No. I found no errors. If I use this line mediaObject->setCurrentSource(Phonon::MediaSource(":new/images/images/cow.mp3")) it doesn't work if I use this mediaObject->setCurrentSource(Phonon::MediaSource("/home/grizos/NokiaQtSDK/Projects/Babytoy/music/cow.mp3")); It works ok.!!!! Very strange!! ??