Windows output

Data: ffmpeg version N-50442-g4f0d4ac Copyright (c) 2000-2013 the FFmpeg developers
  built on Mar  2 2013 15:30:48 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 17.103 / 52. 17.103
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.102 / 54. 63.102
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 41.100 /  3. 41.100
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[rawvideo @ 00000000002fb600] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, start: 0.000000, bitrate: 196608 kb/s
    Stream #0:0: Video: rawvideo (ARGB / 0x42475241), argb, 640x320, 196608 kb/s, 30 tbr, 30 tbn, 30 tbc

Data: Output #0, flv, to 'demo2013.flv':
  Metadata:
    encoder         : Lavf54.63.102
    Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 640x320, q=2-31, 200 kb/s, 1k tbn, 30 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> flv)

Data: frame=   19 fps=0.0 q=10.0 size=     164kB time=00:00:00.63 bitrate=2119.8kbits/s    
Data: frame=   34 fps= 33 q=10.0 size=     286kB time=00:00:01.13 bitrate=2064.4kbits/s    
Data: frame=   50 fps= 32 q=10.0 size=     424kB time=00:00:01.66 bitrate=2085.3kbits/s    
Data: frame=   65 fps= 32 q=10.0 size=     546kB time=00:00:02.16 bitrate=2065.2kbits/s    
Data: frame=   80 fps= 31 q=10.0 size=     668kB time=00:00:02.66 bitrate=2052.6kbits/s    
Data: frame=   95 fps= 31 q=10.0 size=     790kB time=00:00:03.16 bitrate=2044.6kbits/s    
Data: frame=  110 fps= 31 q=10.0 size=     923kB time=00:00:03.66 bitrate=2062.5kbits/s    
Data: frame=  125 fps= 31 q=10.0 size=    1047kB time=00:00:04.16 bitrate=2058.8kbits/s    
Data: frame=  140 fps= 31 q=10.0 size=    1170kB time=00:00:04.66 bitrate=2053.9kbits/s