~/Videos/Heaven or Hell Pack$ ffmpeg -i 1920_12000-hd.wmv -vcodec libx264 -preset ultrafast -acodec aac -fs limit_size=2355200000 output.mp4
ffmpeg version 0.10.2.git Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun  4 2012 20:04:51 with gcc 4.6.3
  configuration: --enable-gpl --enable-libx264
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Guessed Channel Layout for  Input Stream #0.0 : stereo
Input #0, asf, from '1920_12000-hd.wmv':
  Duration: 00:59:28.76, start: 0.000000, bitrate: 12156 kb/s
    Stream #0:0: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, s16, 128 kb/s
    Stream #0:1: Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 0 kb/s, 30.30 fps, 29.97 tbr, 1k tbn, 29.97 tbc
Expected number for fs but found: limit_size=2355200000