root@ubuntu1:~# ffmpeg -codecs:v | grep "x264"
ffmpeg version git-2013-06-20-c605adb Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun 20 2013 18:43:37 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration:
  libavutil      52. 37.101 / 52. 37.101
  libavcodec     55. 16.100 / 55. 16.100
  libavformat    55.  9.100 / 55.  9.100
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 77.101 /  3. 77.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102