The publisher MUST publish an independent media timeline in the first MOQT Object of each MOQT Group of a media timeline track. An independent media timeline object MUST contain all media timeline records accumulated and accessible up to that point, allowing a subscriber joining at any group boundary to receive the accessible timeline history. The publisher MAY publish incremental updates in the second and subsequent Objects within each Group. Incremental updates contain only new media timeline records since the previous media timeline Object in that Group.
§7.3
Media Timeline track updating
This is one section of MOQT Streaming Format, rendered per-section for quick reference and citation. The authoritative text is draft-ietf-moq-msf-01 at the IETF.