[MEncoder-users] mencoder -af help not working

[sfullenwider]

In the man page it says "NOTE: To get a full list of available audio 
filters, see -af help."

but when I try I get:
sfullenwider at aristotle ~/Projects/project1/src $ mencoder -af help
MEncoder dev-SVN-r21812-4.1.1 (C) 2000-2006 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3000+ (Family: 15, Model: 47, Stepping: 2)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2

No file given

Exiting... (error parsing command line)

I tried again using the latest svn mencoder and it behaves the same.  Is 
there another way to find out what audio filters are available?


Finding out what video filters (-vf help) are available works.