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    <p>Since Phonon is based on gstreamer, the place to look for details is the Phonon source tree (available here: <a href="http://gitorious.org/phonon/import/trees/master" rel="noreferrer">http://gitorious.org/phonon/import/trees/master</a>). For a video player you are most likely going to need a video display widget, such as the <a href="http://gitorious.org/phonon/import/blobs/master/gstreamer/videowidget.h" rel="noreferrer">gstreamer/videowidget.h</a> (<a href="http://gitorious.org/phonon/import/blobs/master/gstreamer/videowidget.cpp" rel="noreferrer">cpp</a>) that in turn used the X11 renderer (<a href="http://gitorious.org/phonon/import/blobs/master/gstreamer/x11renderer.h" rel="noreferrer">gstreamer/x11renderer.h</a>, <a href="http://gitorious.org/phonon/import/blobs/master/gstreamer/x11renderer.cpp" rel="noreferrer">cpp</a>). The sink used is the <a href="http://gstreamer.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-xvimagesink.html" rel="noreferrer">xvimagesink</a>, falling back onto the <a href="http://gstreamer.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-ximagesink.html" rel="noreferrer">ximagesink</a> if the first cannot be created.</p> <p>The basic trick is to overlay the VideoWidget with the video output. The X11 handle needed to do this is retrieved using the <a href="http://doc.trolltech.com/4.6/qwidget.html#winId" rel="noreferrer">QWidget::winId</a> method, which is platform specific (as are the sinks, so no biggie).</p> <p>Also, if overlay is unavailable, a <a href="http://gitorious.org/phonon/import/blobs/master/gstreamer/qwidgetvideosink.h" rel="noreferrer">QWidgetVideoSink</a> is used, which converts the video frames into individual frames for the <a href="http://gitorious.org/phonon/import/blobs/master/gstreamer/widgetrenderer.h" rel="noreferrer">WidgetRenderer</a> class. This class, in turn, makes the current frame available as a QImage object, ready for any type of processing.</p> <p>So to answer your question - <em>use either overlays (as X11Renderer) or extract individual QImages from the video stream (as QWidgetVideoSink)</em>.</p>
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