[issue2653] Memory access errors in aac encoder

New submission from Gian-Carlo Pascutto <gcp <at> sjeng.org>:

I wanted to take a look why the AAC encoder performs so bad, but I didn't get far:

$ gdb ./ffmpeg_g.exe
GNU gdb (GDB) 7.2
<...>
Reading symbols from c:\Projects\ffmpeg/./ffmpeg_g.exe...done.
(gdb) run -i c:/work/samples/after.wav after.aac
Starting program: c:\Projects\ffmpeg/./ffmpeg_g.exe -i c:/work/samples/after.wav
 after.aac
[New Thread 896.0x1010]
FFmpeg version git-f1ef2cd, Copyright (c) 2000-2011 the FFmpeg developers
  built on Mar  8 2011 22:41:07 with gcc 4.5.2
  configuration: --disable-ffprobe --disable-ffserver --disable-everything --dis
able-network --enable-ffmpeg --enable-encoder='aac,pcm_f32le,pcm_f64le,pcm_s16le
,pcm_s24le,pcm_s32le,pcm_u16le,pcm_u24le,pcm_u32le,pcm_u8,aac,aac_ltm' --enable-
parser='aac,aac_ltm,flac' --enable-muxer='adts,aiff,mp4,pcm_f32le,pcm_f64le,pcm_
s16le,pcm_s24le,pcm_s32le,pcm_u16le,pcm_u24le,pcm_u32le,pcm_u8,wav' --enable-dem
uxer='aac,pcm_f32le,pcm_f64le,pcm_s16le,pcm_s24le,pcm_s32le,pcm_u16le,pcm_u24le,
pcm_u32le,pcm_u8.flac,wav' --enable-decoder='pcm_f32le,pcm_f64le,pcm_s16le,pcm_s
24le,pcm_s32le,pcm_u16le,pcm_u24le,pcm_u32le,pcm_u8,aac,aac_ltm,flac' --enable-p
rotocol='file,pipe' --enable-memalign-hack --disable-pthreads --disable-asm --di
sable-optimizations
  libavutil    50. 39. 0 / 50. 39. 0
  libavcodec   52.113. 2 / 52.113. 2
  libavformat  52.102. 0 / 52.102. 0
  libavdevice  52.  2. 3 / 52.  2. 3
  libavfilter   1. 76. 0 /  1. 76. 0