The publisher MUST publish an independent media timeline in the first MOQT Object of each MOQT Group of a media timeline track. The publisher MAY publish incremental updates in the second and subsequent Objects within each Group. Incremental updates only contain media timeline records since the last media timeline Object.
§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-00 at the IETF.