@SGaist Hi,
I am using Qt version 6.5.0,
on Windows,
and to open fullscreen I am using the following code:

void VideoWidget::mouseDoubleClickEvent(QMouseEvent *event) { setFullScreen(!isFullScreen()); event->accept(); }

VideoWidget is just a derived class from QVideoWidget

Hi and welcome to devnet,

The probe APIs have been removed. See here.

You might be able to do something with the QAudioDecoder class.

On a side note, please use coding tags around your code. That will make it readable.