FFmpeg是一套可以用來記錄、轉換數字音訊、視訊，並能將其轉化為流的開源計算機程式。採用LGPL或GPL許可證。它提供了錄製、轉換以及流化音視訊的完整解決方案。

官網連結http://ffmpeg.org/

1.下載並解壓windows版本安裝包

2.windows本地使用命令列測試

1.修改格式測試（轉碼）

1. 將需要修改的視訊A.avi 提前放在bin目錄下
2. 在bin目錄下cmd進入命令列
3. 輸入命令完成轉碼成B.mp4

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

2.視訊音訊結合測試

1. 將需要修改的視訊A.avi和bgm.mp3 提前放在bin目錄下
2. 在bin目錄下cmd進入命令列
3. 輸入命令完成合併成8秒的new.avi

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

3.java中建立工具測試類

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();
		}
	}
}

總結

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