Java：视频按帧进行截图

ゝ一世哀愁。 2024-02-20 11:12 62阅读 0赞

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 ##

>     
>     <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 ##

![630827ea1add45d5a1a4a3316f9bff21.png][]

[630827ea1add45d5a1a4a3316f9bff21.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/55e0e26d4f6347b5b08487899c11e888.png