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Client for VNC video streaming

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

        ODБOïO 1 Reply Last reply
        1
        • SGaistS SGaist

          I would try calling get_init before creating the QApplication object.

          ODБOïO Offline
          ODБOïO Offline
          ODБOï
          wrote on last edited by ODБOï
          #35

          @SGaist thx
          but i have the same issue when i call gst_Init() before creating QApplication object.

          int main(int argc, char *argv[])
          {
              putenv("GST_PLUGIN_PATH=C:\\gstreamer\\1.0\\x86_64\\lib\\gstreamer-1.0\\");
              gst_init(&argc, &argv); // << crash
          
              QApplication a(argc, argv);
              MainWindow w;
              w.showMaximized();
          ...
          

          The only output i get is :

          11:52:22: The process was ended forcefully.
          11:52:22: C:/Users/lev/Documents/build-QVNCClient-Desktop_Qt_5_12_0_MinGW_64_bit-Release/release/QVNCClient crashed.
          

          i tryed to see more information about the crash in Windows event viewer but nothing is reported there

          Windows 7
          Qt5.12
          GNU Make 4.2.1 built for x86_64-w64-mingw32

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #36

            Did you add the path to where the gstreamer dlls can be found to the PATH environment variable ? This should be done in the Run part of the Project panel.

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

            ODБOïO 2 Replies Last reply
            1
            • SGaistS SGaist

              Did you add the path to where the gstreamer dlls can be found to the PATH environment variable ? This should be done in the Run part of the Project panel.

              ODБOïO Offline
              ODБOïO Offline
              ODБOï
              wrote on last edited by
              #37

              @SGaist
              In the Run part of the Project panel i can see a checked checkbox , "Add build library search path to PATH"

              1 Reply Last reply
              0
              • SGaistS SGaist

                Did you add the path to where the gstreamer dlls can be found to the PATH environment variable ? This should be done in the Run part of the Project panel.

                ODБOïO Offline
                ODБOïO Offline
                ODБOï
                wrote on last edited by
                #38

                @SGaist sry! this is my stupid error to forget copying gstreamers dlls near my app.

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #39

                  Nothing stupid, it happened to all developers working on Windows at some point or the other.

                  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

                    Nothing stupid, it happened to all developers working on Windows at some point or the other.

                    ODБOïO Offline
                    ODБOïO Offline
                    ODБOï
                    wrote on last edited by
                    #40

                    @SGaist
                    Thank you so much for your time.
                    GStreamer is now initialized successfully!
                    Now I'm trying too find documentation about 'pipeline' concept, this is very unclear for me

                    1 Reply Last reply
                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #41

                      A GStreamer pipeline is basically a list of module that you chain to each other from the source to the sink to, for example, read an audio file, decode it and finally send it to your audio output.

                      From a command line point of view, it's the elements built from the parameters you give to gst-launch.

                      For example:
                      Play the mp3 music file "music.mp3" using a libmad-based plugin and output to an OSS device:

                      gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert ! audioresample ! osssink
                      

                      The documentation of get-launch gives you more good examples.
                      The API tutorials are pretty nice to get started.

                      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

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