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Video: ST 2110 Test and Measurement Super Session

Posted on 2nd October 2019 by Adam K

This IP Showcase super session consists of six presentation from six different vendors which focus on specific aspects of test or measurement that is unique for ST 2110 environment. It is worth noting that these are technology presentations, not product presentations.

The session is led by Willem Vermost from EBU. He describes what kind of issues we need to solve in a SMPTE ST 2110 environment in terms of testing and monitoring. He speaks about PTP accuracy, traffic shaping (SMPTE ST 2110-21) and SMPTE ST 2022-7 redundancy.

Next, Michael Waidson from Tektronix focuses on Precision Time Protocol (PTP) which is a cornerstone of synchronisation of IP media networks. He walks us through Best Master Clock algorithm, boundary and transparent clocks plus PTP fault finding. (You might also want to watch the Monitoring and Measuring IP Media Networks presentation by Michael which we recently published on The Broadcast Knowledge.)

Furthermore, Jack Douglass from PacketStorm talks about ST 2110-21 traffic shaping measurements. He also shows how to use network emulation tools for testing ST 2022-7 link redundancy (the same data is sent through two separate paths of network emulation that are synchronised together, then burst loss are generated using RTP sequence number, with the least important bit different on both paths).

The next speaker is Ståle Kristoffersen from Bridge Technologies. He focuses on live performance monitoring in a ST 2110 network – does the signal make sense? (IP headers, RTP headers, ST 2110-20/30/40 essences), do all of the signals arrive? (packet loss, monitoring packet loss on 2022-7 links), does the signal arrive on time? (late can be just as bad as a packet loss) amongst others.

Moreover, Kevin Salvidge from Leader shows the differences in monitoring in an SDI and an all-IP facility. He compares single essence per BNC with multiple essences per fibre, synchronous and asynchronous transport and causes for errors (cable loss and impedance mismatch vs error packet loss and network overload). He also emphasises the need for accuracy of PTP and explains how to measure it.

Last but not least, Adam Schadle from Video Clarity walk us through video / audio performance and quality methods. He shows how to use picture and sound quality objective tests to understand network behaviour.

The presentations are followed by Q&A session.

See the slides here.

Watch now!

Speakers

	Willem Vermost Senior IP Media Technology Architect EBU
	Michael Waidson Application Engineer Tektronix
	Jack Douglass VP Marketing and Business Development PacketStorm
	Ståle Kristoffersen Lead Software Developer Bridge Technologies
	Kevin Salvidge European Regional Development Manager Leader
	Adam Schadle Vice President Video Clarity

Video: VVC, EVC, LCEVC, WTF? – An update on the next hot codecs from MPEG

Posted on 30th September 2019 by Russell Trafford-Jones

The next-gen codecs are on their way: VVC, EVC, LCEVC but, given we’re still getting AV1 up and running, why do we need them and when will they be ready?

MPEG are working hard on 3 new video codecs, one in conjunction with the ITU, so Christian Feldmann from Bitmovin is here to explain what each does, the target market, whether it will cost money and when the standard will be finalised.

VVC – Versatile Video Codec – is a fully featured video codec being worked on as a successor to H.265, indeed the ITU call it H.266. MPEG call it MPEG-I Part 3. Christian explains the ways this codec is outperforming its peers including a flexible block partitioning system, motion prediction which can overlap neighbouring macroblocks and triangle prediction to name but three.

EVC is the Essential Video Codec which, intriguingly, offers a baseline which is free to use and a main profile which requires licences. The thinking here is that if you have licensing issues, you have the option of just turning off that feature which could five you extra leverage in patent discussions.

Finally, LCEVC – the Low Complexity Essential Video Codec allows for enhancement layers to be added on top of existing bitstreams. This can allow UHD to be used where only HD was possible before due to being able to share decoding between the ASIC and CPU, for example.

These all have different use cases which Christian explains well, plus he brings some test results along showing the percentage improvement over today’s HEVC encoding.

Watch now!
Speaker

Christian Feldmann
Codec Engineer,
Bitmovin

Video: Red and Blue, or Purple; Your IP Media Network, Your Way

Posted on 4th September 2019 by Adam K

Leaf & spine networks have started taking over data centres in the last few years. It’s no secret that people prefer scale-out over scale-up solutions and you can see a similar approach in ST 2110 networks, when large monolithic video switches are replaced with smaller leaf and spine switches.

Leaf and spine refers to networks where a number of main, high throughput switches link to a number of smaller switches. These smaller switches tend to be aggregators and offer the promise of cheaper ports delivered closer to your equipment. The alternative to leaf & spine is monolithic switches which do have their merits, but are certainly not always the right choice.

To provide non-blocking switching in leaf & spine networks you need an SDN controller that orchestrates media flows. Advances in SDN capabilities have led to the emergence of “Purple” network architectures. In this video Gerard Phillips from Arista shows how it differs from a “Red/Blue” architecture, how path diversity is maintained and how ST 2110 IP live production or playout applications could benefit from it.

It’s important to be aware of the different uses of Layer 2 vs Layer 3:

• Layer 3 have distributed IGMP management since PIM is used on each router to route multicast traffic, so there is no more flooding network with unnecessary traffic. This type of network works well with high bit rate video multicasts, but as IGMP is not bandwidth aware, it’s best to use an SDN system for flow orchestration.

Gerard then looks at resilience:

Using 2022-7 seamless switching (plus a robust monitoring system that can provide quick, accurate information to resolve the issue)
Choosing quality components (switches, NOS, fibres etc.)
Providing redundancy (redundant PSU, fans, fabric modules etc., redundant links between switches, ensuring that routing protocol or SDN can use these “spares”)
Dividing up failure domains
Using leaf and spine architecture (routing around failed components with SDN)
Using resilient IP protocols (BGP, ECMP)

The talk finishes up discussing the pros and cons of the different architectures available:

Monolithic systems which are non-blocking, but have a wide failure domain
Monolithic – expansion toward spine and leaf with SDN for non-blocking switching
Leaf & spine with air-gapped Red and Blue networks
Leaf & spine hybrid with Purple switches connected to both Red and Blue spines to support single homed devices
Leaf & spine Purple. Here, red and blue flows are connected to physically separate switches, but the switches are not identified as red and blue anymore. This is a converged network and an SDN controller is required to provide diverse paths flows to go to two different spines.

You can download the slides from here.

Watch now!

Speaker

Gerard Phillips
Systems Engineer
Arista Networks

Webinar: Cloud Ingest

Posted on 28th August 2019 by Russell Trafford-Jones

RIST and SRT are gaining more and more traction as they solve the reliability question over internet contribution. Promising cheaper costs than dedicated circuits, so much of our life uses the internet, it seems logical that it helps connect broadcasts as much as it does video conferences.

SRT and RIST are both protocols which allow streaming of video and other media over networks. If any packets go missing then the receiver will let the sender know and the sender will retransmit the missing data. All being well, these missing packets will arrive in time and no one will know that any data loss took place.

SRT was started by Haivision and is now an open source collaboration with a public repository and slack workspace. It goes beyond simple retransmission and actually offers an encrypted link which is so important when it comes to sports and other high value content.

RIST is being developed by the Video Services Forum (VSF) and the specifcation TR-06 defines how it works. This is is released as a freely-available specification and implementations based on the first release were shown at IBC2018. For a video on RIST, check out this talk from Merrick Ackermans

The RIST working group comprises people from Haivision, Zixi, NetInsight and other companies many of whom also have similar technologies. So the question is why is RIST of so much interest and what are the differences and benefits to SRT?

This Webinar from Net Insight sets out to answer just this question as we’ll as looking to the future to see what is yet to come on the RIST roadmap.

Register now!
Speakers

	Love Thyresson Head of Internet Media Transport, Net Insight
	Alexander Sandström Head of Product Marketing & Co-chair of RIST Forum, Net Insight