Ffmpeg demo

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本文介绍了一个Java工具类FfmpegUtil，用于从视频中提取指定帧并保存为图片，同时提供了生成视频缩略图的功能。该工具利用FFmpegFrameGrabber组件实现视频帧的读取，并通过调整命令参数实现对视频内容的有效提取。

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package com.ai.runner.dmp.util;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.InputStream;
import java.util.List;
import java.util.UUID;

import javax.imageio.ImageIO;

import org.bytedeco.javacpp.opencv_core.IplImage;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
/**
 * FfmpegUtil <br>
 * Date: 2017-10-19 上午 10:55 <br>
 * Copyright (c) 2017 asiainfo.com <br>
 * 
 * @author xuyw
 */
public class FfmpegUtil {
    static{

    }
    /**
     * 获取视频缩略图
     * @param videoRealPath
     * @param imagePath
     * @param imageName
     * @return
     */
    public static boolean createThumbnail(String videoRealPath,
            String imageRealPath) {

        List<String> commend = new java.util.ArrayList<String>();
        commend.add("D:\\tool\\ffmpeg\\ffmpeg.exe");
        commend.add("-i");
        commend.add(videoRealPath);
        commend.add("-y");
        commend.add("-f");
        commend.add("image2");
        commend.add("-t");
        commend.add("0.011");
        commend.add("-s");
        commend.add("350*240");
        commend.add(imageRealPath);
        boolean isSuccess = true;
        try {

            ProcessBuilder builder = new ProcessBuilder();

            builder.command(commend);

            builder.redirectErrorStream(true);

            Process process = builder.start();

            InputStream in = process.getInputStream();

            byte[] re = new byte[1024];

            while (in.read(re) != -1) {

            }

            in.close();

        } catch (Exception e) {
            isSuccess = false;
            e.printStackTrace();

        }
        return isSuccess;

    }
    /**
     * 获取指定视频的帧并保存为图片至指定目录
     * @param videofile  源视频文件路径
     * @param framefile  截取帧的图片存放路径
     * @throws Exception
     */
    public static void fetchFrame(String videofile, String framefile)
            throws Exception {
        long start = System.currentTimeMillis();
        File targetFile = new File(framefile);
        FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videofile); 
        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 > 130) && (f.image != null)) {
                break;
            }
            i++;
        }
        IplImage img = f.image;
        int owidth = img.width();
        int oheight = img.height();
        // 对截取的帧进行等比例缩放
        int width = 350;
        int height = (int) (((double) width / owidth) * oheight);
        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
        bi.getGraphics().drawImage(f.image.getBufferedImage().getScaledInstance(width, height, Image.SCALE_SMOOTH),
                0, 0, null);
        ImageIO.write(bi, "jpg", targetFile);
        //ff.flush();
        ff.stop();
        System.out.println(System.currentTimeMillis() - start);
    }
    public static void main(String[] args) throws Exception {
        String videoRealPath = "D:\\4d70eff7c1f3402e9341dbbd3d1b665c.mp4";
        String imagePath = "D:\\test\\"+ UUID.randomUUID().toString() + ".jpg";

        FfmpegUtil.fetchFrame(videoRealPath,imagePath);
        //System.out.println(System.getenv("java.library.path"));
         imagePath = "D:\\test\\"+ UUID.randomUUID().toString() + ".jpg";
        FfmpegUtil.createThumbnail(videoRealPath,imagePath);
    }
}