Networked Media Interface is Sony's solution to IP-based video transmission. Sony started with SMPTE 2022, which was developed for long-haul communications, and made modifications to target Studio Video over IP. NMI packetizes video, audio and metadata separately, enabling real-time transmission and clean switching between video production devices via standard network infrastructures and commercial off the shelf switches.
Benefits of NMI for Video over IP
- Increased flexibility and scalability, using COTS switches and existing IP infrastructure
- Redundant system infrastructure (SMPTE ST2022-7), providing automated fail-over without interruption
- Network based synchronization (SMPTE 2059 PTP), eliminates the need of separate Genlock
- Frame aligned Forward Error Correction compensates for 10-14 bit error rate of fiber
Applications of NMI
- Video over IP communication within a studio for live or post production
- IP based remote production, linking multiple offsite live production through IP
Essence-independent packetization uses packet headers to identify independent streams of video, audio, and metadata to be distributed, extracted, combined, and switched independently. This reduces the network load of sending unnecessary data to specific end devices.
Low Latency Video Codec (LLVC)
NMI leverages Sony's LLVC to compress and transmit live visually lossless 4Kp60 video over single 10GbE link, with compression ratios of 3:1 to 14:1.
Interoperability and Standards
Sony’s IP Live Alliance is a partnership with over 50 industry leading companies to collaborate and ensure multi-vendor interoperability and standardization of live Video over IP in professional media networks. Sony is also a member of Society of Motion Picture and Television Engineers (SMPTE), Alliance for IP Media Solutions (AIMS), Video Service Forum (VSF), Adaptive Sample Picture Encapsulation (ASPEN), and most recently the Advanced Media Workflow Association (AMWA) Networked Media Incubator.
Participation within these groups shows Sony's proactive approach to the adoption of widely supported open-standards to create IP-based interoperability. Sony also validates all endpoints with lab testing to ensure interoperability.
Sony has actually submitted the three key elements of their system to SMPTE for standardization:
- RDD 34: Low Latency Video Codec (LLVC)
- RDD 38: Networked Device Control Protocol (NDCP)
- RDD 40: Networked Media Interface (NMI)
Sony - Sony's Knowledge Portal, IP Live Training
Sony - Hugo Gaggioni presents "IP Networking for Studio and Outside Broadcasting Production Applications" at CCW 2014 (Video)
Sony - Sony's IP Live Production and the Business of Broadcasting Technical Document (.pdf)
Xilinx - Sony's IP Live Production Technology Technical White Paper (.pdf)
June 27, 2016 - TV Technology - Imagine Contributes to Sony’s IP Live Studio
June 17, 2016 - Sony - Sony Joins AMWA Networked Media Incubator
March 17, 2016 - TV News Check - Competing Visions of IP