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Building with Gstreamer on Windows

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  • erikherzE Offline
    erikherzE Offline
    erikherz
    wrote on last edited by
    #14

    According to this article, yes:
    https://forum.qt.io/topic/34055/how-does-qtcreator-know-when-to-re-run-qmake/5

    I re-started QT Creator and made a point of changing the .pro file. It re-parse and reset.

    ... same error.

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    • erikherzE Offline
      erikherzE Offline
      erikherz
      wrote on last edited by
      #15

      I did a clean install of QT Creator with the MSVC Gstreamer installers and got past that initial error. Now my error is in the Gstreamer integration code. I consider this progress!
      Screen Shot 2020-03-13 at 9.40.18 AM.png

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      • erikherzE Offline
        erikherzE Offline
        erikherz
        wrote on last edited by
        #16

        Making some progress. Now it is compiling after I added:

        LIBS += -lgstvideo-1.0

        Now we are trying to get gstreamer to find its own plugins:

        14:31:17: Starting C:\GIT\build-slim-Desktop_Qt_5_14_1_MinGW_64_bit-Debug\slim.exe ...

        (slim.exe:4476): GStreamer-WARNING **: 14:31:24.371: Failed to load plugin 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstopenh264.dll': 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstopenh264.dll': The specified procedure could not be found.

        (slim.exe:4476): GStreamer-WARNING **: 14:31:25.826: Failed to load plugin 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstsrt.dll': 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstsrt.dll': The specified procedure could not be found.
        WARNING: no real random source present!
        14:31:30: C:\GIT\build-slim-Desktop_Qt_5_14_1_MinGW_64_bit-Debug\slim.exe exited with code 1

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        • erikherzE Offline
          erikherzE Offline
          erikherz
          wrote on last edited by
          #17

          This does the trick for making sure that Gstreamer finds its own plugins:
          gstreamer_plugins.png

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          • erikherzE Offline
            erikherzE Offline
            erikherz
            wrote on last edited by
            #18

            Also here is my win32 block in my .pro file for reference:

            win32 {
                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\include\glib-2.0\include
            
            
                DEPENDPATH += c:\gstreamer\1.0\x86_64\lib
            
                LIBS += -Lc:\gstreamer\1.0\x86_64\lib
                LIBS += c:\gstreamer\1.0\x86_64\lib\glib-2.0.lib
                LIBS += -lglib-2.0 -lwinpthread -lgstreamer-1.0 -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0
                LIBS += -lgstvideo-1.0
            
                CONFIG += c:\gstreamer\1.0\x86_64\lib\pkgconfig
            }
            
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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #19

              Looks like pkg-config did not work correctly but still... the manual way did work !

              Glad you found a way and thanks for sharing !

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

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              • erikherzE Offline
                erikherzE Offline
                erikherz
                wrote on last edited by
                #20

                Also for Windows, I needed to use d3dvideosink or autovideosink rather than glimagesink

                It builds and renders the Gstreamer sample video.

                Now my issue is getting it to stay within the application window rather than popping out into its own new window.

                I got this error:

                ** (slim_qt.exe:5908): CRITICAL **: 16:15:15.218: gst_video_overlay_set_window_handle: assertion 'overlay != NULL' failed
                

                So I added:

                    qDebug() << "slim_qt:gst() xwinid = " + QVariant(xwinid).toString();
                

                and got this:

                "slim_qt:gst() xwinid = 1770362"
                

                So I am wondering why gst_video_overlay_set_window_handle failed.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #21

                  You might want to take a look at the GStreamer backend plugin. With recent versions of Qt you can build custom pipelines and make them output to a Qt video widget naming the sink properly.

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

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                  • erikherzE Offline
                    erikherzE Offline
                    erikherz
                    wrote on last edited by
                    #22

                    I would love to learn more about that. May I have a pointer to a doc? A quick search did not turn up an obvious resource for me.

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                    • erikherzE Offline
                      erikherzE Offline
                      erikherz
                      wrote on last edited by erikherz
                      #23

                      I got it to land in the QWidget. The trick was to call .show() before calling winId().

                      Here is the final .pro:

                      QT       += core gui multimediawidgets
                      
                      greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                      
                      CONFIG += c++11
                      
                      DEFINES += QT_DEPRECATED_WARNINGS
                      
                      SOURCES += \
                          main.cpp
                      
                      HEADERS +=
                      
                      CONFIG += link_pkgconfig
                      
                      PKGCONFIG += gstreamer-1.0 \
                              glib-2.0 \
                              gobject-2.0 \
                              gio-2.0
                      
                      linux {
                          PKGCONFIG += gstvideo-1.0
                          LIBS += -L/usr/lib/i386-linux-gnu/ -lgstvideo-1.0
                      }
                      
                      mac {
                          PKG_CONFIG = /usr/local/bin/pkg-config
                          PKGCONFIG += gstreamer-video-1.0
                      }
                      
                      win32 {
                          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/include/glib-2.0/include
                      
                      
                          DEPENDPATH += c:/gstreamer/1.0/x86_64/lib/
                      
                          LIBS += -Lc:/gstreamer/1.0/x86_64/lib
                          LIBS += c:/gstreamer/1.0/x86_64/lib/glib-2.0.lib
                          LIBS += -lglib-2.0 -lwinpthread -lgstreamer-1.0 -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0
                          LIBS += -lgstvideo-1.0
                      
                          CONFIG += c:/gstreamer/1.0/x86_64/lib/pkgconfig
                      }
                      
                      # Default rules for deployment.
                      qnx: target.path = /tmp/$${TARGET}/bin
                      else: unix:!android: target.path = /opt/$${TARGET}/bin
                      !isEmpty(target.path): INSTALLS += target
                      
                      

                      and main.cpp:

                      #include <QApplication>
                      #include <QFrame>
                      #include <QTimer>
                      #include <QDebug>
                      #include <QLabel>
                      #include <QWidget>
                      #include <QVBoxLayout>
                      #include <gst/gst.h>
                      #include <QtDebug>
                      
                      #include <gst/video/videooverlay.h>
                      
                      /* added to work on OSX */
                      #ifdef __APPLE__
                      #ifdef TARGET_OS_MAC
                      #include <glib/deprecated/gthread.h>
                      #endif
                      #endif
                      
                      void gst(int argc, char *argv[]) {
                      
                         gst_init (&argc, &argv);
                         QApplication app(argc, argv);
                         app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));
                      
                      
                         // prepare the pipeline
                         /*
                            GstElement *pipeline =
                                    gst_parse_launch
                                    (
                                        "videotestsrc is-live=true ! d3dvideosink",
                                    NULL);
                             GstElement *sink  =  gst_bin_get_by_name(GST_BIN(pipeline), "sink");
                         */
                      
                            GstElement *pipeline = gst_pipeline_new ("xvoverlay");
                            GstElement *src = gst_element_factory_make ("videotestsrc", NULL);
                            GstElement *sink = gst_element_factory_make ("d3dvideosink", NULL);
                            gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
                            gst_element_link (src, sink);
                      
                      
                            // prepare the ui
                      
                         QWidget window;
                      
                         QLabel *label = new QLabel("Hi");
                         QWidget *widget = new QWidget();
                      
                          QVBoxLayout qboxLayout;
                          qboxLayout.addWidget(label);
                          qboxLayout.addWidget(widget);
                          window.setLayout(&qboxLayout);
                      
                          window.resize(320, 240);
                          window.show();
                      
                      
                              WId xwinid = widget->winId();
                              qDebug() << "slim_qt:gst() xwinid = " + QVariant(xwinid).toString();
                      
                              gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);
                      
                         // run the pipeline
                      
                         GstStateChangeReturn sret = gst_element_set_state (pipeline,
                             GST_STATE_PLAYING);
                         if (sret == GST_STATE_CHANGE_FAILURE) {
                           gst_element_set_state (pipeline, GST_STATE_NULL);
                           gst_object_unref (pipeline);
                           // Exit application
                           QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
                         }
                      
                         app.exec();
                      
                      }
                      
                      int main(int argc, char *argv[])
                      {
                          gst(argc, argv);
                          return true;
                      }
                      

                      and project build ENV settings:

                      Set GSL_PLUGIN_PATH to C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0
                      Set GSTREAMER_INCDIR to C:\gstreamer\1.0\x86_64\include\gstreamer-1.0
                      Set GSTREAMER_LIBDIR to C:\gstreamer\1.0\x86_64\lib
                      Set PKG_CONFIG_PATH to C:\gstreamer\1.0\x86_64\lib\pkgconfig\
                      
                      Add to Path: C:\gstreamer\1.0\x86_64\bin\
                      
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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #24

                        QMediaPlayer::setMedia for thé documentation itself.

                        You might even be able just build the GStreamer backend and use it directly.

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

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                        • erikherzE Offline
                          erikherzE Offline
                          erikherz
                          wrote on last edited by
                          #25

                          I thought that QMediaPlayer used native AV Foundations (Windows Media Foundation for Windows, AV Foundation for MacOS, and GStreamer for Linux) ... does this mean that I can now use a gst-pipeline source for QMediaPlayer in an App on Windows or Mac?

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #26

                            QMediaPlayer does not do anything directly. It uses the various plugins. Each platform has its corresponding plugin using native technologies. However nothing forbids you to provide additional plugins like for example for network cameras. So if you manage to build the GStreamer plugin, using it should also be possible.

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

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                            • erikherzE Offline
                              erikherzE Offline
                              erikherz
                              wrote on last edited by
                              #27

                              Got it. Thank you!

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                              • erikherzE Offline
                                erikherzE Offline
                                erikherz
                                wrote on last edited by
                                #28

                                I spoke too soon. I do have the application building but video is not yet playing. I was told that the issue may be because I am using MinGW rather than MSVC. I was able to trim down a sample application which I thought that I should share in case anyone else wants to give this a try. I see the video test pattern when I build it from QT Creator but not when I deploy it as a stand alone application. If you are able to see the test pattern as a stand alone application, please post here how you got it working. Thank you!

                                mini.pro:

                                TEMPLATE = app
                                TARGET = videoapp
                                
                                QT += multimedia multimediawidgets network widgets core gui
                                
                                CONFIG += link_pkgconfig
                                
                                PKGCONFIG += gstreamer-1.0 \
                                        glib-2.0 \
                                        gobject-2.0 \
                                        gio-2.0 \
                                        gstreamer-video-1.0 \
                                        gstreamer-audio-1.0
                                
                                linux {
                                #    PKGCONFIG += gstvideo-1.0
                                    LIBS += -L/usr/lib/i386-linux-gnu/ -lgstvideo-1.0
                                    # I don't think you need the INCLUDEPATH below if pkg-config is working correctly
                                    INCLUDEPATH += \
                                        /usr/include/gstreamer-1.0 \
                                        /usr/include/glib-2.0/ \
                                        /usr/lib/x86_64-linux-gnu/glib-2.0/include/
                                }
                                
                                mac {
                                    PKG_CONFIG = /usr/local/bin/pkg-config
                                    PKGCONFIG += gstreamer-video-1.0 gstreamer-audio-1.0
                                }
                                
                                win32 {
                                ## - Everything is set in the QT Project Build ENV, including:
                                #Set GSL_PLUGIN_PATH to C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0
                                #Set GSTREAMER_INCDIR to C:\gstreamer\1.0\x86_64\include\gstreamer-1.0
                                #Set GSTREAMER_LIBDIR to C:\gstreamer\1.0\x86_64\lib
                                #Add this to Path: C:\gstreamer\1.0\x86_64\bin\
                                }
                                
                                HEADERS =
                                
                                SOURCES = \
                                    main.cpp
                                

                                main.cpp:

                                #include <QApplication>
                                #include <QTimer>
                                #include <QLabel>
                                #include <QWidget>
                                #include <QVBoxLayout>
                                #include <gst/gst.h>
                                
                                #include <gst/video/videooverlay.h>
                                
                                /* added to work on OSX */
                                #ifdef __APPLE__
                                #ifdef TARGET_OS_MAC
                                #include <glib/deprecated/gthread.h>
                                #endif
                                #endif
                                
                                void gst(int argc, char *argv[]) {
                                
                                   gst_init (&argc, &argv);
                                   QApplication app(argc, argv);
                                   app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));
                                
                                   QString videosinkStr, audiosinkStr, pipelinestr;
                                   GstElement *m_pipeline, *sink;
                                
                                   #ifdef _WIN32 // TODO: any difference on videosink definition between _WIN32 and _WIN64?
                                       videosinkStr = "d3dvideosink"; // test: dshowvideosink, d3dvideosink, directsoundsink
                                       audiosinkStr = "volume ! directsoundsink";
                                   #endif
                                   #ifdef __APPLE__
                                   #ifdef TARGET_OS_MAC
                                       videosinkStr = "glimagesink"; // also test: osxvideosink, osxaudiosink
                                       audiosinkStr = "volume ! osxaudiosink";
                                
                                   #endif
                                   #endif
                                   #ifdef __linux__
                                       videosinkStr = "xvimagesink"; // ximagesink is a winner on my PopOS machine!
                                       //also test: ximagesink, xvimagesink, alsasink, pulsesink
                                       audiosinkStr = "volume ! alsasink";
                                   #endif
                                
                                    pipelinestr = "videotestsrc ! "+videosinkStr+"  name=video_out";
                                
                                    m_pipeline = gst_parse_launch (pipelinestr.toStdString().c_str(), NULL );
                                    sink  =  gst_bin_get_by_name(GST_BIN(m_pipeline), "video_out");
                                
                                    QWidget window;
                                
                                    QLabel *label = new QLabel("Video Test Pattern");
                                    QWidget *widget = new QWidget();
                                    widget->setFixedSize(640,360);
                                    WId xwinid = widget->winId();
                                    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), guintptr(xwinid));
                                
                                    QVBoxLayout qboxLayout;
                                    qboxLayout.addWidget(label);
                                    qboxLayout.addWidget(widget);
                                    window.setLayout(&qboxLayout);
                                
                                    window.resize(660, 380);
                                    window.show();
                                
                                   // run the pipeline
                                
                                   GstStateChangeReturn sret = gst_element_set_state (m_pipeline,
                                       GST_STATE_PLAYING);
                                   if (sret == GST_STATE_CHANGE_FAILURE) {
                                     gst_element_set_state (m_pipeline, GST_STATE_NULL);
                                     gst_object_unref (m_pipeline);
                                     // Exit application
                                     QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
                                   }
                                
                                   app.exec();
                                
                                }
                                
                                int main(int argc, char *argv[])
                                {
                                    gst(argc, argv);
                                    return true;
                                }
                                
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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #29

                                  Did you deploy your application using windeployqt ?

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

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                                  • erikherzE Offline
                                    erikherzE Offline
                                    erikherz
                                    wrote on last edited by
                                    #30

                                    Yes. It still needed the Gstreamer libs, so I copied all of those too. It also complained of other libs missing so I copied those as needed from the system until the application ran. Now it runs but video does not play. I suspect that this may be the mysterious issue with MinGW.

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                                    • erikherzE Offline
                                      erikherzE Offline
                                      erikherz
                                      wrote on last edited by
                                      #31

                                      I received some useful Gstreamer debugging information on this forum post:
                                      http://gstreamer-devel.966125.n4.nabble.com/How-to-debug-Gstreamer-on-Windows-td4693738.html

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                                      • erikherzE Offline
                                        erikherzE Offline
                                        erikherz
                                        wrote on last edited by
                                        #32

                                        OK. I got it to work by switching to MSVC, creating a plugins directory, setting a Gstreamer ENV to that path, like so: set GST_PLUGIN_PATH=C:\Users\vivoh\Desktop\mini\plugins, and dropping in the two required plugins, in this case: gstvideotestsrc.dll and gstd3d.dll

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