孙叔敖被选取的故事:Mplayer播放AVI没声音

多数的AVI都没问题，但有些却不行，已经安装了暴风影音，但还是没声。
下边是MLPAYER显示的信息
=======================================
AVI file format detected.
VIDEO: [XVID] 640x360 24bpp 23.976 fps 749.0 kbps (91.4 kbyte/s)
Clip info:
Software: AVI-Mux GUI 1.16.11, Dec 15 2004 14:51:34
==========================================================================
Cannot find codec for audio format 0xFF.
Read DOCS/HTML/en/codecs.html!
==========================================================================
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
==========================================================================
Audio: no sound
Starting playback...
VDec: vo config request - 640 x 360 (preferred csp: Planar YV12)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
SwScaler: using unscaled Planar YV12 -> BGR 16-bit special converter
VO: [directx] 640x360 => 640x360 BGR 16-bit
===================================
拜托高人帮忙...
那个音频格式好像是ACC的，请问Mplayer的ACC插件有吗？