Java调用linux命令ffmpeg视频转码

import java.io.*;

import java.lang.*;

import java.util.*;

import java.text.*;

import java.net.*;

public class MediocreExecJavac

{

//运行命令

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;

System.out.println("<ERROR>");

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

System.out.println(line);

System.out.println("</ERROR>");

int exitVal = proc.waitFor();

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

} catch (Throwable t)

{

t.printStackTrace();

}

}



//视频转码，infile输入文件(包括完整路径)，outfile输出文件

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;

//avi -> jpg

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;

System.out.println("<ERROR>");

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

System.out.println(line);

System.out.println("</ERROR>");

int exitVal = proc.waitFor();

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

} catch (Throwable t)

{

t.printStackTrace();

return false;

}

return true;

}



//读取文件,fileName输入文件，id行数

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

int i=1;

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

//System.out.println("Line1="+Line+"="+Line);

//判断读取到的字符串是否不为空

//while(Line!=null){

//System.out.println(Line + "<br>");//输出从文件中读取的数据

//if(i==line){dataStr=Line;break;}else{i=i+1;}

//Line=br.readLine();//从文件中继续读取一行数据

//}

dataStr=Line;

br.close();//关闭BufferedReader对象

}

catch(Exception e){

}finally{

try

{

if(fis!=null)

fis.close();

}catch(Exception e){}

}

return dataStr;

}

//读时长信息

public String readtime(String file)

{

String str="/opt/cgogo/test/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 = "/opt/cgogo/test/02.avi";

String outfile = "01.flv";

//时长

String timelen = me.readtime(infile);

System.out.println("02.avi timelen is :" + timelen);

//转码

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

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

}else{

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

}

}

}