javacv利用ffmpeg实现录屏和录音，输出为mp4文件

前言
不知道怎么使用配置javacv的看上一篇文章----使用javacv中的ffmpeg实现录屏，结果连运行都失败了，现在终于解决了
这篇博客是上篇博客代码的改进，因为上篇博客的代码有很多bug。

思路
开启两个周期都为1帧时长的线程，通过Robot类进行抓屏，Sound API进行抓取音频，然后使用ffmpeg记录到mp4文件中。

代码实现：

package com;

import java.awt.AWTException;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ShortBuffer;
import java.util.Scanner;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.TargetDataLine;

import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.ffmpeg.global.avutil;
import org.bytedeco.javacv.FFmpegFrameRecorder;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.FrameRecorder.Exception;
import org.bytedeco.javacv.Java2DFrameConverter;

public class VideoRecord {
	//线程池 screenTimer,录制视频
	private ScheduledThreadPoolExecutor screenTimer;
	//获取屏幕尺寸
	private final Rectangle rectangle = new Rectangle(Constant.WIDTH, Constant.HEIGHT); // 截屏的大小
	//视频类 FFmpegFrameRecorder
	private FFmpegFrameRecorder recorder;
	private Robot robot;
	
	//线程池 exec，录制音频
	private ScheduledThreadPoolExecutor exec;
	private TargetDataLine line;
	private AudioFormat audioFormat;
	private DataLine.Info dataLineInfo;
	///是否开启录音设备
	private boolean isHaveDevice = true;
	private long startTime = 0;
	private long videoTS = 0;
	private long pauseTimeStart = 0;//开始暂停的时间
	private long pauseTime = 0;//暂停的时长
	private double frameRate = 5;
	
	private String state="start";//录制状态：start正在录制，pause暂停录制，stop停止录制
	public String getState() {
		return state;
	}
	
	
	public VideoRecord(String fileName, boolean isHaveDevice) {
		// TODO Auto-generated constructor stub
		recorder = new FFmpegFrameRecorder(fileName + ".mp4", Constant.WIDTH, Constant.HEIGHT);
//		 recorder.setVideoCodec(avcodec.AV_CODEC_ID_H265); // 28
		recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4); // 13
		recorder.setFormat("mp4");
		// recorder.setFormat("mov,mp4,m4a,3gp,3g2,mj2,h264,ogg,MPEG4");
		recorder.setSampleRate(44100);
		recorder.setFrameRate(frameRate);
		recorder.setVideoQuality(0);
		recorder.setVideoOption("crf", "23");
		// 2000 kb/s, 720P视频的合理比特率范围
		recorder.setVideoBitrate(1000000);
		/**
		 * 权衡quality(视频质量)和encode speed(编码速度) values(值)： ultrafast(终极快),superfast(超级快),
		 * veryfast(非常快), faster(很快), fast(快), medium(中等), slow(慢), slower(很慢),
		 * veryslow(非常慢)
		 * ultrafast(终极快)提供最少的压缩（低编码器CPU）和最大的视频流大小；而veryslow(非常慢)提供最佳的压缩（高编码器CPU）的同时降低视频流的大小
		 * 参考：https://trac.ffmpeg.org/wiki/Encode/H.264 官方原文参考：-preset ultrafast as the
		 * name implies provides for the fastest possible encoding. If some tradeoff
		 * between quality and encode speed, go for the speed. This might be needed if
		 * you are going to be transcoding multiple streams on one machine.
		 */
		recorder.setVideoOption("preset", "slow");
		recorder.setPixelFormat(avutil.AV_PIX_FMT_YUV420P); // yuv420p
		recorder.setAudioChannels(2);
		recorder.setAudioOption("crf", "0");
		// Highest quality
		recorder.setAudioQuality(0);
		recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);
		try {
			robot = new Robot();
		} catch (AWTException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			recorder.start();
		} catch (Exception e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		
		if(isHaveDevice) {
			/**
			 * float sampleRate：采样率；每秒采样数 ；
			 * int sampleSizeInBits：采样位数；每个样本中的位数 ；
			 * int channels：音频通道数，1为mono，2为立体声；
			 * boolean signed；
			 * boolean bigEndian：是否为大端存储；指示单个样本的数据是否以大字节顺序存储
			 */
			audioFormat = new AudioFormat(44100.0F, 16, 2, true, false);
			dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
			try {
				line = (TargetDataLine) AudioSystem.getLine(dataLineInfo);
			} catch (LineUnavailableException e1) {
				// TODO Auto-generated catch block
				System.out.println("未获得音频线路，"+e1);
			}
		}
		this.isHaveDevice = isHaveDevice;
	}
	
	
	/**
	 * 开始录制
	 */
	public void start() {
		state="start";
		if (startTime == 0) {
			startTime = System.currentTimeMillis();
		}
		if(pauseTimeStart!=0) {
			//计算暂停的时长
			pauseTime=System.currentTimeMillis()-pauseTimeStart;
			pauseTimeStart=0;//归零
		}
		else {
			//没有暂停过，暂停时长为0
			pauseTime=0;
		}
		
		// 如果有录音设备则启动录音线程
		if (isHaveDevice) {
			new Thread(new Runnable() {
				@Override
				public void run() {
					// TODO Auto-generated method stub
					SoundCaputre();
				}
			}).start();

		}
		
		//录屏
		screenCaptrue();
	}
	
	//开启录屏的线程
	private void screenCaptrue() {
		// 录屏
		screenTimer = new ScheduledThreadPoolExecutor(1);
		/***
		 * 参数：
		 * 	command - 要执行的任务 
			initialDelay - 延迟第一次执行的时间 ，延迟一帧的时间，我们设置的mp4的帧速为frameRate=每秒5帧，所以一帧的时间为 1秒/5
			period - 连续执行之间的时期 ，执行周期，为1帧的时间
			unit - initialDelay和period参数的时间单位，TimeUnit.MILLISECONDS为千分之一秒，就是1毫秒
		 */
		screenTimer.scheduleAtFixedRate(new Runnable() {
			@Override
			public void run() {
				BufferedImage screenCapture = robot.createScreenCapture(rectangle); // 截屏
				
				BufferedImage videoImg = new BufferedImage(Constant.WIDTH, Constant.HEIGHT,
						BufferedImage.TYPE_3BYTE_BGR); // 声明一个BufferedImage用重绘截图
				
				Graphics2D videoGraphics = videoImg.createGraphics();// 创建videoImg的Graphics2D
				
				videoGraphics.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_DISABLE);
				videoGraphics.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING,
						RenderingHints.VALUE_COLOR_RENDER_SPEED);
				videoGraphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
				videoGraphics.drawImage(screenCapture, 0, 0, null); // 重绘截图
				
				Java2DFrameConverter java2dConverter = new Java2DFrameConverter();
				
				Frame frame = java2dConverter.convert(videoImg);
				try {
					//计算总时长
					videoTS = 1000L*(System.currentTimeMillis()-startTime-pauseTime);
					
					// 检查偏移量
					if (videoTS > recorder.getTimestamp()) {
						recorder.setTimestamp(videoTS);
					}
					recorder.record(frame); // 录制视频
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				// 释放资源
				videoGraphics.dispose();
				videoGraphics = null;
				videoImg.flush();
				videoImg = null;
				java2dConverter = null;
				screenCapture.flush();
				screenCapture = null;
			}
				
		}, (int) (1000 / frameRate), (int) (1000 / frameRate), TimeUnit.MILLISECONDS);
	}
	
	/**
	 * 开启抓取声音的线程
	 */
	public void SoundCaputre() {	
		
		try {
			if(!line.isRunning()){
				line.open(audioFormat);
				line.start();
			}
		} catch (LineUnavailableException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		

		final int sampleRate = (int) audioFormat.getSampleRate();
		final int numChannels = audioFormat.getChannels();

		int audioBufferSize = sampleRate * numChannels;
		final byte[] audioBytes = new byte[audioBufferSize];

		exec = new ScheduledThreadPoolExecutor(1);
		exec.scheduleAtFixedRate(new Runnable() {
			@Override
			public void run() {
				try {
					int nBytesRead = line.read(audioBytes, 0, line.available());
					int nSamplesRead = nBytesRead / 2;
					short[] samples = new short[nSamplesRead];

					// Let's wrap our short[] into a ShortBuffer and
					// pass it to recordSamples
					ByteBuffer.wrap(audioBytes).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(samples);
					ShortBuffer sBuff = ShortBuffer.wrap(samples, 0, nSamplesRead);

					// recorder is instance of
					// org.bytedeco.javacv.FFmpegFrameRecorder
					recorder.recordSamples(sampleRate, numChannels, sBuff);
					// System.gc();
				} catch (org.bytedeco.javacv.FrameRecorder.Exception e) {
					e.printStackTrace();
				}
			}
		}, (int) (1000 / frameRate), (int) (1000 / frameRate), TimeUnit.MILLISECONDS);
	}
	
	/**
	 * 暂停录制
	 */
	public void pause() {
		state="pause";
		screenTimer.shutdownNow();
		screenTimer = null;
		if (isHaveDevice) {
			exec.shutdownNow();
			exec = null;
		}
		pauseTimeStart = System.currentTimeMillis();
		
	}
	/**
	 * 停止录制
	 */
	public void stop() {
		state="stop";
		if (null != screenTimer) {
			screenTimer.shutdownNow();
		}
		try {
			if (isHaveDevice) {
				if (null != exec) {
					exec.shutdownNow();
				}
				if (null != line) {
					line.stop();
					line.close();
				}
				dataLineInfo = null;
				audioFormat = null;
			}
			recorder.stop();
			recorder.release();
			recorder.close();
			screenTimer = null;
			// screenCapture = null;
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	
	public static void main(String[] args) {
		VideoRecord videoRecord = new VideoRecord("C:\Users\Administrator\Desktop\视频2", true);
		videoRecord.start();
		System.out.println("****start继续录制，pause暂停录制，stop停止录制****");
		while (true) {
			Scanner sc = new Scanner(System.in);
			if(sc.hasNext()) {
				String cmd=sc.next();
				if (cmd.equalsIgnoreCase("stop")) {
					videoRecord.stop();
					System.out.println("****已经停止录制****");
					break;
				}
				if (cmd.equalsIgnoreCase("pause")) {
					if(videoRecord.getState().equals("pause")) {
						System.out.println("*error:已经暂停，请勿重复操作pause*");
						continue;
					}
					videoRecord.pause();
					System.out.println("****已暂停，start继续录制，stop结束录制****");
				}
				if (cmd.equalsIgnoreCase("start")) {
					if(videoRecord.getState().equals("start")) {
						System.out.println("*error:请勿重复操作start*");
						continue;
					}
					videoRecord.start();
					System.out.println("****正在录制****");
				}
			}
		}
	}
	
}

class Constant{
	public final static int WIDTH=Toolkit.getDefaultToolkit().getScreenSize().width;
	public final static int HEIGHT=Toolkit.getDefaultToolkit().getScreenSize().height;

}

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