Here is what I got:

/usr/local/bin/mencoder /var/www/vhosts/cubacabin.net/httpdocs/vshare
/video/DuckLanding.MOV_6.mov -o /var/www/vhosts/cubacabin.net/httpdocs/vshare/flvideo/118
8583604354811802.flv -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec
=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pr ed=3 -srate 22050 -lavfopts i_certify_t
hat_my_video_stream_does_not_use_b_frames
MEncoder dev-SVN-r24303-4.1.1 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Pentium(R) 4 CPU 3.40GHz (Family: 15, Model: 4, Stepping: 1)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

Option lavfopts: Unknown suboption i_certify_that_my_video_stream_does_not_use_b_fram es
Error parsing option on the command line: -lavfopts