The Media Object Server (MOS) protocol allows newsroom computer systems (NCS) to communicate using a standard protocol with

video server {{refimprove, date=September 2014 A video server is a computer-based device that is dedicated to delivering video. Video servers are used in a number of applications, and often have additional functions and capabilities that address the needs of p ...

s, audio servers, still stores, and character generators for broadcast production. The MOS protocol is based on

XML Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable ...

. It enables the exchange of the following types of messages: ; Descriptive Data for Media Objects. : The MOS "pushes" descriptive information and pointers to the NCS as objects are created, modified, or deleted in the MOS. This allows the NCS to be "aware" of the contents of the MOS and enables the NCS to perform searches on and manipulate the data the MOS has sent. ; Playlist Exchange. : The NCS can build and transfer playlist information to the MOS. This allows the NCS to control the sequence that media objects are played or presented by the MOS. ; Status Exchange. : The MOS can inform the NCS of the status of specific clips or the MOS system in general. The NCS can notify the MOS of the status of specific playlist items or running orders. MOS was developed to reduce the need for the development of device specific drivers. By allowing developers to embed functionality and handle events, vendors were relieved of the burden of developing device drivers. It was left to the manufacturers to interface newsroom computer systems. This approach affords broadcasters flexibility to purchase equipment from multiple vendors. It also limits the need to have

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in multiple locations throughout the studio as, for example, multiple character generators (CG) can be fired from a single control

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, without needing an operator at each CG console. MOS enables journalists to see, use, and control media devices inside

Associated Press The Associated Press (AP) is an American non-profit news agency headquartered in New York City. Founded in 1846, it operates as a cooperative, unincorporated association. It produces news reports that are distributed to its members, U.S. ne ...

's ENPS system so that individual pieces of newsroom

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technology speak a common

-based language.

History of MOS

The first meeting of the MOS protocol development group occurred at the

ENPS developer's conference in Orlando, Florida in 1998. The fundamental concepts of MOS were released to the public domain at that conference. As an

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, the MOS Development Group encourages the participation of broadcast equipment vendors and their customers. More than 100 companies are said to work with AP on MOS-related projects. Compatible hardware and software includes

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, storage and

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;

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; machine control; prompters; character generators; audio editing, store and management;

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, field transmission and graphics. Current development is happening on two tracks: a socket-based version, and a web service version. The current official versions of the MOS protocol, as of January 2011, are 2.8.4 (sockets) and 3.8.4 (web service). In 2016 proposals began to introduce IP Video support in the MOS protocol. This proposal allows representations of live IP Video sources such as NDI (

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) to be included as MOS objects alongside MOS objects representing files to be played off disk There is also a

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based implementation called jmos that is currently compatible with MOS specification 2.8.2. An open source

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(dialect of

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) MOS connector and MOS Gateway is being actively developed by the Norwegian state broadcaster

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, as part of their open-sourc
Sofie
broadcast automation software initiative. An open source

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library and command line tool called mosromgr was developed by the

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...

History of MOS

References