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; }