[MEncoder-users] /dev/null on Windows

[GeBu]

In my linux script I have this part /dev/null I would like to use this 
script on Windows. Do you know how can I change this part?
Jirka (GeBu)

Comands:
**      1. PASS         **
mencoder file.avi -o /dev/null -oac mp3lame -lameopts
cbr:br=96:mode=3:aq=0 -ovc x264 -x264encopts
bitrate=1000:pass=1:turbo=1:qcomp=0.8:frameref=3:bframes=3:subq=5:me=hex:b_pyramid:weight_b:partitions=all:8x8dct 

-vf pp=lb,scale=768:576 -aspect 4:3

**     2/3. PASS        **
mencoder file.avi -o Vyst2.avi -oac mp3lame -lameopts
cbr:br=96:mode=3:aq=0 -ovc x264 -x264encopts
bitrate=1000:pass=2:qcomp=0.8:frameref=3:bframes=3:subq=5:me=hex:b_pyramid:weight_b:partitions=all:8x8dct 

-vf pp=lb,scale=768:576 -aspect 4:3