Hello, $username!

I'm using Phonon::videoPlayer from Windows+Qt 4.6 in my music player project as core of it.

The bug is that some mp3-files cannot be opened and Phonon::videoPlayerInstance->mediaObject()->errorString() is:
the operation cannot be performed because the pins are not connected ($80040209)
I tried to pick out the plot of error-generating code, so its something like this:
Qt Code: 
  1. Tester::Tester(QApplication *starter = 0)
  2. {
  3.     this->starter = starter;
  4.  
  5.     core.mediaObject()->setTickInterval(1000);
  6.     sources.clear();
  7.  
  8.     connect(core.mediaObject(), SIGNAL(stateChanged(Phonon::State, Phonon::State)),
  9.             this, SLOT(stateChanged(Phonon::State, Phonon::State)));
  10.  
  11.     QStringList list = QFileDialog::getOpenFileNames(0,"Phonon Test",".",tr("audios (*.mp3 *.wma *.ogg *.wave *.midi)"));
  12.  
  13.     for (int i = 0; i < list.size(); i++){
  14.         Phonon::MediaSource source(list.at(i));
  15.         sources.insert(i,source);
  16.     }
  17.     core.mediaObject()->setCurrentSource(sources.at(0));
  18.  
  19.     core.play();
  20. }
  21.  
  22. void Tester::stateChanged(Phonon::State newstate, Phonon::State oldstate)
  23. {
  24.     if (newstate == Phonon::ErrorState) {
  25.             QMessageBox::warning(0, "Phonon Mediaplayer",
  26.                                  core.mediaObject()->errorString(),
  27.                                  QMessageBox::Close);
  28.             if (core.mediaObject()->errorType() == Phonon::FatalError) {
  29.                 starter->exit();
  30.             } else {
  31.                 core.mediaObject()->stop();
  32.             }
  33.      }
  34. }
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As you see, its just clean code with no extraordinary using of Qt.

Anybody knows, is it problem of Windows sound libraries or something else?