my output on executing the command

mencoder Track01.rm -ovc frameno -oac mp3lame -of rawaudio -lameopts cbr:br=128 -o Track01.mp3

was

MEncoder 2:1.0~rc2-0ubuntu13 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz (Family: 15, Model: 3, Stepping: 4)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
success: format: 0 data: 0x0 - 0xd1e3f
REAL file format detected.
Stream description: Audio Stream
Stream mimetype: audio/x-pn-realaudio
[real] Audio stream found, -aid 0
Stream mimetype: logical-fileinfo
Video stream is mandatory!

Exiting...

what is the problem ?? i didnt get my rm file converted into mp3