java实现一个录像大师
javacv从入门到入土系列，发现了个好玩的东西，视频处理，于是我想搞了个屏幕录屏大师，这里我使用javafx进行页面显示。
依赖
<!-- 需要注意，javacv主要是一组API为主，还需要加入对应的实现 -->
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv</artifactId>
<version>1.5.6</version>
</dependency>
<!-- 用到了 ffmpeg 需要把 ffmpeg 的平台实现依赖引入 -->
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>ffmpeg-platform</artifactId>
<version>4.4-1.5.6</version>
</dependency>
<!--所有平台实现，依赖非常大，几百MB吧-->
<!--<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv-platform</artifactId>
<version>1.5.6</version>
</dependency>-->
实现
package top.lingkang.test.gui;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
import org.bytedeco.ffmpeg.avcodec.AVPacket;
import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.javacv.*;
import javax.sound.sampled.*;
import java.io.File;
import java.util.Timer;
import java.util.TimerTask;
/**
* @author lingkang
* Created by 2022/5/10
*/
public class DesktopRecording extends Application {
private static final int frameRate = 10;// 录制的帧率
private static boolean isStop = false;
private static TargetDataLine line;
private static File audioFile, videoFile;
private static ImageView imageVideo;
private static boolean isStart;
@Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setTitle("lingkang-桌面录屏emm...");
imageVideo = new ImageView();
imageVideo.setFitWidth(800);
imageVideo.setFitHeight(600);
Button button = new Button("停止录制");
button.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
isStop = true;
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.setTitle("info");
alert.setHeaderText("已经停止录制");
alert.setOnCloseRequest(event1 -> alert.hide());
alert.showAndWait();
}
});
VBox box = new VBox();
box.getChildren().addAll(button, imageVideo);
primaryStage.setScene(new Scene(box));
primaryStage.setHeight(600);
primaryStage.setWidth(800);
primaryStage.show();
primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
@Override
public void handle(WindowEvent event) {
isStop = true;
System.exit(0);
}
});
// window 建议使用 FFmpegFrameGrabber("desktop") 进行屏幕捕捉
FrameGrabber grabber = new FFmpegFrameGrabber("desktop");
grabber.setFormat("gdigrab");
grabber.setFrameRate(frameRate);
// 捕获指定区域，不设置则为全屏
grabber.setImageHeight(600);
grabber.setImageWidth(800);
//grabber.setOption("offset_x", "200");
grabber.setOption("offset_y", "200");//必须设置了大小才能指定区域起点，参数可参考 FFmpeg 入参
grabber.start();
videoFile = File.createTempFile("lingkang", ".avi");
// 用于存储视频 , 先调用stop，在释放，就会在指定位置输出文件，，这里我保存到D盘
FFmpegFrameRecorder recorder = FFmpegFrameRecorder.createDefault(videoFile, grabber.getImageWidth(), grabber.getImageHeight());
recorder.setVideoOption("tune", "zerolatency");
recorder.setFrameRate(frameRate);
recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);// 编码，使用编码能让视频占用内存更小，根据实际自行选择
recorder.start();
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
if (isStop) {
try {
// 停止
recorder.stop();
grabber.stop();
// 释放内存，我们都知道c/c++需要手动释放资源
recorder.release();
grabber.release();
} catch (Exception e) {
e.printStackTrace();
}
new Thread(new Runnable() {
@Override
public void run() {
try {
composeVideo();
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
timer.cancel();
return;
}
if (!isStart) {
isStart = true;
// 录制声音
startAudio();
}
try {
// 获取屏幕捕捉的一帧
Frame frame = grabber.grabFrame();
// 将这帧放到记录
recorder.record(frame);
// 观察可以怎么实现的
Image convert = new JavaFXFrameConverter().convert(frame);
// 更新
imageVideo.setImage(convert);
} catch (Exception e) {
e.printStackTrace();
}
}
}, 2000, 1000 / frameRate);
}
/**
* 音视频合并为一个视频
*/
private void composeVideo() throws Exception {
// 合成视频
FFmpegFrameGrabber imageGrabber = new FFmpegFrameGrabber(videoFile);
imageGrabber.start();
FFmpegFrameGrabber audioGrabber = new FFmpegFrameGrabber(audioFile);
audioGrabber.start();
File file = new File("D://video666666.avi");
if (file.exists())
file.delete();
// 流媒体输出地址，分辨率（长，高），是否录制音频（0:单声道/1:立体声）
FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(file, imageGrabber.getImageWidth(),
imageGrabber.getImageHeight(), 1);
recorder.setInterleaved(true);
recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
recorder.start(imageGrabber.getFormatContext());
long videoTime = imageGrabber.getLengthInTime();
AVPacket packet = null;
for (; (packet = imageGrabber.grabPacket()) != null; ) {
recorder.recordPacket(packet);
}
Frame sampleFrame = null;
while ((sampleFrame = audioGrabber.grabSamples()) != null) {
recorder.record(sampleFrame);
if (audioGrabber.getTimestamp() >= videoTime) {
break;
}
}
recorder.close();
audioGrabber.close();
imageGrabber.close();
System.out.println("视频合成完毕！");
}
private void startAudio() {
// 录音
new Thread(new Runnable() {
@Override
public void run() {
try {
AudioFormat audioFormat = new AudioFormat(44100.0F, 16, 2, true, false);
DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
// 可以捕捉不同声道
line = (TargetDataLine) AudioSystem.getLine(dataLineInfo);
line.open(audioFormat);
line.start();
audioFile = File.createTempFile(String.valueOf(System.currentTimeMillis()), ".wav");
AudioInputStream ais = new AudioInputStream(line);
// start recording
AudioSystem.write(ais, AudioFileFormat.Type.WAVE, audioFile);
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
public static void main(String[] args) throws Exception {
launch(args);
}
}
