Slow Performance of QMediaPlayer with QGraphicsView/QGraphicsVideoItem/QGraphicsScene

[tmason202]

Hello,

So, I am trying to build a video player which a nice interface.

What I have been able to successfully do so far is getting QMediaPlayer to display the video on a QGraphicsVideoItem with transparent controls on top of it. The result looks pretty nice with gthe following exceptions:

• The resultant output is displayed but with just the "blue channel" shown; it's like instead of greyscale it's "blue scale".
• The performance of the video is very slow; the resultant player takes up 50% and more of CPU power and the video is very choppy.

What can I do to increase the performance of the player while also keeping the transparent widgets?

Also, what can I do to correct the color output?

Thank you.

Here is my "prepareUI()" function that is called in my main window's constructor:

void QTVideoPlayer::prepareUI(QUrl initialURL) {

	MainGraphicsView = new QGraphicsView();
	MainGraphicsView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	MainGraphicsView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	MainGraphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
	this->setCentralWidget(MainGraphicsView);

	MainGraphicsPlayerArea = new QGraphicsVideoItem();
	MainGraphicsPlayerArea->setSize(MainGraphicsView->size());

	MainVideoPlayer = new QMediaPlayer();
	MainVideoPlayer->setVideoOutput(MainGraphicsPlayerArea);

	MainGraphicsScene = new QGraphicsScene(0, 0, MainGraphicsView->size().width(), MainGraphicsView->size().height());

	MainGraphicsView->setScene(MainGraphicsScene);
	MainGraphicsView->scene()->addItem(MainGraphicsPlayerArea);

	MainPlayList = new QMediaPlaylist(MainVideoPlayer);
	MainPlayList->addMedia(initialURL);

	MainPlayList->setCurrentIndex(0);
	MainVideoPlayer->setPlaylist(MainPlayList);
	MainVideoPlayer->setNotifyInterval(100);
	MainVideoPlayer->play();

	MainVideoPlaylist = new QTVideoPlaylist();
	MainVideoPlaylist->setParent(this);
	resizeVideoPlaylistWidget();
	MainVideoPlaylist->show();

	MainVideoControls = new QTVideoControls();
	MainVideoControls->setParent(this);
	resizeVideoControlsWidget();
	MainVideoControls->show();

	videoControlsShown = true;
	videoPlaylistShown = true;

}