话不多说，没有套路，直接开搞，抛砖引玉别喷，谢谢

 package com.ruoyi.web.controller.picture;

import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.ffmpeg.global.avutil;

import org.bytedeco.javacv.*;

import  javax .imageio.ImageIO;
import  java .awt.image.BufferedImage;
import java.io. File ;
import java.util. HashMap ;
import java.util.Map;

public class Img2mp4 {


    public  static   void  main(String[] args) throws  Exception  {

         merge AudioAndVideo("D:\\test\\rgbimg2mp4.mp4","D:\\test\\nsyw-20.mp3","D:\\test\\nsyw.mp4");





    }

    
    public static boolean mergeAudioAndVideo(String videoPath, String audioPath,  String  outPut) throws Exception {
         boolean  isCreated = true;
        File file = new File(videoPath);
         if  (!file. exists ()) {
            return false;
        }
         Frame Recorder 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 ;
            //先录入视频
            while ((frame1 = grabber1.grabFrame()) != null ){
                recorder.record(frame1);
            }
            //然后录入音频
            while ((frame2 = grabber2.grabFrame()) != null) {
                recorder.record(frame2);
            }
            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 isCreated;

    }

}