java使用ffmpeg处理视频的方法

FFmpeg是一套可以用来记录、转换数字音频、视频，并能将其转化为流的开源计算机程序。采用LGPL或GPL许可证。它提供了录制、转换以及流化音视频的完整解决方案。

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.avi
List<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.avi
List<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();
}
}
}

来源：https://blog.csdn.net/xlikec/article/details/84553260