D:\Users\Shimmy\Downloads\Converted Files>ffmpeg -i avisample.avi output.amv
ffmpeg version N-40126-ga4b58fd Copyright (c) 2000-2012 the FFmpeg developers
  built on Apr 26 2012 03:33:03 with gcc 4.6.3
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enab
le-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable
-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschro
edinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      51. 47.100 / 51. 47.100
  libavcodec     54. 15.100 / 54. 15.100
  libavformat    54.  3.100 / 54.  3.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 72.100 /  2. 72.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 11.100 /  0. 11.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, avi, from 'avisample.avi':
  Metadata:
    comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music:
Steve Ball
    copyright       : © 2008 Microsoft Corporation
    title           : Wildlife in HD
    encoder         : Lavf53.13.0
  Duration: 00:00:30.17, start: 0.000000, bitrate: 1521 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.
97 tbr, 29.97 tbn, 30k tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16, 128 kb/s
[NULL @ 0000000001f04950] Unable to find a suitable output format for 'output.amv'
output.amv: Invalid argument

D:\Users\Shimmy\Downloads\Converted Files>