aac_coder 0 works

ffmpeg.fdk-aac.exe -i sintel.mpg -vn  -acodec aac -aac_coder 0 -strict experimental -ac 6 -ab 384k  -t 30 sintel.mpg.aac_exp.acoder.aac
ffmpeg version N-44672-g41f7e06 Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct  3 2012 12:44:45 with gcc 4.7.1 (GCC)
  configuration: --enable-memalign-hack --arch=x86 --enable-gpl --enable-libx264 --enable-avisynth --enable-libxvid --target-os=mingw32 --cross-prefix=/home/rogerdpack/dev/ffmpeg-windows-build-helpers/sandbox/mingw-w64-i686/bin/i686-w64-mingw32- --pkg-config=pkg-config --enable-libmp3lame --enable-version3 --enable-libvo-aacenc --enable-libvpx --extra-libs=-lws2_32 --extra-libs=-lpthread --enable-zlib --extra-libs=-lwinmm --extra-libs=-lgdi32 --enable-librtmp --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --disable-optimizations --enable-mmx --disable-postproc --enable-fontconfig --enable-libass --enable-libutvideo --enable-libopus --disable-w32threads --extra-cflags=-DPTW32_STATIC_LIB --enable-nonfree --enable-libfdk-aac --enable-runtime-cpudetect
  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 57.100 / 54. 57.100
  libavformat    54. 27.101 / 54. 27.101
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 16.106 /  3. 16.106
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
[mpeg2video @ 01D786C0] ac-tex damaged at 40 7
[mpeg2video @ 01D786C0] Warning MVs not available
[mpeg2video @ 01D786C0] concealing 1035 DC, 1035 AC, 1035 MV errors in I frame
[mpeg @ 01D77EC0] max_analyze_duration 5000000 reached at 5024000
Input #0, mpeg, from 'sintel.mpg':
  Duration: 00:14:47.58, start: 0.233367, bitrate: 4132 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 7000 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s
Output #0, adts, to 'sintel.mpg.aac_exp.acoder.aac':
  Metadata:
    encoder         : Lavf54.27.101
    Stream #0:0: Audio: aac, 48000 Hz, 5.1, flt, 384 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (ac3 -> aac)
Press [q] to stop, [?] for help
size=    1357kB time=00:00:30.01 bitrate= 370.5kbits/s
video:0kB audio:1348kB subtitle:0 global headers:0kB muxing overhead 0.713795%

exp fails

ffmpeg.fdk-aac.exe -i sintel.mpg -vn  -acodec aac -strict experimental -ac 6 -ab 384k  -t 30 sintel.mpg.aac_exp.aac
ffmpeg version N-44672-g41f7e06 Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct  3 2012 12:44:45 with gcc 4.7.1 (GCC)
  configuration: --enable-memalign-hack --arch=x86 --enable-gpl --enable-libx264 --enable-avisynth --enable-libxvid --target-os=mingw32 --cross-prefix=/home/rogerdpack/dev/ffmpeg-windows-build-helpers/sandbox/mingw-w64-i686/bin/i686-w64-mingw32- --pkg-config=pkg-config --enable-libmp3lame --enable-version3 --enable-libvo-aacenc --enable-libvpx --extra-libs=-lws2_32 --extra-libs=-lpthread --enable-zlib --extra-libs=-lwinmm --extra-libs=-lgdi32 --enable-librtmp --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libopenjpeg --enable-gnutls --enable-libgsm --enable-libfreetype --disable-optimizations --enable-mmx --disable-postproc --enable-fontconfig --enable-libass --enable-libutvideo --enable-libopus --disable-w32threads --extra-cflags=-DPTW32_STATIC_LIB --enable-nonfree --enable-libfdk-aac --enable-runtime-cpudetect
  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 57.100 / 54. 57.100
  libavformat    54. 27.101 / 54. 27.101
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 16.106 /  3. 16.106
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
[mpeg2video @ 01F420A0] ac-tex damaged at 40 7
[mpeg2video @ 01F420A0] Warning MVs not available
[mpeg2video @ 01F420A0] concealing 1035 DC, 1035 AC, 1035 MV errors in I frame
[mpeg @ 01F2F820] max_analyze_duration 5000000 reached at 5024000
Input #0, mpeg, from 'sintel.mpg':
  Duration: 00:14:47.58, start: 0.233367, bitrate: 4132 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 7000 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s
Output #0, adts, to 'sintel.mpg.aac_exp.aac':
  Metadata:
    encoder         : Lavf54.27.101
    Stream #0:0: Audio: aac, 48000 Hz, 5.1, flt, 384 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (ac3 -> aac)
Press [q] to stop, [?] for help
size=     754kB time=00:00:30.01 bitrate= 205.8kbits/s
video:0kB audio:745kB subtitle:0 global headers:0kB muxing overhead 1.292095%