sky@sky-desktop ~ $ cd ~/Desktop
sky@sky-desktop ~/Desktop $ ffmpeg -i 142306432.mov -c:v h263 -ar 8000 -ac 1 142306432.3gp
ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 30 2014 01:05:29 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
  libavutil      52. 92.100 / 52. 92.100
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.100 / 55. 48.100
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.100 /  4. 11.100
  libavresample   1.  3.  0 /  1.  3.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '142306432.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2012-03-30 19:14:39
  Duration: 00:00:41.21, start: 0.000000, bitrate: 1357 kb/s
    Stream #0:0(eng): Video: svq3 (SVQ3 / 0x33515653), yuvj420p(pc), 480x360, 1168 kb/s, SAR 1:1 DAR 4:3, 29.97 fps, 29.97 tbr, 600 tbn, 600 tbc (default)
    Metadata:
      creation_time   : 2012-03-30 19:14:39
      handler_name    : Apple Alias Data Handler
      encoder         : Sorenson Video 3
    Stream #0:1(eng): Audio: adpcm_ima_qt (ima4 / 0x34616D69), 22050 Hz, stereo, s16p, 176 kb/s (default)
    Metadata:
      creation_time   : 2012-03-30 19:14:39
      handler_name    : Apple Alias Data Handler
File '142306432.3gp' already exists. Overwrite ? [y/N] y
[swscaler @ 0xa67a340] deprecated pixel format used, make sure you did set range correctly
[h263 @ 0xa688180] The specified picture size of 480x360 is not valid for the H.263 codec.
Valid sizes are 128x96, 176x144, 352x288, 704x576, and 1408x1152. Try H.263+.
Output #0, 3gp, to '142306432.3gp':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    Stream #0:0(eng): Video: h263, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 29.97 fps (default)
    Metadata:
      creation_time   : 2012-03-30 19:14:39
      handler_name    : Apple Alias Data Handler
      encoder         : Lavc55.69.100 h263
    Stream #0:1(eng): Audio: amr_nb, 0 channels, 128 kb/s (default)
    Metadata:
      creation_time   : 2012-03-30 19:14:39
      handler_name    : Apple Alias Data Handler
      encoder         : Lavc55.69.100 libopencore_amrnb
Stream mapping:
  Stream #0:0 -> #0:0 (svq3 (native) -> h263 (native))
  Stream #0:1 -> #0:1 (adpcm_ima_qt (native) -> amr_nb (libopencore_amrnb))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
sky@sky-desktop ~/Desktop $