version>
		</dependency>
     <!-- linux系统平台的依赖 -->
		<dependency>
			<groupId>ws.schild</groupId>
			<artifactId>jave-nativebin-linux64</artifactId>
			<version>3.1.1</version>
		</dependency>

 import ws.schild.jave.Encoder;
import ws.schild.jave.EncoderException;
import ws.schild.jave.MultimediaObject;
import ws.schild.jave.encode.AudioAttributes;
import ws.schild.jave.encode.EncodingAttributes;
 
import java.io.File;
import java.util.Arrays;

//java项目www.fhadmin.org
public class VideoToAudio {
 
 
    //要输出的音频格式
    private static String outputFormat="mp3";
 
 
    /**
     * 获得转化后的文件名
     * @param sourceFilePath : 源视频文件路径
     * @return
     */
    public static String  getNewFileName(String sourceFilePath) {
        File source = new File(sourceFilePath);
        String fileName=source.getName().substring(0, source.getName().lastIndexOf("."));
        return fileName+"."+outputFormat;
    }
 
    /**
     * 转化音频格式
     * @param sourceFilePath : 源视频文件路径
     * @param targetFilePath : 目标音乐文件路径
     * @return
     */
    public static void transform(String sourceFilePath, String targetFilePath) {
        File source = new File(sourceFilePath);
        File target = new File(targetFilePath);
        // 设置音频属性
        AudioAttributes audio = new AudioAttributes();
        audio.setCodec(null);
        // 设置转码属性
        EncodingAttributes attrs = new EncodingAttributes();
        attrs.setOutputFormat(outputFormat);
        attrs.setAudioAttributes(audio);
        try {
            // 音频转换格式类
            Encoder encoder = new Encoder();
            MultimediaObject mediaObject=new MultimediaObject(source);
            encoder.encode(mediaObject, target, attrs);
            System.out.println("转换已完成...");
        }  catch (EncoderException e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 批量转化音频格式
     * @param sourceFolderPath : 源视频文件夹路径
     * @param targetFolderPath : 目标音乐文件夹路径
     * @return
     */
    public static void batchTransform(String sourceFolderPath, String targetFolderPath) {
        File sourceFolder = new File(sourceFolderPath);
        if(sourceFolder.list().length!=0){
            Arrays.asList(sourceFolder.list()).forEach(e->{
              transform(sourceFolderPath+"\"+e, targetFolderPath+"\"+getNewFileName(e));
            });
        }
    }
 
 
 
    public static void main(String[] args) {
        batchTransform("C:\Users\tarzan\Desktop\video","C:\Users\tarzan\Desktop\audio");
    }
 
 
 
 
}