Question:
What is Ogg Vorbis?
Answer:
Ogg is a patent-free, fully open multimedia bitstream container format designed for efficient streaming and file compression (storage).
The name "Ogg" hence refers to the file format which includes a number of separate independent open source codecs for both audio and video. Files ending in the .ogg extension may be of any Ogg media filetype, and because the format is free, Ogg's various codecs have been incorporated into a number of different free and commercial media players.
Ogg is only a container format. The actual music or video will be stored as a codec inside an Ogg container. Ogg containers may contain mutiple codecs, for example, an audio video file may contain both an audio codec and a video codec.
Ogg can embed the following codecs:
Audio codecs
- lossy
- Speex: handles voice data at low bitrates (~8-32 kbit/s/channel)
- Vorbis: handles general audio data at mid- to high-level bitrates (~16-256 kbit/s/channel)
- lossless
- FLAC: handles archival and high fidelity audio data
Text codec
- Writ: a text codec designed to embed subtitles or captions
Video codecs
- Theora: based upon On2's VP3, it is targeted at competing with MPEG-4 video (i.e. DivX and XviD), RealVideo, or Windows Media Video.
- Tarkin: an experimental codec utilizing 3D wavelet transforms. It has been put on hold, with Theora becoming the main focus for video encoding.
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