My QGraphicsProxyWidget is not working, tested QWidget is

[houmingc]

Before removing comment when QGraphicsProxyWidget is created to view show(). this app is working.
When this comment is removed & window assignment(setLayout, resize, show) commented, this app is no longer working( no longer showing 2 video side by side)
Did i use QGraphicsProxyWidget correctly, i thought i did? Can someone comment on my error.

@
extern QStringList xmlID;
extern QStringList xmlName;
extern QStringList xmlValue;

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//
QGraphicsScene scene;

ml = new WidgetMarqueeLabel(this);
ml->setDirection(1);
ml->setSpeed(1);
ml->setAlignment(Qt::AlignBottom);
ml->setText(QString("%1").arg(xmlValue[2]));
ml->setFont(QFont("Arial", 15,30));
QGridLayout *layout= new QGridLayout;
video();

layout->addWidget(videoWidget,0,0);
layout->addWidget(videoWidget1,0,1);
layout->addWidget(ml,1,0,1,2);
layout->setColumnStretch(0,10);
layout->setColumnStretch(1,10);



QWidget *window= new QWidget;
window->setLayout(layout);

// QGraphicsProxyWidget* proxy = scene.addWidget(window);

// QGraphicsView view(&scene);
// view.setWindowTitle("QWidget");
// view.setFixedSize(800,900);
// view.show();

   window->setLayout(layout);
   window->resize(1500,400);
   window->show();

}

//create new mediaplaylist, mediaplayer, Videowidget, playlist
void MainWindow::video()
{
QString RealVideo1=xmlValue[0];
playlist= new QMediaPlaylist();
player= new QMediaPlayer;
videoWidget = new QVideoWidget;
playlist->addMedia(QUrl::fromLocalFile("/opt/night.mp4"));
playlist->addMedia(QUrl::fromLocalFile("/opt/V7.mp4"));
playlist->addMedia(QUrl::fromLocalFile("/opt/hotgirl.mp4"));
playlist->addMedia(QUrl::fromLocalFile("/opt/bird.mp4"));
playlist->addMedia(QUrl::fromLocalFile("/opt/arrow.mp4"));

playlist->setPlaybackMode(QMediaPlaylist::Loop);
playlist->setCurrentIndex(1);

player->setPlaylist(playlist);
player->setVolume(100);


QString RealVideo2=xmlValue[1];
playlist1= new QMediaPlaylist();
playlist1->setPlaybackMode(QMediaPlaylist::Loop);
player1= new QMediaPlayer;
videoWidget1 = new QVideoWidget;
playlist1->addMedia(QUrl::fromLocalFile("/opt/abc.mp4"));
player1->setPlaylist(playlist1);
player1->setVolume(0);


player->setVideoOutput(videoWidget);
player1->setVideoOutput(videoWidget1);
playlist->setCurrentIndex(1);
playlist1->setCurrentIndex(1);
player->play();
player1->play();

}

MainWindow::~MainWindow()
{
delete ui;
}

@

[alex_malyu]

You are adding a few local variables in in MainWindow::MainWindow(QWidget *parent) {}
which disappear as soon they go out of scope. and this happens way before your main window is shown.
This includes QGraphicsScene scene; and QGraphicsView view(&scene);
I bet it is not what you wanted.

Instead you probably wanted put members to your MainWindow, so add QGraphicsScene scene; QGraphicsView view; to header file
and just initialize them in constructor before anything else.

[houmingc]

After initializing them in constructor, the scene appears, video music is playing but
video is not.

@ header file
QGraphicsProxyWidget* proxy;
QGraphicsScene* scene;
QGraphicsView* view;
@

@
ui->setupUi(this);
scene = new QGraphicsScene(this);

ml = new WidgetMarqueeLabel(this);
ml->setDirection(1);
ml->setSpeed(1);
ml->setAlignment(Qt::AlignBottom);
ml->setText(QString("%1").arg(xmlValue[2]));
ml->setFont(QFont("Arial", 15,30));
QGridLayout *layout= new QGridLayout;
video();
layout->addWidget(videoWidget,0,0);
layout->addWidget(videoWidget1,0,1);
layout->addWidget(ml,1,0,1,2);
layout->setColumnStretch(0,10);
layout->setColumnStretch(1,10);

QWidget *window= new QWidget;
window->setLayout(layout);
proxy= scene->addWidget(window);
view = new QGraphicsView(scene);
view->setFixedSize(800,900);
view->show();

@