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Help with QtGStreamer undefined reference to QGST::init

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qtgstreamer
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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #6

    Recheck your pro file: do you have any line line QT = or INCLUDEPATH = ? Note the missing +

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    • J Offline
      J Offline
      JackCWallace
      wrote on last edited by
      #7

      No, this is my code:

      # This is a qmake project file, provided as an example on how to use qmake with QtGStreamer.
      
      TEMPLATE = app
      TARGET = player
      
      # produce nice compilation output
      CONFIG += silent
      
      # Tell qmake to use pkg-config to find QtGStreamer.
      CONFIG += pkgconfig
      
      # Now tell qmake to link to QtGStreamer and also use its include path and Cflags.
      contains(QT_VERSION, ^4\\..*) {
          PKGCONFIG += QtGStreamer-1.0 QtGStreamerUi-1.0
      }
      contains(QT_VERSION, ^5\\..*) {
          PKGCONFIG += Qt5GStreamer-1.0 Qt5GStreamerUi-1.0
      }
      
      QT += core quick widgets
      CONFIG += qt console bootstrap
      
      # Recommended if you are using g++ 4.5 or later. Must be removed for other compilers.
      #QMAKE_CXXFLAGS += -std=c++0x
      
      # Recommended, to avoid possible issues with the "emit" keyword
      # You can otherwise also define QT_NO_EMIT, but notice that this is not a documented Qt macro.
      DEFINES += QT_NO_KEYWORDS
      
      # Input
      HEADERS += mediaapp.h player.h
      SOURCES += main.cpp mediaapp.cpp player.cpp
      
      INCLUDEPATH += C:\qt-gstreamer-1.2.0\src
      

      Line 3 and 4 (TEMPLATE and TARGET) made no difference when I added a '+' before the '='

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #8

        TEMPLATE and TARGET should be used with = . They contain only one value.

        Do you still have that error if you don't use pkgconfig ?

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        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        J 1 Reply Last reply
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        • SGaistS SGaist

          TEMPLATE and TARGET should be used with = . They contain only one value.

          Do you still have that error if you don't use pkgconfig ?

          J Offline
          J Offline
          JackCWallace
          wrote on last edited by
          #9

          @SGaist Yes, If I take out the line for PKGCONFIG, I still get the same error

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #10

            Then create a default widget project and see if you can built it

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            J 1 Reply Last reply
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            • SGaistS SGaist

              Then create a default widget project and see if you can built it

              J Offline
              J Offline
              JackCWallace
              wrote on last edited by
              #11

              @SGaist Hi, I built an blank widget project, and I build one of the examples from Qt, and it worked fine

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #12

                Then keep that one and introduce one by one the elements of your other project until it either fails to build or build successfully

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                • J Offline
                  J Offline
                  JackCWallace
                  wrote on last edited by
                  #13

                  For every element in the pro file, it does not fail if I put '#include <QGst/Init>' then I get the error 'QtCore/QtGlobal: No such file or directory' Then if I comment it back out, and run qmake, then build, I get no error. If I comment it out I get the error 'cannot find boost/config.hpp' until I run qmake again.

                  I added 'C:\boost_1_58_0' to the include path, commented out '#include <QGst/Init>' ran qmake, and uncommented it, and it built with no error. Then I ran qmake again, and it game me the 'QtCore/QtGlobal' error again

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #14

                    Ok… Then the silly question: do you have a QtGlobal file ? If so where is it ?

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                    • J Offline
                      J Offline
                      JackCWallace
                      wrote on last edited by
                      #15

                      Yes, I have 5 copies, they are in
                      "C:\Qt\Qt5.4.1\5.4\android_armv5\include\QtCore\QtGlobal"
                      "C:\Qt\Qt5.4.1\5.4\android_armv7\include\QtCore\QtGlobal"
                      "C:\Qt\Qt5.4.1\5.4\android_x86\include\QtCore\QtGlobal"
                      "C:\Qt\Qt5.4.1\5.4\mingw491_32\include\QtCore\QtGlobal"
                      "C:\Qt\Qt5.4.1\5.4\Src\qtbase\include\QtCore\QtGlobal"

                      Should I have a different one somewhere else? I am building with Mingw

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #16

                        Did you modify your kits ?

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                        • J Offline
                          J Offline
                          JackCWallace
                          wrote on last edited by
                          #17

                          No, I even just got done uninstalling and reinstalling Qt 5.4.1 and QtCreator 3.3.2 and I just got the same QtCore error

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                          • J Offline
                            J Offline
                            JackCWallace
                            wrote on last edited by
                            #18

                            I then added the pkgconfig and config then instead of '#include <QGst/Init>' I did '#include <QGst/init.h>' and I got back to the error of undefined reference to 'QGst::init

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #19

                              Check the output of pkg-config for QtGStreamer, compare it to the build output of your application. Check the -I lines to see if something is currently modifying them in the wrong way

                              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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