With IP Carriage of Video streams becoming ever more prevalent – we take two short presentations covering important aspects of Video Audio and metadata over IP.
- Broadcast Timing, Genlock and Time Code in the Multi Format Network Age
- IP Live Production
These were first presented at IBC 14 but are updated as work in this field is moving fast - and these set the scene very well and show what has been done and what is being worked on as we move to the standards required for a Totally IP World Read the papers in the March edition of Motion Imaging Journal
We thank Semtech for providing the venue and refreshments
– all part of SMPTE UK ain to “meet where people work”.
Broadcast Timing, Genlock and Time Code in the Multi Format Network Age – Nigel Seth Smith
A typical video production facility supports video at SD, HD, 2K and even 4K/UHD1, at a selection of frame rates. The audio is multi-channel, with strict requirements for channel synchronisation.
Currently this is all held together by an analogue PAL or NTSC genlock signal – often the only analogue signal in the entire facility.
Beside synchronization these new TV and film formats also require an improved mechanism for time code. Current time code was only designed to work up to 40 frames per second, and has had to be extended for frame rates up to 80. With 100, 120 (and may be more) coming very soon, the media industries need to adopt a new approach.
The IT industry has a solution: IEEE-1588, the Precision Timing Protocol (PTP) can distribute time via IP and Ethernet with a high degree of accuracy, and with global synchronisation.
Signals locked to PTP will have the same timing wherever it is in the world. All video formats, audio and metadata, are automatically aligned with a defined and consistent phase relationship. Time labels can have nanosecond precision, and be referenced to a common epoch.
This presentation looks at how PTP works, and how it can be used to serve our specific needs, including the application of time code to the new formats and frame rates. We will hear about the latest SMPTE standardisation status and the background to the broadcast specific choices for the profile.
IP Live Production – Paul Gardiner
A dedicated Serial Digital Interface (SDI) infrastructure has been a fundamental building block for video and audio communications within studios and OB trucks for many years. Meanwhile, the bandwidth of generic IP networks has continued to increase alongside falling costs, such that 10 Gbps physical layer infrastructure is now commonly available.
Exploiting this high-bandwidth commodity infrastructure, a single flexible configurable IP network could be deployed in the studio to
support real-time video, audio and control transfers,
support file-based media transfers,
configure, diagnose, monitor and upgrade production equipment on the network
ease the integration of IT-based equipment such as servers together with traditional production equipment such as system cameras.
The presentation will explore the technical requirements and present the design considerations for a practical approach to IP Live Production in the studio designed to deliver significant customer and business benefit compared to the current SDI technology whilst retaining current SDI-based production practices.
Nigel Seth Smith is a strategic technology manager at Semtech, with responsibility for video product definition and standards support.
He first digitized a video signal in 1977 at the IBA. Since then he has been working with pictures, and the numbers which represent them, in Canada and the UK, with Link Electronics, Scientific Atlanta, DPS, Snell & Wilcox and now Semtech.
His current standards work concerns UHDTV transport and network based genlock timing.
Paul Gardiner is Standards Manager at Sony Broadcast & Professional Research Labs within Sony Europe Ltd, based in Basingstoke.
He studied Electronic Engineering at the University of Southampton before joining the Independent Broadcasting Authority (IBA) in 1974, and subsequently became Head of Technical Standards & Information at the Independent Television Commission (ITC). His career has included television technical regulation and R&D project management with responsibility for a number of international collaborative research projects.
Since joining Sony in 2007, he has been actively involved in the SMPTE standards community. Paul is Co-Chair of Technology Committee 10E (Essence) and is a SMPTE Fellow.
Read about SMPTE extensive work in this field
In the report from the Technology Committee Sept14
And in the Technical committee reports over the past years
And of course the ST 2022 family of standards for Video over IP and ST 2059 on synchronisation and time labelling....
How to get to Semtech
Semtech UK, Limited
Units 2-3 Park Court, Premier Way,
Abbey Park Industrial Estates
Semtech is located on an Industrial Estate to the south east of Romsey just off the A27 with ample car parking
From the North – M3 - at junction 14 (M27) – take the A33 – from either fork – and at the Chilworth Roundabout turn back on yourself – keep in the left lane on to the A27 Signpost Romsey
After about 4 miles turn left at the roundabout Signpost Abbey Park Industrial estate - drive along Premier way for just under 400m Park Court is one site away from the A27 at the far end it is the left just past the last road on the right!
From the South M271 or East / West M 27 Junction 3 Head North on M271 Signpost Romsey – at end of motorway roundabout veer left onto the A3070 – just over 2 miles at roundabout turn Right onto A27 Signpost North Baddersley
After just over ½ mile turn Right signposted Abbey Park Industrial east – there is a turn right lane (and the bus goes off to the left!) - Park Court is the second building on the right, just before the road off to the left.
Public Transport from Central Southampton take the W1 Bus at 17:42 from Southampton City Centre, Above Bar (stop AE) to Whitenap, Montfort Road (NW-bound) - this is just north of the roundabout – walk back to the roundabout cross the A27 and walk along Premier Drive
Or Train to Romsey and then about a 35 minute walk
(After the meeting it is hoped that Members can give lifts to Romsey Station or Southampton)
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