利用FFmpegFrameGrabber截取视频首帧图片

1.在pom.xml文件导入依赖：

<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv</artifactId>
    <version>1.4.4</version>
    <exclusions>
        <exclusion>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacpp</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>flycapture</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>libdc1394</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>libfreenect</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>libfreenect2</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>librealsense</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>videoinput</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>opencv</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>tesseract</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>leptonica</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>flandmark</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>artoolkitplus</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv-platform</artifactId>
    <version>1.4.4</version>
    <exclusions>
        <exclusion>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>flycapture-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>libdc1394-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>libfreenect-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>libfreenect2-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>librealsense-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>videoinput-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>opencv-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>tesseract-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>leptonica-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>flandmark-platform</artifactId>
        </exclusion>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>artoolkitplus-platform</artifactId>
        </exclusion>
    </exclusions>
</dependency>

2.截取手首帧的工具类方法：
 

package com.example.demo;


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

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;

/**
 * @author: 何志鹏
 * @date: 2020-04-29 16:10
 */
public class VideoUtil {

    public static File getVideoPic(File video, String picPath) {
        FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
        try {
            ff.start();
            int lenght = ff.getLengthInFrames();
            int i = 0;
            Frame f = null;
            while (i < lenght) {
                // 过滤前5帧，避免出现全黑的图片，依自己情况而定
                f = ff.grabFrame();
                if ((i > 5) && (f.image != null)) {
                    break;
                }
                i++;
            }

            // 截取的帧图片
            Java2DFrameConverter converter = new Java2DFrameConverter();
            BufferedImage srcImage = converter.getBufferedImage(f);
            int srcImageWidth = srcImage.getWidth();
            int srcImageHeight = srcImage.getHeight();

            // 对截图进行等比例缩放(缩略图)
            int width = 480;
            int height = (int) (((double) width / srcImageWidth) * srcImageHeight);
            BufferedImage thumbnailImage = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
            thumbnailImage.getGraphics().drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);

            File picFile = new File(picPath);
            ImageIO.write(thumbnailImage, "jpg", picFile);

            ff.stop();
            return picFile;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) throws Exception{
        System.out.println(new Date());
//        String videoPath = ResourceUtils.CLASSPATH_URL_PREFIX + "video.mp4";
        URL url = new URL("云服务上的视频地址.mp4");
        URLConnection connection = url.openConnection();
        InputStream inputStream = connection.getInputStream();
        File video = new File("video.mp4");
        OutputStream outputStream = new FileOutputStream(video);
        int bytesRead = 0;
        byte[] buffer = new byte[8192];
        while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        outputStream.close();
        inputStream.close();
        String picPath = "video.jpg";
        getVideoPic(video, picPath);
        video.delete();
        System.out.println(new Date());
//        System.out.println(videoPath);
    }
}

3.以上运行main方法，我的云服务器上视频是如下这样的：

4.运行main方法之后截取的图片是该视频的首帧图片   如下：