QAudioDecoder - defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.audiodecode"



  • Hello,

    I want to use QAudioDecoder (Debian 7).

    My testcode:
    .h

        QAudioDecoder decoder_;
    

    .cpp

        QAudioFormat format;
        format.setByteOrder(QAudioFormat::BigEndian);
        format.setChannelCount(2);
        format.setCodec("audio/x-raw");
        format.setSampleRate(44800);
        format.setSampleSize(16);
        format.setSampleType(QAudioFormat::UnSignedInt);
    
        decoder_.setAudioFormat(format);
        decoder_.setSourceFilename("/home/psy-kai/Downloads/tpimd.mp3");
        decoder_.start();
    

    But it just outputs:
    defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.audiodecode"

    So I compiled qmultimedia with openal, alsa, pulseaudio and gstreamer successfully from sources.
    My way to compile qmultimedia:
    1.) Downloading ALL missing dev-packages (for openal, alsa, pulseaudio, gstreamer and v4l)
    2.) cd qtmultimedia
    3.) qmake
    output:

    Checking for openal... yes
    Checking for alsa... yes
    Checking for pulseaudio... yes
    Checking for gstreamer... yes
    Checking for gstreamer_photography... yes
    Checking for gstreamer_encodingprofiles... yes
    Checking for gstreamer_appsrc... yes
    Checking for linux_v4l... yes
    Checking for resourcepolicy... no
    Checking for gpu_vivante... no
    

    4.) make

    Then I copied all from the newly created lib-directory to my main qt lib-directory. But when I run my application it just outputs the same error again.


  • Lifetime Qt Champion

    Hi,

    You should start your application with the QT_DEBUG_PLUGINS environment variable set to 1, you should then see what happens when you application tries to load its plugins.



  • ok, I did not know that with QMultimedia real Qt-plugins (ref: like http://qt-project.org/doc/qt-5/plugins-howto.html or http://qt-project.org/doc/qt-5/deployment-plugins.html if i am right) are used.
    So now I gonna need to recompile qtmultimedia for version 5.0 (need the plugins for version 5.0, i have 5.3.2). Is there a difference for Qt between 5.0 and 5.0.2? In the 5.0 version the MODULE_VERSION misses in qmake.conf and when I add it the compiler complain about a missing source-file... (same when I use the source from 5.3.2 and change MODULE_VERSION to 5.0.0)


  • Lifetime Qt Champion

    Why do you need to mix plugin versions ?



  • Now I have installed Qt 5.3.2. But I write a plugin (no qt-plugin, just a normal C++ library) for an application which is using and shipped with Qt 5.0(.?).

    *I did not know which Qt5 version was used by the main application, I just knew it was Qt5.


  • Lifetime Qt Champion

    Then you should rather work with the same version of Qt than the one that is shipped with the application


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