java截取视频帧

一、通过JavaCV

引入依赖

<dependency>
   <groupId>org.bytedeco</groupId>
   <artifactId>javacv-platform</artifactId>
   <version>1.5.7</version>
</dependency>

工具类

import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;

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

public class JavaCvUtil {

    /**
     * @param videoFilePath 视频文件路径
     * @param outFramePath 输出帧的路径
     * @param frameNum  帧序号，从1开始
     * @return  返回真图片对应的File对象
     */
    public static File getFrameFile(String videoFilePath, String outFramePath, int frameNum) {

        try (FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(videoFilePath)) {
            grabber.start();

            // 获取帧
            Frame frame = null;
            while (frameNum > 0) {
                frame = grabber.grabImage();
                frameNum--;
            }

            // 转换为BufferedImage
            Java2DFrameConverter converter = new Java2DFrameConverter();
            BufferedImage image = converter.getBufferedImage(frame);

            // 保存为图片
            ImageIO.write(image, "jpg", new File(outFramePath));

            System.out.println("帧已保存到: " + outFramePath);
            return new File(outFramePath);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

二、通过ffmpeg命令

首先要下载ffmpeg，配置环境变量，可参考：FFmpeg 超级详细安装与配置教程（Windows 系统）_windows安装ffmpeg-CSDN博客

工具类

import java.io.File;
import java.io.IOException;

public class FfmpegUtil {

    /**
     * @param videoFilePath 视频文件路径
     * @param outFramePath 输出帧的路径
     * @param frameNum  帧序号，从1开始
     * @return  返回真图片对应的File对象
     */
    public static File getFrameFile(String videoFilePath, String outFramePath, int frameNum) {
        try {
            ProcessBuilder pb = new ProcessBuilder(
                    "ffmpeg",
                    "-i", videoFilePath,
                    "-vframes", "1",
                    //  由于ffmpeg的参数select的参数n是0开始，所以这里减1
                    "-vf","select=eq(n\\,%d)".formatted(frameNum - 1),
                    "-q:v", "2",
                    outFramePath
            );

            Process process = pb.start();
            int exitCode = process.waitFor();

            if (exitCode == 0) {
                System.out.println("帧已保存到: " + outFramePath);
            } else {
                System.out.println("截取帧失败");
            }
            return new File(outFramePath);
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }
        return null;
    }
}