QVideoWidget not showing after minimizing

#include <QApplication>
#include <QAudioOutput>
#include <QMediaPlayer>
#include <QTimer>
#include <QVideoWidget>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QVideoWidget w;
    w.resize(640, 480);
    w.show();

    QMediaPlayer player;
    QAudioOutput audioOutput;
    player.setAudioOutput(&audioOutput);
    player.setVideoOutput(&w);
    player.setSource(QUrl("http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"));
    player.play();

    QTimer::singleShot(3000, &w, &QVideoWidget::showMinimized);
    QTimer::singleShot(6000, &w, &QVideoWidget::showNormal);

    return a.exec();
}