qt and media files

i made FS using Buildroot and BusyBox
,included Qt framework with phonon modules
,then cross compiled Qt media application for my board "Mini2440"

but no media files make sound

im using (wav,mp3,ogg) files and in Buildroot i included Gstreamer , good plugins , and any codec has name oog , wav or mp3

can any one list codec needed in buildroot to be able to play these media files

and does Qt needs extra codec to play media?

thx in advance

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