Untitled

ffmpeg -i video.mp4 -sameq video.rmvb

ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers

  built on Jun 12 2012 16:52:09 with gcc 4.6.3

*** THIS PROGRAM IS DEPRECATED ***

This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 0

    compatible_brands: isommp42

    creation_time   : 2012-03-13 21:11:41

  Duration: 00:05:05.36, start: 0.000000, bitrate: 327 kb/s

    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 480x360, 233 kb/s, 25 fps, 25 tbr, 50 tbn, 50 tbc

    Metadata:

      creation_time   : 1970-01-01 00:00:00

    Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 91 kb/s

    Metadata:

      creation_time   : 2012-03-13 21:11:41

Unable to find a suitable output format for 'video.rmvb'