Hydrogenaudio Knowledgebase - User contributions [en]

User:Dev0

2005-05-15T15:34:54Z

Dev0:

Hey, I'm dev0. I like bands that scream and fall over.
Like Hot Cross:

http://www.unshadowed.com/thediaper/pics/hotcross.jpg

Vorbis

2005-05-15T15:23:22Z

Dev0: /* Software */ added oggdropXPd

=Introduction=
'''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.

Informal listening test suggests Vorbis to be comparable to MPEG-4 [[AAC]] at most bitrates and [[MPC]] at 128 kbps. Transparency is generally reached at about 150-170 kbps (-q 5) (with some exceptions). The encoder is reasonably young and unoptimized, so further improvements can always 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 [http://sjeng.org/vorbisgt3.html Garf] and [http://www.geocities.jp/aoyoume/aotuv/ 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. Currently Aoyumi is working on AoTuv Beta 4 and future releases.

==Pros==
* Free (as in speech), Open Source and claimed to be patent free
* Good all-round performance (>48 kbps - a leading codec at [http://www.rjamorim.com/test/multiformat128/results.html 128 kbps])
* Well written [http://www.xiph.org/ogg/vorbis/docs.html specs]
* Several portable [http://wiki.hydrogenaudio.org/index.php?title=Ogg_Vorbis#Hardware hardware players]
* Suitable for internet-streaming (via [http://www.icecast.org/ Icecast] and other methods)
* Fully [[gapless]] playback
* High potential for further tuning

==Cons==
* Limited official development (third-party developement is always encouraged)
* Current implementations are more computationally intensive to encode and decode than MP3 (Vorbis 2.0 seeks to overcome this limitations by slimlining the encoder)
* Quality could benefit from further tuning

=Technologies used in compression=
* Advanced psymodel (based upon [[ATH]] model)
* Coupled stereo modes ([http://us.xiph.org/ogg/vorbis/doc/stereo.html point/phase stereo] and lossless)
* [[Huffman coding]]
* [[Vector quantization]]
* Modified Discrete Cosine Transform ([[MDCT]])
* Multiple block sizes for window switching

=Software=
'''Encoders'''
* [[oggenc]] (Win32/Posix)
* [[oggdropXPd]] (Win32)
* [http://www.saunalahti.fi/cse/foobar2000/foo_vorbisenc.zip foo_vorbisenc] (foobar2000)

'''Decoders'''

* [[ogg123]] for Unix systems (GPL), a very simple to use command-line player.
* [http://qtcomponents.sourceforge.net/ QuickTime Component] (Allows playback in [[QuickTime]]/[[iTunes]])
* [http://corevorbis.corecodec.org/ CoreVorbis] (DirectShow)
* [http://www.illiminable.com/ogg/ illiminable Ogg Directshow Filters] (Also plays Speex, Theora and FLAC)

=Hardware=
The following list contains some players that support Vorbis playback.
* [[iRiver H-Series]]
* [[MPIO H-Series]]
* [[Rio Karma]]
* [[IAudio M3]]
* [[Neuros]]

=External links=
The following links contain information surrounding the Ogg Vorbis codec that can be found on Hydrogenaudio and elsewhere throughtout the web.
* [[Ogg]] (Container)
* [http://en.wikipedia.org/wiki/Vorbis Ogg Vorbis at Wikipedia.]
* [http://www.audiocoding.com/modules/wiki/?page=Ogg+Vorbis Ogg Vorbis at AudioCoding]
* [http://www.rarewares.org/ogg.html Ogg Vorbis binaries at Rarewares. ]
* [http://www.hydrogenaudio.org/show.php/showtopic/13531 Discussion of Vorbis' legal status]
* [http://www.hydrogenaudio.org/forums/index.php?showtopic=15049 Recommended settings thread for encoding with Vorbis.]
* [http://www.geocities.jp/aoyoume/aotuv/ Aoyumi homepage tuned versions of Vorbis 1.1 encoder and current beta binaries.]
* [http://homepage3.nifty.com/blacksword/index_e.htm Archer homepage optimized versions of AoTuV Beta 3 Vorbis encoder and SSE optmizations. ]
* [http://www.xiph.org Xiph.org Foundation]
* [http://wiki.xiph.org/index.php/Bounties Xiph.org Vorbis bounties]

Oggenc

2005-05-15T15:20:57Z

Dev0:

'''Oggenc''' is the official [[Ogg Vorbis]] encoder by the Xiph.org Foundation. Is is part of vorbis-tools.

[http://www.saunalahti.fi/~cse/temp/vorbis-tools-1.1.0-win32.zip Download]

'''Oggenc2''' is an enhanced version of oggenc developed by John33. Features compression from lossless files (Monkeys Audio, LPAC, FLAC, OptimFROG, WavPack and Shorten - requires presence of decoders), and the ability to specify 'padding' in the headers for subsequent insertion of Tags.

[http://www.rarewares.org/ogg.html Download]

License:

* GPL

Supported systems:

* Windows
* Linux/BSD

Oggenc

2005-05-15T15:20:42Z

Dev0: Added oggenc2.

'''Oggenc''' is the official [[Ogg Vorbis]] encoder by the Xiph.org Foundation. Is is part of vorbis-tools.
[http://www.saunalahti.fi/~cse/temp/vorbis-tools-1.1.0-win32.zip Download]

'''Oggenc2''' is an enhanced version of oggenc developed by John33. Features compression from lossless files (Monkeys Audio, LPAC, FLAC, OptimFROG, WavPack and Shorten - requires presence of decoders), and the ability to specify 'padding' in the headers for subsequent insertion of Tags.
[http://www.rarewares.org/ogg.html Download]

License:

* GPL

Supported systems:

* Windows
* Linux/BSD

Hydrogenaudio Knowledgebase:Sandbox

2004-10-12T05:21:19Z

Dev0:

Test 1234!

Hydrogenaudio Knowledgebase:Terms of Service

2004-10-12T05:13:12Z

Dev0: Initial Import

1. All messages express the views of the author, and are not and should not be taken as representative of the official policies of the forum or the views of its staff, unless explicitly stated as such by the authoritative members of the staff.

2. All members, at the staff's discretion, must converse in an acceptable fashion to be allowed the privilege of continued participation.

3. All members must acknowledge and accept that data integrity is not the liability of the Hydrogenaudio staff. Those who do not accept this should not contribute any content whatsoever to the Hydrogenaudio community.

4. The Hydrogenaudio community requires that all members provide a valid email address. This email address will only be used for user account validation and activities directly related to the features of this community, and will never be given to any third party.

5. All members that post to the Hydrogenaudio community must acknowledge and discuss only acceptable topics when starting a new thread. If posting to an already existing thread, they must continue in the vein of discussion that the thread has already manifested; if they wish to change topics, they must start a new thread.

6. All members that create new threads must use a topic title which is understandable and describes the content of the thread properly. Furthermore, all new threads must be started in the correct forum categories, and posted only once -- in the appropriate category -- throughout the entire forum. Double posts will be removed, and threads with inappropriate topics will be moved. A member that continue violates this rule may be subject to administrative action.

7. All members must acknowledge the authority of the staff insofar as administrative actions are concerned. These issues are no longer open for discussion once the staff member has indicated that the matter is closed. Further concerns regarding an action should be communicated via a private message to the staff member, and not repeatedly discussed publicly. Furthermore, once a thread on a particular topic has been closed or removed and indicated as being unacceptable by a staff member, starting a new discussion on the exact same topic will result in administrative action being taken against the poster.

8. All members that put forth a statement concerning subjective sound quality, must -- to the best of their ability -- provide objective support for their claims. Acceptable means of support are double blind listening tests (ABX or ABC/HR) demonstrating that the member can discern a difference perceptually, together with a test sample to allow others to reproduce their findings. Graphs, non-blind listening tests, waveform difference comparisons, and so on, are not acceptable means of providing support.

9. All members must refrain from posting links to -- or information regarding how to obtain -- copyrighted or illegal material. Discussion containing information of how to obtain such material, how to bypass protection methodologies of such material, or how to otherwise violate laws pertaining to such matters will not be tolerated, and participating members may be subject to administrative action.

10. All members must post in English. Content in other languages are allowed as long as full English translations are provided, or otherwise at the discretion of the staff. User profile information (including sigs) in other languages is allowed.

11. All member sigs must be kept brief -- 3 to 4 lines at most. They must also be non-obtrusive, and non-offensive.

12. All members are only allowed to have a single user account with the forums. Members who are found to violate this rule may be subject to immediate banishment or other administrative action.

13. Updates posted in the "News Submissions" forum should be of importance for the community.

Hydrogenaudio Knowledgebase talk:HowTo

2004-10-12T05:06:43Z

Dev0:

Pretty good article, huh?