开源的Ogg

Ogg 为 container format
其他文件后缀为 oga, ogv, ogx, spx

ogg 系列的编解码格式为
* Audio
o Lossy
+ Speex: handles voice data at low bitrates (~8-32 kbit/s/channel)
+ Vorbis: handles general audio data at mid- to high-level variable bitrates (~16-500 kbit/s/channel)
o Lossless
+ FLAC: handles archival and high fidelity audio data
+ OggPCM: The experimental uncompressed PCM audio codec.

* Video
o Lossy
+ Theora: based upon On2's VP3, it is targeted at competing with MPEG-4 video (for example, encoded with DivX or Xvid), RealVideo, or Windows Media Video.
+ Tarkin: an experimental and now obsolete video codec developed in 2000, 2001 and 2002 utilizing discrete wavelet transforms in the three dimensions of width, height, and time.[12][25][26][27] It has been put on hold after Theora became the main focus for video encoding (in August 2002).[28]
o Lossless
+ OggUVS: a draft codec for storing uncompressed video.

* Text
o Writ: a text codec designed to embed subtitles or captions
o Continuous Media Markup Language: a text/application codec for timed metadata, captioning, and formatting
o Annodex: A free and open source set of standards developed by CSIRO to annotate and index networked media.
o OggKate: An overlay codec, originally designed for karaoke and text, that can be multiplixed in Ogg.




Theora is derived from the proprietary VP3 codec, released into the public domain by On2 Technologies.