[root@localhost drive_c]# wine /video/mythtv/avs_for_windows/avs2yuv.exe myclip.avs - | mencoder - -o hfyu.avi -ovc lavc -lavcopts vcodec=ffvhuff:vstrict=-1:pred=2:context=1
MEncoder 1.0rc1-4.1.1 (C) 2000-2006 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3000+ (Family: 15, Model: 12, Stepping: 0)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2

err:imagelist:ImageList_ReplaceIcon no color!
err:imagelist:ImageList_ReplaceIcon no color!
err:imagelist:ImageList_ReplaceIcon no color!
err:imagelist:ImageList_ReplaceIcon no color!
Reading from stdin...
success: format: 0  data: 0x0 - 0x0
fixme:avifile:AVIFileExit (): stub!

Avisynth error:
AVISource: couldn't locate a decompressor for fourcc mjpg
(myclip.avs, line 1)
============ Sorry, this file format is not recognized/supported =============
=== If this file is an AVI, ASF or MPEG stream, please contact the author! ===
Cannot open demuxer.

Exiting...
[root@localhost drive_c]#