thank you guys!
I fixed my mplayer about the "libaudiofile.so.0" thing, it works now, and that "sudo cp ..." didn't work and neither screw any thing, Alien Bob was right.

there is still another problem comes out when i play ".rm/.rmvb" file,which like this ""ERROR: Could not open required DirectShow codec drvc.bundle/Contents/MacOS/drvc" ,and some times like this:"MPlayer crashed by bad usage of CPU/FPU/RAM...."

i downloaded the essential-amd64-20071007.tar.bz2, and got "cook.so/drvc.so/sipr.so" into the /usr/lib64/codecs dir, but that error msgs still came out every time i play realmedia file, what is strange is excepting that anoying prompt error, realmedia file can be played well either have that three codec file or not.

can anyone helps ?

Regards