https://wiki.xiph.org/api.php?action=feedcontributions&user=Matc&feedformat=atomXiphWiki - User contributions [en]2024-03-29T05:49:42ZUser contributionsMediaWiki 1.40.1https://wiki.xiph.org/index.php?title=TheoraDecoders&diff=1723TheoraDecoders2005-09-05T20:13:53Z<p>Matc: </p>
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<div>* [http://theora.org/ xiph]<br />
* [http://ffmpeg.org ffmpeg] (only vp3 features, mmx, sse2 optimisations)</div>Matchttps://wiki.xiph.org/index.php?title=FLACDecoders&diff=3147FLACDecoders2005-09-05T20:13:25Z<p>Matc: </p>
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<div>* [http://flac.sourceforge.net/ xiph]<br />
* [http://ffmpeg.org ffmpeg]</div>Matchttps://wiki.xiph.org/index.php?title=Vorbis_Decoders&diff=3145Vorbis Decoders2005-09-05T20:12:38Z<p>Matc: </p>
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<div>* [http://vorbis.com/ xiph]<br />
* [http://ffmpeg.org ffmpeg]</div>Matchttps://wiki.xiph.org/index.php?title=FLACDecoders&diff=1669FLACDecoders2005-09-05T20:11:35Z<p>Matc: </p>
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<div>* [http://ffmpeg.org ffmpeg]</div>Matchttps://wiki.xiph.org/index.php?title=FLAC&diff=3032FLAC2005-09-05T20:11:14Z<p>Matc: </p>
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<div>'''FLAC''' stands for '''Free Lossless Audio Codec'''. FLAC is an [[audio compression]] [[codec]] that is [[lossless data compression|lossless]]. Unlike [[lossy data compression|lossy]] codecs such as [[MP3]] and [[Vorbis]], it does not remove any information from the audio stream.<br />
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On January 29th, 2003, Xiphophorus (now called the [[Xiph.org Foundation]]) announced the incorporation of FLAC under their xiph.org banner, to go along with [[Ogg]] Vorbis, Ogg [[Theora]], and [[Speex]].<br />
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== The Project ==<br />
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The FLAC project consists of: <br />
* the stream format <br />
* libFLAC, a library of reference encoders and decoders, and a metadata interface <br />
* libFLAC++, an object wrapper around libFLAC <br />
* flac, a command-line wrapper around libFLAC to encode and decode .flac files <br />
* metaflac, a command-line metadata editor for .flac files <br />
* input plugins for various music players ([[Winamp]], [[XMMS]], Foobar2000, and more in the works) <br />
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"Free" means that the specification of the stream format is in the [[public domain]] (the FLAC project reserves the right to set the FLAC specification and certify compliance), and that neither the FLAC format nor any of the implemented encoding/decoding methods are covered by any patent. It also means that the sources for libFLAC and libFLAC++ are available under Xiph.org's [[BSD license]] and the sources for flac, metaflac, and the plugins are available under the [[GPL]].<br />
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== Comparisons ==<br />
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FLAC is distinguished from general lossless algorithms such as [[ZIP file format|ZIP]] and [[gzip]] in that it is specifically designed for the efficient packing of audio data; while ZIP may compress a CD-quality audio file 20&ndash;40%, FLAC achieves compression rates of 30&ndash;70%. <br />
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While lossy codecs can achieve ratios of 80&ndash;90+%, they do this at the expense of discarding data from the original stream. Though FLAC uses a similar technique in its encoding process, it also adds "residual" data to allow the decoder to restore the original waveform flawlessly.<br />
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FLAC has become the preferred lossless format for trading live music online. It has a smaller file size than [[Shorten]], and unlike MP3, it's lossless, which ensures the highest fidelity to the source material, which is important to live music traders. It has recently become a favorite trading format of non-live lossless audio traders as well.<br />
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FLAC compiles on many platforms: most [[Unix|Unices]] (including [[Linux]], *[[BSD]], [[Solaris Operating Environment|Solaris]], and [[Mac OS X]]), [[Microsoft Windows|Windows]], [[BeOS]], and [[OS/2]]. There are build systems for [[autoconf]]/[[automake]], MSVC, Watcom C, and Project Builder.<br />
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== More information ==<br />
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* [[FLACDecoders]]: List of decoders<br />
* [[FLACEncoders]]: List of encoders<br />
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== Non-PC playback support ==<br />
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FLAC is supported by a wide range of devices such as:<br />
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* Rio Karma http://www.digitalnetworksna.com/rioaudio/<br />
* iAudio http://www.iaudio.com<br />
* PhatNoise Phatbox<br />
* PhatNoise Home Media Player<br />
* Kenwood Music Keg<br />
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== External links ==<br />
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*[http://flac.sourceforge.net/ Project homepage]<br />
*[http://mikewren.com/flac/ Unofficial FLAC installer for Windows]<br />
*[http://www.danrules.com/macflac/ MacFLAC] [[GUI]] frontend to encode/decode FLAC on [[Mac OS X]]<br />
*[[Wikipedia: FLAC]]</div>Matchttps://wiki.xiph.org/index.php?title=TheoraDecoders&diff=1670TheoraDecoders2005-09-05T20:07:30Z<p>Matc: </p>
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<div>* [http://ffmpeg.org ffmpeg] (only vp3 features, mmx, sse2 optimisations)</div>Matchttps://wiki.xiph.org/index.php?title=Theora&diff=1710Theora2005-09-05T20:05:09Z<p>Matc: </p>
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<div>'''Theora''' is our video codec, based on the VP3 codec donated by [[On2 Technologies]]. We've refined and extended it, giving it the same future scope for encoder improvement [[Vorbis]] has. See http://theora.org/ for more information.<br />
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== Status ==<br />
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Alpha 5 is the latest release. The bitstream format is frozen. Every file created with the alpha 3 encoder (and, of course, later encoders) will be playable with future decoders. Beta 1 will be the next release.<br />
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It would be nice if somewhere it could be explained if Theora is a format appropriate for editing video - such formats would not do frame to frame compression and the file size and processor load would be smaller. On the other hand a distribution format would want to pack in a lot of compression which would mean using frame to for compression.<br />
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== Development ==<br />
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* [[Theora:Beta1ToDo|Todo for Beta1]]<br />
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== More information ==<br />
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* [[TheoraHardware]]: List of hardware-players supporting Ogg Theora<br />
* [[TheoraSoftwarePlayers]]: List of media players that can play Ogg Theora<br />
* [[TheoraDecoders]]: List of decoders<br />
* [[TheoraEncoders]]: List of encoders<br />
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== External links ==<br />
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* [http://www.theora.org/ Theora homepage]<br />
* [http://www.annodex.net/software/theora/ Theora documentation daily builds]<br />
* [[Wikipedia: Theora]]<br />
* [http://www.vp3.com VP3 homepage]: The homepage of the codec Theora is based on<br />
* [http://www.on2.com On2 Technologies]: The creators of VP3</div>Matchttps://wiki.xiph.org/index.php?title=Vorbis_Decoders&diff=1668Vorbis Decoders2005-09-05T20:02:31Z<p>Matc: </p>
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<div>* [http://ffmpeg.org ffmpeg]</div>Matc