qmediaplayer and slow video playing error

i tried to run qt’s mediaplayer example on qws. i compiled qt 4.6 branch [1] with “-D QT_NO_QWS_CURSOR -D QT_QWS_CLIENTBLIT -openssl -no-webkit -phonon -phonon-backend -dbus -embedded arm -little-endian -xplatform qws/linux-arm-g++ -fast -v -opengl es2 -openvg -plugin-gfx-powervr” parameters but when i run this example with “-qws”, video plays very slowly (1 frame in 2-3 seconds and no sound, cpu usage 99%). i used narcissus online builder.(unstable rootfs image)
please help me