QWidget on top of gstreamer

[Marco Trapanese]

Il 31/05/2013 15:06, George Kiagiadakis ha scritto:
> Transparency is not going to work with XOverlay. Qt needs to be aware 
> of the rendered content of all its sub-surfaces in order to composite 
> them and with XOverlay this is not the case. You need to use 
> qtglvideosink or qwidgetvideosink (from qt-gstreamer) instead.


Well, I've ended up with this code, placed in a QWidget with a 
QGst::Ui::VideoWidget inheritance:

             QGst::ElementPtr source = 
QGst::ElementFactory::make("filesrc");
             source->setProperty("location", "/home/marco/Video/video.mp4");
             QGst::ElementPtr sink = 
QGst::ElementFactory::make("qwidgetvideosink");
             QGst::Ui::VideoWidget::setVideoSink(sink);
             m_pipeline = QGst::Pipeline::create();
             m_pipeline->add(source);
             m_pipeline->add(sink);
             source->link(sink);
             QGst::BusPtr bus = m_pipeline->bus();
             bus->addSignalWatch();
             QGlib::connect(bus, "message", this, &Player::onBusMessage);
             m_pipeline->setState(QGst::StatePlaying);

I get the error: "Failed to create a painter for the given format"

Again, changing the source to "videotestsrc" leads the video test to 
show into the widget with the transparency enabled for any widget on top.

I searched for that error without find any doc about. What does that 
mean? What I have to change in the pipeline?

Thanks!
Marco