[solved] How to play a video on a translucent QWidget?

[hdeldar]

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?

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#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"));

mediaPlayer.play();

w->show();
return app.exec();

}
@

when two line
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w->setWindowFlags(Qt :: Window | Qt::FramelessWindowHint ); w->setAttribute(Qt::WA_TranslucentBackground, true);
@
remove the movie show correctly.

[hdeldar]

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 the case i use a custom video widget and in paintEvent after createing QPainter painter(this); add
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painter.setCompositionMode(QPainter::RasterOp_SourceAndNotDestination); or
painter.setCompositionMode(QPainter::RasterOp_SourceAndDestination);
@
to change the composition mode.

[liyingzai]

@hdeldar I did it in your way, but I did not work Correct.
Can you show me your demo?