>ffmpeg -i h:/3gptest.3gp -acodec mp3 -ar 22050 -ab 32 -s
cif stream.flv
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --enable-memalign-hack --enable-mingw32 --enable-amr_nb --enab
le-amr_wb --enable-mp3lame --extra-cflags=-I/usr/local/include --extra-ldflags=-
L/usr/local/lib --cc=gcc -mno-cygwin --prefix=/usr/local
  libavutil version: 49.0.0
  libavcodec version: 51.11.0
  libavformat version: 50.5.0
  built on Aug 12 2006 10:47:01, gcc: 3.4.4 (cygming special) (gdc 0.12, using d
md 0.125)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'h:/3gptest.3gp':
  Duration: 00:00:13.4, start: 0.000000, bitrate: 151 kb/s
  Stream #0.0(und): Video: h263, yuv420p, 176x144, 10.00 fps(r)
  Stream #0.1(und): Audio: amr_nb, 8000 Hz, mono
Output #0, flv, to 'stream.flv':
  Stream #0.0: Video: flv, yuv420p, 352x288, q=2-31, 200 kb/s, 10.00 fps(c)
  Stream #0.1: Audio: mp3, 22050 Hz, mono, 32 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1