Vorbis Encoders

Vorbis-OptSort: This patch improves source code of the Vorbis codec library (libvorbis-1.0) to accelerate encoding time about 10% (not apply clean on 1.1.1).
AoTuV beta4.51 encoder: Optimized encoder for higher quality and lower bitrate down to 32 Kb/s (q-2). AoTuV beta2 was adopted as a part of Vorbis 1.1 of Xiph.Org. Note that this patch also include the Vorbis-OptSort patch. Quality test of AoTuV beta4 vs. libvorbis 1.1.1:
- 80Kbps comparison of many audio codec and libvorbis 1.1.1 vs. AoTuV beta4
  - libvorbis 1.1.1 ABR vs libvorbis 1.1.1 VBR vs AoTuV beta4 VBR summary
- 96Kbps comparison of many audio codec and libvorbis 1.1.1 vs. AoTuV beta4 (french)
  - Google traduction
  - libvorbis 1.1.1 vs AoTuV beta4 summary
Optimized Ogg Vorbis Encoders: these are highly optimized encoders developed by the Ogg Vorbis Acceleration Project that are much faster than the standard builds with negligible to no effects on audio quality.