Phonon: Video background is white

Phonon: Video background is white. Better default color for video background is black as in other video players
There are white flashes if video widget size is changed. There is white screen if video is stopped.

Reproducible for example with qmediaplayer demo application (on N8):

-Start video streaming
-Press menu key so that app goes to background
-Go back to application
-Rotate screen so that screen orientation changes
-> Video image does not cover the video area anymore. The default white background is seen

-Start video streaming
-Set to fullscreen
-Rotate device
-> You can see the default white color flashing around the screen

-Start video streaming
-Set to fullscreen
-Wait until the end of the video
-> Screen is now white