gistfile1.txt

ffmpeg version 0.11.1.git Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 30 2012 20:35:15 with Apple clang version 4.0 (tags/Apple/clang-421.0.57) (based on LLVM 3.1svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-libfreetype --cc=/usr/bin/clang --host-cflags='-Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.8' --host-ldflags='-L/usr/local/Cellar/gettext/0.18.1.1/lib -L/usr/local/lib -L/opt/X11/lib' --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libass --enable-libvo-aacenc --disable-ffplay
  libavutil      51. 66.100 / 51. 66.100
  libavcodec     54. 45.100 / 54. 45.100
  libavformat    54. 22.100 / 54. 22.100
  libavdevice    54.  2.100 / 54.  2.100
  libavfilter     3.  5.101 /  3.  5.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[flv @ 0x7fbbb281e200] Format flv probed with size=2048 and score=100
[flv @ 0x7fbbb281e200] File position before avformat_find_stream_info() is 13
[flv @ 0x7fbbb281e200] Non-increasing DTS in stream 0: packet 305 with DTS 12200, packet 306 with DTS 12200
[flv @ 0x7fbbb281e200] File position after avformat_find_stream_info() is 28422
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, flv, from 'foo.flv':
  Metadata:
    canSeekToEnd    : false
    createdby       : FMS 4.5
    creationdate    : Wed Jul 18 17:28:35 2012
  Duration: 00:00:12.24, start: 0.000000, bitrate: 18 kb/s
    Stream #0:0, 308, 1/1000: Audio: speex, 16000 Hz, mono
[abuffer @ 0x7fbbb24271c0] Setting entry with key 'time_base' to value '1/16000'
[abuffer @ 0x7fbbb24271c0] Setting entry with key 'sample_rate' to value '16000'
[abuffer @ 0x7fbbb24271c0] Setting entry with key 'sample_fmt' to value '(null)'
[abuffer @ 0x7fbbb24271c0] Setting entry with key 'channel_layout' to value '0x4'
[graph 0 input from stream 0:0 @ 0x7fbbb2427260] Invalid sample format '(null)'
Error opening filters!