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Client for VNC video streaming

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  • O ODБOï
    4 Jan 2019, 22:46

    @mrjj said in Client for VNC video streaming:

    Also considering its the operator that controls the recording. ( i though it would be you)

    I need to minimize operator intervention. He will only start the pc the rest must be done automatically.

    20-30 fps and descent ~480p+ is enough

    M Offline
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    mrjj
    Lifetime Qt Champion
    wrote on 4 Jan 2019, 22:59 last edited by
    #15

    @LeLev

    Ok, so it must auto connect and record and make sure not to fill disk with video.
    The QVNCClientWidget should make it fairly easy to connect etc but
    it seems not to have a direct way of save to video.
    However, it exposes the image directly as QImage so you should be able to
    create a video somehow.

    O 1 Reply Last reply 4 Jan 2019, 23:07
    1
    • M mrjj
      4 Jan 2019, 22:59

      @LeLev

      Ok, so it must auto connect and record and make sure not to fill disk with video.
      The QVNCClientWidget should make it fairly easy to connect etc but
      it seems not to have a direct way of save to video.
      However, it exposes the image directly as QImage so you should be able to
      create a video somehow.

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      ODБOï
      wrote on 4 Jan 2019, 23:07 last edited by
      #16

      @mrjj said in Client for VNC video streaming:

      QVNCClientWidget

      Really ?! awsome there is a ready to use Qt Class !
      i was not expecting this conclusion at all
      Thank you very much for info and for your time!
      I will play with QVNCClientWidget this weekend and get into this monday.

      M 1 Reply Last reply 4 Jan 2019, 23:19
      0
      • O ODБOï
        4 Jan 2019, 23:07

        @mrjj said in Client for VNC video streaming:

        QVNCClientWidget

        Really ?! awsome there is a ready to use Qt Class !
        i was not expecting this conclusion at all
        Thank you very much for info and for your time!
        I will play with QVNCClientWidget this weekend and get into this monday.

        M Offline
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        mrjj
        Lifetime Qt Champion
        wrote on 4 Jan 2019, 23:19 last edited by
        #17

        @LeLev
        Hi
        Yes, SGaist was so kind to dig one up. :) (see link higher up)
        Its not part of official Qt but Qt never the less.
        Its from 2016 so seems pretty recent.
        So the biggest issue will be to produce a video from the frames. Preferable compressed
        if video size matters.

        O 1 Reply Last reply 4 Jan 2019, 23:49
        2
        • M mrjj
          4 Jan 2019, 23:19

          @LeLev
          Hi
          Yes, SGaist was so kind to dig one up. :) (see link higher up)
          Its not part of official Qt but Qt never the less.
          Its from 2016 so seems pretty recent.
          So the biggest issue will be to produce a video from the frames. Preferable compressed
          if video size matters.

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          ODБOï
          wrote on 4 Jan 2019, 23:49 last edited by
          #18

          @mrjj said in Client for VNC video streaming:

          see link higher

          cant find it,

          https://bitbucket.org/amahta/qvncclient/src ?

          M 1 Reply Last reply 5 Jan 2019, 00:20
          0
          • O ODБOï
            4 Jan 2019, 23:49

            @mrjj said in Client for VNC video streaming:

            see link higher

            cant find it,

            https://bitbucket.org/amahta/qvncclient/src ?

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            mrjj
            Lifetime Qt Champion
            wrote on 5 Jan 2019, 00:20 last edited by
            #19

            @LeLev
            yep :)

            O 1 Reply Last reply 5 Jan 2019, 00:44
            1
            • M mrjj
              5 Jan 2019, 00:20

              @LeLev
              yep :)

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              ODБOï
              wrote on 5 Jan 2019, 00:44 last edited by
              #20

              @mrjj
              perfect ! thank you and thank you @SGaist

              1 Reply Last reply
              0
              • S SGaist
                4 Jan 2019, 22:12

                Hi,

                This article and the linked repository might be just what you need.

                Hope it helps

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                ODБOï
                wrote on 5 Jan 2019, 00:48 last edited by
                #21

                @SGaist said in Client for VNC video streaming:

                This article and the linked repository might be just what you need

                omg.. sorry i did not see your messages. my bad.
                Thank you very much

                1 Reply Last reply
                0
                • S Offline
                  S Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on 5 Jan 2019, 19:49 last edited by
                  #22

                  No worries ;-)

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

                  1 Reply Last reply
                  1
                  • M mrjj
                    4 Jan 2019, 22:37

                    @LeLev
                    Ah, well even most tools can be controlled by scripts, using a Qt program would be more solid.
                    Also considering its the operator that controls the recording. ( i though it would be you)
                    it has to be really smooth operating so a Qt app seems like good idea.

                    How many FPS do you need to record ?

                    O Offline
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                    ODБOï
                    wrote on 7 Jan 2019, 15:12 last edited by
                    #23

                    @mrjj said in Client for VNC video streaming:

                    How many FPS do you need to record

                    Hi,
                    So finally, thaks to you and SGaist the server is running on the machine i want to connect,
                    on the other side, i have my QVNCClientWidget that connects and shows the first machine GUI.

                    Now, i need to record the screen.

                    I simply added my signal ' void saveImg(QImage );' to **QVNCClientWidget **,
                    that signal is emited in QVNCClientWidget::paintEvent

                    i'm passing the screen images to a slot that will save them as simple images.

                    void QVNCClientWidget::paintEvent(QPaintEvent *)
                    {
                        if(screen.isNull())
                        {
                            screen = QImage(width(), height(), QImage::Format_RGB32);
                            screen.fill(Qt::red);
                    
                        }
                    
                         emit saveImg(screen); 
                    
                        QPainter painter;
                        painter.begin(this);
                        painter.drawImage(0, 0, screen.scaled(width(), height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
                        painter.end();
                    }
                    

                    So, for now i'm only recording all the frames as .png images, and then i can reconstruct a video with a 3rd party tool (VirtualDub).
                    To reconstruct a video my tool needs a parameter FPS (and it must match with my program FPS , if not, video is to fast or to slow)
                    Is there a way to specify the FPS with QVNCClientWidget ?

                    Or do you see a solution to create the video with the images directly in my qt app ? I read its possible with LibAvi or Opencv but can't find Qt only solution.

                    Thank you

                    1 Reply Last reply
                    0
                    • S Offline
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                      SGaist
                      Lifetime Qt Champion
                      wrote on 7 Jan 2019, 15:55 last edited by
                      #24

                      One thing you could do is use GStreamer to connect to your VNC server and record the video.

                      See the rfbsrc plugin.

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

                      O 1 Reply Last reply 7 Jan 2019, 16:31
                      2
                      • S SGaist
                        7 Jan 2019, 15:55

                        One thing you could do is use GStreamer to connect to your VNC server and record the video.

                        See the rfbsrc plugin.

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                        ODБOï
                        wrote on 7 Jan 2019, 16:31 last edited by
                        #25

                        @SGaist
                        thank you very much, i will try that. But do you mean i no more need the QVNCClientWidget ? or i need to integrate GStreamer with my widget ?
                        I wanted to create my qt application client to have control on it : automatically stop/start recording/ delete when on some conditions is meet etc...
                        THX!

                        1 Reply Last reply
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                          SGaist
                          Lifetime Qt Champion
                          wrote on 7 Jan 2019, 21:07 last edited by
                          #26

                          The idea is that you can use your widget for looking at whatever you need and GStreamer for the recording part which will allow you to generate a video file directly and not put a heavy load on your GUI thread.

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

                          O 1 Reply Last reply 7 Jan 2019, 21:17
                          1
                          • S SGaist
                            7 Jan 2019, 21:07

                            The idea is that you can use your widget for looking at whatever you need and GStreamer for the recording part which will allow you to generate a video file directly and not put a heavy load on your GUI thread.

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                            ODБOï
                            wrote on 7 Jan 2019, 21:17 last edited by
                            #27

                            @SGaist
                            i don't need to look the screen i don't want gui, i only need the record part.

                            1 Reply Last reply
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                            • S Offline
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                              SGaist
                              Lifetime Qt Champion
                              wrote on 7 Jan 2019, 21:22 last edited by
                              #28

                              In that case, using GStreamer would simplify the process of creating the video especially at the speed of the stream you get.

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

                              O 1 Reply Last reply 8 Jan 2019, 08:53
                              1
                              • S SGaist
                                7 Jan 2019, 21:22

                                In that case, using GStreamer would simplify the process of creating the video especially at the speed of the stream you get.

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                                ODБOï
                                wrote on 8 Jan 2019, 08:53 last edited by ODБOï 1 Aug 2019, 08:55
                                #29

                                hi,
                                @SGaist said in Client for VNC video streaming:

                                simplify

                                how to use it please? I want to build GStreamer with this forum article help
                                but the link is down : https://cgit.freedesktop.org/gstreamer/qt-gstreamer
                                https://gitlab.freedesktop.org/gstreamer/qt-gstreamerSource download/src/qt-gstreamer

                                1 Reply Last reply
                                0
                                • S Offline
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                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on 8 Jan 2019, 21:24 last edited by
                                  #30

                                  The link is back up however, the bindings should be considered outdated.

                                  Since you won't be looking at the the stream itself, what you can do is use the gstreamer API directly.

                                  Use the command line to find the best pipeline for your needs and then you can use something like GstParse to generate the pipeline in your code and then start it.

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

                                  O 1 Reply Last reply 9 Jan 2019, 08:31
                                  1
                                  • S SGaist
                                    8 Jan 2019, 21:24

                                    The link is back up however, the bindings should be considered outdated.

                                    Since you won't be looking at the the stream itself, what you can do is use the gstreamer API directly.

                                    Use the command line to find the best pipeline for your needs and then you can use something like GstParse to generate the pipeline in your code and then start it.

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                                    ODБOï
                                    wrote on 9 Jan 2019, 08:31 last edited by
                                    #31

                                    Hi @SGaist

                                    Please tell me what command line are you talking about, I'm reading some introduction to GStreamer because ive never heared about it. What is the pipeline ? Thank you for the links, i'm looking for more general introduction/tutorial documents

                                    What are the drawbacks of my current solution please ? : Connecting with QVNCClientWidget, and then saving an image every time Gui is refreshed, i get 15 fps and it's enough for me.

                                    Thank you very mush for the help

                                    1 Reply Last reply
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                                    • S Offline
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                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on 9 Jan 2019, 22:09 last edited by
                                      #32

                                      gst-launch-1.0 is the tool

                                      The drawback is as you wrote, you have to build the video afterwards and you don't really know the frame rate of it.

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

                                      O 1 Reply Last reply 10 Jan 2019, 10:37
                                      1
                                      • S SGaist
                                        9 Jan 2019, 22:09

                                        gst-launch-1.0 is the tool

                                        The drawback is as you wrote, you have to build the video afterwards and you don't really know the frame rate of it.

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                                        ODБOï
                                        wrote on 10 Jan 2019, 10:37 last edited by
                                        #33

                                        @SGaist hello,

                                        I installed gstreamer-1.0-devel-x86_64-1.14.3
                                        (I dit not built it)
                                        and linked my app against it adding this in my .pro

                                        INCLUDEPATH += c:/gstreamer/1.0/x86_64/include \
                                                c:/gstreamer/1.0/x86_64/lib/gstreamer-1.0/include \
                                                c:/gstreamer/1.0/x86_64/include/gstreamer-1.0 \
                                                c:/gstreamer/1.0/x86_64/include/glib-2.0\
                                                c:/gstreamer/1.0/x86_64/include/glib-2.0/glib \
                                                c:/gstreamer/1.0/x86_64/lib/glib-2.0/include
                                        
                                        LIBS += -Lc:/gstreamer/1.0/x86_64/lib
                                        LIBS +=  -lgstreamer-1.0 -lglib-2.0 -lwinpthread -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0
                                        CONFIG += c:/gstreamer/1.0/x86_64/lib/pkgconfig
                                        

                                        My app will compile but crash as soon i run it and gst_init(&argc, &argv) is called...
                                        I can't even put breakpoints, debuggings stops immediately

                                        #include "mainwindow.h"
                                        #include <QApplication>
                                        #include <gst/gst.h>
                                        #include <QDebug>
                                        
                                        int main(int argc, char *argv[])
                                        {
                                            QApplication a(argc, argv);
                                            MainWindow w;
                                            w.showMaximized();
                                            GstElement *pipeline;
                                            GstBus *bus;
                                            GstMessage *msg;
                                            putenv("GST_PLUGIN_PATH=C:\\gstreamer\\1.0\\x86_64\\lib\\gstreamer-1.0\\");
                                            gst_init(&argc, &argv); // << crash
                                            return a.exec();
                                            }
                                        

                                        Could you please tell me if you see something ?
                                        Thank you for help

                                        1 Reply Last reply
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                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on 10 Jan 2019, 10:42 last edited by
                                          #34

                                          I would try calling get_init before creating the QApplication object.

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

                                          O 1 Reply Last reply 10 Jan 2019, 10:52
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