Java 使用 FFmpeg 处理视频文件示例代码详解

package cn.bridgeli.demo;

import org.junit.Test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * @author BridgeLi
 * @date 2020/2/29 15:40
 */
public class FfmpegTest {

 private static final String OS = System.getProperty("os.name").toLowerCase();
 private static final String FFMPEG_PATH = "/Users/bridgeli/ffmpeg-20200216-8578433-macos64-static/bin/ffmpeg";

 @Test
 public void testFfmpeg() {

 String inputWavFile = "/Users/bridgeli/inputWavFile.wav";
 String inputMp3File = "/Users/bridgeli/inputMp3File.mp3";
 String inputMp4File = "/Users/bridgeli/inputMp4File.mp4";
 String outMergeMp3File = "/Users/bridgeli/outMergeMp3File.mp3";
 String outMergeMp3AndMp4File = "/Users/bridgeli/outMergeMp3AndMp4File.mp4";
 String outConcatMp3File = "/Users/bridgeli/outConcatMp3File.mp3";

 // 拼接
 String command = null;
 if (OS.contains("mac") || OS.contains("linux")) {
 command = FFMPEG_PATH + " -i " + inputMp3File + " -i " + inputWavFile + " -filter_complex [0:0][1:0]concat=n=2:v=0:a=1[a] -map [a] " + outConcatMp3File;
 } else if (OS.contains("windows")) {
 command = FFMPEG_PATH + " -i " + inputMp3File + " -i " + inputWavFile + " -filter_complex \"[0:0][1:0]concat=n=2:v=0:a=1[a]\" -map \"[a]\" " + outConcatMp3File;
 }
 // 合并（视频和音频）
// String command = FFMPEG_PATH + " -i " + inputMp4File + " -i " + outConcatMp3File + " -c:v copy -c:a aac -strict experimental " + outMergeMp3AndMp4File;
 // 合并
// String command = FFMPEG_PATH + " -i " + inputMp3File + " -i " + inputWavFile + " -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 " + outMergeMp3File;
 System.out.println(command);

 Process process = null;
 try {
 process = Runtime.getRuntime().exec(command);
 } catch (IOException e) {
 e.printStackTrace();
 }

 if (null == process) {
 return;
 }

 try {
 process.waitFor();
 } catch (InterruptedException e) {
 e.printStackTrace();
 }

 try (InputStream errorStream = process.getErrorStream();
 InputStreamReader inputStreamReader = new InputStreamReader(errorStream);
 BufferedReader br = new BufferedReader(inputStreamReader)) {

 String line = null;
 StringBuffer context = new StringBuffer();
 while ((line = br.readLine()) != null) {
 context.append(line);
 }

 System.out.println("error message: " + context);
 } catch (IOException e) {
 e.printStackTrace();
 }

 process.destroy();
 }
}