Difference between revisions of "Vorbis"

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=Introduction=
 
=Introduction=
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'''Ogg Vorbis''' ([http://www.vorbis.com www.vorbis.com]) is a fully open, non-proprietary, patent-free <small>(subject to [http://www.hydrogenaudio.org/forums/index.php?showtopic=13531 speculation])</small>, and royalty-free, general-purpose compressed audio format for mid to high quality (8khz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to >256 kbps/channel. This places vorbis in the same competitive class as audio representations such as mpeg-4 ([[AAC]]), and similar to, but higher performance [[MP3]], twinvq ([[VQF]]), [[WMA]] and [[PAC]].
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'''Ogg Vorbis''' ([http://www.vorbis.com www.vorbis.com]) is a fully open, non-proprietary, patent-free <small>(subject to [http://www.hydrogenaudio.org/forums/index.php?showtopic=13531 speculation])</small>, and royalty-free, general-purpose compressed audio format for mid to high quality (8khz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to >256 kbps/channel. This places vorbis in the same competitive class as audio representations such as MPEG-4 ([[AAC]]), and similar to, but higher performance [[MP3]], twinvq ([[VQF]]), [[WMA]] and [[PAC]].
  
 
Vorbis is the first of a planned family of Ogg multimedia coding formats being developed as part of Xiph.org's ogg multimedia project.
 
Vorbis is the first of a planned family of Ogg multimedia coding formats being developed as part of Xiph.org's ogg multimedia project.
  
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Informal listening test suggest Vorbis to be comparable to mpeg-4 [[AAC]] at most bitrates and [[MPC]] at 128kbs. Transparency is generally reached at about 150-170kbps (with some exceptions). The encoder is reasonably young and unoptimized, so further improvements can be expected.
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Informal listening test suggest Vorbis to be comparable to MPEG-4 [[AAC]] at most bitrates and [[MPC]] at 128 kbps. Transparency is generally reached at about -q 5 150-170 kbps (with some exceptions). The encoder is reasonably young and unoptimized, so further improvements can be expected.
  
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Unfortunately, Xiph.org has failed to improve Vorbis at a steady rate since its initial 1.0 release in July 2002. Since then development has been lead by other coders such as Garf and Aoyumi. Aoyumi's AoTuV series of encoders was incorporated into the September 2004 release of 1.1, which brought about the first quality improvements across the board for 2 years.
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Unfortunately, Xiph.org has failed to improve Vorbis at a steady rate since its initial 1.0 release in July 2002 (due to other developement projects and time constraints). Since then development has been lead by other coders such as Garf and Aoyumi. Aoyumi's AoTuV series of encoders was incorporated into the September 2004 release of 1.1, which brought about the first quality improvements across the board for 2 years.
  
  
 
==Pros==
 
==Pros==
 
* Free (as in speech), Open Source and claimed to be patent free
 
* Free (as in speech), Open Source and claimed to be patent free
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* Good all-round performance (>48kbs - a leading codec at 128kbs)
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* Good all-round performance (>48 kbps - a leading codec at 128 kbps)
 
* Well written [http://www.xiph.org/ogg/vorbis/docs.html specs]
 
* Well written [http://www.xiph.org/ogg/vorbis/docs.html specs]
 
* Several portable hardware players
 
* Several portable hardware players

Revision as of 00:41, 19 April 2005

Introduction

Ogg Vorbis (www.vorbis.com) is a fully open, non-proprietary, patent-free (subject to speculation), and royalty-free, general-purpose compressed audio format for mid to high quality (8khz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to >256 kbps/channel. This places vorbis in the same competitive class as audio representations such as MPEG-4 (AAC), and similar to, but higher performance MP3, twinvq (VQF), WMA and PAC.

Vorbis is the first of a planned family of Ogg multimedia coding formats being developed as part of Xiph.org's ogg multimedia project.

Informal listening test suggest Vorbis to be comparable to MPEG-4 AAC at most bitrates and MPC at 128 kbps. Transparency is generally reached at about -q 5 150-170 kbps (with some exceptions). The encoder is reasonably young and unoptimized, so further improvements can be expected.

Unfortunately, Xiph.org has failed to improve Vorbis at a steady rate since its initial 1.0 release in July 2002 (due to other developement projects and time constraints). Since then development has been lead by other coders such as Garf and Aoyumi. Aoyumi's AoTuV series of encoders was incorporated into the September 2004 release of 1.1, which brought about the first quality improvements across the board for 2 years.


Pros

  • Free (as in speech), Open Source and claimed to be patent free
  • Good all-round performance (>48 kbps - a leading codec at 128 kbps)
  • Well written specs
  • Several portable hardware players
  • Suitable for internet-streaming (via Icecast)
  • Fully gapless playback

Cons

  • Limited official development
  • Current implementations are more computationally intensive to encode and decode than MP3
  • Quality at high bitrates could benefit from further tuning

Technologies used in compression

  • Advanced psymodel (based upon ATH model)
  • Coupled stereo modes (point/phase stereo and lossless)
  • Huffman coding
  • Vector quantization
  • Modified discrete cosine transform (MDCT)
  • Multiple block sizes for window switching

Software

Encoders

Decoders

Hardware

The following list contains some players that support Vorbis playback.

External links

The following links contain information surrounding the Ogg Vorbis codec that can be found on Hydrogenaudio and elsewhere throughtout the web.

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