localhost lucas # mplayer -ac help|grep -i ac3
MMX supported but disabled
MMX2 supported but disabled
SSE supported but disabled
3DNow supported but disabled
3DNowExt supported but disabled

raatrc      realaud   working   RealAudio ATRAC3  [atrc.so.6.0]
ra10atrc    realaud   working   RealPlayer 10 RealAudio ATRAC3  [atrc.so]
ra10atrcwin realaud   working   Win32 RealAudio 10 ATRAC3  [atrc.dll]
raatrcwin   realaud   working   Win32 RealAudio ATRAC3  [atrc3260.dll]
raatrcmac   realaud   working   Mac OS X RealAudio ATRAC3  [atrc.bundle/Contents/MacOS/atrc]
ffmac3      ffmpeg    untested  Macintosh Audio Compression and Expansion 3:1  [mace3]
a52         liba52    working   AC3-liba52  [liba52]
ac3         libac3    working   AC3-libac3  [libac3]
hwac3       hwac3     working   AC3 through S/PDIF
hwdts       hwac3     working   DTS through S/PDIF
atrac3      acm       problems  Sony ATRAC3  [atrac3.acm]
localhost lucas #