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Access IP camera from Qt

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ip cameracameraqml
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  • M Offline
    M Offline
    mvuori
    wrote on last edited by
    #5

    "Very slow" doesn't tell much. But apparently you are asking for a frame every 200 ms, giving 5 fps, which obviously is very slow if you expect normal video display quality...

    mkrrM 1 Reply Last reply
    0
    • SGaistS SGaist

      What type of camera is it ?

      mkrrM Offline
      mkrrM Offline
      mkrr
      wrote on last edited by
      #6

      @SGaist

      I'm using a camera D-LINK DCS-930L. Thanks

      1 Reply Last reply
      0
      • M mvuori

        "Very slow" doesn't tell much. But apparently you are asking for a frame every 200 ms, giving 5 fps, which obviously is very slow if you expect normal video display quality...

        mkrrM Offline
        mkrrM Offline
        mkrr
        wrote on last edited by
        #7

        @mvuori Yes, I think strange too. But, I'm using the same program to do written on serial port. Each written on serial port is with interval around 300ms. The return of the serial port, is writing on QML too.

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #8

          Are you doing any blocking function call ? e.g. for your serial port ?

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          mkrrM 1 Reply Last reply
          0
          • SGaistS SGaist

            Are you doing any blocking function call ? e.g. for your serial port ?

            mkrrM Offline
            mkrrM Offline
            mkrr
            wrote on last edited by
            #9

            @SGaist No, I'm using a Qthread to execute the serial port

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #10

              Can you describe the various parts of your application so we can ensure that they are not influencing each other.

              By the way, there's no need to set cache each time. Just set the property where you declarer image1. That's one less thing consuming time uselessly.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

              mkrrM 1 Reply Last reply
              0
              • SGaistS SGaist

                Can you describe the various parts of your application so we can ensure that they are not influencing each other.

                By the way, there's no need to set cache each time. Just set the property where you declarer image1. That's one less thing consuming time uselessly.

                mkrrM Offline
                mkrrM Offline
                mkrr
                wrote on last edited by mkrr
                #11

                @SGaist It's my main function:

                int main(int argc, char *argv[])
                {
                    QApplication app(argc, argv);
                    QDeclarativeView *engine = new QmlApplicationViewer();
                    
                    Gps *gps = new Gps(); // Class to read Gps (serial port 0). Interval: 10000ms
                    
                    SerialPort *serial = new SerialPort(); // Read Serial Port (serial port 1). Interval: 300ms
                    
                   if(serial->getMonitor()) {
                        qDebug() << "Starting Monitor";
                        Monitor *monitor = new Monitor(engine, serial);
                        serial->setMonitor(monitor);
                    }
                    return app.exec();
                }
                

                The class SerialPort start the write on serial port with a forever loop. Its working well, without delays.

                When the serial read the response, the response is sent to monitor Class and this class is responsable to format the digits and write on screen (QML file). Therefore, each 300 ms my QML file is updated too (with the response of serial port).

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  Then where's the camera in that setup ?

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  mkrrM 1 Reply Last reply
                  0
                  • SGaistS SGaist

                    Then where's the camera in that setup ?

                    mkrrM Offline
                    mkrrM Offline
                    mkrr
                    wrote on last edited by
                    #13

                    @SGaist The camera is loaded in a different QML, look:

                    import QtQuick 1.1
                    
                    Rectangle {
                        width: 300
                        height: 400
                    
                        Image {
                            id: camera1
                            objectName: "camera1"
                            x: 39
                            y: 0
                            width: 160
                            height: 120
                            source: "http://192.168.0.110/image/jpeg.cgi"
                            cache: false
                    
                            Timer {
                                interval: 300
                                running: true
                                repeat: true
                                onTriggered: {
                                    camera1.source = "http://192.168.0.110/image/jpeg.cgi";
                                }
                            }
                        }
                    ...
                    }
                    
                    

                    The QML is loaded on Monitor class:

                    Monitor::Monitor(QDeclarativeView *engine, Monitor *m)
                    {
                        engine->setSource(QUrl("qrc:/views/Monitor.qml"));
                    
                        window = qobject_cast< QObject * >( engine->rootObject() );
                    
                        engine->showFullScreen();
                        monitor = m;
                    
                        engine->rootContext()->setContextProperty("mainmonitor",this);
                    }
                    
                    1 Reply Last reply
                    0
                    • K Offline
                      K Offline
                      kolegs
                      wrote on last edited by
                      #14

                      You can also try to load next image when previous one is loaded by checking the status.
                      I use this in my application when loading jpeg from cameras.
                      You just need to set 2 Image objects and show them when Image is ready

                      mkrrM 1 Reply Last reply
                      0
                      • K kolegs

                        You can also try to load next image when previous one is loaded by checking the status.
                        I use this in my application when loading jpeg from cameras.
                        You just need to set 2 Image objects and show them when Image is ready

                        mkrrM Offline
                        mkrrM Offline
                        mkrr
                        wrote on last edited by
                        #15

                        @kolegs how I can do to check the status? Could you show an exemple? Are you using the QML Time to update the frames? Thank you

                        1 Reply Last reply
                        0
                        • K Offline
                          K Offline
                          kolegs
                          wrote on last edited by
                          #16

                          You just need to create two Images with same position add property

                          visible: status == Image.ready
                          

                          and on also add sth like this

                          onStatusChanged:{
                             if(status == Image.ready){
                                //here reload the other image
                                image2.source = "";
                                image2.source = cameraSource;
                             }
                          }
                          

                          Add the same thing in image2 but this timer reload image1

                          onStatusChanged:{
                             if(status == Image.ready){
                                //here reload the other image
                                image1.source = "";
                                image1.source = cameraSource;
                             }
                          }
                          

                          Also at creation just set source to cameraSource for one image and for the other leave it empty,.

                          Hope it helps.

                          mkrrM C 2 Replies Last reply
                          1
                          • K kolegs

                            You just need to create two Images with same position add property

                            visible: status == Image.ready
                            

                            and on also add sth like this

                            onStatusChanged:{
                               if(status == Image.ready){
                                  //here reload the other image
                                  image2.source = "";
                                  image2.source = cameraSource;
                               }
                            }
                            

                            Add the same thing in image2 but this timer reload image1

                            onStatusChanged:{
                               if(status == Image.ready){
                                  //here reload the other image
                                  image1.source = "";
                                  image1.source = cameraSource;
                               }
                            }
                            

                            Also at creation just set source to cameraSource for one image and for the other leave it empty,.

                            Hope it helps.

                            mkrrM Offline
                            mkrrM Offline
                            mkrr
                            wrote on last edited by
                            #17

                            @kolegs Thank you so much. I created this code and the performance was very better. I'm reading two IP cameras now with it.

                            Of course that the delay is existing (each 2 seconds the image is updated). I think that I need to improve my code. I'm using 98% of my CPU, but I need to do many routines :(

                            Thank you so much again

                            1 Reply Last reply
                            0
                            • K kolegs

                              You just need to create two Images with same position add property

                              visible: status == Image.ready
                              

                              and on also add sth like this

                              onStatusChanged:{
                                 if(status == Image.ready){
                                    //here reload the other image
                                    image2.source = "";
                                    image2.source = cameraSource;
                                 }
                              }
                              

                              Add the same thing in image2 but this timer reload image1

                              onStatusChanged:{
                                 if(status == Image.ready){
                                    //here reload the other image
                                    image1.source = "";
                                    image1.source = cameraSource;
                                 }
                              }
                              

                              Also at creation just set source to cameraSource for one image and for the other leave it empty,.

                              Hope it helps.

                              C Offline
                              C Offline
                              claudia0078
                              Banned
                              wrote on last edited by
                              #18
                              This post is deleted!
                              1 Reply Last reply
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