QAudioDecoder - no service found - c++

Question

I am trying to decode a .wav file using QAudioDecoder class. Even though I had included the QtMultimedia module into my .pro file by adding
QT += multimedia I am receiving an error that service for the QAudioDecoder was not found. I am not able to see where to problem lies.
I am using Qt 5.1.0 with MingGW 4.8 32 bit on Windows 7.
Error message:
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.audiodecode"
.pro file:
QT += core
QT += multimedia
QT -= gui
TARGET = test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
main file:
#include <QCoreApplication>
#include <QAudioDecoder>
#include <QAudioBuffer>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QString pathToFile = "C:/Users/Mateusz/Documents/Szkola/Sound Processing/Lab1/artificial/easy/506Hz.wav";
QAudioDecoder decoder;
decoder.setSourceFilename(pathToFile);
decoder.start();
while(decoder.bufferAvailable()) {
QAudioBuffer buffer = decoder.read();
qDebug() << "Buffer size: " << buffer.byteCount();
}
return a.exec();
}

Answer 1

The Multimedia module uses plugins that are different on each platform (or compiler).
See http://qt-project.org/wiki/Qt_Multimedia_Backends
On Windows you have DirectShow and MediaFoundation (WMF).
Only the WMF plugin implements audio decoding features.
WMF plugin is only available with MSVC compiler.
See http://qt-project.org/doc/qt-5.1/qtmultimedia/platform-notes-windows.html

Answer 2

I had the same problem in Qt5.5 running under Linux.
The problem disappeared after upgrade to Qt5.5.1 using their MaintenanceTool.

Answer 3

I also struggled with this issue and finally got it to work by using the MS visual studio compiler in QT Creator, like Fernando Pelliccioni suggested.
Steps were:
-Use the Qt MaintenanceTool to add support for msvc2013
-Install Visual Studio 2013
-In Qt Creator go to Projects->Manage Kits and add msvc2013
-Build and run. Now QAudioDecoder works.