java - 如何获取上传视频文件的缩略图？

Question

几天来我一直在尝试为上传的文件创建缩略图，但没有成功。我尝试过 Xuggler、FFMpegFrameGrabber 和其他一些随机代码，但似乎都不起作用。从视频中捕获单个帧应该是一项微不足道的任务。有人知道我该怎么做吗？

Answer 1

package com.tape.controller;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import javax.imageio.ImageIO;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.OpenCVFrameGrabber;

public class VideoThumbTaker {

    protected String ffmpegApp;

    public VideoThumbTaker(String ffmpegApp)
    {
        this.ffmpegApp = ffmpegApp;
    }

    public void getThumb(String videoFilename, String thumbFilename, int width, int height,int hour, int min, float sec)
      throws IOException, InterruptedException
    {
        ProcessBuilder processBuilder = new ProcessBuilder(ffmpegApp, "-y", "-i", videoFilename, "-vframes", "1",
    "-ss", hour + ":" + min + ":" + sec, "-f", "mjpeg", "-s", width + "*" + height, "-an", thumbFilename);
        Process process = processBuilder.start();
        InputStream stderr = process.getErrorStream();
        InputStreamReader isr = new InputStreamReader(stderr);
        BufferedReader br = new BufferedReader(isr);
        String line;
        while ((line = br.readLine()) != null);
        process.waitFor();
    }

    public static void main(String[] args) throws Exception, IOException
    {
        FFmpegFrameGrabber g = new FFmpegFrameGrabber("C:\\JavaEE\\New Project\\tape\\src\\main\\webapp\\web-resources\\videos\\vid.mp4");
        g.setFormat("mp4");
        g.start();

        for (int i = 0 ; i < 50 ; i++) {
            ImageIO.write(g.grab().getBufferedImage(), "png", new File("C:\\JavaEE\\New Project\\tape\\src\\main\\webapp\\web-resources\\thumbnails\\video-frame-" + System.currentTimeMillis() + ".png"));
        }

         g.stop();
    }
}

我使用 FFMpegFrameGrabber 的 Java 代码来创建视频的缩略图。尝试一下。

Maven 依赖:

<dependency>
   <groupId>org.bytedeco</groupId>
   <artifactId>javacv</artifactId>
   <version>0.8</version>
</dependency>