后端程序员如何通过java从视频里面提取音频（具体代码如下）

1、在项目pom文件中添加以下依赖

<dependency><groupid>ws.schild</groupid><artifactid>jave-core</artifactid><version>3.1.1</version></dependency>

<!-- 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>

2、把下面代码到Spring boot项目中

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");
  }
}

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