Ogg
Updated: 11/16/2019 by Computer Hope
Ogg is an open-source file format for multimedia. It can contain music, video, text, and metadata, and is optimized for streaming content. Because it is Copyright-free, Ogg is available for anyone to use in their software or media projects free of charge.
Ogg is developed by the Xiph.org foundation. It is divided into subformats for different media types, including the following.
| Media Type | Compression Type | Format Name | Specific Use | File Extension |
|---|---|---|---|---|
| Audio | Lossy | Speex | voice data at low bitrates (8-32 Kb/s) | .spx |
| Vorbis | general audio data at medium to high variable bitrates (16-500 Kb/s) | .ogg, .oga | ||
| Opus | voice, music, and generic audio at low to high variable bitrates (16-510 Kb/s) | .opus | ||
| Lossless | FLAC (free lossless audio codec) | archival and high fidelity audio | .flac | |
| Uncompressed | OggPCM | uncompressed PCM (pulse-code modulation) audio, similar to the WAV format | .ogg, .oga | |
| Video | Lossy | Theora | codec similar to MPEG-4, RealVideo, or Windows Media Video | .ogg, .ogv |
| Tarkin | experimental video codec using three-dimensional wavelet transforms (development currently on hold, use Theora instead) | .ogg, .ogv | ||
| Dirac | open format developed by the BBC which uses wavelet transforms | .drc | ||
| Lossless | Dirac | lossless version of the Dirac codec | .drc | |
| Uncompressed | OggUVS | uncompressed video codec | .ogg, .uvs | |
| Text | None | Writ | text for subtitles or captions | .ogg |
| CMML (Continuous Media Markup Language) | text for applications which require timed metadata, captioning, or subtitling | .ogg | ||
| Annodex | used to annotate and index networked media | .ogg | ||
| OggKate | an overlay codec for karaoke systems | .ogg |