derp@debian:/mp4# ffmpeg -i video.mp4 -b:v 1M -b:a 1M /mxf/video.mxf
ffmpeg version 0.8.17-6:0.8.17-1, Copyright (c) 2000-2014 the Libav developers
  built on Mar 15 2015 17:31:12 with gcc 4.7.2
The ffmpeg program is only provided for script compatibility and will be removed
in a future release. It has been deprecated in the Libav project to allow for
incompatible command line syntax improvements in its replacement called avconv
(see Changelog for details). Please use avconv instead.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x970cdc0] stream 2, missing mandatory atoms, broken header
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x970cdc0] stream 3, missing mandatory atoms, broken header
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x970cdc0] max_analyze_duration reached
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : wmf
    minor_version   : 65537
    compatible_brands:
    creation_time   : 2002-06-14 11:31:22
  Duration: 00:00:15.06, start: 0.000000, bitrate: 36 kb/s
    Stream #0.0(eng): Video: mpeg4 (Simple Profile), yuv420p, 176x144 [PAR 1:1 DAR 11:9], 25 kb/s, 7.50 fps, 15 tbr, 1k tbn, 15 tbc
    Metadata:
      creation_time   : 2002-06-14 11:31:22
    Stream #0.1(eng): Audio: mp4a / 0x6134706D, 8000 Hz, 2 channels, 8 kb/s
    Metadata:
      creation_time   : 2002-06-14 11:31:22
    Stream #0.2(eng): Data: mp4s / 0x7334706D
    Metadata:
      creation_time   : 2002-06-14 11:31:22
    Stream #0.3(eng): Data: mp4s / 0x7334706D
    Metadata:
      creation_time   : 2002-06-14 11:31:22
[buffer @ 0x9723be0] w:176 h:144 pixfmt:yuv420p
Incompatible sample format '(null)' for codec 'pcm_s16le', auto-selecting format 's16'
[mpeg2video @ 0x9720860] MPEG1/2 does not support 15/1 fps
Output #0, mxf, to '/mxf/video.mxf':
    Stream #0.0(eng): Video: mpeg2video, yuv420p, 176x144 [PAR 1:1 DAR 11:9], q=2-31, 200 kb/s, 90k tbn, 15 tbc
    Metadata:
      creation_time   : 2002-06-14 11:31:22
    Stream #0.1(eng): Audio: pcm_s16le, 8000 Hz, 2 channels, s16, 256 kb/s
    Metadata:
      creation_time   : 2002-06-14 11:31:22
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height