多张图片合成一个mp4的视频

maven配置阿里云镜像，包比较大

一、依赖

<dependency>
  <groupId>org.bytedeco</groupId>
  <artifactId>javacv-platform</artifactId>
  <version>1.5.4</version>
</dependency>

二、工具类

package com.cc.demo.unit;
import org.bytedeco.ffmpeg.global.avutil;
import org.bytedeco.javacv.FFmpegFrameRecorder;
import org.bytedeco.javacv.FrameRecorder;
import org.bytedeco.javacv.Java2DFrameConverter;
import org.bytedeco.ffmpeg.global.avcodec;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

public class videoUtil {
    public static void createmp4(String outpath, String inputpath, int time) throws FrameRecorder.Exception {
        File folder = new File(outpath);
        if (!folder.exists()) {
            folder.mkdirs();
        }
        //合成的MP4
        String mp4SavePath = outpath + System.currentTimeMillis() + ".mp4";
        int width = 1600;
        int height = 900;
        //读取所有图片
        File file = new File(inputpath);
        File[] files = file.listFiles();
        Map<Integer, File> imgMap = new HashMap<Integer, File>();
        int num = 0;
        for (File imgFile : files) {
            imgMap.put(num, imgFile);
            num++;
        }
        create(mp4SavePath, imgMap, width, height, time);
    }

    private static void create(String mp4SavePath, Map<Integer, File> imgMap, int width, int height, int time) throws FrameRecorder.Exception, FrameRecorder.Exception {
        //视频宽高最好是按照常见的视频的宽高  16：9  或者 9：16
        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(mp4SavePath, width, height);
        //设置视频编码层模式
        recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
        //设置视频为25帧每秒
        recorder.setFrameRate(25);
        //设置视频图像数据格式
        recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P);
        recorder.setFormat("mp4");
        try {
            recorder.start();
            Java2DFrameConverter converter = new Java2DFrameConverter();
            //根据文件数量定义视频时长
            for (int i = 0; i < imgMap.size(); i++) {
                BufferedImage read = ImageIO.read(imgMap.get(i));
                for (int j = 0; j < 25 * time; j++) {
                    recorder.record(converter.getFrame(read));
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //最后一定要结束并释放资源
            recorder.stop();
            recorder.release();
        }
    }
}

三、测试

package com.xx.demo;

import com.xx.demo.unit.videoUtil;
import org.bytedeco.javacv.FrameRecorder;
import org.junit.jupiter.api.Test;


class DemoApplicationTests {

    @Test
    void contextLoads() throws FrameRecorder.Exception {
        //输入文件目录
        String img = "C:\\Users\\yjtzf\\Desktop\\file";
        //输出文件目录
        String mp4SavePath = "C:\\Users\\yjtzf\\Desktop\\mp4\\";
        //每张图片显示时间
        int time=3;
        videoUtil.createmp4(mp4SavePath,img,time);
    }

}

5张图片，每张3秒，共15秒。