How to play a video on a translucent QWidget?

I want to play a movie on a QWidget that has Qt::FramelessWindowHint flag and Qt::WA_TranslucentBackground attirbute using QVideoWidget or QGraphicsVideoItem. But the video is not visible. I hear only sound. What is the problem?


#include "videoplayer.h" #include <QtWidgets/QApplication> #include "qboxlayout.h" #include "qvideowidget.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); QWidget *w = new QWidget; w->setWindowFlags(Qt :: Window | Qt::FramelessWindowHint ); w->setAttribute(Qt::WA_TranslucentBackground, true); w->setMinimumSize(300,200); QVideoWidget *videoWidget = new QVideoWidget; QBoxLayout *controlLayout = new QHBoxLayout; controlLayout->setMargin(0); controlLayout->addWidget(videoWidget); w->setLayout(controlLayout); QMediaPlayer mediaPlayer; mediaPlayer.setVideoOutput(videoWidget); mediaPlayer.setMedia(QUrl::fromLocalFile("C:/1.wmv")); videoWidget->show(); mediaPlayer.play(); w->show(); return app.exec(); }


I solve the problem .when we set the WA_TranslucentBackground flag and FramelessWindowHint attribute the QVideoWidget's QPainter going to QPainter::CompositionMode_DestinationOver mode and it cause to nothing to show or a shadow on the screen . in this case i use a custom video widget and in paintEvent after createing QPainter painter(this); add

painter.setCompositionMode(QPainter::RasterOp_SourceAndNotDestination); or painter.setCompositionMode(QPainter::RasterOp_SourceAndDestination);

to change the composition mode.


I've implemented VideoWidget some time ago. The only thing you shall change is your video path and set FramelessWindowHint flag.

You can find source here.


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