ui->graphicsView Error: "Internal data stream error."

i use graphicsView to get video stream that codes work fine but when i use tab widget or stacked widget when i click another tab i take Error: "Internal data stream error."...

if i used qvideowidget i never take an error everything works fine!!! but i dont want to use videowidget!!

i hope u will understand my english

whats the problem for graphicView??

Code:

QMediaPlayer *player1 = new QMediaPlayer;
    QGraphicsVideoItem *item = new QGraphicsVideoItem;
    QGraphicsScene *scene = new QGraphicsScene(this);
 
    QSizeF size(280,160);
    item->setSize(size);
 
    ui->graphicsView->setScene(scene);
 
    scene->addItem(item);
 
    const QUrl url1 =QUrl("http://xxx.xx.x.xx:80/mjpg/video.mjpg");
    const QNetworkRequest requsetRstp1(url1);
 
    player1->setMedia(requsetRstp1);
    player1->setVideoOutput(item);
    player1->play();

AND THIS IS THE WORKING CODE BUT I DONT WANT TO USE

Code:

QVideoWidget *vw1 = new QVideoWidget;
    QMediaPlayer *player1 = new QMediaPlayer;
 
 
    ui->gridLayout->addWidget(vw1,0,0);
    player1->setVideoOutput(vw1);
 
    const QUrl url1 =QUrl("http://XX.XXX.XX.XX:8084/mjpg/video.mjpg");
    const QNetworkRequest requsetRstp1(url1);
    player1->setMedia(requsetRstp1);
    player1->play();