Ogg
Open container format maintained by the Xiph.Org Foundation / From Wikipedia, the free encyclopedia
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Ogg is a free, open container format maintained by the Xiph.Org Foundation. The authors of the Ogg format state that it is unrestricted by software patents[3] and is designed to provide for efficient streaming and manipulation of high-quality digital multimedia. Its name is derived from "ogging", jargon from the computer game Netrek.[4]
| Filename extension |
.ogg, .ogv, .oga, .ogx, .ogm, .spx, .opus |
|---|---|
| Internet media type |
video/ogg, audio/ogg, application/ogg |
| Magic number | OggS |
| Developed by | Xiph.Org Foundation |
| Initial release | May 2003; 20 years ago (2003-05) |
| Type of format | Container format |
| Container for | Vorbis, Theora, Speex, Opus, FLAC, Dirac, and others. |
| Open format? | Yes |
| Free format? | Yes[1] |
| |
| Developer(s) | Xiph.Org Foundation |
|---|---|
| Initial release | 22 September 2004; 19 years ago (2004-09-22) |
| Stable release | 1.3.5
/ 4 June 2021; 2 years ago (2021-06-04) |
| Type | Reference implementation (multiplexer/demultiplexer) |
| License | BSD-style license[2] |
| Website | downloads |
The Ogg container format can multiplex a number of independent streams for audio, video, text (such as subtitles), and metadata.
In the Ogg multimedia framework, Theora provides a lossy video layer. The audio layer is most commonly provided by the music-oriented Vorbis format or its successor Opus. Lossless audio compression formats include FLAC, and OggPCM.
Before 2007, the .ogg filename extension was used for all files whose content used the Ogg container format. Since 2007, the Xiph.Org Foundation recommends that .ogg only be used for Ogg Vorbis audio files. The Xiph.Org Foundation decided to create a new set of file extensions and media types to describe different types of content such as .oga for audio only files, .ogv for video with or without sound (including Theora), and .ogx for multiplexed Ogg.[5]
As of November 7, 2017, the current version of the Xiph.Org Foundation's reference implementation is libogg 1.3.3.[6] Another version, libogg2, has been in development, but is awaiting a rewrite as of 2018.[7] Both software libraries are free software, released under the New BSD License. Ogg reference implementation was separated from Vorbis on September 2, 2000.[8]
Because the format is free, and its reference implementation is not subject to restrictions associated with copyright, Ogg's various codecs have been incorporated into a number of different free and proprietary media players, both commercial and non-commercial, as well as portable media players and GPS receivers from different manufacturers.