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）

将需要修改的视频A.avi 提前放在bin目录下
在bin目录下cmd进入命令行
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

将需要修改的视频A.avi和bgm.mp3 提前放在bin目录下
在bin目录下cmd进入命令行
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();
		}
	}
}

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