Hi,
I'm new to linux and in way over my head here. I'm trying to convert a Real Media video stream (from MIT Open Courseware) I ripped using Mplayer to something I can put on my 60GB IPod. I have ffmpeg. I tried the command line from the FAQ:

ffmpeg -i /media/hda4/Video/physics.rm -acodec mp3 -ab 128 -vcodec mpeg4 -b 1200 -mbd 2 -flags +4mv+trell -aic 2 -cmp 2 -subcmp 2 -s 320x180 -title Lecture1 /media/hda4/Video/physics.mp4
ffmpeg version CVS, build 3276800, Copyright (c) 2000-2004 Fabrice Bellard
configuration: --extra-cflags=-fomit-frame-pointer -DRUNTIME_CPUDETECT --build i486-linux-gnu --enable-gpl --enable-pp --enable-zlib --enable-vorbis --enable-libogg --enable-theora --enable-a52 --enable-dts --enable-dc1394 --enable-libgsm --disable-debug --prefix=/usr
built on Nov 24 2005 10:19:02, gcc: 4.0.3 20051121 (prerelease) (Ubuntu 4.0.2-4ubuntu3)
Input #0, rm, from '/media/hda4/Video/physics.rm':
Duration: 00:47:48.8, start: 0.000000, bitrate: 222 kb/s
Stream #0.0: Audio: 0x0000, 32 kb/s
Stream #0.1: Video: rv20, yuv420p, 320x240, 12.00 fps, 187 kb/s
Resampling with input channels greater than 2 unsupported.Can't resample. Aborting.
Abort at ffmpeg.c:1704
Aborted

If I try -acodec aac i get Unknown Codec "aac"

I am using Ubuntu 6.06. I have installed and reinstalled libfaac and libfaad.

Thanks,
Dave