[MPlayer-users] convert .rm to .avi

[Ding Li]

I used this command to convert .rmvb file to .avi,
mencoder a.rm -ovc lavc -oac mp3lame -o output.avi 
 but I got an error msg "
MEncoder 1.0pre7-3.4.2 (C) 2000-2005 MPlayer Team
CPU: Intel  (Family: 8, Stepping: 1)
Detected cache-line size is 64 bytes
CPUflags: Type: 8 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

File not found: 'frameno.avi'
Failed to open frameno.avi
MPlayer was compiled without libmp3lame support.

Exiting... (error parsing cmdline)
"

what's wrong with the command? and what's the possible correct command?

Thanks