JavaCV使用ffmpeg实现录屏功能
作者：qq_492448446
这篇文章主要介绍了JavaCV如何使用ffmpeg实现录屏功能,本文通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
今天突发奇想，想自己写一个录屏的软件，上次写了一个专门录音的Demo，但是要把声音和视频放到一起合成一个mp4文件，着实有一点艰难，所以就打算使用ffmpeg来写一个，而这篇博客中会顺便谈一谈我碰到的各种坑。
ffmpeg是一个c++程序，要想在java中使用ffmpeg，无非就是两种方式：直接在java程序中调用ffmpeg.exe，还有就是通过jni的方式。而在这里我就是使用jni的方式，但是我在这里直接使用javacv这个框架来实现就可以，用这个的好处就是你什么都不要干，直接导入几个重要的jar包就可以。
步骤
首先呢，下载javacv就可以
你也可以直接在我这里下载
然后下载好了，就要开始导包了，导入javacpp，javacv-platform，javacv，这三个一定要导，另外要能使用ffmpeg的API实现录屏就要再导入ffmpeg和videoinput。
导完包之后代码测试一下，这里发一个别人写的代码，可以实现录屏，但不能录音，代码里面需要修改一下存放文件的路径：
实现代码
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;
/**
* 使用javacv进行录屏
*
*/
public class VideoRecord {
//线程池 screenTimer
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
private ScheduledThreadPoolExecutor exec;
private TargetDataLine line;
private AudioFormat audioFormat;
private DataLine.Info dataLineInfo;
private boolean isHaveDevice = true;
private long startTime = 0;
private long videoTS = 0;
private long pauseTime = 0;
private double frameRate = 5;
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_FLV1); // 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 Auto-generated catch block
System.out.print("*******************************");
}
this.isHaveDevice = isHaveDevice;
}
/**
* 开始录制
*/
public void start() {
if (startTime == 0) {
startTime = System.currentTimeMillis();
}
if (pauseTime == 0) {
pauseTime = System.currentTimeMillis();
}
// 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
caputre();
}
}).start();
}
// 录屏
screenTimer = new ScheduledThreadPoolExecutor(1);
screenTimer.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
// 将screenshot对象写入图像文件
// try {
// ImageIO.write(screenCapture, "JPEG", f);
// videoGraphics.drawImage(screenCapture, 0, 0, null);
// IplImage image = cvLoadImage(name); // 非常吃内存！！
// // 创建一个 timestamp用来写入帧中
// videoTS = 1000
// * (System.currentTimeMillis() - startTime - (System.currentTimeMillis() -
// pauseTime));
// // 检查偏移量
// if (videoTS > recorder.getTimestamp()) {
// recorder.setTimestamp(videoTS);
// }
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 {
videoTS = 1000L
* (System.currentTimeMillis() - startTime - (System.currentTimeMillis() - 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);
}
/**
* 抓取声音
*/
public void caputre() {
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("#################");
}
try {
line.open(audioFormat);
} catch (LineUnavailableException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
line.start();
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);
}
/**
* 停止
*/
public void stop() {
if (null != screenTimer) {
screenTimer.shutdownNow();
}
try {
recorder.stop();
recorder.release();
recorder.close();
screenTimer = null;
// screenCapture = null;
if (isHaveDevice) {
if (null != exec) {
exec.shutdownNow();
}
if (null != line) {
line.stop();
line.close();
}
dataLineInfo = null;
audioFormat = null;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 暂停
*
* @throws Exception
*/
public void pause() throws Exception {
screenTimer.shutdownNow();
screenTimer = null;
if (isHaveDevice) {
exec.shutdownNow();
exec = null;
line.stop();
line.close();
dataLineInfo = null;
audioFormat = null;
line = null;
}
pauseTime = System.currentTimeMillis();
}
public static void main(String[] args) throws Exception, AWTException {
VideoRecord videoRecord = new VideoRecord("C:\\Users\\Administrator\\Desktop\\视频", false);
videoRecord.start();
while (true) {
System.out.println("你要停止吗？请输入(stop)，程序会停止。");
Scanner sc = new Scanner(System.in);
if (sc.next().equalsIgnoreCase("stop")) {
videoRecord.stop();
System.out.println("停止");
}
if (sc.next().equalsIgnoreCase("pause")) {
videoRecord.pause();
System.out.println("暂停");
}
if (sc.next().equalsIgnoreCase("start")) {
videoRecord.start();
System.out.println("开始");
}
}
}
}
class Constant{
public final static int WIDTH=Toolkit.getDefaultToolkit().getScreenSize().width;
public final static int HEIGHT=Toolkit.getDefaultToolkit().getScreenSize().height;
}到此这篇关于JavaCV使用ffmpeg实现录屏功能的文章就介绍到这了,更多相关JavaCV ffmpeg录屏内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！