[FFmpeg-user] disable XXX code in configure ?

[sean darcy]

configure help shows:

   --disable-dct            disable DCT code
   --disable-dwt            disable DWT code
   --disable-error-resilience disable error resilience code
   --disable-lsp            disable LSP code
   --disable-lzo            disable LZO decoder code
   --disable-mdct           disable MDCT code
   --disable-rdft           disable RDFT code
   --disable-fft            disable FFT code

What is the default ? Disabled ? If so, should they be enabled on x86-64 ?

Is there any documentation on these ?

sean