Advanced application of NMOS specifications for resource sharing in IP production systems and studio design

At NHK, the first IP studio adopting SMPTE ST 2110 standards was set up in the NHK Hiroshima Broadcasting Station in March 2023. In addition, seven IP studios will be set up in NHK's new Tokyo office complex scheduled to be open in 2026, and the plan there is to improve the equipment utilization rate through resource sharing of cameras, video servers, subtitle system, etc. among those studios. We have developed the following three elemental technologies that are needed for resource sharing. — 1. Each studio must receive and control only the resources that can be used for program production. To allocate exclusive NMOS IS-05 control of a media stream, we developed a mechanism to re-register any shared resources registered in the primary Registration & Discovery System (RDS) in the secondary RDS attached to each sub-control room. This makes it possible to reference (IS-04) and control (IS-05) only registered resources from each studio's controller. — 2. In the new IP studios, the resolution of the video stream should be switchable between 2K or 4K according to the program. To dynamically control switch bandwidth, we developed an application that references Session Description Protocol (SDP) to enter each multicast flow and bandwidth into a database and that dynamically rewrites the Non-Blocking Multicast (NBM) table of a Cisco network switch. This enables dynamic bandwidth control in accordance with changes in device resolution (4K/2K) = bit rate. — 3. Longitudinal Time Code (LTC) is important for searching edit points of multiple materials, though it may not be synchronized appropriately in an IP-based system. We developed a mechanism for adding an appropriate amount of delay based on the combination of ancillary data (ST 2110-40), video (ST 2110-20), and audio (ST 2110-30). This enables the timing of video and audio streams to be dynamically adjusted in an IP system in which each path has a different delay.

Published

2023-10

Content type

Original Research

Keywords

NMOS, resource sharing, multi-vendor system, access management, exclusive control, bandwidth control, Non-Blocking Multicast, lip sync

DOI

10.5594/M002004

ISBN

978-1-61482-964-5