Patched

1.Use lavf first in ffms and lavf
2.Add sar to x264 SEI info header
3.Auto keyint
  When --keyint is negative value or "auto", keyint_max is set to fps * 10 automatically.
4.Add "--show-param2" option and more precision to the CRF logging.
  This is based on komisar's cosmetic patch.
  Some people don't like it to show most of settings while  encoding.
5.Increase the temporal buffer size for Unicode support
  Although the maximum size of one character in UTF-16 is 4bytes,
  sizeof(wchar_t) is 2bytes on Windows.
  Also, non-ASCII characters requires 2bytes in ANSI code page.
  The existing buffer size is insufficient.
6.cosmetics for x264 log info,same to 8bit and show x264 version