Thank you very much for the answers. The xpolicy.conf file is already updated, as I reinstalled mplayer few days ago after it stop to work.

When using the -ao pulse option the error is notappearing. but the sound is not there ...
I tried to use the general profile instead of the silent one without any luck.

So now the permissions seem to be fine. the pulse option is passed, but no sound ... strage -)

Thanks again