javaCV开发详解之推流器和录制器的实现

/**

  * 按帧录制本机摄像头视频（边预览边录制，停止预览即停止录制）

  *

  * @author eguid

  * @param outputFile -录制的文件路径，也可以是rtsp或者rtmp等流媒体服务器发布地址

  * @param frameRate - 视频帧率

  * @throws Exception

  * @throws InterruptedException

  * @throws org.bytedeco.javacv.FrameRecorder.Exception

  */

public static void recordCamera(String outputFile, double frameRate){

     //另一种方式获取摄像头，opencv抓取器方式获取摄像头请参考第一章，FrameGrabber会自己去找可以打开的摄像头的抓取器。

     FrameGrabber grabber = FrameGrabber.createDefault( 0 ); //本机摄像头默认0

     grabber.start(); //开启抓取器

     OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage(); //转换器

     IplImage grabbedImage = converter.convert(grabber.grab()); //抓取一帧视频并将其转换为图像，至于用这个图像用来做什么？加水印，人脸识别等等自行添加

     int width = grabbedImage.width();

     int height = grabbedImage.height();

     FrameRecorder recorder = FrameRecorder.createDefault(outputFile, width, height);

     recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264); // avcodec.AV_CODEC_ID_H264，编码

     recorder.setFormat( "flv" ); //封装格式，如果是推送到rtmp就必须是flv封装格式

     recorder.setFrameRate(frameRate);

     recorder.start(); //开启录制器

     long startTime= 0 ;

     long videoTS= 0 ;

     CanvasFrame frame = new CanvasFrame( "camera" , CanvasFrame.getDefaultGamma() / grabber.getGamma());

     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     frame.setAlwaysOnTop( true );

     Frame rotatedFrame=converter.convert(grabbedImage); //不知道为什么这里不做转换就不能推到rtmp

     while (frame.isVisible() && (grabbedImage = converter.convert(grabber.grab())) != null ) {

         rotatedFrame = converter.convert(grabbedImage);

         frame.showImage(rotatedFrame);

         if (startTime == 0 ) {

             startTime = System.currentTimeMillis();

         }

         videoTS = 1000 * (System.currentTimeMillis() - startTime);

         recorder.setTimestamp(videoTS);

         recorder.record(rotatedFrame);

         Thread.sleep( 40 );

     }

     frame.dispose(); //关闭窗口

     recorder.close(); //关闭推流录制器，close包含release和stop操作

     grabber.close(); //关闭抓取器

}

public static void main(String[] args) throws Exception, InterruptedException, org.bytedeco.javacv.FrameRecorder.Exception {

     recordCamera( "output.mp4" , 25 );

}

public static void main(String[] args) throws Exception, InterruptedException, org.bytedeco.javacv.FrameRecorder.Exception {

     recordCamera( "rtmp://192.168.30.21/live/record1" , 25 );

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