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CTA 5006

Common Media Server Data
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Adaptive streaming of segmented media is enabled by media players requesting media objects from servers. These servers are arranged in a hierarchy starting with the origin server, which holds the authoritative copy of the content requested by user agents and other servers. Outbound [RFC9110] responses traverse a series of mid-tier and edge intermediaries, known collectively as Content Distribution Networks (CDNs). These CDNs may themselves be stacked. The edge servers are the outermost servers. Edge servers are the first intermediaries to receive user-agent requests, in a given request/response flow, and the last intermediary to forward a response when communicating with media players. The origin servers know information about the media object which the CDN servers do not. For example, they may know the format, the duration and the encoded bitrate of a media object. In the case of live streams, they may know for how long the object has been available and the likely next object in the sequence. The edge servers in turn know information unavailable to the origin or players. For example, they may know the throughput available in the next network hop, or the cache status of the various objects or the accumulated history of the media object as it was moved from origin to edge server. The purpose of the Common Media Server Data (CMSD) specification is to define a standard means by which every media server (intermediate and origin) can communicate data with each media object response and have it received and processed consistently by every intermediary and player, for the purpose of improving the efficiency and performance of distribution and ultimately the quality of experience enjoyed by the users. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.
SDO CTA: Consumer Technology Association
Document Number 5006
Publication Date Nov. 1, 2022
Language en - English
Page Count 22
Revision Level
Supercedes
Committee
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