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用java小例題說明更直觀:(可以直接編譯運行)
環境我在windows平臺下測試的。。。
需要在e:/下有ffmpeg.exe;mencoder.exe;drv43260.dll;pncrt.dll共4個文件。
如何得到這4個文件參考文章http://blog.sina.com.cn/u/4a424eca010005kb
還要在e:/input下放各種文件名為a的以下各種視頻文件;還要e:/output;java程序執行后能得到一個a.flv的已轉換的文件。
ffmpeg.exe能解析的格式:(asx,asf,mpg,wmv,3gp,mp4,mov,avi,flv等)
對ffmpeg.exe無法解析的文件格式(wmv9,rm,rmvb等),
可以先用別的工具(mencoder)轉換為avi(ffmpeg能解析的)格式;
mencoder.exe;drv43260.dll;pncrt.dll這3個文件是為文件格式(wmv9,rm,rmvb等)
轉換為avi(ffmpeg能解析的)格式準備的;再把轉換好的avi文件再用ffmpeg.exe轉換成flv格式的視頻文件。。。
package com.jh.test;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class ConvertVideo {
private static String inputPath = "";
private static String outputPath = "";
private static String ffmpegPath = "";
public static void main(String args[]) throws IOException {
getPath();
if (!checkfile(inputPath)) {
System.out.println(inputPath + " is not file");
return;
}
if (process()) {
System.out.println("ok");
}
}
public static void getPath(){
// 先獲取當前項目路徑,在獲得源文件、目標文件、轉換器的路徑
File diretory = new File("");
try {
String currPath = diretory.getAbsolutePath();
//視頻的地址
inputPath = "C:\\平行四邊形面積.flv";
//視頻轉完格式存放地址
outputPath = "E:\\mp4\\";
//轉換視頻的插件位置
ffmpegPath = "G:\\工具類\\ffmpeg-20171225-be2da4c-win64-static\\ffmpeg-20171225-be2da4c-win64-static\\bin\\";
System.out.println(currPath);
}
catch (Exception e) {
System.out.println("getPath出錯");
}
}
public static boolean process() {
int type = checkContentType();
boolean status = false;
System.out.println("直接轉成mp4格式");
status = processMp4(inputPath);// 直接轉成mp4格式
return status;
}
private static int checkContentType() {
String type = inputPath.substring(inputPath.lastIndexOf(".") + 1, inputPath.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;
}
// 對ffmpeg無法解析的文件格式(wmv9,rm,rmvb等),
// 可以先用別的工具(mencoder)轉換為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 static boolean checkfile(String path) {
File file = new File(path);
if (!file.isFile()) {
return false;
}
return true;
}
// 對ffmpeg無法解析的文件格式(wmv9,rm,rmvb等), 可以先用別的工具(mencoder)轉換為avi(ffmpeg能解析的)格式.
private static String processAVI(int type) {
List<String> commend = new ArrayList<String>();
commend.add(ffmpegPath + "mencoder");
commend.add(inputPath);
commend.add("-oac");
commend.add("lavc");
commend.add("-lavcopts");
commend.add("acodec=mp3:abitrate=64");
commend.add("-ovc");
commend.add("xvid");
commend.add("-xvidencopts");
commend.add("bitrate=600");
commend.add("-of");
commend.add("mp4");
commend.add("-o");
commend.add(outputPath + "a.AVI");
try {
ProcessBuilder builder = new ProcessBuilder();
Process process = builder.command(commend).redirectErrorStream(true).start();
new PrintStream(process.getInputStream());
new PrintStream(process.getErrorStream());
process.waitFor();
return outputPath + "a.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 static boolean processFlv(String oldfilepath) {
if (!checkfile(inputPath)) {
System.out.println(oldfilepath + " is not file");
return false;
}
List<String> command = new ArrayList<String>();
command.add(ffmpegPath + "ffmpeg");
command.add("-i");
command.add(oldfilepath);
command.add("-ab");
command.add("56");
command.add("-ar");
command.add("22050");
command.add("-qscale");
command.add("8");
command.add("-r");
command.add("15");
command.add("-s");
command.add("600x500");
command.add(outputPath + "a.flv");
try {
// 方案1
// Process videoProcess = Runtime.getRuntime().exec(ffmpegPath + "ffmpeg -i " + oldfilepath
// + " -ab 56 -ar 22050 -qscale 8 -r 15 -s 600x500 "
// + outputPath + "a.flv");
// 方案2
Process videoProcess = new ProcessBuilder(command).redirectErrorStream(true).start();
new PrintStream(videoProcess.getErrorStream()).start();
new PrintStream(videoProcess.getInputStream()).start();
videoProcess.waitFor();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
private static boolean processMp4(String oldfilepath) {
if (!checkfile(inputPath)) {
System.out.println(oldfilepath + " is not file");
return false;
}
List<String> command = new ArrayList<String>();
command.add(ffmpegPath + "ffmpeg");
command.add("-i");
command.add(oldfilepath);
command.add("-c:v");
command.add("libx264");
command.add("-mbd");
command.add("0");
command.add("-c:a");
command.add("aac");
command.add("-strict");
command.add("-2");
command.add("-pix_fmt");
command.add("yuv420p");
command.add("-movflags");
command.add("faststart");
command.add(outputPath + "a.mp4");
try {
// 方案1
// Process videoProcess = Runtime.getRuntime().exec(ffmpegPath + "ffmpeg -i " + oldfilepath
// + " -ab 56 -ar 22050 -qscale 8 -r 15 -s 600x500 "
// + outputPath + "a.flv");
// 方案2
Process videoProcess = new ProcessBuilder(command).redirectErrorStream(true).start();
new PrintStream(videoProcess.getErrorStream()).start();
new PrintStream(videoProcess.getInputStream()).start();
videoProcess.waitFor();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
}
class PrintStream extends Thread
{
java.io.InputStream is = null;
public PrintStream(java.io.InputStream is)
{
is = is;
}
public void run()
{
try
{
while(this != null)
{
int _ch = __is.read();
if(_ch != -1)
System.out.print((char)_ch);
else break;
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
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