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.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:ffmpegbinffmpeg.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:ffmpegbinffmpeg.exe');try {ffmpeg.convertor('C:a.avi', 'C:bgm.mp3', 7.1, 'C:javaNew.mp4');} catch (Exception e) {e.printStackTrace();}}}

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