Qml video wmfengine trouble

[qtnext]

hi,
i need to display video in my windows qml application. it works with directshow (but i need to use coreavc to display video on seven ... the directshow native plugins don't works)... so i wants to use wmfengine that use windows media foundation .. it works but :

• there is a crash at the end : easy ! supportedformatschange is called when setting surface at null at the end (so i add a check)

@ {
QMutexLocker locker(&m_mutex);
m_pixelFormats.clear();
clearMediaTypes();
if(m_surface==NULL) return;
QListQVideoFrame::PixelFormat formats = m_surface->supportedPixelFormats();
@

no it play fine, bu when releasing it take a few seconds !!! and i have the following console message : session close time out!

is there anyone using this plugins with success ?