"C:\YOUR_PATH_TO\mencoder.exe" "C:\YOUR_SOURCE_VIDEO.avi" -o RESULT.flv -mc 0 -ofps 25 -srate 44100 -oac mp3lame -lameopts vbr=2:q=8:aq=0:mode=1:lowpassfreq=16000 -ovc lavc -of lavf -lavfopts format=flv -lavcopts vcodec=flv:vbitrate=277:keyint=125:mbd=2:trell:v4mv:aic:cbp:last_pred=3:predia=4:dia=4:preme=2:vratetol=1100:vpass=1
"C:\YOUR_PATH_TO\mencoder.exe" "C:\YOUR_SOURCE_VIDEO.avi" -o RESULT.flv -mc 0 -ofps 25 -srate 44100 -oac mp3lame -lameopts vbr=2:q=8:aq=0:mode=1:lowpassfreq=16000 -ovc lavc -of lavf -lavfopts format=flv -lavcopts vcodec=flv:vbitrate=277:keyint=125:mbd=2:trell:v4mv:aic:cbp:last_pred=3:predia=4:dia=4:preme=2:vratetol=1100:vpass=2

;
;  Make sure your source video is uncompressed (or lossless x264 / huffyuv)
;  with 44.1 kHz 16 or 24 bit WAV audio all the way to feed it to mencoder
;  480x360 pixel resolution preferred, 640x480 576x432, 512x384 also quite possible
;  25 frames/sec. mandatory, and no more than 7 minutes of actual content
;  (the shorter the video, the higher the quality will be)
; 
;  Change value "vbitrate=277" to your likings!
;  Use MediaInfo to check FLV bitrate average;
:  if it's 350 kbits/s or higher, lower vbitrate to match it to reach exactly 349 kbits/s
;
;  You can also change values
;  keyint=125, q=8, lowpassfreq=16000
;  to achieve a different end-result bitrate.
;
;  keyint=100 (a keyframe every 4 seconds)
;  keyint=150 (a keyframe every 6 seconds)
;  
;  q=7 (higher bitrate audio-stream)
;  q=9 (lower bitrate audio-stream)
;
;  lowpassfreq=15000 (FM stereo quality range, causes lower rate)
;  lowpassfreq=19000 (human hearing quality range, causes higher audio rate)
;
;
;  mode=1 (joint stereo, best choice for lame vbr mp3 audio)
;  mode=3 (mono audio stream, lowers audio bitrate a little)
;
;
;  More mencoder options: http://www.mplayerhq.hu/DOCS/man/en/mplayer.1.html
;  Download mencoder here: http://oss.netfarm.it/mplayer-win32.php
;
;  More info: http://forum.videohelp.com/topic345987.html
;