qdm2 in aiff: fix duration

[ami_stuff]

qt reports 5.52s

​http://ffmpeg.org/trac/ffmpeg/raw-attachment/ticket/204/QDesign2.aif

$ ffmpeg -i QDesign2.aif
ffmpeg version 0.11.1.git-4f92d31 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug 28 2012 14:56:41 with gcc 4.6.1 (GCC)
  configuration: --disable-ffprobe --disable-ffplay --enable-gpl
  libavutil      51. 70.100 / 51. 70.100
  libavcodec     54. 54.100 / 54. 54.100
  libavformat    54. 25.104 / 54. 25.104
  libavdevice    54.  2.100 / 54.  2.100
  libavfilter     3. 13.101 /  3. 13.101
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, aiff, from 'QDesign2.aif':
  Duration: 00:00:00.00, start: 0.000000, bitrate: 24792 kb/s
    Stream #0:0: Audio: qdm2 (QDM2 / 0x324D4451), 11127 Hz, mono, s16, 24 kb/s
At least one output file must be specified

[Carl Eugen Hoyos]

Fixed by you.