Java呼叫ffmpeg轉換影片格式為flv的範例詳解-java教程-PHP中文網

這篇文章主要介紹了詳解java調用ffmpeg轉換視頻格式為flv的相關資料,希望透過本文能幫助到大家，需要的朋友可以參考下

##詳解java調用ffmpeg轉換影片格式為flv

注意：下面的程式是在Linux下運作的，如果在windows下rmvb轉換成avi會出現問題，想成功需要下載下個drv43260 .dll東西放到C:WindowsSystem32下面

這幾天在寫一個視訊管理系統，遇到一個很大的問題就是如果把不同格式轉換為flv，格式！經過網路上的一番搜索，自己在總結，整理，整理，終於整出來了！實現了影片進行轉換的同時也能夠進行影片截圖和刪除原始檔案的功能！

格式轉換主要原理就是先用java呼叫ffmpeg的exe檔！

但是有些格式是ffmpeg不能處理的例如rmvb，這樣的可以先呼叫mencoder先把格式轉換為avi再進行轉換為flv!

我主要寫3個類別：分別為Conver.java

ConverBegin.Java ConverVideo.java

Conver.java 程式碼如下：

package org.Conver;
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

@SuppressWarnings("serial")
public class Conver extends JFrame{
public static JTextArea OutShowLog;
public Conver() {
 setTitle("FLV转换");
 setSize(500, 400);
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 OutShowLog = new JTextArea();
 JScrollPane OutPane = newJScrollPane(OutShowLog);
 add(OutPane,BorderLayout.CENTER);
 setVisible(true);
}
public static void main(String args[]) {
 new Conver();
 ConverBegin cb = new ConverBegin();
 cb.start();
}
}

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ConverBegin.java 程式碼如下：

package org.Conver;
import java.io.File;
public class ConverBegin extends Thread{
String[] ff;
public void run(){
 while (true) {
 String folderpath ="other/";
 //String path = null;
 File f = newFile(folderpath);
  if (f.isDirectory()) {
 ff = f.list();
 int i =0;
 while (i< ff.length) {
 new ConverVideo(folderpath+ff[i]).beginConver();
 i++;
 }
 Conver.OutShowLog.append("---------------总共转换了"+ff.length+"-----------视频------------");
 ff =null;
 }
  f = null;
 
  try {
 Thread.sleep(10000);
 } catch (InterruptedExceptione) {
 //如果失败重启线程
 this.start();
 }
 }
 

}
}

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#ConverBegin.java 程式碼如下

package org.Conver;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;



public class ConverVideo {
private Date dt;
private long begintime;
private String PATH;
private String filerealname; // 文件名 不包括扩展名
private Stringfilename; // 包括扩展名
private String videofolder = "other/"; //别的格式视频的目录
private String flvfolder ="flv/";  //flv视频的目录
 privateStringffmpegpath="ffmpeg/ffmpeg.exe"; //ffmpeg.exe的目录
 privateStringmencoderpath="ffmpeg/mencoder"; //mencoder的目录
 privateStringvideoRealPath="flv/"; //截图的视频目录;
 privateString imageRealPath ="img/"; //截图的存放目录
 //privateString batrealpath="ffmpeg/ffmpeg.bat"; //bat目录
 publicConverVideo(){}
public ConverVideo(String path) {
 PATH = path;
}
 publicString getPATH() {
 return PATH;
}

public void setPATH(String path) {
 PATH = path;
}
public boolean beginConver(){
 File fi = new File(PATH);
 filename = fi.getName();
 filerealname = filename.substring(0,filename.lastIndexOf("."))
 .toLowerCase();
 Conver.OutShowLog.append("----接收到文件("+PATH+")需要转换--------------------------");
 if (!checkfile(PATH)) {
 Conver.OutShowLog.append(PATH+ "文件不存在"+" ");
 return false;
 }
 dt = new Date();
 begintime = dt.getTime();
 Conver.OutShowLog.append("----开始转文件("+PATH+")--------------------------");
 if (process()) {
 Date dt2 = new Date();
 Conver.OutShowLog.append("转换成功");
 long endtime =dt2.getTime();
 long timecha = (endtime -begintime);
 String totaltime =sumTime(timecha);
 Conver.OutShowLog.append("共用了:" + totaltime+" ");
  if(processImg()) {
  Conver.OutShowLog.append("截图成功了 ");
  }else {
  Conver.OutShowLog.append("截图不成功了 ");
 }
  PATH = null;
  return true;
 }else {
  PATH = null;
 return false;
 }
}
public boolean processImg() {
//  System.out.println(newfilename + "->" +newimg);
  List commend = new java.util.ArrayList();
  commend.add(ffmpegpath);
  commend.add("-i");
  commend.add(videoRealPath+filerealname+".flv");
  commend.add("-y");
  commend.add("-f");
  commend.add("image2");
  commend.add("-ss");
  commend.add("38");
  commend.add("-t");
  commend.add("0.001");
  commend.add("-s");
  commend.add("320x240");
  commend.add(imageRealPath+filerealname+".jpg");
 try {
  ProcessBuilder builder = new ProcessBuilder();
  builder.command(commend);
  builder.start();
  return true;
  } catch (Exception e) {
  e.printStackTrace();
  return false;
  }
 }
private boolean process() {
 int type = checkContentType();
 boolean status = false;
 if (type == 0) {

 // status =processFLV(PATH);// 直接将文件转为flv文件
 status =processFLV(PATH);
 } else if (type == 1) {
 String avifilepath =processAVI(type);
 if (avifilepath == null)
 returnfalse;
 // avi文件没有得到
 else {
 System.out.println("kaishizhuang");
 status =processFLV(avifilepath);// 将avi转为flv
 }
 }
 return status;
}

private int checkContentType() {
 String type =PATH.substring(PATH.lastIndexOf(".") + 1, PATH.length())
 .toLowerCase();
 //ffmpeg能解析的格式：（asx，asf，mpg，wmv，3gp，mp4，mov，avi，flv等）
 if (type.equals("avi")) {
 return 0;
 } else if (type.equals("mpg")) {
 return 0;
 } else if (type.equals("wmv")) {
 return 0;
 } else if (type.equals("3gp")) {
 return 0;
 } else if (type.equals("mov")) {
 return 0;
 } else if (type.equals("mp4")) {
 return 0;
 } else if (type.equals("asf")) {
 return 0;
 } else if (type.equals("asx")) {
 return 0;
 } else if (type.equals("flv")) {
 return 0;
 }
 // 对ffmpeg无法解析的文件格式(wmv9，rm，rmvb等),
 // 可以先用别的工具（mencoder）转换为avi(ffmpeg能解析的)格式.
 else if (type.equals("wmv9")) {
 return 1;
 } else if (type.equals("rm")) {
 return 1;
 } else if (type.equals("rmvb")) {
 return 1;
 }
 return 9;
}

private boolean checkfile(String path) {
 File file = new File(path);
 if (!file.isFile()) {
 return false;
 }else {
 return true;
 }
}

// 对ffmpeg无法解析的文件格式(wmv9，rm，rmvb等),可以先用别的工具（mencoder）转换为avi(ffmpeg能解析的)格式.
private String processAVI(int type) {
 List commend = new java.util.ArrayList();
 
 commend.add(mencoderpath);
 commend.add(PATH);
 commend.add("-oac");
 commend.add("mp3lame");
 commend.add("-lameopts");
 commend.add("preset=64");
 commend.add("-ovc");
 commend.add("xvid");
 commend.add("-xvidencopts");
 commend.add("bitrate=600");
 commend.add("-of");
 commend.add("avi");
 commend.add("-o");
 commend.add(videofolder + filerealname +".avi");
 // 命令类型：mencoder 1.rmvb -oac mp3lame -lameoptspreset=64 -ovc xvid
 // -xvidencopts bitrate=600 -of avi -ormvb.avi
 try {
 ProcessBuilder builder = newProcessBuilder();
 builder.command(commend);
 Process p =builder.start();

 doWaitFor(p);
 return videofolder +filerealname + ".avi";
 } catch (Exception e) {
 e.printStackTrace();
 return null;
 }
}

// ffmpeg能解析的格式：（asx，asf，mpg，wmv，3gp，mp4，mov，avi，flv等）
private boolean processFLV(String oldfilepath) {

 if (!checkfile(PATH)) {
 System.out.println(oldfilepath+ " is not file");
 return false;
 }

 List commend = new java.util.ArrayList();
 commend.add(ffmpegpath);
 commend.add("-i");
 commend.add(oldfilepath);
 commend.add("-ab");
 commend.add("64");
 commend.add("-acodec");
 commend.add("mp3");
 commend.add("-ac");
 commend.add("2");
 commend.add("-ar");
 commend.add("22050");
 commend.add("-b");
 commend.add("230");
 commend.add("-r");
 commend.add("24");
 commend.add("-y");
 commend.add(flvfolder + filerealname +".flv");
 try {
 ProcessBuilder builder = newProcessBuilder();
 String cmd =commend.toString();
 builder.command(commend);
 //builder.redirectErrorStream(true);
 Process p =builder.start();
 doWaitFor(p);
 p.destroy();
 deleteFile(oldfilepath);
 return true;
 } catch (Exception e) {
 e.printStackTrace();
 return false;
 }
}

public int doWaitFor(Process p)

{
 InputStream in = null;
 InputStream err=null;
 int exitValue = -1; // returned to caller when pis finished
 try {
 System.out.println("comeing");
 in = p.getInputStream();
 err =p.getErrorStream();
 boolean finished = false; //Set to true when p is finished

 while (!finished) {
 try {
 while (in.available() > 0) {
  // Print the output of our system call
  Character c = new Character((char) in.read());
  System.out.print(c);
 }
 while (err.available() > 0) {
  // Print the output of our system call
  Character c = new Character((char) err.read());
  System.out.print(c);
 }

 // Ask the process for its exitValue. If the process
 // is not finished, an IllegalThreadStateException
 // is thrown. If it is finished, we fall through and
 // the variable finished is set to true.
 exitValue = p.exitValue();
 finished = true;

 } catch(IllegalThreadStateException e) {
 // Process is not finished yet;
 // Sleep a little to save on CPU cycles
 Thread.currentThread().sleep(500);
 }
 }
 } catch (Exception e) {
 // unexpected exception! printit out for debugging...
 System.err.println("doWaitFor();: unexpected exception - "
 + e.getMessage());
 } finally {
 try {
 if(in!=null)
 {
 in.close();
 }
 
 } catch (IOException e){
 System.out.println(e.getMessage());
 }
 if(err!=null)
 {
 try {
 err.close();
 } catch(IOException e) {
 System.out.println(e.getMessage());
 }
 }
 }
 // return completion status to caller
 return exitValue;
}

public void deleteFile(String filepath) {
 File file = new File(filepath);
 if (PATH.equals(filepath)) {
 if (file.delete()) {
 System.out.println("文件" + filepath + "已删除");
 }
 } else {
 if (file.delete()) {
 System.out.println("文件" + filepath + "已删除 ");
 }
 File filedelete2 = newFile(PATH);
 if (filedelete2.delete()){
 System.out.println("文件" + PATH + "已删除");
 }
 }
}

public String sumTime(long ms) {
 int ss = 1000;
 long mi = ss * 60;
 long hh = mi * 60;
 long dd = hh * 24;

 long day = ms / dd;
 long hour = (ms - day * dd) / hh;
 long minute = (ms - day * dd - hour * hh) /mi;
 long second = (ms - day * dd - hour * hh -minute * mi) / ss;
 long milliSecond = ms - day * dd - hour * hh -minute * mi - second
 * ss;

 String strDay = day < 10 ? "0" +day + "天" : "" + day + "天";
 String strHour = hour < 10 ? "0"+ hour + "小时" : "" + hour + "小时";
 String strMinute = minute < 10 ?"0" + minute + "分" : "" + minute + "分";
 String strSecond = second < 10 ?"0" + second + "秒" : "" + second + "秒";
 String strMilliSecond = milliSecond< 10 ? "0" + milliSecond : ""
 +milliSecond;
 strMilliSecond = milliSecond <100 ? "0" + strMilliSecond + "毫秒" : ""
 +strMilliSecond + " 毫秒";
 return strDay + " " + strHour + ":" + strMinute+ ":" + strSecond + " "
 +strMilliSecond;

}
}

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