Build qt project on Raspberry Pi



  • Hello,

    I've created a project with QTCreator. I want to compile it on my Raspberry Pi.
    When I launch qmake function, I have this error :
    @Project ERROR: Unknown module(s) in QT: multimedia multimediawidgets@

    Does anyone know what I have to do ?

    Thanks !


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Did you build these two modules for the Raspberry Pi ?



  • I followed this guide : http://qt-project.org/wiki/Native_Build_of_Qt5_on_a_Raspberry_Pi

    Should I have to build something else ?

    [edit: corrected link SGaist]


  • Lifetime Qt Champion

    Did you call configure in qtbase ?



  • Yes I did..



  • When I try to build my project using command lines, I got the same problem on my ubuntu computer.

    Something seems different between QTCreator building and command line building.


  • Lifetime Qt Champion

    If you called in qtbase then you only have qtbase built. You need to build the other modules now



  • What do I have to do to build the other modules ?


  • Lifetime Qt Champion

    go into the submodule folder call the correct qmake (the one created from your qtbase build) then make and make install



  • When I call
    @which qmake@
    I got
    @/usr/bin/qmake@

    In the guide, they say that I have to got something like :
    @/usr/local/qt5/bin/qmake@

    What did I wrong ?

    In the guide, they say :
    @After this you need to add some lines to your .bashrc file:

    export LD_LIBRARY_PATH=/usr/local/qt5/lib/
    export PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/usr/local/qt5/bin
    

    @

    I have to type those 2 commands in my terminal or should I have to do something different ?

    Thanks a lot,



  • When I try to build qtmultimedia, I get this error :

    @In file included from examples/multimediawidgets/customvideosurface/customvideowidget/main.cpp:41:0:
    examples/multimediawidgets/customvideosurface/customvideowidget/videoplayer.h:44:24: fatal error: QMediaPlayer: No such file or directory
    compilation terminated.
    Makefile:103835: recipe for target '.obj/main.o' failed
    make: *** [.obj/main.o] Error 1@


  • Lifetime Qt Champion

    You did nothing wrong, you simply have installed the Qt development package from your distribution.

    Are you building the examples as part of the module build or just to test it ?



  • Sorry, but I don't understand your question..

    I tried to build an example like in the guide :
    @cp -r ~/opt/qt5/qtbase/examples/opengl/cube ~/
    cd ~/cube
    qmake
    make
    ./cube@

    And it works if I use @/usr/local/qt5/bin/qmake@.

    But for my project, it doesn't work.
    It's this example project : "http://doc.qt.io/qt-5/qtmultimediawidgets-camera-example.html":http://doc.qt.io/qt-5/qtmultimediawidgets-camera-example.html


  • Lifetime Qt Champion

    Did you build the Qt Multimedia module ?



  • I did this (I did it before, and the response are those I get now)

    @~/opt/qt5/qtmultimedia $ /usr/local/qt5/bin/qmake -project@
    @/usr/local/qt5/bin/qmake qtmultimedia.pro@



  • @make
    Makefile:7405: warning: overriding recipe for target '.moc/moc_videoplayer.cpp'
    Makefile:7175: warning: ignoring old recipe for target '.moc/moc_videoplayer.cpp'
    [...]
    Makefile:22911: warning: overriding recipe for target '.moc/moc_videowidget.cpp'
    Makefile:6999: warning: ignoring old recipe for target '.moc/moc_videowidget.cpp'
    Makefile:24555: warning: overriding recipe for target '.moc/moc_avfvideorenderercontrol.cpp'
    Makefile:24043: warning: ignoring old recipe for target '.moc/moc_avfvideorenderercontrol.cpp'
    Makefile:66871: warning: overriding recipe for target '.moc/video.moc'
    Makefile:66656: warning: ignoring old recipe for target '.moc/video.moc'
    Makefile:67707: warning: overriding recipe for target '.obj/main.o'
    Makefile:67704: warning: ignoring old recipe for target '.obj/main.o'
    [...]
    Makefile:78782: warning: overriding recipe for target '.obj/videoplayer.o'
    Makefile:78311: warning: ignoring old recipe for target '.obj/videoplayer.o'
    Makefile:100902: warning: overriding recipe for target '.obj/main.o'
    Makefile:78550: warning: ignoring old recipe for target '.obj/main.o'
    [...]
    Makefile:103595: warning: overriding recipe for target '.obj/videoplayer.o'
    Makefile:78782: warning: ignoring old recipe for target '.obj/videoplayer.o'
    Makefile:103830: warning: overriding recipe for target '.obj/main.o'
    Makefile:103243: warning: ignoring old recipe for target '.obj/main.o'
    Makefile:104011: warning: overriding recipe for target '.obj/videoplayer.o'
    Makefile:103595: warning: ignoring old recipe for target '.obj/videoplayer.o'
    Makefile:104166: warning: overriding recipe for target '.obj/videowidget.o'
    Makefile:77959: warning: ignoring old recipe for target '.obj/videowidget.o'
    Makefile:125330: warning: overriding recipe for target '.obj/wavheader.o'
    Makefile:124733: warning: ignoring old recipe for target '.obj/wavheader.o'
    Makefile:149987: warning: overriding recipe for target '.obj/audiorecorder.o'
    Makefile:76253: warning: ignoring old recipe for target '.obj/audiorecorder.o'
    Makefile:150178: warning: overriding recipe for target '.obj/camera.o'
    Makefile:77036: warning: ignoring old recipe for target '.obj/camera.o'
    Makefile:150527: warning: overriding recipe for target '.obj/qsound.o'
    Makefile:84816: warning: ignoring old recipe for target '.obj/qsound.o'
    Makefile:150867: warning: overriding recipe for target '.obj/camera.o'
    Makefile:150178: warning: ignoring old recipe for target '.obj/camera.o'
    Makefile:151081: warning: overriding recipe for target '.obj/video.o'
    Makefile:150744: warning: ignoring old recipe for target '.obj/video.o'
    /usr/bin/g++ -c -pipe -marm -mfpu=vfp -mtune=arm1176jzf-s -march=armv6zk -mabi=aapcs-linux -mfloat-abi=hard -O2 -fno-exceptions -Wall -W -D_REENTRANT -fPIE -DQT_NO_MTDEV -DQT_NO_XKB -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I. -I. -Isrc/multimedia/gsttools_headers -Isrc/multimedia/video -Isrc/multimedia/controls -Isrc/multimedia/audio -Isrc/multimedia/camera -Isrc/multimediawidgets -Isrc/multimedia -Isrc/multimedia/playback -Isrc/multimedia/qtmultimediaquicktools_headers -Isrc/qtmultimediaquicktools -Iexamples/multimedia/audiodecoder -Iexamples/multimedia/audiodevices -Iexamples/multimedia/audioinput -Iexamples/multimedia/audiooutput -Iexamples/multimedia/audiorecorder -Iexamples/multimedia/radio -Iexamples/multimediawidgets/camera -Iexamples/multimediawidgets/player -Iexamples/multimediawidgets/videographicsitem -Isrc/imports/audioengine -Isrc/imports/multimedia -Isrc/multimedia/radio -Isrc/multimedia/recording -Isrc/plugins/alsa -Isrc/plugins/audiocapture -Isrc/plugins/directshow -Isrc/plugins/directshow/camera -Isrc/plugins/directshow/player -Isrc/plugins/m3u -Isrc/plugins/opensles -Isrc/plugins/pulseaudio -Isrc/plugins/qnx -Isrc/plugins/qnx/camera -Isrc/plugins/qnx/mediaplayer -Isrc/plugins/resourcepolicy -Isrc/plugins/v4l -Isrc/plugins/v4l/radio -Isrc/plugins/windowsaudio -Isrc/plugins/winrt -Isrc/plugins/wmf -Isrc/plugins/wmf/player -Isrc/plugins/wmf/decoder -Iexamples/multimedia/spectrum/app -Iexamples/multimedia/spectrum/3rdparty/fftreal -Iexamples/multimedia/video/qmlvideo -Iexamples/multimedia/video/snippets/performancemonitor -Iexamples/multimedia/video/qmlvideofx -Iexamples/multimediawidgets/customvideosurface/customvideoitem -Iexamples/multimediawidgets/customvideosurface/customvideowidget -Isrc/plugins/android/src -Isrc/plugins/android/src/mediaplayer -Isrc/plugins/android/src/mediacapture -Isrc/plugins/android/src/wrappers/jni -Isrc/plugins/android/videonode -Isrc/plugins/gstreamer/audiodecoder -Isrc/plugins/gstreamer/camerabin -Isrc/plugins/gstreamer/mediacapture -Isrc/plugins/gstreamer/mediaplayer -Isrc/plugins/qnx/common -Isrc/plugins/qnx-audio/audio -Isrc/plugins/videonode/egl -Isrc/plugins/videonode/imx6 -Itests/auto/integration/qaudioinput -Itests/auto/unit/qmultimedia_common -Iexamples/multimedia/spectrum/3rdparty/fftreal/stopwatch -Iexamples/multimedia/video/qmlvideofx/qmlapplicationviewer -Iexamples/multimedia/video/snippets/frequencymonitor -Isrc/plugins/android/src/common -Itests/auto/unit/qmediaserviceprovider -I/home/pi/opt/qt5/qtbase/include -I/home/pi/opt/qt5/qtbase/include/QtGui -I/home/pi/opt/qt5/qtbase/include/QtCore -I.moc -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux -I/usr/local/qt5/mkspecs/devices/linux-rasp-pi-g++ -o .obj/main.o examples/multimediawidgets/customvideosurface/customvideowidget/main.cpp
    In file included from examples/multimediawidgets/customvideosurface/customvideowidget/main.cpp:41:0:
    examples/multimediawidgets/customvideosurface/customvideowidget/videoplayer.h:44:24: fatal error: QMediaPlayer: No such file or directory
    compilation terminated.
    Makefile:103835: recipe for target '.obj/main.o' failed
    make: *** [.obj/main.o] Error 1@


  • Lifetime Qt Champion

    Did you call make install after you built the module ?



  • Yes I did, same output...


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