Window 下 Qt5 使用QMediaplayer 进行视频播放 流播放问题

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

QWidget *widget = new QWidget;
widget->resize(400, 300);   //

QVBoxLayout *layout = new QVBoxLayout;
QMediaPlayer* player = new QMediaPlayer;
QVideoWidget* vw = new QVideoWidget;

layout->addWidget(vw);
widget->setLayout(layout);

player->setVideoOutput(vw);

QFile file("123.mp4");
if(!file.open(QIODevice::ReadOnly))
qDebug() << "Could not open file";

player->setMedia(QUrl::fromLocalFile("123.mp4"));
player->play();
widget->show();

return a.exec();
}