When i change it to the other command, it does not even do the first process it was doing. Here is the error i get in the debug file. Any suggestion. Your help is appreciated.

2008-01-30 6:03:21 Upload Finished
2008-01-30 6:03:21 STARTING VIDEO CONVERSION (process_queue.id = 18)
2008-01-30 6:03:21 File: /var/www/vhosts/sidgroups.com/httpdocs/video/airtel_3.mpg
2008-01-30 6:03:21 ################################################## ##
2008-01-30 6:03:21 INSERT INTO video SET
UID='2',
seo_name='trying',
title='trying',
description='trying',
keyword='trying',
channel='0|15|16|17|0',
vdoname='airtel_3.mpg',
flvdoname='12016982011915144121.flv',
addtime='1201698201',
adddate='2008-01-30',
type='public',
active='0',
approve='1'
2008-01-30 6:03:21 ################################################## ##
2008-01-30 6:03:21 Video id: 17
2008-01-30 6:03:21 Find video duration - START
2008-01-30 6:03:21 Duration (ffmpeg-php): 23

2008-01-30 6:03:21 DURATION: 00:23
2008-01-30 6:03:21 Create Thumbnail - START
2008-01-30 6:03:22 Create Thumbnail with ffmpeg-php - END
2008-01-30 6:03:22 CONVERT COMMAND: /usr/bin/mencoder '/var/www/vhosts/sidgroups.com/httpdocs/video/airtel_3.mpg' -o /var/www/vhosts/sidgroups.com/httpdocs/flvideo/12016982011915144121.flv -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:l ast_pred=3 -srate 22050 -lavfopts i_certify_that_my_video_stream_does_not_use_b_fram es
2008-01-30 6:03:22 ################################################## ##
2008-01-30 6:03:22 MEncoder dev-SVN-r25849-4.1.2 (C) 2000-2008 MPlayer Team
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (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


Exiting... (error parsing command line)

2008-01-30 6:03:22 ################################################## ##
2008-01-30 6:03:22 Return value: Exiting... (error parsing command line)
2008-01-30 6:03:22 Running flvtool2: /usr/bin/flvtool2 -U /var/www/vhosts/sidgroups.com/httpdocs/flvideo/12016982011915144121.flv
2008-01-30 6:03:22 Calling process_video[18,0]

Any suggestion?