QMediaPlayer : media stays in UnknownMediaStatus - qt

Question

I created a QMediaPlayer, passed video address to it and it won't play. I checked the mediaStatus and player state, they all stays 0 all the time. The basic idea is:
QMediaPlayer player = new QMediaPlayer();
cout << player.mediaStatus(); // should print 1: NoMedia but is 0: UnknownMediaStatus
player.setVideoOutput(some_constructed_video_widget);
cout << player.mediaStatus(); // should print 1: NoMedia but is 0: UnknownMediaStatus
player.setMedia(QUrl::fromLocalFile("path/to/test/video/test.mp4"));
cout << player.mediaStatus(); // should print 2: LoadingMedia but is 0: UnknownMediaStatus
player.play();
cout << player.mediaStatus(); // should print 3: LoadedMedia but is 0: UnknownMediaStatus
// and of course, no video gets played
The mediaStatus is simply a enum: MediaStatus { UnknownMediaStatus, NoMedia, LoadingMedia, LoadedMedia, ..., InvalidMedia }
The questions are:
What may be causing this problem and how to fix that?
What are all the cases that a QMediaPlayer::mediaStatus() will return an QMediaPlayer::UnknownMediaStatus (please be conclusive)?
Edit with more information: The following is the output I get for the following code. Anyone has any idea what the error message means and how to fix that?
code:
int main(int argc, char *argv[])
{
QMediaPlayer * temp = new QMediaPlayer(0, QMediaPlayer::VideoSurface);
std::cout << "Constructed: " << temp->mediaStatus() << std::endl;
temp->setMedia(QUrl::fromLocalFile("path/to/video/test.mp4"));
std::cout << "SetMedia: " << temp->mediaStatus() << std::endl;
temp->play();
std::cout << "Play: " << temp->mediaStatus() << std::endl;
-> debug breakpoint here
......
}
output:
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"
Constructed: 0
SetMedia: 0
Play: 0
I am using Mac 10.9 and Qt 5.3.0, but I do not think the mac/qt version matters for this problem.