Vorbis Encoders

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== Vorbis-OptSort ==
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[http://www.geocities.com/Area51/Dungeon/6809/vorbis-optsort-en.html Vorbis-OptSort] improves source code of the Vorbis codec library (libvorbis-1.0) to accelerate encoding time about 10% (not apply clean on 1.1.2).
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== AoTuV ==
 
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[http://www.geocities.jp/aoyoume/aotuv/ AoTuV encoders] are optimized encoders for higher quality.
 
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* AoTuV beta2 was adopted as a part of Vorbis 1.1 of Xiph.Org.
 
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* AoTuV beta4 improved quality at all bitrates (versus xiph.org 1.1.2) and can also go down to 32 Kb/s (q-2). Note that this patch also include the [http://www.geocities.com/Area51/Dungeon/6809/vorbis-optsort-en.html Vorbis-OptSort] patch.
 
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* The latest release is AoTuV beta 4.51, which improves quality at q<3 (versus AoTuV beta4).
 
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* The latest [http://www.geocities.jp/aoyoume/aotuv/test.html test release] is aoTuV pre-beta5 [20060321].
 
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Quality test of AoTuV beta4 vs. libvorbis 1.1.1:
 
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* [http://www.hydrogenaudio.org/forums/index.php?showtopic=35438 80Kbps comparison of many audio codec and libvorbis 1.1.1 vs. AoTuV beta4]
 
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** libvorbis 1.1.1 ABR vs libvorbis 1.1.1 VBR vs AoTuV beta4 VBR summary:
 
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:: http://audiotests.free.fr/tests/2005.07/80/80TEST_PLOTS_04.png
 
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  "  on group1, all encoders are tied (although aoTuV is better than 1.1.1
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  with 90% confidence). It’s a disappointment for me, because I’ve seriously
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  expected from aoTuV to reduce the level of coarseness/fatness on this specific
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  musical genre. However, slight improvements were often perceptible – it’s
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  better than nothing. With some samples, a slight regression was also perceptible:
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  additional distortion or apparently restrictive lowpass (noticed with harpsichord).
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  Interesting to note that ABR doesn’t perform badly, except on critical samples
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  (bitrate stayed at ~85 kbps when VBR encodings reached 160!); ABR also sounded a
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  bit better with some samples (tonal one). Good point to ABR (just note that encoding
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  speed is dramatically slow compared to VBR).
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    on group 2, differences are much more defined. ABR appeared as clearly worse than
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  VBR and aoTuV beta 4 outdid 1.1.1 on VBR mode. Obviously, the changes Aoyumi made on
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  vorbis are much more effective on various music.
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    on average, aoTuV beta 4 was better than 1.1.1 (not a surprise I would say)."
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  "Vorbis (aoTuV beta 4, VBR –q 0,9): this is by far the most
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  enjoying thing I’ve heard at this bitrate. I was highly surprised
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  by results I’ve got with the 150 classical samples; I was literally
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  astonished by the final score obtained with the 35 remaining samples!
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  Vorbis is obviously an amazing tool at this bitrate." guruboolez
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* [http://forum.hardware.fr/hardwarefr/VideoSon/MP3-WMA-AAC-OGG-qualite-kbps-evaluation-sujet-84950-1.htm 96Kbps comparison of many audio codec and libvorbis 1.1.1 vs. AoTuV beta4 (french)]
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** [http://translate.google.com/translate?u=http%3A%2F%2Fforum.hardware.fr%2Fhardwarefr%2FVideoSon%2FMP3-WMA-AAC-OGG-qualite-kbps-evaluation-sujet-84950-1.htm&langpair=fr%7Cen&hl=it&ie=UTF-8&oe=UTF-8&prev=%2Flanguage_tools  Google traduction]
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** libvorbis 1.1.1 vs AoTuV beta4 summary:
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:: http://audiotests.free.fr/tests/2005.07/96/96TEST_PLOTS_04.png
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* [http://www.hydrogenaudio.org/forums/index.php?showtopic=36465 180Kbps comparison of many audio codec on classical music]
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: Comment on AoTuV beta 4:
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  "Vorbis: Vorbis is now –thanks to Aoyumi– an excellent audio format for 180
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  kbps encodings (and classical music). It has apparently no flaws (lowest note
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  was 3.5) but only minor problems audible from time to time: additional noise,
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  fatness, or softened details. One third of the tested samples are transparent
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  to my ears with aoTuV encodings. My own limits are close to be reached."
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    guruboolez
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  "Vorbis: Vorbis is now impressive. Last year constant noise boost or coarseness
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  spoiled the performance of this format. I was surprised to hear those problems
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  on –q6,00 setting supposed to be free of them due to lossless coupling. Aoyumi has
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  apparently identifies precisely the cause of this problem and he worked to solve it.
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  Not entirely though: some remaining trails are still audible with few samples but
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  the intensity is now really frail (at least on the tested samples). Other artifacts
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  are also corrected: micro-attacks on Orion_II (sample 09) are now much less dusty
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  (aoTuV performed even better than any other tested format at this bitrate!). Performance
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  are remarkable and the slightly gain in bitrate consumption is the icing on the cake.
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  Just a question: Does aoTuV mean Tuned for Victory? Or Tuned by Visitors? From what
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  planet is Aoyumi coming from? By the way, I wouldn’t say anymore than Vorbis is not
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  mature enough. At least not for classical, which appeared to be a weak point for this format"
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    guruboolez
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== Optimized Ogg Vorbis Encoders ==
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[http://www.customsoftwarenow.com custom software development]
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These encoders 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.
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* [http://homepage3.nifty.com/blacksword/index.htm Home page (Japan)]
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Revision as of 11:28, 7 July 2006


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