netcom@userstage:~/ffmpeg$ ./ffmpeg -i ../test.avi -vcodec libx264 -vprofile main -pix_fmt yuv420p test.h264
ffmpeg version N-34884-g7575980, Copyright (c) 2000-2011 the FFmpeg developers
  built on Nov 15 2011 12:23:00 with gcc 4.4.3
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-x11grab
  libavutil    51. 25. 0 / 51. 25. 0
  libavcodec   53. 34. 0 / 53. 34. 0
  libavformat  53. 20. 0 / 53. 20. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 48. 1 /  2. 48. 1
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[avi @ 0x32af760] parser not found for codec rawvideo, packets or times may be invalid.
Input #0, avi, from '../test.avi':
  Duration: 00:01:40.08, start: 0.000000, bitrate: 70734 kb/s
    Stream #0:0: Video: rawvideo, bgr24, 256x192, 59.95 tbr, 59.95 tbn, 59.95 tbc
File 'test.h264' already exists. Overwrite ? [y/N] n