$ ffmpeg -i myscreencast.ogg -r 10 -b 100 myscreencast.flv

$ ffmpeg -i rAA.ogg -r 10 -b 144 -s 480x360 raa480.flv

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 Oct  4 2006 10:57:36, gcc: 4.0.3 (Ubuntu 4.0.3-1ubuntu5)

Input #0, ogg, from 'rAA.ogg':
  Duration: 00:03:13.8, start: 0.000000, bitrate: 144 kb/s
  Stream #0.0: Video: theora, yuv420p, 1024x768, 10.00 fps
File 'raa480.flv' already exists. Overwrite ? [y/N] y

Output #0, flv, to 'raa480.flv':
  Stream #0.0: Video: flv, yuv420p, 480x360, 10.00 fps, q=2-31, 144 kb/s

Stream mapping:
  Stream #0.0 -> #0.0

[flv @ 0x8336c48]removing common factors from framerate

Press [q] to stop encoding
frame= 1939 q=0.0 Lsize=    3842kB time=193.9 bitrate= 162.3kbits/s
video:3812kB audio:0kB global headers:0kB muxing overhead 0.795200%