Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | Ogg Vorbis Audio Format |
|---|---|
| Description | Bitstream encoding and file format designed for efficient distribution of sound files over moderate bandwidth connections; Vorbis encoding may be used at higher data rates for better fidelity. |
| Production phase | Generally used for final-state, end-user delivery. |
| Relationship to other formats | |
| Subtype of | Ogg, Ogg File Format |
| Contains | Vorbis_I, Vorbis Audio Codec, Version I |
| LC experience or existing holdings | None. |
|---|---|
| LC preference | General preference for recorded sound masters is WAVE_LCPM. For lossless compressed sound, future explorations will consider possible acceptance for FLAC_1_1_2 and/or Ogg_FLAC. For lossy compressed sound (e.g., for Web delivery to endusers), AAC_M4A or MP3_FF are preferred. |
| Disclosure | Fully documented. Developed by xiph as an open source and patent-free project. |
|---|---|
| Documentation | Menu of relevant Xiph documents. See also Ogg and Vorbis_I. |
| Adoption | Applications include streaming broadcasts ("oggcasts") and computer games. Recorded books in this format are offered by Telltale Weekly. Additional note: In August 2007, one specialist in the field reported that the Web Hypertext Application Technology Working Group, promoters of improved HTML implementations, has endorsed the use of xiph specifications, especially Vorbis and Theora, for the video element. According to this source, "This means that user agents will have the Ogg libraries native, and that external codecs or plugins won't be required for end user playback. I'm hoping the audio element will also have Ogg support by default." Comments welcome. |
| Licensing and patents | None. |
| Transparency | See Vorbis_I |
| Self-documentation | See Ogg and Vorbis_I. |
| External dependencies | Surround sound requires appropriate amplifier and loudspeakers or headphone. |
| Technical protection considerations | None known to the compilers of this document. |
| Sound | |
|---|---|
| Normal rendering | Good support. |
| Fidelity (high audio resolution) | See Vorbis_I. |
| Multiple channels | See Vorbis_I. |
| Support for user-defined sounds, samples, and patches | See Vorbis_I. |
| Functionality beyond normal rendering | See Vorbis_I and Ogg. |
| Tag | Value | Note |
|---|---|---|
| Filename extension | ogg |
From The File Extension Source. |
| Internet Media Type | application/ogg |
From http://www.vorbis.com/faq/. |
| Internet Media Type | audio/x-ogg application/x-ogg |
From The File Extension Source. |
| Magic numbers | See note. | See Ogg. |
| General | |
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| History |
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