1、maven的pom.xml文件中导入相应的配置下载jar包

      <!-- javacv视频音频工具包 -->
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv</artifactId>
            <version>1.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.5.2</version>
        </dependency>

2、上面的jar包会下载的很慢很慢，想快的话需要在maven的仓库setting.xml配置阿里的镜像下载

<mirror>
      <id>alimaven</id>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</mirror>

3、工具类代码

package com.chindle.edu.educommon.util;


import org.bytedeco.javacv.*;

import java.io.File;


/**
 * @className:MergeMovieAndVoiceDemo
 * @Author:cong
 * @Date:2020/7/9 9:17
 * @Description: 消音视频和配音的合成
 */
public class MergeMovieAndVoiceUtil {
    public static String mergeAudioAndVideo(String videoPath, String audioPath, String outPut) throws Exception {
        File file = new File(videoPath);
        FrameRecorder recorder = null;
        FrameGrabber grabber1 = null;
        FrameGrabber grabber2 = null;
        try {
            //抓取视频帧
            grabber1 = new FFmpegFrameGrabber(videoPath);
            //抓取音频帧
            grabber2 = new FFmpegFrameGrabber(audioPath);
            grabber1.start();
            grabber2.start();
            //创建录制
            recorder = new FFmpegFrameRecorder(outPut,
                    grabber1.getImageWidth(), grabber1.getImageHeight(),
                    grabber2.getAudioChannels());
            recorder.setFormat("mp4");
            recorder.setFrameRate(grabber1.getFrameRate());
            recorder.setSampleRate(grabber2.getSampleRate());
            recorder.start();
            Frame frame1;
            Frame frame2;
            //然后录入音频
            while ((frame2 = grabber2.grabFrame()) != null) {
                recorder.record(frame2);
            }
            //先录入视频
            while ((frame1 = grabber1.grabFrame()) != null) {
                recorder.record(frame1);
            }
            grabber1.stop();
            grabber2.stop();
            recorder.stop();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (recorder != null) {
                    recorder.release();
                }
                if (grabber1 != null) {
                    grabber1.release();
                }
                if (grabber2 != null) {
                    grabber2.release();
                }
            } catch (FrameRecorder.Exception e) {
                e.printStackTrace();
            }
        }
        return outPut;
    }

    public static void main(String[] args) throws Exception {
        String movie = "C:/Users/welcome/Desktop/2.avi";
        String audio = "C:/Users/welcome/Desktop/1.mp3";
        String resultPath = "C:/Users/welcome/Desktop/1/d.mp4";
        mergeAudioAndVideo(movie, audio, resultPath);
    }
}