【java】使用opencv获取摄像头并推流

1、环境

OSX 12.5

Java8

vscode

 

2、脚本

JavaCvCameraTest.java

import javax.swing.JFrame;import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.javacpp.Loader;
import org.bytedeco.javacv.*;
import org.bytedeco.opencv.global.opencv_objdetect;
import org.bytedeco.opencv.opencv_core.IplImage;public class JavaCvCameraTest
{public static void recordCamera(String outputFile, double frameRate)throws Exception, InterruptedException {Loader.load(opencv_objdetect.class);FrameGrabber grabber = FrameGrabber.createDefault(0);//本机摄像头默认0，这里使用javacv的抓取器，至于使用的是ffmpeg还是opencv，请自行查看源码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rtmpwhile (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();recorder.stop();recorder.release();grabber.stop();}public static void main(String[] args) throws Exception, InterruptedException {recordCamera("rtmp://192.168.10.225:1935/stream/example",25); //推流到rtmp服务器
    }}

 

 

 

3、pom.xml相关依赖

    <dependencies><dependency><groupId>org.bytedeco</groupId><artifactId>javacv-platform</artifactId><version>1.5.7</version></dependency><dependency><groupId>org.bytedeco</groupId><artifactId>javacpp</artifactId><version>1.5.7</version></dependency></dependencies>

调用摄像头需要权限，mac需要配置允许vscode

 

 

参考链接：

https://answers.opencv.org/question/225281/videocapture-0-does-not-work-in-mac-catalina-the-program-crashed/