Fitting QGraphicsVideoItem and QGraphicsScene to QGraphicsView

R_Irudezu

Hi, I'm trying to play video on UI like that:

in mainwindow.cpp:

QGraphicsScene *scene = new QGraphicsScene(this);

// drag&dropped QGraphicsView on the UI named graphic_view
ui->graphic_view->setScene(scene);

QGraphicsVideoItem *video_item = new QGraphicsVideoItem();
scene->addItem(video_item);

QMediaPlayer *media_player = new QMediaPlayer(this);
media_player ->setVideoOutput(video_item );
media_player ->setMedia(QUrl("path-to-video"));
media_player ->play();

Video is playing but i couldn't fit video to its parent. Any suggestions or sample to how to do that in my case?

A gif is here:

R_Irudezu

@Asperamanca I tried to use but now with a resizeEvent, today i woke up and get on pc then just tried with resizeEvent. So everything ok now :)

Here is how i did:

//in constructor
QGraphicsScene *scene = new QGraphicsScene(this);
scene ->setSceneRect(10,10,500,350);
ui->graphicsView_2->setScene(scene);
ui->graphicsView_2->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->graphicsView_2->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->graphicsView_2->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

QGraphicsVideoItem *vi = new QGraphicsVideoItem();
player = new QMediaPlayer(this);
player ->setVideoOutput(vi);
player ->setMedia(QUrl("some rtsp address or local video source path"));
player ->play();


//resize event, you should declare in header protected section
void MainWindow::resizeEvent(QResizeEvent *)
{
    QRectF testRect = scene->itemsBoundingRect();

    // if i don't multiply with between 0.9 and 0.95 some white spaces raises on the right and bottom
    testRect.setWidth(testRect.width()*0.95);
    testRect.setHeight(testRect.height()*0.95);
    ui->graphicsView_2->fitInView(testRect, Qt::IgnoreAspectRatio);
    ui->graphicsView_2->centerOn(0,0);

    ui->graphicsView->raise(); //if mainwindow has a layout(grid or some otherelse)
    // graphicsView is an another layer that i want to paint on second graphicView layer.

    QSize test(ui->graphicsView_2->size());
    qDebug() << "grapView2 Sze: " << test;
}

Video source is playing and it fits itself to entire QGraphicsView, just like i want.

Thanks for any help and suggestions.

SGaist

Hi,

Before diving into that, are you showing any else on that QGraphicsView ? If not, why not use QVideoWidget ?

R_Irudezu

@SGaist I'm trying to draw other qraphicView objects on it, i tried to use QVideoWidget but it's invalidate the transparent layer(to see topic:).

So i think i need to use other option to show video: QGraphicsView, QGraphicsScene and QGraphicsVideoItem together. I tested to draw another qgraphicsView on it, it keeps its transparent background, so i think i need to do this way to what i am trying to do.

R_Irudezu

any possibility?

SGaist

IIRC, videos might be shown on a layer above the widgets therefore drawing on top of it might be more complicated. Did you consider using QtQuick ? It could prove simpler for your use case.

R_Irudezu

@SGaist

As you see, i can play an animated QGraphicsScene on a rtsp video like that, the problem is, i can not fit the video into entire parent widget. First message shows how i play rtsp video Mr. @SGaist

R_Irudezu

I'm trying to make a lot of these types examples to achieve and learn Qt's skill. Even what i'm trying to do is wrong i am learning how to fix it and what is the most efficient way. So i want to thank this forum for all replies and helps. The next step is solving this problem, i tried all sizing tricks but never overcome :/

Asperamanca

Have you tried QGraphicsView::fitInView?

R_Irudezu

@Asperamanca I tried to use but now with a resizeEvent, today i woke up and get on pc then just tried with resizeEvent. So everything ok now :)

Here is how i did:

//in constructor
QGraphicsScene *scene = new QGraphicsScene(this);
scene ->setSceneRect(10,10,500,350);
ui->graphicsView_2->setScene(scene);
ui->graphicsView_2->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->graphicsView_2->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->graphicsView_2->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

QGraphicsVideoItem *vi = new QGraphicsVideoItem();
player = new QMediaPlayer(this);
player ->setVideoOutput(vi);
player ->setMedia(QUrl("some rtsp address or local video source path"));
player ->play();


//resize event, you should declare in header protected section
void MainWindow::resizeEvent(QResizeEvent *)
{
    QRectF testRect = scene->itemsBoundingRect();

    // if i don't multiply with between 0.9 and 0.95 some white spaces raises on the right and bottom
    testRect.setWidth(testRect.width()*0.95);
    testRect.setHeight(testRect.height()*0.95);
    ui->graphicsView_2->fitInView(testRect, Qt::IgnoreAspectRatio);
    ui->graphicsView_2->centerOn(0,0);

    ui->graphicsView->raise(); //if mainwindow has a layout(grid or some otherelse)
    // graphicsView is an another layer that i want to paint on second graphicView layer.

    QSize test(ui->graphicsView_2->size());
    qDebug() << "grapView2 Sze: " << test;
}

Video source is playing and it fits itself to entire QGraphicsView, just like i want.

Thanks for any help and suggestions.