Ogg Vorbis I format specification: embedding Vorbis into an Ogg stream

Last update to this document: July 14, 2002


This document describes using Ogg logical and physical transport streams to encapsulate Vorbis compressed audio packet data into file form.

_Ogg Vorbis I format specification: high-level description_ provides an overview of the construction of Vorbis audio packets.

The _Ogg bitstream overview_ and Ogg logical bitstream and framing spec_ provide detailed descriptions of Ogg transport streams. This specification document assumes a working knowledge of the concepts covered in these named backround documents. Please read them first.


The Ogg/Vorbis I specification currently dictates that Ogg/Vorbis streams use Ogg transport streams in degenerate, unmultiplexed form only. That is: This is not to say that it is not currently possible to multiplex Vorbis with other media types into a multi-stream Ogg file. At the time this document was written, Ogg was becoming a popular container for low-bitrate movies consisting of DiVX video and Vorbis audio. However, a 'Vorbis I audio file' is taken to imply Vorbis audio existing alone within a degenerate Ogg stream. A compliant 'Vorbis audio player' is not required to implement Ogg support beyond the specific support of Vorbis within a degenrate ogg stream (naturally, application authors are encouraged to support full multiplexed Ogg handling).

MIME type

The correct MIME type of any Ogg file is application/x-ogg. However, if a file is a Vorbis I audio file (which implies a degenerate Ogg stream including only unmultiplexed Vorbis audio), the mime type audio/x-vorbis is also allowed.


Ogg encapsulation of a Vorbis packet stream is straightforward.

Ogg is a Xiph.org Foundation effort to protect essential tenets of Internet multimedia from corporate hostage-taking; Open Source is the net's greatest tool to keep everyone honest. See About the Xiph.org Foundation for details.

Ogg Vorbis is the first Ogg audio CODEC. Anyone may freely use and distribute the Ogg and Vorbis specification, whether in a private, public or corporate capacity. However, the Xiph.org Foundation and the Ogg project (xiph.org) reserve the right to set the Ogg Vorbis specification and certify specification compliance.

Xiph.org's Vorbis software CODEC implementation is distributed under a BSD-like license. This does not restrict third parties from distributing independent implementations of Vorbis software under other licenses.

Ogg, Vorbis, Xiph.org Foundation and their logos are trademarks (tm) of the Xiph.org Foundation. These pages are copyright (C) 1994-2002 Xiph.org Foundation. All rights reserved.