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QT 6.3: Streaming camera image

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  • SGaistS SGaist

    Yes, the custom pipeline has been removed. You will have to build it in C++.

    K Offline
    K Offline
    Kimosabe
    wrote on last edited by Kimosabe
    #6

    @SGaist
    qmlglsink is not supported anymore in QT 6.
    Is there some generic QT 6 sink solution for this?
    Any suggestion what shall I use to create custom pipeline?

    In past user could use GstGLVideoItem from qt part of gst-plugins-good.
    Setup gstream stuff (pipeline, src, caps. etc...) using gstream API and then assign those stuff to GstGLVideoItem.

    GstGLVideoItem is not supported in QT 6, meaning qt part of gst-plugins-good is not supported for QT 6 anymore.

    JoeCFDJ 1 Reply Last reply
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    • K Kimosabe

      @SGaist
      qmlglsink is not supported anymore in QT 6.
      Is there some generic QT 6 sink solution for this?
      Any suggestion what shall I use to create custom pipeline?

      In past user could use GstGLVideoItem from qt part of gst-plugins-good.
      Setup gstream stuff (pipeline, src, caps. etc...) using gstream API and then assign those stuff to GstGLVideoItem.

      GstGLVideoItem is not supported in QT 6, meaning qt part of gst-plugins-good is not supported for QT 6 anymore.

      JoeCFDJ Offline
      JoeCFDJ Offline
      JoeCFD
      wrote on last edited by JoeCFD
      #7

      @Kimosabe Is qmlglsink not a support from gstreamer(not from Qt) for QML? Is it dropped for Qt6? I doubt it. Do you have a link for the info?

      JoeCFDJ 1 Reply Last reply
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      • JoeCFDJ JoeCFD

        @Kimosabe Is qmlglsink not a support from gstreamer(not from Qt) for QML? Is it dropped for Qt6? I doubt it. Do you have a link for the info?

        JoeCFDJ Offline
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        JoeCFD
        wrote on last edited by JoeCFD
        #8

        @JoeCFD I googled a bit and found out it seems that qmlglsink does not support Qt6 now. But I think it will later.

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        • E Offline
          E Offline
          EinarJonG
          wrote on last edited by
          #9

          @JoeCFD

          In order for this to work, both qmlglsink and the QML "glue" org.freedesktop.gstreamer.GLVideoItem need to be compiled.

          The whole setup is littered with QT5 references, and it seems unmaintained.

          JoeCFDJ 1 Reply Last reply
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          • E EinarJonG

            @JoeCFD

            In order for this to work, both qmlglsink and the QML "glue" org.freedesktop.gstreamer.GLVideoItem need to be compiled.

            The whole setup is littered with QT5 references, and it seems unmaintained.

            JoeCFDJ Offline
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            JoeCFD
            wrote on last edited by JoeCFD
            #10

            @EinarJonG Did you notice in your link?
            qt5_element_init (GstPlugin * plugin)

            There is no qt6_element_init (GstPlugin * plugin)

            K 1 Reply Last reply
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            • JoeCFDJ JoeCFD

              @EinarJonG Did you notice in your link?
              qt5_element_init (GstPlugin * plugin)

              There is no qt6_element_init (GstPlugin * plugin)

              K Offline
              K Offline
              Kimosabe
              wrote on last edited by Kimosabe
              #11

              @JoeCFD @EinarJonG
              I looked now at "gst-plugins-good-1.22.1", by that I mean gst-plugins-good version 1.22.1 and there is a qt6 directory inside of it. Inside of that directory there is a "qt6_element_init (GstPlugin * plugin)" and new element called "GstGLQt6VideoItem", so I assume this is support for QT6, meaning "qml6glsink" is now available.

              I was looking gst-plugins-good source code at https://gstreamer.freedesktop.org/src/gst-plugins-good/ and it seems like qt6 support was introduced starting from 1.21.3 version. Please correct me if I am wrong.

              JoeCFDJ 1 Reply Last reply
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              • K Kimosabe

                @JoeCFD @EinarJonG
                I looked now at "gst-plugins-good-1.22.1", by that I mean gst-plugins-good version 1.22.1 and there is a qt6 directory inside of it. Inside of that directory there is a "qt6_element_init (GstPlugin * plugin)" and new element called "GstGLQt6VideoItem", so I assume this is support for QT6, meaning "qml6glsink" is now available.

                I was looking gst-plugins-good source code at https://gstreamer.freedesktop.org/src/gst-plugins-good/ and it seems like qt6 support was introduced starting from 1.21.3 version. Please correct me if I am wrong.

                JoeCFDJ Offline
                JoeCFDJ Offline
                JoeCFD
                wrote on last edited by JoeCFD
                #12

                @Kimosabe good to know. Thanks. Install and try it out.
                Try to get streamer source from
                https://gitlab.freedesktop.org/gstreamer/gstreamer.git
                I remember I had some issues when I downloaded the source from the link
                https://gstreamer.freedesktop.org/src/gst-plugins-good/
                to build it.

                It can be very messy to upgrade gstreamer since you may have to rebuild Qt against the version of gstreamer you install. Also some other apps on Linux may be dependent on the specific version of gstreamer as well. You may need to rebuild all of them.

                K 1 Reply Last reply
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                • JoeCFDJ JoeCFD

                  @Kimosabe good to know. Thanks. Install and try it out.
                  Try to get streamer source from
                  https://gitlab.freedesktop.org/gstreamer/gstreamer.git
                  I remember I had some issues when I downloaded the source from the link
                  https://gstreamer.freedesktop.org/src/gst-plugins-good/
                  to build it.

                  It can be very messy to upgrade gstreamer since you may have to rebuild Qt against the version of gstreamer you install. Also some other apps on Linux may be dependent on the specific version of gstreamer as well. You may need to rebuild all of them.

                  K Offline
                  K Offline
                  Kimosabe
                  wrote on last edited by
                  #13

                  @JoeCFD thanks for advice. Yes I am aware that updating gstreamer can break a lot of other things on Linux OS that are depending on gstreamer.
                  If you manage to stream camera image via QT using new gst-plugins-good please leave a comment, so I have information if it is worth of effort to implement it on my side.

                  JoeCFDJ 1 Reply Last reply
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                  • K Kimosabe

                    @JoeCFD thanks for advice. Yes I am aware that updating gstreamer can break a lot of other things on Linux OS that are depending on gstreamer.
                    If you manage to stream camera image via QT using new gst-plugins-good please leave a comment, so I have information if it is worth of effort to implement it on my side.

                    JoeCFDJ Offline
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                    JoeCFD
                    wrote on last edited by JoeCFD
                    #14

                    @Kimosabe I am building the latest gstreamer now because of delay and memory leak in RTSP streaming. I noticed there may be only one module QMultimediaGstTools and QMultimedia-plugins in Qt which need gstreamer. If you do not use them, simply ignore Qt rebuild. I could be wrong. But you may need to get the latest libva
                    https://github.com/intel/libva.git
                    to build with gstreamer. Build libva first and then gstreamer with the new streamer.

                    1 Reply Last reply
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                    • P Offline
                      P Offline
                      prettyQt
                      wrote on last edited by
                      #15

                      Hi I'm trying to get a custom gstreamer pipeline going.
                      I am building gstreamer 1.23 from source:

                      git clone https://gitlab.freedesktop.org/gstreamer/gstreamer.git
                      meson setup builddir
                      meson compile -C builddir
                      

                      Once this builds, how would I then point my .pro file at this?

                      For reference I am trying to build this example project.

                      The current .pro file looks like this:

                      TEMPLATE = app
                      
                      QT += qml quick widgets
                      
                      QT_CONFIG -= no-pkg-config
                      CONFIG += link_pkgconfig debug
                      PKGCONFIG = \
                          gstreamer-1.0 \
                          gstreamer-video-1.0
                      
                      DEFINES += GST_USE_UNSTABLE_API
                      
                      INCLUDEPATH += ../lib
                      
                      SOURCES += main.cpp
                      
                      RESOURCES += qmlsink.qrc
                      
                      # Additional import path used to resolve QML modules in Qt Creator's code model
                      QML_IMPORT_PATH =
                      

                      How would I modify this .pro file to point to my gstreamer build?

                      Currently the line

                      #include <gst/gst.h>
                      

                      in main.cpp references my system's gstreamer at /usr/include/gstreamer-1.0/gst/gst.h.

                      The line

                      import org.freedesktop.gstreamer.Qt6GLVideoItem 1.0
                      
                      

                      in main.qml throws an error.

                      JoeCFDJ 1 Reply Last reply
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                      • P prettyQt

                        Hi I'm trying to get a custom gstreamer pipeline going.
                        I am building gstreamer 1.23 from source:

                        git clone https://gitlab.freedesktop.org/gstreamer/gstreamer.git
                        meson setup builddir
                        meson compile -C builddir
                        

                        Once this builds, how would I then point my .pro file at this?

                        For reference I am trying to build this example project.

                        The current .pro file looks like this:

                        TEMPLATE = app
                        
                        QT += qml quick widgets
                        
                        QT_CONFIG -= no-pkg-config
                        CONFIG += link_pkgconfig debug
                        PKGCONFIG = \
                            gstreamer-1.0 \
                            gstreamer-video-1.0
                        
                        DEFINES += GST_USE_UNSTABLE_API
                        
                        INCLUDEPATH += ../lib
                        
                        SOURCES += main.cpp
                        
                        RESOURCES += qmlsink.qrc
                        
                        # Additional import path used to resolve QML modules in Qt Creator's code model
                        QML_IMPORT_PATH =
                        

                        How would I modify this .pro file to point to my gstreamer build?

                        Currently the line

                        #include <gst/gst.h>
                        

                        in main.cpp references my system's gstreamer at /usr/include/gstreamer-1.0/gst/gst.h.

                        The line

                        import org.freedesktop.gstreamer.Qt6GLVideoItem 1.0
                        
                        

                        in main.qml throws an error.

                        JoeCFDJ Offline
                        JoeCFDJ Offline
                        JoeCFD
                        wrote on last edited by JoeCFD
                        #16

                        @prettyQt
                        do not install it now. Otherwise, you will mess it up with the installed gstreamer version.
                        rm -rf builddir
                        meson setup -prefix=/opt/gstreamer builddir /* install it to a place which does not affect the installed one */
                        ninja -C builddir
                        sudo ninja install -C builddir

                        P 2 Replies Last reply
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                        • JoeCFDJ JoeCFD

                          @prettyQt
                          do not install it now. Otherwise, you will mess it up with the installed gstreamer version.
                          rm -rf builddir
                          meson setup -prefix=/opt/gstreamer builddir /* install it to a place which does not affect the installed one */
                          ninja -C builddir
                          sudo ninja install -C builddir

                          P Offline
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                          prettyQt
                          wrote on last edited by
                          #17

                          @JoeCFD thanks that makes sense. Once this is done, how would I then utilize this build in the Qt project?

                          JoeCFDJ 1 Reply Last reply
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                          • P prettyQt

                            @JoeCFD thanks that makes sense. Once this is done, how would I then utilize this build in the Qt project?

                            JoeCFDJ Offline
                            JoeCFDJ Offline
                            JoeCFD
                            wrote on last edited by JoeCFD
                            #18

                            @prettyQt
                            set the right path for compiling with the built gstreamer

                            export PKG_CONFIG_PATH=/opt/gstreamer/lib/pkgconfig/:/opt/gstreamer/share/pkgconfig:$PKG_CONFIG_PATH
                            

                            to test and run, the following is also needed

                            export PATH=/opt/gstreamer/bin:$PATH
                            export LD_LIBRARY_PATH=/opt/gstreamer/lib:$LD_LIBRARY_PATH
                            which gst-inspect-1.0 /* to check the right bin path */
                            ldd /opt/gstreamer/bin/gst-inspect-1.0 /* to check the right lib path */ 
                            

                            Not sure if you need to rebuild qmultimedia module with the new gstreamer version. Also the video driver may need to be rebuilt as well.

                            1 Reply Last reply
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                            • JoeCFDJ JoeCFD

                              @prettyQt
                              do not install it now. Otherwise, you will mess it up with the installed gstreamer version.
                              rm -rf builddir
                              meson setup -prefix=/opt/gstreamer builddir /* install it to a place which does not affect the installed one */
                              ninja -C builddir
                              sudo ninja install -C builddir

                              P Offline
                              P Offline
                              prettyQt
                              wrote on last edited by
                              #19

                              @JoeCFD I got an error when running

                              sudo ninja install -C builddir/
                              
                              ninja: Entering directory `builddir/'
                              [1/2] Installing files.
                              Traceback (most recent call last):
                                File "/home/robby/.local/bin/meson", line 5, in <module>
                                  from mesonbuild.mesonmain import main
                              ModuleNotFoundError: No module named 'mesonbuild'
                              FAILED: meson-internal__install 
                              /home/robby/.local/bin/meson install --no-rebuild
                              ninja: build stopped: subcommand failed.
                              
                              

                              Any ideas?

                              P 1 Reply Last reply
                              0
                              • P prettyQt

                                @JoeCFD I got an error when running

                                sudo ninja install -C builddir/
                                
                                ninja: Entering directory `builddir/'
                                [1/2] Installing files.
                                Traceback (most recent call last):
                                  File "/home/robby/.local/bin/meson", line 5, in <module>
                                    from mesonbuild.mesonmain import main
                                ModuleNotFoundError: No module named 'mesonbuild'
                                FAILED: meson-internal__install 
                                /home/robby/.local/bin/meson install --no-rebuild
                                ninja: build stopped: subcommand failed.
                                
                                

                                Any ideas?

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                                prettyQt
                                wrote on last edited by
                                #20

                                It looks like the version of meson sudo was using was wrong. It worked after I ran

                                sudo python3 -m pip install meson
                                

                                This post talks about it.

                                1 Reply Last reply
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                                • P Offline
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                                  prettyQt
                                  wrote on last edited by
                                  #21

                                  When running the example code, I get this error:

                                  0:00:00.205244082 71309 0x556ff36ea0d0 ERROR            qtglutility gstqt6glutility.cc:242:gst_qml6_get_gl_wrapcontext: cannot wrap qt OpenGL context
                                  

                                  Has anyone seen or solved this?

                                  1 Reply Last reply
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                                  • JoeCFDJ JoeCFD referenced this topic on

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