1.准备

ffmpeg

链接：https://pan.baidu.com/s/1oh_36qFxnLW5Kmdf8F5eTQ
提取码：rsdn
复制这段内容后打开百度网盘手机App，操作更方便哦

准备3个视频

test.txt

file '20190516150254.mp4'
file '20190516151754.mp4'
file '20190516153254.mp4'

2.代码

package com.qihui.qxj.services.system;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.junit.Test;

public class Test1 {
	
	/**
	 * 把多个视频合成一个视频
	 */
	@Test
	public void test4(){
		try {
			List commend = new ArrayList();
			commend.add("c:/bin/ffmpeg.exe");
			commend.add("-loglevel");
			commend.add("8");
			commend.add("-y");
			commend.add("-f");
			commend.add("concat");
			commend.add("-safe");
			commend.add("0");
			commend.add("-i");
			commend.add("D:/project/direct/40/test.txt");
			commend.add("-c");
			commend.add("copy");
			commend.add("-y");
			commend.add("d:/out.mp4");
			start(commend);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private void start(List commend) {
		Process p = null;
		try {
			ProcessBuilder builder = new ProcessBuilder(commend);
			builder.command(commend);
			p = builder.start();
			p.getOutputStream().close();
			doWaitFor(p);
			p.destroy();
		} catch (Exception e) {
			PrintCatchErrorMsg.Print(e, "Part", "getRSTPPicture.catch", "Exception");
			p.destroy();
		}
	}
	
   
   public static int doWaitFor(Process p) {
	      InputStream in = null;
	      InputStream err = null;
	      int exitValue = -1;

	      try {
	         in = p.getInputStream();
	         err = p.getErrorStream();
	         boolean finished = false;

	         while(!finished) {
	            try {
	               Character c;
	               while(in.available() > 0) {
	                  c = new Character((char)in.read());
	                  System.out.print(c);
	               }

	               while(err.available() > 0) {
	                  c = new Character((char)err.read());
	                  System.out.print(c);
	               }

	               exitValue = p.exitValue();
	               finished = true;
	            } catch (IllegalThreadStateException var19) {
	               Thread.currentThread();
	               Thread.sleep(500L);
	            }
	         }
	      } catch (Exception var20) {
	      } finally {
	         try {
	            if (in != null) {
	               in.close();
	            }
	         } catch (IOException var18) {
	         }

	         if (err != null) {
	            try {
	               err.close();
	            } catch (IOException var17) {
	            }
	         }

	      }

	      return exitValue;
	   }
}

c:/bin/ffmpeg.exe 是ffmepg的安装地址