FFmpeg Java截取图片

package cn.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class Ffmpeg {
    public static void main(String[] args) {

//        ffmpeg -i rtsp://127.0.0.1/vod/mp4://BigBuckBunny_175k.mov -r 0.2 d:\\1\\images%05d.jpg

List<String> commend = new ArrayList<String>();
        commend.add("ffmpeg");
        commend.add("-i");
        commend.add("rtmp:http://127.0.0.1/vod/mp4://BigBuckBunny_175k.mov");//视频
commend.add("-y");
        commend.add("-f");
        commend.add("image2");
        commend.add("-r");//添加参数“-r",该参数指定截取图片间隔时间
commend.add("0.2");//添加参数“-r",该参数指定截取图片间隔2秒
//        commend.add("-ss");// 添加参数＂-ss＂，该参数指定截取的起始时间
//        commend.add("10");// 添加起始时间为第10秒
//        commend.add("-t");// 添加参数＂-t＂，该参数指定持续时间
//        commend.add("0.001");// 添加持续时间为1毫秒
commend.add("-s"); // 添加参数＂-s＂，该参数指定截取的图片大小
commend.add("800*280"); // 添加截取的图片大小为350*240
commend.add("d:\\1\\images%05d.jpg");
        ProcessBuilder builder = new ProcessBuilder();
        builder.command(commend);
        try {
            builder.redirectErrorStream(true);
            Process process = builder.start();
            InputStream in = process.getInputStream();
            System.out.println("正在进行截图，请稍候=======================");
            convertStreamToString(in);
            InputStream errorStream = process.getErrorStream();
            if (errorStream != null && errorStream.read() > 0) {
                System.out.println("错误：");
                convertStreamToString(errorStream);
            }
            in.close();
        } catch (IOException e) {
            System.out.println("错误：");
            e.printStackTrace();
        }
    }

    public static String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
                sb.append(line + "/n");
            }
        } catch (IOException e) {

            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();

    }

}