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07.03.2004 16:31 |
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What is Ogg Vorbis?
This is the first of a four-part series of articles about Ogg Vorbis, a high quality, open source audio compression technology.
What is Ogg Vorbis?
Ogg Vorbis is a professional, high quality compression and streaming technology that aims to replace inferior, proprietary systems. Developed by the Xiph.org Foundation, Ogg Vorbis is completely patent-free, and it enjoys the benefits of open source.
So what's wrong with mp3? Why should Vorbis be used?
Developed in the late 1980s, mp3 was originally part of a larger digital video and audio broadcasting project and was never intended to be used for everyday audio compression. mp3 was not designed with flexibility in mind, and, thus, is technologically limited. Most users and even artists are not aware that mp3 is not free. Fraunhofer owns the mp3 patents and charges royalties for their use.
The Xiph.org Foundation considers this limitation to be unfair and restrictive to an artist's right for expression and to the listeners' right to freely enjoy the work of the artist.
File size in Ogg Vorbis
A large majority of people are under the assumption that an mp3 at 128kps is 'CD-quality.' This bitrate does not accurately reproduce the sound from the original source material. As a matter of fact, no lossy compression algorithm will be able to accurately reproduce that signal. For mp3 to achieve what most people would consider CD-quality sound, it is most often necessary to encode at bitrates of 192kpbs or even higher. Needless to say, this is a significant increase in file size. To enjoy adequate quality audio with mp3, larger files are needed.
With Vorbis, however, there is no need to sacrifice storage space to enjoy high quality audio. Vorbis uses different and improved technology to better compress audio. The result is a file that sounds better than mp3 but that takes up less space. Hence, there is no need to compromise.
Traditionally, quality has been closely related to bitrate. Unfortunately, this is a notion that has evolved and been popularized by mp3 and other encoders where bitrate directly affected quality. Vorbis takes a different approach. Instead of having to deal with specific bitrate settings, Vorbis encoders use a quality setting from zero to ten. This setting determines the final sound quality of the file and its size.
Let's use an example. I took a six-minute track (This Song is Over) from an album by The Who and ended up with a sixty-six meg .wav file. I encoded it at 192kbps with lame, a popular mp3 encoder. The resulting mp3 takes up nine megs of space. I compressed the same wav file and set the Vorbis encoder to quality setting 4.99, a setting that approximates an mp3 encoded at 192kbps. The Vorbis file size is 6.1 megs, a savings of about 30%. There is a clear and immediate benefit from using Vorbis. You save space.
What about quality?
Vorbis has been developed using technologies that were not available at the time mp3 was created. Thus, Vorbis files can better compress your original source material. Not only are high-quality files smaller, but they also sound better. You don't have to worry about specific bitrates and unsatisfactory sound. Vorbis simplifies the process. And best of all, it's free.
Take the Vorbis challenge. Download the software, listen to samples and songs, or make your own .ogg files. You'll find that Ogg Vorbis is a better alternative for your audio needs.
Next week, we will talk about encoding music with Vorbis.
Kurz - es ist sowas wie mp3
Info
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Bigbrother? - never heard of
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07.03.2004 17:27 |
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flitzer
Seepferdchen
Dabei seit: 23.06.2001
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Original von Schlumpfine
Ja, genauso hat er gekuckt, mein Compi... 
Jetzt müsst ich nurnoch rausfinden, warum man nur bis Minute 72 vor- und rückspulen kann und was man dagegen macht, alles was danach kommt, spielt er zwar weiter ab, aber man kann nicht an die Stelle springen, die man braucht, und auf ne CD passt der ganze File auch nicht. Kann man oggen irgendwie in 2 Tracks zerschnippeln oder so, weiß das zufällig jemand? 
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Ich hab mir mal ne ogg Datei erstellt und sie dann mit CD ex zurück in eine mp3 gewandelt. Ich denke, das müsste klappen --> unter Einstellungen kannst du die Bitrate verändern, um mit der Grösse des Files variieren zu können.
download
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15.03.2004 11:40 |
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Ah, danke, dann werd ich mal versuchen zu wandeln. 
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Endlich Nicht-BB-Gucker!
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16.03.2004 15:33 |
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