[FFmpeg-user] mac OS X avfoundation not listing audio devices

[Paul Evans]

I am trying to list all devices on my MacBook Pro running El Capitan, but am surprised that the only device listed is the FaceTime HD Camera.
FFMPEG was installed using homebrew and the version I am running is 2.3.3

Command: 
ffmpeg -f avfoundation -list_devices true -i “”

Output:
ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 19 2014 15:04:20 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      52. 92.100 / 52. 92.100
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.100 / 55. 48.100
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.100 /  4. 11.100
  libavresample   1.  3.  0 /  1.  3.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
[AVFoundation input device @ 0x7facb1625600] AVFoundation video devices:
[AVFoundation input device @ 0x7facb1625600] [0] FaceTime HD Camera (Built-in)
: Input/output error

I would have expected to see some audio options in there as well so am somewhat confused about what is going wrong.  The internal microphone is available on the system.