QGraphicsVideoItem does not work properly on Maemo6 inside a Meego Touch Application

If you use the attached test case (pass the local path to a video as argument) and build it for Maemo6/Meego the video is not rendered properly. If you flick the view (bottom or top) with the fingers you can see the video playing underneath a black "thing"...It also displays lot of errors in the terminal :

"output_loop: empty buffer
examples[10577]: GLIB CRITICAL ** default - gst_x_overlay_set_render_rectangle: assertion `(x == -1 && y == -1 && width == -1 && height == -1) || (x >= 0 && y >= 0 && width > 0 && height > 0)' failed"

You can build the test case in scratchbox, you need to install the dev packages of MeegoTouch and Qt. You can use a custom build of Multimedia but you need to install chrpath package and call chrpath -d on the binary you get so that LD_LIBRARY_PATH will be used to pick your custom QtMultimedia...