Hi,

QMediaPlayer::setMedia() is an asynchronous operation. The media is not done 
loading when you call mediaPlayer->metaData().
You need to listen to the metaDataAvailableChanged() signal to be notified 
whenever the metadata is available.
See 
http://qt-project.org/doc/qt-5.0/qtmultimedia/qmediaobject.html#metaDataAvailableChanged

Yoann Lopes
Senior Software Engineer - Digia, Qt
Visit us on: http://qt.digia.com

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