Java調用ffmpeg進行視頻轉碼

    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對象，並實例化爲fr
                BufferedReader br=new BufferedReader(file);//建立BufferedReader對象，並實例化爲br
                String Line=br.readLine();//從文件讀取一行字符串
                dataStr=Line;
                br.close();//關閉BufferedReader對象
            } 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!");
            }
        }
    }