How to Two overlapping QVideowidgets with transparency

[vman]

Hi,

I would like to play two videos simultaneously and have the Output mixed. I'm using QT 5.2 on Windows 8.1 with MinGW 4.8. My approach is as follows:

@ playerA = new QMediaPlayer(this);
playerB = new QMediaPlayer(this);

videoWidgetA = new VideoWidget(this);
playerA->setVideoOutput(videoWidgetA);

videoWidgetB = new VideoWidget(this);
playerB->setVideoOutput(videoWidgetB);

QBoxLayout *displayLayout = new QHBoxLayout;
displayLayout->addWidget(videoWidgetA);
videoWidgetB->setParent(videoWidgetA);
// Position videoWidgetB that it covers 1/4 of videoWidgetA
videoWidgetB->setGeometry(0,0,480,270);

displayLayout->setMargin(0);
setLayout(displayLayout);

playerA->setMedia(QUrl::fromLocalFile("x:/Videos/1.wmv"));
playerB->setMedia(QUrl::fromLocalFile("x:/Videos/2.wmv"));

videoWidgetB->setWindowOpacity(0.5);
videoWidgetA->setWindowOpacity(0.5);

playerA->play();
playerB->play();@

VideoWidgetB opacity is allways 1.0 and VideowidgetA is not visible were videoWidgetB covers the screen, there is no transparency.

The serious this is if I append

@ this->setWindowOpacity(0.5);@

then I can see the desktop through videoWidgetA and videoWidgetB, but not videoWidgetA through videoVidgetB.

Hope my text is not to confusing.