OggUVS is an uncompressed video codec for Ogg, developed by Xiph.Org. Currently, it's still a working draft, but it's intended to be a simple way to store and transfer uncompressed video within an Ogg container. It is similar to projects like OggYUV and OggRGB, and is intended to support both formats.
This format is intended to be used as an interchange format. It is also useful for storing time-synced decoded audio/video, as opposed to using RIFF/WAV and YUV4MPEG in separate files. It is intended to be less complex to use than RIFF/AVI.