- 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:
"Vorbis (aoTuV beta 4, VBR –q 0,9): this is by far the most
enjoying thing I’ve heard at this bitrate. I was highly surprised
by results I’ve got with the 150 classical samples; I was literally
astonished by the final score obtained with the 35 remaining samples!
Vorbis is obviously an amazing tool at this bitrate." guruboolez
"Vorbis: Vorbis is now –thanks to Aoyumi– an excellent audio format for 180
kbps encodings (and classical music). It has apparently no flaws (lowest note
was 3.5) but only minor problems audible from time to time: additional noise,
fatness, or softened details. One third of the tested samples are transparent
to my ears with aoTuV encodings. My own limits are close to be reached."
"Vorbis: Vorbis is now impressive. Last year constant noise boost or coarseness
spoiled the performance of this format. I was surprised to hear those problems
on –q6,00 setting supposed to be free of them due to lossless coupling. Aoyumi has
apparently identifies precisely the cause of this problem and he worked to solve it.
Not entirely though: some remaining trails are still audible with few samples but
the intensity is now really frail (at least on the tested samples). Other artifacts
are also corrected: micro-attacks on Orion_II (sample 09) are now much less dusty
(aoTuV performed even better than any other tested format at this bitrate!). Performance
are remarkable and the slightly gain in bitrate consumption is the icing on the cake.
Just a question: Does aoTuV mean Tuned for Victory? Or Tuned by Visitors? From what
planet is Aoyumi coming from? By the way, I wouldn’t say anymore than Vorbis is not
mature enough. At least not for classical, which appeared to be a weak point for this format"
- 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.