Video: Keeping Time with PTP

The audio world has been using PTP for years, but now there is renewed interest thanks to its inclusion in SMPTE ST 2110. Replacing the black and burst timing signal (and for those that used it, TLS), PTP changes the way we distribute time. B&B was a waterfall distribution, PTP is a bi-directional conversation which, as a system, needs to be monitored and should be actively maintained.

Michael Waidson from Telestream (who now own Tektronix) brings us the foundational basics of PTP as well as tips and tricks to troubleshoot your PTP system. He starts by explaining. the types of messages which are exchanged between the clock and the device as well as why all these different messages are necessary. We see that we can set the frequency at which the announce, sync and follow-up messages. The sync and follow-up messages actually contain the time. When a device receives one of these messages, it needs to respond with a ‘delay request’ in order to work out how much of a delay there is between it and the grand master clock. This will result in it receiving a delay response. On top of these basic messages, there is a periodic management message which can contain further information such as daylight savings time or drop-frame information.

Michael moves on to looking at troubleshooting highlighting the four main numbers to check: The domain value, grandmaster ID, message rates and the communication mode. PTP is a global standard used in many industries. To make PTP most useful to the broadcast industry, SMPTE ST 2059 defines values to use for message repetition (4 per second for announce messages, 8 for sync, delay request and delay response). ST 2059 also defines how devices can determine the phase of any broadcast signal for any given time which is the fundamental link needed to ensure all devices keep synchronicity.

Another good tip from Michael is if you see the grandmaster MAC changing between the grandmasters on the system, this indicates it’s no receiving any announce messages so is initiating the Best Master Clock Algorithm (BMCA) and trying the next grandmaster. Some PTP monitoring equipment including from Meinberg and from Telestream can show the phase lag of the PTP timing as well as the delay between the primary and secondary grandmaster – the lower the better.

A talk on PTP can’t avoid mentioning boundary clocks and transparent switches. Boundary clocks take on much of the two-way traffic in PTP protecting the grandmasters from having to speak directly to all the, potentially, thousands of devices. Transparent switches, simply update the time announcements with the delay for the message to move through the switch. Whilst this is useful in keeping the timing accurate, it provides no protection for the grandmasters. He finishes video ends with a look at how to check ptp messages on the switch.

Watch now!
Speakers

Michael Waidson Michael Waidson
Application Engineer
Telestream (formerly Tektronix)

Video: Real-Time Remote Production For The FIFA Women’s World Cup

We hear about so many new and improved cloud products and solutions to improve production that, once in a while, you really just need to step back and hear how people have put them together. This session is just that, a look at the whole post production workflow for FOX Sports’ production of the Women’s World Cup.

This panel from the Live Streaming Summit at Streaming Media West is led by FOX Sports’ Director of Post Production, Brandon Potter as he talks through the event with three of his key vendors, IBM Aspera, Telestream and Levels Beyond.

Brandon starts by explaining that this production stood on the back of the work they did with the Men’s World Cup in Russia, both having SDI delivery of media in PAL at the IBC. For this event, all the edit crew was in LA which created problems with some fixed frame-rate products still in use in the US facility.

Data transfer, naturally is the underpinning of any event like this with a total of a petabyte of data being created. Network connectivity for international events is always tricky. With so many miles of cable whether on land or under the sea, there is a very high chance of the fibre being cut. At the very least, the data can be switched to take a different path an in that moment, there will be data loss. All of this means that you can’t assume the type of data loss, it could be seconds, minutes or hours. On top of creating, and affording, redundant data circuits, the time needed for transfer of all the data needs to be considered and managed.

Ensuring complete transfer of files in a timely fashion drove the production to auto archive of all content in real time into Amazon S3 in order to avoid long post-match ingest times of multiple hours, “every bit of high-res content was uploaded.” stated Michael Flathers, CTO of IBM Aspera.

Dave Norman, from Telestream explains how the live workflows stayed on-prem with the high-performance media and encoders and then, “as the match ended, we would then transition…into AWS”. In the cloud, the HLS proxies would then being rendered into a single mp4 proxy editing files.

David Gonzales explains the benefits of the full API integrations they chose to build their multi-vendor solution around, rather than simple watch-folders. For all platforms to know where the errors were was very valuable and was particularly useful for the remote users to know in detail where their files were. This reduces the number of times they would need to ask someone for help and meant that when they did need to ask, they had a good amount of detail to specify what the problem was.

The talk comes to a close with a broad analysis of the different ways that files were moved and cached in order to optimise the workflow. There were a mix of TCP-style workflows and Aspera’s UDP-based transfer technology. Worth noting, also, that HLS manifests needed to be carefully created to only reference chunks that had been transferred, rather than simply any that had been created. Use of live creation of clips from growing files was also an important tool, the in- and out-points being created by viewing a low-latency proxy stream then the final file being clipped from the growing file in France and delivered within minutes to LA.

Overall, this case study gives a good feel for the problems and good practices which go hand in hand with multi-day events with international connectivity and shows that large-scale productions can successfully, and quickly, provide full access to all media to their production teams to maximise the material available for creative uses.

Watch now!
Speakers

Mike Flathers Mike Flathers
CTO,
IBM Aspera
Brandon Potter Brandon Potter
Director of Post Production,
FOX Sports
Dave Norman Dave Norman
Principal Sales Engineer,
Telestream
Daniel Gonzales Daniel Gonzales
Senior Solutions Architect,
Levels Beyond

Webinar: Enabling intelligent media and entertainment

This webinar brings together Support Partners and Microsoft to explain the term ‘intelligent cloud’ and how this can help creative teams produce higher quality, more innovative content by augmenting human ingenuity, manage content better and grow audiences while increasing advertising and subscription revenue.

The panel will cover:
– Haivision’s SRT Hub, intelligent media routing and cloud-based workflows
– Highlights from partners such as Avid, Telestream and Wowza.
– New production workflows for remote live production, sports and breaking news.
– Connected production: A process that helps with production collaboration and management, removing traditional information and creative silos which exist today, while driving savings and efficiencies from script to screen.

Register now!
Speakers

Jennifer Cooper Jennifer Cooper
Global Head, Media Industry Strategy,
Microsoft
Trent Collie Trent Collie
Senior Partner Development Manager,
Microsoft
Harry Grinling Harry Grinling
Chief Executive Office,
Support Partners
Lutful Khandker Lutful Khandker
Principal SDE Lead,
Microsoft

Webinar: How to Build and Instantaneous, Self-Healing, Live Streaming Service that Delights, Differentiates and Drives Revenue


Date: Tuesday, Oct. 30, 2018 | 8:30AM PDT | 11:30AM EDT | 15:30 GMT

Tune in to hear insights into what content holders and service providers must do to gain viewers, increase engagement, and reduce churn…and how to do it in an automated and efficient manner.

Brian Mahoney will talk to Telestream’s Ken Haren and Stuart Newton about
• How enhanced live production leads to more viewers and subscribers
• The importance of live monitoring of viewer experience
• And the development of “self-x” video delivery architecture that allows for automated functions such as self-diagnosis, re-routing streams and more.

Register now!

Speakers

Brian Mahony Brian Mahony
CEO, Trender Research; President, OTT Executive Summit & Magazine; Co-Founder, Social Tools Summit & Magazine
Ken Haren Ken Haren
Director of Marketing, Telestream
Stuart Newton Stuart Newton
VP Strategy a& Business Development, Telestream