Ogg

Ogg is a streamable container created by Monty of Xiph.org. It was initially invented to support the Ogg Vorbis compressed audio format and has since been used by Xiph.org for other media codecs including Speex, FLAC and the Theora video codec.

The Ogg Encapsulation Format Version 0
RFC3533

Abstract

This document describes the Ogg bitstream format version 0, which is
a general, freely-available encapsulation format for media streams.
It is able to encapsulate any kind and number of video and audio
encoding formats as well as other data streams in a single bitstream.