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code:test ffmpeg -i withlogo.avi -acodec libamr_nb -ab 32 -ac 1 -ar 8000 -vcodec h263 -s qcif -r 10 temp.3gp
FFmpeg version SVN-r9419, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-libmp3lame --enable-libamr-nb --enable-libamr-wb
  libavutil version: 49.4.1
  libavcodec version: 51.40.4
  libavformat version: 51.12.1
  built on Jun 25 2007 16:18:42, gcc: 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)

Seems stream 0 codec frame rate differs from container frame rate: 30000.00 (30000/1) -> 29.97 (30000/1001)
Input #0, avi, from 'withlogo.avi':
  Duration: 00:04:15.0, start: 0.000000, bitrate: 579 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 720x480, 29.97 fps(r)
  Stream #0.1: Audio: mp2, 48000 Hz, stereo, 64 kb/s
File 'temp.3gp' already exists. Overwrite ? [y/N] y
Output #0, 3gp, to 'temp.3gp':
  Stream #0.0: Video: h263, yuv420p, 176x144, q=2-31, 200 kb/s, 10.00 fps(c)
  Stream #0.1: Audio: libamr_nb, 8000 Hz, mono, 0 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
[libamr_nb @ 0x8496b08]bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k
Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height