ffmpeg WMV > FLV on win2k

hey all. I have WMV's and Quicktime movies, and i downloaded the ffmpeg command-line tool and i really don't know how to use it, but i went online and i tried to do something like this:

ffmpeg -i a.wmv a.flv

and it doesn't seem to work. How can i get this thing to work. And even more importantly, maybe even get it automated, like when someone uploads , to convert whatever file to flv. AND... how do i use the flv so i can put it in a player online? This is the error i get from ffmpeg when i run the script above....

C:\>ffmpeg -i a.wmv a.flv
FFmpeg version SVN-r5969, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --enable-mp3lame --enable-libogg --enable-vorbis --enable-faad
 --enable-faac --enable-xvid --enable-x264 --enable-mingw32 --enable-a52 --enabl
e-dts --enable-pp --enable-gpl --enable-memalign-hack --enable-amr_nb --enable-a
mr_wb --enable-pthreads
  libavutil version: 49.0.0
  libavcodec version: 51.11.0
  libavformat version: 50.5.0
  built on Aug 10 2006 16:51:18, gcc: 4.1.1
[wmv3 @ 0090E6C0]Header: 4FF90A11

Seems that stream 1 comes from film source: 1000.00 (1000/1) -> 29.97 (30000/100
1)
Input #0, asf, from 'a.wmv':
  Duration: 00:48:27.8, start: 5.000000, bitrate: 556 kb/s
  Stream #0.0: Audio: wmav2, 44100 Hz, stereo, 80 kb/s
  Stream #0.1: Video: wmv3, yuv420p, 320x240, 29.97 fps(r)
Output #0, flv, to 'a.flv':
  Stream #0.0: Video: flv, yuv420p, 320x240, q=2-31, 200 kb/s, 29.97 fps(c)
  Stream #0.1: Audio: mp3, 44100 Hz, stereo, 64 kb/s
Stream mapping:
  Stream #0.1 -> #0.0
  Stream #0.0 -> #0.1
[wmv3 @ 0090E6C0]Header: 4FF90A11
Error while decoding stream #0.1kB time=999.6 bitrate= 274.7kbits/s
Error while decoding stream #0.1kB time=1659.2 bitrate= 273.9kbits/s
Internal buffer inconsistency. flushbits <> ResvSizebit reservoir error:
l3_side->main_data_begin: 264
Resvoir size:             -99568
resv drain (post)         -5
resv drain (pre)          0
header and sideinfo:      288
data bits:                1271
total bits:               1554 (remainder: 2)
bitsperframe:             1672
This is a fatal error.  It has several possible causes:90AME compiled with buggy
 version of gcc using advanced optimizations 9Your system is overclocked 1bug in
 LAME encoding libraryInternal buffer inconsistency. flushbits <> ResvSizeIntern
al buffer inconsistency. flushbits <> ResvSizeInternal buffer inconsistency. flu
shbits <> ResvSizeInternal buffer inconsistency. flushbits <> ResvSize

Thanx all!!!!

gyra