Hi,
I am not sure about actionscript. I think the correct method would be to use Phonon, it is a multimedia player in QT. There is a player called 'swfdec', google it, that may help.
My flashplayer API is in another application, and I use a communication method between the two processes to play the swf file.
In my flashplayer API application I reserve a region of the framebuffer when an SWF object is playing. Of course the main qt app cannot access this region at the time the SWF object is playing.