Please read this: http://wiki.qtcentre.org/index.php?t...ws_using_MinGW
But, you also need a GCC-adapted dvdmedia.h file from the Strawberry Perl (strawberryperl.com) package. Copy this dvdmedia.h into the include dir of MinGW, and recompile Phonon and backend.
Another way - you can recomile the whole Qt with Visual Studio C++.