官网链接http://ffmpeg.org/  

1.下载并解压windows版本安装包

2.windows本地使用命令行测试

1. 修改格式测试（转码）
   1. 将需要修改的视频A.avi 提前放在bin目录下
   2. 在bin目录下cmd进入命令行
   3. 输入命令完成转码成B.mp4

      ffmpeg.exe -i A.avi -y B.mp4

       

2. 视频音频结合测试
   1. 将需要修改的视频A.avi和bgm.mp3 提前放在bin目录下
   2. 在bin目录下cmd进入命令行
   3. 输入命令完成合并成8秒的new.avi

      ffmpeg.exe -i A.avi -i bgm.mp3 -t 8 -y new.avi

       

 

 

3.java中建立工具测试类

package com.xc.utils;import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;public class FFMpegTest {private String ffmpegEXE;public FFMpegTest(String ffmpegEXE) {super();this.ffmpegEXE = ffmpegEXE;}public void convertor(String videoInputPath, String videoOutputPath) throws Exception {
//		ffmpeg -i input.mp4 -y output.aviList<String> command = new ArrayList<>();command.add(ffmpegEXE);command.add("-i");command.add(videoInputPath);command.add("-y");command.add(videoOutputPath);for (String c : command) {System.out.print(c + " ");}ProcessBuilder builder = new ProcessBuilder(command);Process process = builder.start();InputStream errorStream = process.getErrorStream();InputStreamReader inputStreamReader = new InputStreamReader(errorStream);BufferedReader br = new BufferedReader(inputStreamReader);String line = "";while ( (line = br.readLine()) != null ) {}if (br != null) {br.close();}if (inputStreamReader != null) {inputStreamReader.close();}if (errorStream != null) {errorStream.close();}}public static void main(String[] args) {FFMpegTest ffmpeg = new FFMpegTest("C:\\ffmpeg\\bin\\ffmpeg.exe");try {ffmpeg.convertor("C:\\a.mp4", "C:\\b.avi");} catch (Exception e) {e.printStackTrace();}}}

 

package com.xc.utils;import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;public class MergeVideoMp3 {private String ffmpegEXE;public MergeVideoMp3(String ffmpegEXE) {super();this.ffmpegEXE = ffmpegEXE;}public void convertor(String videoInputPath, String mp3InputPath,double seconds, String videoOutputPath) throws Exception {
//		ffmpeg.exe -i A.avi -i bgm.mp3 -t 7 -y new.aviList<String> command = new ArrayList<>();command.add(ffmpegEXE);command.add("-i");command.add(videoInputPath);command.add("-i");command.add(mp3InputPath);command.add("-t");command.add(String.valueOf(seconds));command.add("-y");command.add(videoOutputPath);//		for (String c : command) {
//			System.out.print(c + " ");
//		}ProcessBuilder builder = new ProcessBuilder(command);Process process = builder.start();InputStream errorStream = process.getErrorStream();InputStreamReader inputStreamReader = new InputStreamReader(errorStream);BufferedReader br = new BufferedReader(inputStreamReader);String line = "";while ( (line = br.readLine()) != null ) {}if (br != null) {br.close();}if (inputStreamReader != null) {inputStreamReader.close();}if (errorStream != null) {errorStream.close();}}public static void main(String[] args) {MergeVideoMp3 ffmpeg = new MergeVideoMp3("C:\\ffmpeg\\bin\\ffmpeg.exe");try {ffmpeg.convertor("C:\\a.avi", "C:\\bgm.mp3", 7.1, "C:\\javaNew.mp4");} catch (Exception e) {e.printStackTrace();}}}