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Client for VNC video streaming

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  • mrjjM mrjj

    @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 ?

    ODБOïO Offline
    ODБOïO Offline
    ODБOï
    wrote on last edited by
    #14

    @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

    mrjjM 1 Reply Last reply
    0
    • ODБOïO ODБOï

      @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

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on 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.

      ODБOïO 1 Reply Last reply
      1
      • mrjjM mrjj

        @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.

        ODБOïO Offline
        ODБOïO Offline
        ODБOï
        wrote on 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.

        mrjjM 1 Reply Last reply
        0
        • ODБOïO ODБOï

          @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.

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on 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.

          ODБOïO 1 Reply Last reply
          2
          • mrjjM mrjj

            @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.

            ODБOïO Offline
            ODБOïO Offline
            ODБOï
            wrote on last edited by
            #18

            @mrjj said in Client for VNC video streaming:

            see link higher

            cant find it,

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

            mrjjM 1 Reply Last reply
            0
            • ODБOïO ODБOï

              @mrjj said in Client for VNC video streaming:

              see link higher

              cant find it,

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

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #19

              @LeLev
              yep :)

              ODБOïO 1 Reply Last reply
              1
              • mrjjM mrjj

                @LeLev
                yep :)

                ODБOïO Offline
                ODБOïO Offline
                ODБOï
                wrote on last edited by
                #20

                @mrjj
                perfect ! thank you and thank you @SGaist

                1 Reply Last reply
                0
                • SGaistS SGaist

                  Hi,

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

                  Hope it helps

                  ODБOïO Offline
                  ODБOïO Offline
                  ODБOï
                  wrote on 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
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on 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
                    • mrjjM mrjj

                      @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 ?

                      ODБOïO Offline
                      ODБOïO Offline
                      ODБOï
                      wrote on 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
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on 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

                        ODБOïO 1 Reply Last reply
                        2
                        • SGaistS SGaist

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

                          See the rfbsrc plugin.

                          ODБOïO Offline
                          ODБOïO Offline
                          ODБOï
                          wrote on 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
                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on 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

                            ODБOïO 1 Reply Last reply
                            1
                            • SGaistS SGaist

                              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.

                              ODБOïO Offline
                              ODБOïO Offline
                              ODБOï
                              wrote on 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
                              0
                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on 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

                                ODБOïO 1 Reply Last reply
                                1
                                • SGaistS SGaist

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

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

                                    ODБOïO 1 Reply Last reply
                                    1
                                    • SGaistS SGaist

                                      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.

                                      ODБOïO Offline
                                      ODБOïO Offline
                                      ODБOï
                                      wrote on 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
                                      0
                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on 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

                                        ODБOïO 1 Reply Last reply
                                        1
                                        • SGaistS SGaist

                                          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.

                                          ODБOïO Offline
                                          ODБOïO Offline
                                          ODБOï
                                          wrote on 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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