Java调用ffmpeg进行视频转码

import java.io.*;

import java.lang.*;

import java.util.*;

import java.text.*;

import java.net.*;

public class MediocreExecJavac {

public void runCmd(String command) {

try {

Runtime rt = Runtime.getRuntime();

Process proc = rt.exec(command);

InputStream stderr = proc.getErrorStream();

InputStreamReader isr = new InputStreamReader(stderr);

BufferedReader br = new BufferedReader(isr);

String line = null;

while ( (line = br.readLine()) != null)

System.out.println(line);

int exitVal = proc.waitFor();

System.out.println("Process exitValue: " + exitVal);

} catch (Throwable t) {

t.printStackTrace();

}

}

public boolean transfer(String infile,String outfile) {

String avitoflv = "ffmpeg -i "+infile+" -ar 22050 -ab 56 -f flv -y -s 320x240 "+outfile;

String flvto3gp = "ffmpeg -i " + infile + " -ar 8000 -ac 1 -acodec amr_nb -vcodec h263 -s 176x144 -r 12 -b 30 -ab 12 " + outfile;

String avito3gp = "ffmpeg -i " + infile + " -ar 8000 -ac 1 -acodec amr_nb -vcodec h263 -s 176x144 -r 12 -b 30 -ab 12 " + outfile;

String avitojpg = "ffmpeg -i " + infile + " -y -f image2 -ss 00:00:10 -t 00:00:01 -s 350x240 " + outfile;

try {

Runtime rt = Runtime.getRuntime();

Process proc = rt.exec(avitoflv);

InputStream stderr = proc.getErrorStream();

InputStreamReader isr = new InputStreamReader(stderr);

BufferedReader br = new BufferedReader(isr);

String line = null;

while ( (line = br.readLine()) != null)

System.out.println(line);

int exitVal = proc.waitFor();

System.out.println("Process exitValue: " + exitVal);

} catch (Throwable t) {

t.printStackTrace();

return false;

}

return true;

}

public static String readFile(String fileName,int id) {

String dataStr = "";

FileInputStream fis = null;

try {

FileReader file = new FileReader(fileName);//建立FileReader对象，并实例化为fr

BufferedReader br=new BufferedReader(file);//建立BufferedReader对象，并实例化为br

String Line=br.readLine();//从文件读取一行字符串

dataStr=Line;

br.close();//关闭BufferedReader对象

} catch(Exception e) {

} finally {

try {

if(fis!=null)

fis.close();

} catch(Exception e) {}

}

return dataStr;

}

public String readtime(String file) {

String str="/root/Desktop/info.txt";

String timelen = "";

String cmd = "timelen "+file;

runCmd(cmd);

timelen=readFile(str,1);

return timelen;

}

public static void main(String args[]) {

MediocreExecJavac me = new MediocreExecJavac();

String infile = "/root/Desktop/a.mp4";

String outfile = "/root/Desktop/1.flv";

String timelen = me.readtime(infile);

System.out.println("timelen is :" + timelen);

if(me.transfer(infile,outfile)) {

System.out.println("the transfer is ok!");

} else {

System.out.println("the transfer is error!");

}

}

}