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

[kDohmen]

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.

[SGaist]

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.

[kDohmen]

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)

[SGaist]

Why do you need to mix plugin versions ?

[kDohmen]

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.

[SGaist]

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