FFMpeg video duration

1. 代码

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;


public class FFMPEGDurationer {
    private static final String infoPath = "c:\MediaInfo\";

    public static String inform(String fileName) {
        fileName = fileName.replaceAll("/", "\\");
        String cmd = infoPath + "ffmpeg -i " + fileName;
        try {
            Process proc = Runtime.getRuntime().exec(cmd);
            InputStream out = proc.getErrorStream();
            BufferedReader in = new BufferedReader(new InputStreamReader(out));
            String line = "";
            StringBuffer sb = new StringBuffer();
            if(in.readLine()!= null){
                while((line=in.readLine()) != null){
                    if(line.equals("")||line.indexOf("Duration:")==-1)
                        continue;
                    
                    sb.append(line.trim());
                }
            }
            
            return sb.toString();
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
        
    }
    
    public static long getDuration(String fileName){
        String info = inform(fileName);
        String str = select(info);        
        return parseLong(str);
    }
    
    private static String select(String info){
        String[] infos = info.split(",");
        if(infos.length==0)
            return "";
        
        for(int i=0;i<infos.length;i++){
            String str = infos[i].trim();
            if(str.indexOf("Duration")!=-1){
                String dur = str.substring(str.indexOf(":")+2);
                return dur;
            }
        }
        
        return "";
    }
    
    /**
     *duration String eg. 8s 160ms      /   1h 37mn; 
     */
    public static long parseLong(String duration){
        if(duration==null||duration.equals(""))
            return 0;
        if("N/A".equals(duration))
            return 0;
        
        int ms = 0;        
        int p = duration.lastIndexOf(".");
        if(p!=-1){
            String tmp = duration.substring(p+1);
            tmp = "0." + tmp;
            ms = (int)(Float.parseFloat(tmp)*1000);
        }
        int fr = ms*25/1000;
        String frstr = String.format("%02d", fr);      
        try {
            String _dur = duration.substring(0,p) + ":" + frstr;
            return Long.parseLong(_dur);
        } catch (Exception e) {
            return 0;
        }
        
    }

    public static void main(String[] args) {
        long str = FFMPEGDurationer.getDuration("d:\a.wmv");
//        long str = FFMPEGDurationer.getDuration("x:\av\555_MPEG.m2t");
        System.out.println(str);
    }

}

2. 软件安装 FFmpeg 路径(c:/MediaInfo)