Catalogs can contain significant redundancy, particularly when initialization data is included. To reduce payload size, catalog objects MAY be compressed using the MSF_COMPRESSION property (Section 12.1). If all catalog objects are compressed, the track property (Section 12.1.1) is used. If only some catalog objects are compressed (for example, the complete catalog is compressed while delta updates are not), the object property (Section 12.1.2) is used on each compressed object.
§5.5
Catalog Compression
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.