DVB Archives – Page 2 of 7 – The Broadcast Knowledge

Video: Multicast ABR opens the door to a new DVB era

Posted on 4th August 2020 by Russell Trafford-Jones

Multicast ABR (mABR) is a way of delivering standard HTTP-based streams like HLS and DASH over multicast. This can be done using an ISP’s managed network to multicast to thousands of homes and only within the home itself does the stream gets converted into unicast HTTP. This allows devices in the home to access streaming services in exactly the same way as they would Netflix or iPlayer, but avoiding strain on the core network. Streaming is a point-to-point service so each device takes its own stream. If you have 3 devices in the home watching a service, you’ll be sending 3 streams out to them. With mABR, the core network only ever sees one stream to the home and the linear scaling is done internally.

Guillaume Bichot from Broadpeak explains how this would work with a multicast server that picks up the streaming files from a CDN/the internet and converts it into multicast. This then needs a gateway at the other end to convert back into multicast. The gateway can run on a set-top-box in the home, as long as multicast can be carried over the last mile to the box. Alternatively, it can be upstream at a local headend or similar.

At the beginning of the talk, we hear from BBC R&D’s Richard Bradbury who explains the current state of the work. Published as DVB Bluebook A176, this is currently written to account for live streaming, but will be extended in the future to deal with video on demand. The gateway is able to respond with a standard HTTP redirect if it becomes overloaded which seamlessly pushes the player’s request directly to the relevant CDN endpoint.

DVB also outlines how players can contact the CDN for missing data or video streams that are not provided, currently, via the gateway. Guillaume outlines which parts of the ecosystem are specified and which are not. For instance, the function of the server is explained but not how it achieves this. He then shows where all this fits into the network stack and highlights that this is protocol-agnostic as far as delivery of media. Whilst they have used DVB-DASH as their assumed target, this could as easily work with HLS or other formats.

Guillaume finishes by showing deployment examples. We see that this can work with uni-directional satellite feeds with a return channel over the internet. It can also work with multiple gateways accessible to a single consumer.

The webinar ends with questions though, during the webinar, Richard Bradbury was answering questions on the chat. DVB has provided a transcript of these questions.

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Speakers

	Richard Bradbury Lead Research Engineer, BBC R&D
	Guillaume Bichot Principal Engineer, Head of Exploration, Broadpeak

Video: Introduction to DVB’s Targeted Advertising specifications

Posted on 23rd July 2020 by Russell Trafford-Jones

Addressable TV is coming to DVB with targetted advertising specifications. Famously Sky has been one of the main driving forces behind addressable TV in Europe. Sky’s AdSmart technology, launched in 2014 has long allowed advertisers large and small to target very specific viewers. In 2017 DVB spotted the need for an interoperable standard for targetted advertising and today we are seeing the results of their work to date. Usually, broadcasters can charge a premium for targetted advertising which brings them on a par with the ability of the large streaming giants to target ads to their customers. Sky has found that personalised commercials result in 21% more engagement and 35% heightened attentiveness.

Addressable TV has been shown to encourage smaller advertisers to use TV for the first time. Whilst creating a professional advert is not cheap, this is played off against the reduced cost of only targetting a small percentage of households. Capitalising on the localisation possible, Macdonalds, for instance, has used targetted advertising to announce new menus in specific branches.

Targetted advertising shows a promising future for growth, so this seems to be a great time for DVB and HbbTV to be jointly producing standard guidance for the industry called DVB-TA.

Martin Gold introduces the DVB-TA Part 1 – Signalling explaining that this specification is currently going through ETSI for standardisation. DVB-TA accounts for signalling from playout to the encoder, to downstream transcoders/multiplexers and to the receivers themselves. The specification focusses on SCTE 35 and where a receiver can’t understand SCTE 35, there is a way to translate these messages to DSM-CC messages for HbbTV devices. SCTE 35 has been extended and includes a unique programme descriptor and also accounts for PTS adjustments.

Matt Poole follows by talking about Part 2 which deals with communication with ad servers. Matt explains how privacy and working within GPDR has been considered throughout this section. He then talks about the importance of carefully matching the video format of the ad inventory with the viewed channel in order to get the most seamless transition possible and be careful to download the correct file type of asset. Matt then talks about the playoff between reach and perfect user experience.

The talk ends with a 20-minute Q&A session which includes panellists Peter Neumann and Angelo Pettazzi.

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Speakers

	Angelo Pettazzi Chair of the DVB Commercial Module working group on Targeted Advertising Consultant at R.T.I. Strategic Marketing, Mediaset Group
	Martin Gold Editor of the DVB-TA signalling specification, Consultant Architect at YouView TV Limited
	Matt Poole Chair of the DVB Technical Module working group on Targeted Advertising, Steering group PMO, HbbTV
	Peter Neumann Platform Solutions Program Distribution, CBC / Mediengruppe RTL

Video: UHD – commercial success or work in progress?

Posted on 15th May 2020 by Russell Trafford-Jones

Where is UHD? Whilst the move to HD for US primetime slots happened very quickly, HD had actually taken many years to gain a hold on the market. Now, though SD services are still numerous, top tier channels all target HD and in terms of production, SD doesn’t really exist. Is UHD successfully building the momentum needed to dominate the market in the way that HD does or are there blockers? Is there the will but not the bandwidth? Can we show that UHD makes financial sense for a business? This video from the DVB Project and UltraHD Forum answers these questions.

Ian Nock takes the mic first and explains the UltraHD Forum’s role in the industry ahead of introducing Dolby’s Jason Power. Ian explains that the UltraHD Forum isn open organisation focused on all aspects of Ultra High Definition including HDR, Wide Colour Gamut (WCG), Next Generation Audio (NGA) and High Frame Rate (HFR). Jason Power is the chair of the DVB Commercial Module AVC. See starts by underlining the UHD-1 Phase 1 and Phase 2 specifications. Phase 1 defines the higher resolution and colour gamut, but phase 2 delivers higher frame rate, better audio and HDR. DVB works to produce standards that define how these can be used and the majority of UHD services available are DVB compliant.

On the topic of available services, Ben Schwarz takes the stand next to introduce the UltraHD Forum’s ‘Service Tracker‘ which tracks the UHD services available to the public around the world. Ben underlines there’s been a tripling of services available between 2018 to 2020. It allows you to order by country, look at resolution (from 2K to 8L) and more. Ben gives a demo and explains the future plans.

Paul Bray focusses on the global television set business. He starts looking at how the US and Europe have caught up with China in terms of shipments but the trend of buying a TV set – on average – an inch larger than the year before, shows little sign of abating. A positive for the industry, in light of Covid-19, is that the market is not predicted to shrink. Rather, the growth that was expected will be stunted. The US replaces TVs more often than other countries, so the share of TVs there which are UHD is higher than anywhere else. Europe still has a large proportion of people who are happy with 32″ TVs due to the size and HD is perfectly ok for them. Paul shows a great graph which shows the UHD Penetration of each market against the number of UHD services available. We see that Europe is notably in the lead and that China barely has any UHD services at all. Though it should be noted that Omdia are counting linear services only.

Graph showing UHD Penetration per geographical market Vs. Number of Linear UHD services in that Market

Graph showing UHD Penetration per geographical market Vs. Number of Linear UHD services.
Graph and Information ©Omdia

The next part of the video is a 40-minute Q&A which includes Virginie Drugeon who explains her work in defining the dynamic metadata that is sent to the receiver so that it can correctly adapt the picture, particularly for HDR, to the display itself. The Q&A covers the impacts of Covid-19, recording formats for delivery to broadcasters, bitrates on satellite, the UltraHD Forum’s foundational guidelines, new codecs within DVB, high frame rate content and many other topics.

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Speakers

	Jason Power Chair of the DVB Commercial Module AVC Working Group Commercial Partnerships and Standards, Dolby Laboratories
	Ben Schwarz Chair of Ultra HD Forum Communication Working Group
	Paul Gray Research Director, Omdia
	Virginie Drugeon Senior Engineer, Digital Standardisation, Panasonic
	Moderator:Ian Nock Chair of the Interoperability Working Group of the Ultra HD Forum Principal Consultant & Founder, Fairmile West

Video: Beam hopping in DVB-S2X

Posted on 16th April 2020 by Russell Trafford-Jones

Beam hopping is the relatively new ability of a satellite to move its beam so that it’s transmitting to a different geographical area every few milliseconds. This has been made possible by the advance of a number of technologies inside satellite which make this fast, constant, switching possible. DVB is harnessing this new capability to more efficiently deliver bandwidth to different areas.

This talk starts off with a brief history of DVB-S2 moving to DVB-S2X and the successes of that move. But we then see that geographically within a wide beam, two factors come in to play: The satellite throughput is limited by the amplifiers and TWTs, plus certain areas within the beam needed more throughput than others. By dynamically pointing a more focused beam using ferrite switches and steerable antennae – to name but two technologies at play – we see that up to 20% of unmet demand could be addressed.

The talk continues with the ESA’s Nader Alagha explaining some of the basics of directing beams talking about moving from cells and clusters (geographical areas) and then how ‘dwell times’ are the amount of time spent at each cell. He then moves on to give an overview of the R&D work underway and the expected benefits.

A little like in older CRT Televisions a little gap needs to be put into the signal to cover the time the beam is moving. For analogue television this is called ‘blanking’, for stellites this is an ‘idle sequence’. Each time a beam hopes, the carrier frequency, bandwidth and number of carriers can change.

Further topics explored are implementing this on geostationary and non-geostationary satellites, connecting hopping strategy to traffic and the channel models that can be created around beam hopping. The idea of ‘superframes’ is detailed where frames that need to be decoded with a very low SNR, the information is spread out and duplicated an number of times. This is supported in beam hopping with some modifications which require some pre-ambles and the understanding of fragmentation of these frames.

The talk closes discussing looking at future work and answering questions from the webinar attendees.

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Speakers

	Nader Alagha Senior Communications Engineer, ESA ESTEC (European Space Research and Technology Centre)
	Peter Nayler Business Manager, EASii IC
	Avi Freedman Director of System Engineering, Satixfy

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