Problem with QMediaPlayer and QAudioProbe

[mohabb]

Thanks for reading my post .

I am developing a small project to process audio. The program allows both read an .mp3 file or record sound from the microphone .

While playing or recording shows the user the energy of the signal and the spectrum.
When I want to record sound I use QAudioRecorder and everything works properly. The problem is that if I want to read an .mp3 file does not work.I have a problem connecting QMediaPlayer and QAudioProbe.

mediaPlayer=new QMediaPlayer(this);
    audioProbe = new QAudioProbe(this);
 
    if (audioProbe->setSource(mediaPlayer)) {
        // Probing succeeded, audioProbe->isValid() should be true.
        connect(audioProbe, SIGNAL(audioBufferProbed(QAudioBuffer)),
                this, SLOT(calculateLevel(QAudioBuffer)));
        cout << "All work correctly" << endl;
    }else{
        cout << "Some problems" << endl;
    }
    mediaPlayer->setMedia(fileSelected);
    mediaPlayer->setVolume(50);
    mediaPlayer->play();

mediaPlayer=new QMediaPlayer(this);
    audioProbe = new QAudioProbe(this);

    if (audioProbe->setSource(mediaPlayer)) {
        // Probing succeeded, audioProbe->isValid() should be true.
        connect(audioProbe, SIGNAL(audioBufferProbed(QAudioBuffer)),
                this, SLOT(calculateLevel(QAudioBuffer)));
        cout << "All work correctly" << endl;
    }else{
        cout << "Some problems" << endl;
    }
    mediaPlayer->setMedia(fileSelected);
    mediaPlayer->setVolume(50);
    mediaPlayer->play();

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The sound is played correctly but I fail to connect with QAudioProbe . How I can connect it? Thanks.