Adding label to video - qt

Question

I have to write a simple video player that can display some subtitles,link or a picture(like on YouTube) in a certain time. I have no idea of how do display anything using QVideoWidget. I couldn't find any useful class to do it. Could you please give me some advices?
I did It your way but after i load any video QLabel disappears...
player->setVideoOutput(vw);
playlistView->setMaximumWidth(200);
playlistView->setMinimumWidth(300);
window = new QWidget;
Playerlayout = new QGridLayout;
subtitleWidget = new QLabel;
subtitleWidget->setMaximumWidth(1000);
subtitleWidget->setMaximumHeight(100);
subtitleWidget->setStyleSheet("QLabel {background-color : red; color
blue;}");
subtitleWidget->setAlignment(Qt::AlignCenter | Qt::AlignBottom);
subtitleWidget->setWordWrap(true);
subtitleWidget->setText("example subtitle");
Playerlayout->addWidget(vw,0,0);
Playerlayout->addWidget(subtitleWidget,0,0);
Playerlayout->addWidget(playlistView,0,1,1,2);

Answer 1

If QVideoWidget doesn't provide what you require directly then you could always set up an overlay.
The basic layout item hierarchy would be something like...
QWidget
layout
QVideoWidget
subtitle_widget
In this case the layout could be either a QStackedLayout using stacking mode QStackedLayout::StackAll or a QGridLayout with both the QVideoWidget and the subtitle_widget occupying the same cells but with the correct z-order.
Going with the QGridLayout...
auto *w = new QWidget;
auto *l = new QGridLayout(w);
auto *video_widget = new QVideoWidget;
auto *subtitle_widget = new QLabel;
/*
* Subtitles will be shown at the bottom of the 'screen'
* and centred horizontally.
*/
subtitle_widget->setAlignment(Qt::AlignHCenter | Qt::AlignBottom);
subtitle_widget->setWordWrap(true);
/*
* Place both the video and subtitle widgets in cell (0, 0).
*/
l->addWidget(video_widget, 0, 0);
l->addWidget(subtitle_widget, 0, 0);
Subtitles etc. can now be displayed simply by invoking subtitle_widget->setText(...) at the appropriate time.
The same method can easily be extended to overlaying other types of information.