d:\export>ffmpeg -i HNI_0020.avi -map 0:0 -map 0:1 -map 0:2 -s 480x240 -c:a -c:v
 mjpeg  out.avi
ffmpeg version N-54992-g63c0113 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jul 27 2013 18:02:46 with gcc 4.7.3 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
enable-libxvid --enable-zlib
  libavutil      52. 40.100 / 52. 40.100
  libavcodec     55. 19.100 / 55. 19.100
  libavformat    55. 12.102 / 55. 12.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 81.103 /  3. 81.103
  libswscale      2.  4.100 /  2.  4.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, avi, from 'HNI_0020.avi':
  Metadata:
    encoder         : Lavf55.12.102
  Duration: 02:03:40.95, start: 0.000000, bitrate: 3463 kb/s
    Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p, 800x240 [SAR 1:2 DA
R 5:3], 20 tbr, 20 tbn, 20 tbc
    Stream #0:1: Audio: adpcm_ima_wav ([17][0][0][0] / 0x0011), 48000 Hz, stereo
, s16p, 384 kb/s
    Stream #0:2: Video: mjpeg (MJPG / 0x47504A4D), yuvj420p, 800x240 [SAR 1:2 DA
R 5:3], 20 tbr, 20 tbn, 20 tbc
[NULL @ 04d201c0] Unable to find a suitable output format for 'mjpeg'
mjpeg: Invalid argument