主要介绍了Java获取视频时长、总帧数，并按照时间或者帧进行截图，希望对大家的学习有所帮助！

1、Maven依赖

<!--start:视频获取某一帧的图片-->
<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv</artifactId>
    <version>1.4.3</version>
</dependency>
<dependency>
    <groupId>org.bytedeco.javacpp-presets</groupId>
    <artifactId>ffmpeg-platform</artifactId>
    <version>4.0.2-1.4.3</version>
</dependency>

2、代码示例 

package com.wav.utils;

import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;

/**
 * @author summer
 * @date 2023-10-24 15:48
 */
public class VideoToImageUtil {

    public static final Logger log = LoggerFactory.getLogger(VideoToImageUtil.class);
    /**
     * 获取视频第一帧
     *
     * @param videoPath 视频地址
     * @param imgPath   生成图片的名字(包含全路径)
     * @throws Exception
     */
    public static void getVideoPicture(String videoPath, String imgPath) throws Exception{
        File imgFile = new File(imgPath);
        //判断保存的文件的文件夹是否存在，不存在创建。
        if (!imgFile.getParentFile().exists()) {
            log.info("保存文件的文件夹不存在，创建。");
            imgFile.getParentFile().mkdirs();
        }

        File videoFile = new File(videoPath);
        if (videoFile.exists()) {
            log.info("视频存在：{}", videoFile);
            //实例化“截取视频首帧”对象
            FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videoFile);
            ff.start();
            int width = ff.getImageWidth();
            int height = ff.getImageHeight();
            System.out.println("宽：" + width + "；高：" + height);

            long ftp = ff.getLengthInFrames();
            System.out.println("一共有：" + ftp + "帧");
            // 视频帧率
            double videoFrameRate = ff.getVideoFrameRate();
            System.out.println("帧率：" + videoFrameRate);
            long delayedTime = ff.getLengthInTime() / 1000000;
            System.out.println("秒数：" + delayedTime);
            int step = 5;
            System.out.println("每隔：" + step + "帧取一帧");
            long count = ftp / step;
            for(long i = 0; i < count; i++){
                System.out.println("截图进度：" + i + "/" +count);
//                long time = (step * (i + 1)) * 1000000L;
//                ff.setTimestamp(time);
                ff.setFrameNumber((int) (step * i + 1));
                Frame f = ff.grabImage();
                //生成文件名称
                String fileName = imgPath + "/" + i + ".jpg";
                System.out.println("截图保存：" +fileName);
                File out = new File(fileName);
                ImageIO.write(frameToBufferedImage(f), "jpg", out);
            }
            ff.close();
            ff.stop();
        } else {
            log.info("视频不存在：{}", videoFile);
        }
    }

    /**
     * 帧转为流
     *
     * @param frame
     * @return
     */

    private static RenderedImage frameToBufferedImage(Frame frame) {
        //创建BufferedImage对象
        Java2DFrameConverter converter = new Java2DFrameConverter();
        BufferedImage bufferedImage = converter.getBufferedImage(frame);
        return bufferedImage;
    }

    public static void main(String[] args) {
        try {
            String videoPath = "E:\\ffmpegTest\\smgnews.mp4";
            String imgPath = "E:\\ffmpegTest\\img\\";
            getVideoPicture(videoPath, imgPath);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

3、运行结果