[QT5] QtMultimedia | i can`t get metadata

Hi :)
I try to get the meta data of music file (i try different files and udio formats mp3 wav etc) all files are good becaouse other players shows meta data :C
I try it on different ways but no one method work :/
my code:

Code:

---

testPlayer = new QMediaPlayer;
    playList = new QMediaPlaylist;
 
    testPlayer->setVolume(50);
// testPlayer->setMedia(QUrl::fromLocalFile("test2.mp3")); // try without playlist -> dont work :C
    playList->addMedia(QUrl::fromLocalFile("test2.mp3"));
    testPlayer->setPlaylist(playList);
    playList->setCurrentIndex(0);
    qDebug() << "Test: " << testPlayer->metaData(QMediaMetaData::Title);
 
    connect(testPlayer, SIGNAL(metaDataChanged()), this, SLOT(stc()));
 
    stc();

---

Code:

---

void MainWindow::stc()
{
    qDebug() << testPlayer->isMetaDataAvailable();
    if(testPlayer->isMetaDataAvailable())
    {
        qDebug() << testPlayer->metaData(QMediaMetaData::Duration);
    }
}

---

and i always get result data

Quote:

---

Test: QVariant(Invalid)
false
false
false
false

---

what i do wrong :C ?
please help :(