ogv for video with or without sound (including Theora), and. The Xiph.Org Foundation decided to create a new set of file extensions and media types to describe different types of content such as. ogg only be used for Ogg Vorbis audio files. Since 2007, the Xiph.Org Foundation recommends that. ogg filename extension was used for all files whose content used the Ogg container format. Lossless audio compression formats include FLAC, and OggPCM. The audio layer is most commonly provided by the music-oriented Vorbis format or its successor Opus. In the Ogg multimedia framework, Theora provides a lossy video layer. The Ogg container format can multiplex a number of independent streams for audio, video, text (such as subtitles), and metadata.

Its name is derived from 'ogging', jargon from the computer game Netrek. The authors of the Ogg format state that it is unrestricted by software patents and is designed to provide for efficient streaming and manipulation of high-quality digital multimedia. Ogg is a free, open container format maintained by the Xiph.Org Foundation.

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