Vorbis merged an old version of aotuv, latest aotuv is not in vorbis
however.

Also, according to listening tests, opus is known to be better than vorbis in 
every tested scenario, see:
http://jmspeex.livejournal.com/13547.html

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https://bugs.launchpad.net/bugs/57797

Title:
  include aoTuV patch

Status in Medibuntu:
  Invalid
Status in Ogg Vorbis:
  Confirmed
Status in “libvorbis” package in Ubuntu:
  Confirmed
Status in “libvorbis” package in Debian:
  Fix Released

Bug description:
  Would be nice to include aoTuV [1] Release 1 patch to libvorbis. aoTuV is an 
improved libvorbis encoder, that, while keeping ABI compatibility, gives many 
improvement:
  * better quality at all bitrates versus libvorbis-1.1.2 [2], giving aoTuV 
better quality than other codec (AAC, MP3, MPC, WMA, ...) [3];
  * support of quality down to -2 (32kb/s at 44kHz stereo), versus -1 (45kb/s 
at 44kHz stereo) of libvorbis-1.1.x;
  * encoding speed 10% better thanks to the included Vorbis-OptSort patch 
(improve ordering loop);

  aoTuV Release 1 have just been releases. aoTuV Release 1 is the same
  as of beta4.51 (released on 2005-11), renamed after a lot of testing
  of the audio community (especially on hydrogenaudio forum [4]) and
  this is the reccomended vorbis encoder [5].

  [1] aoTuV site: http://www.geocities.jp/aoyoume/aotuv/
  [2] comparison of aoTuV beta 4 vs libvorbis-1.1.x: 
http://wiki.xiph.org/index.php/VorbisEncoders
  [3] Wikipedia test of vorbis vs other codecs: 
http://en.wikipedia.org/wiki/Vorbis#Codec_comparisons
  [4] hydrogenaudio forum: http://www.hydrogenaudio.org
  [5] Recommended Ogg Vorbis: 
http://wiki.hydrogenaudio.org/index.php?title=Recommended_Ogg_Vorbis

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