QVideoWidget can't show video in QGraphicsView in qt4.7.0 tp

Hi everyone, recently qt 4.7.0 tp has released and it intrtroduces a lot of new stuff. One thing i'm really exited about is that Qt now supports video playback natively by QMultimedia Module.

However, when i embed a QVideoWidget which connects to a QMediaPlayer into QGraphicsScene, the video just do not show up in the QGraphicsView while i do can hear the sound in the video?

Does anyone have a solution? Thanks a lot :)

the following is a part of my code:

Code:

---

class MovieInfoViewer : public QMainWindow
{
    Q_OBJECT
 
public:
    MovieInfoViewer(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~MovieInfoViewer();
 
private:
    Ui::MovieInfoViewerClass ui;
 
    QGraphicsScene* pMainScene;
    QVideoWidget* pBackGroundVideoWidget;
    QMediaPlayer* pBackGroundVideoPlayer;
};

---

Code:

---

MovieInfoViewer::MovieInfoViewer(QWidget *parent, Qt::WFlags flags)
    : QMainWindow(parent, flags)
{
    ui.setupUi(this);
 
    pMainScene=new QGraphicsScene();
    pBackGroundVideoWidget=new QVideoWidget();
    pBackGroundVideoPlayer=new QMediaPlayer();
 
    pBackGroundVideoWidget->setMediaObject(pBackGroundVideoPlayer);
 
    pBackGroundVideoPlayer->setMedia(QUrl::fromLocalFile("bTest.wmv"));
    pBackGroundVideoPlayer->setVolume(100);
    pBackGroundVideoPlayer->play();
 
    pMainScene->addWidget(pBackGroundVideoWidget);
 
    ui.mainView->setScene(pMainScene);
    ui.mainView->show();
}

---