https://gitlab.xiph.org/xiph/theora/-/blob/master/doc/draft-ietf-avt-rtp-theora-00.txt?ref_type=heads
theora video codec reference implementation
docdraftietfavtrtp
https://gitlab.xiph.org/xiph/liboggz
A library and tools for working with Ogg encapsulation, with support for seeking, chopping and validation. http://www.xiph.org/oggz/
xiphorggitlab