At its heart, ogg_stream_init is a programming command that initializes a bitstream within the Ogg framework. This is a critical first step for any software that needs to decode or encode audio and video in this format.
Ogg is a container format (RFC 3533) that can encapsulate various codecs: Vorbis (audio), Theora (video), Opus, FLAC, etc. Unlike MP4, Ogg is – it doesn’t require a global header at the end. Ogg Stream Init Download