在OpenCV 3.2和Java中未检测到IP摄像机

Question

Have anyone able to use ip camera with open cv with Java. I used the below code which was working fine for the web camera. But when i Tried to use a ip cam it was not working

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.ByteBuffer;
import javax.imageio.ImageIO;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;
import org.opencv.videoio.VideoCapture;

import com.amazonaws.services.rekognition.model.Image;
import com.amazonaws.util.IOUtils;
import com.wso2telco.rnd.ui.DashBoard;
import com.wso2telco.rnd.ui.UI;

public class TestIPCamera {

private static final long SLEEP_TIME = 1000;
private static VideoCapture camera;
private static FaceComparer comparer;
private static UI ui;
private static DashBoard dashUi;

public static void main(String args[]) {

    comparer = new FaceComparer();

    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    //nu.pattern.OpenCV.loadLocally();
    System.loadLibrary("opencv_java320");

    camera = new VideoCapture();
    camera.open("http://192.168.1.2:8080/video?video=x.mpjeg");
    System.out.println(camera.isOpened());
    while(!camera.isOpened()) {
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    if (!camera.isOpened()) {
        System.out.println("Camera Error");
    } else {
        System.out.println("Camera Ready");
        ui = new UI();
        dashUi = new DashBoard();

    }
    while(true){
        runImage();
    }
}

I tried many suggestions given in other threads but couldn't find a concrete answer for the issue.

Answer 1

After Trying different options Finally i resolved the issue by installing the Open CV 3.4.1 version the issue got resolved.

When you install open cv it shows an output like below. there you can check that FFMPEG: is stated as NO This configuration stops the code of using the IP cams in the code. To avoid this mis configuration you need install Open CV with the -D WITH_FFMPEG=ON .. to solve this problem

    --   OpenCV modules:
--     To be built:                 core flann hdf imgproc ml objdetect phase_unwrapping photo plot reg surface_matching video xphoto bgsegm dnn face freetype fuzzy img_hash imgcodecs shape videoio xobjdetect highgui superres ts bioinspired dpm features2d line_descriptor saliency text calib3d ccalib datasets rgbd stereo structured_light tracking videostab xfeatures2d ximgproc aruco java optflow stitching python3
--     Disabled:                    world contrib_world
--     Disabled by dependency:      -
--     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev python2 viz cnn_3dobj cvv dnn_modern matlab sfm
-- 
--   GUI: 
--     QT:                          NO
--     GTK+ 3.x:                    YES (ver 3.20.9)
--     GThread :                    YES (ver 2.50.2)
--     GtkGlExt:                    NO
--     OpenGL support:              NO
--     VTK support:                 NO
-- 
--   Media I/O: 
--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.8)
--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
--     WEBP:                        build (ver encoder: 0x020e)
--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.25)
--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 4.0.6)
--     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
--     OpenEXR:                     /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.2.0)
--     GDAL:                        NO
--     GDCM:                        NO
-- 
--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  YES (ver 2.2.4)
--     FFMPEG:                      NO
--       avcodec:                    NO
--       avformat:                   NO
--       avutil:                     NO
--       swscale:                    NO
--       avresample:                 NO
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     OpenNI2:                     NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     Aravis SDK:                  NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    NO/YES
--     XIMEA:                       NO
--     Xine:                        NO
--     Intel Media SDK:             NO
--     gPhoto2:                     NO
-- 
--   Parallel framework:            TBB (ver 4.4 interface 9005)
-- 
--   Trace:                         YES (with Intel ITT)
-- 
--   Other third-party libraries:
--     Use Intel IPP:               2017.0.2 [2017.0.2]
--                at:               /home/hao/opencv-3.3.0/build/3rdparty/ippicv/ippicv_lnx
--     Use Intel IPP IW:            prebuilt binaries (2017.0.2)
--     Use Intel IPP Async:         NO
--     Use VA:                      NO
--     Use Intel VA-API/OpenCL:     NO
--     Use Lapack:                  NO
--     Use Eigen:                   YES (ver 3.3.4)
--     Use Cuda:                    NO
--     Use OpenCL:                  YES
--     Use OpenVX:                  NO
--     Use custom HAL:              NO
-- 
--   OpenCL:                        <Dynamic loading of OpenCL library>
--     Include path:                /home/hao/opencv-3.3.0/3rdparty/include/opencl/1.2
--     Use AMDFFT:                  NO
--     Use AMDBLAS:                 NO
-- 
--   Python 2:
--     Interpreter:                 (ver 2.7.12)
-- 
--   Python 3:
--     Interpreter:                 /usr/bin/python3 (ver 3.5.2)
--     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.5m.so (ver 3.5.2+)
--     numpy:                       /usr/local/lib/python3.5/dist-packages/numpy/core/include (ver 1.12.0)
--     packages path:               lib/python3.5/dist-packages
-- 
--   Python (for build):            
-- 
--   Java:
--     ant:                         /usr/bin/ant (ver 1.9.7)
--     JNI:                         /usr/lib/jvm/default-java/include /usr/lib/jvm/default-java/include/linux /usr/lib/jvm/default-java/include
--     Java wrappers:               YES
--     Java tests:                  YES
-- 
--   Matlab:                        Matlab not found or implicitly disabled
-- 
--   Documentation:
--     Doxygen:                     NO
-- 
--   Tests and samples:
--     Tests:                       YES
--     Performance tests:           YES
--     C/C++ Examples:              YES
-- 
--   Install path:                  /usr/local
-- 
--   cvconfig.h is in:              /home/hao/opencv-3.3.0/build
--