Video: A Study of Protocols for Low Latency Video Transport Over the Internet

Posted on by Russell Trafford-Jones

Contribution via the internet is tricky but has great promise. With packet loss and jitter all over the place, how can you deliver perfect video?

Ciro Noronha from Cobalt Digital explains the two ways people get around the unreliability of the internet: FEC and retransmission. Forward Error Correction uses some maths to transmit extra data on top of the stream which allows the receiver to correct for any packet losses. This method is standard in satellite transmission where it is always used to add robustness.

Retransmission is different in that it requires a return channel. When a receiver spots a missing packet, it asks for it to be resent. Being that it has to wait for a reply, retransmission protocols like SRT, ARQ and RIST run with a configurable buffer which needs to be big enough for at least one round trip. FEC schemes also require a buffer as it needs to wait for a number of packets before it can complete the maths required.

Ciro introduces FEC and ARQ before presenting work showing experiments he’s run on both FEC and ARQ to see the limits of their signal-correcting capabilities and latency. He finishes explaining what RIST is and its status.

Bring yourself up to date with RIST!
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Speaker

Ciro Noronha Ciro Noronha
Director of Technology,
Cobalt Digital

Video: Reducing Stream Latency

Posted on by Russell Trafford-Jones


Latency seems to be the new battleground for streaming services. While optimising bandwidth and quality are still highly important, they are becoming mature parts of the business of streaming whereas latency, and technologies to minimise it – as Apple showed this month – are still developing and vying for position.

Here, the Streaming Video Alliance brings together people from large streaming services to explore this topic finding out what they’ve been doing to reduce it, the problems they’ve faced and the solutions which are on the table.

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Speakers

Kevin Johns Kevin Johns
Distinguished Network Architect, Content and Media
CenturyLink
Chris Sammoury Chris Sammoury
Principal Engineer II,
Charter Communications
Richard Oesterreicher Richard Oesterreicher
CEO
Streaming Global/Hellastorm
Patrick Gendron Patrick Gendron
Director, Innovation
Harmonic
Johan Bolin Johan Bolin
Chief Product and Technology Officer,
Edgeware
Steve Miller-Jones Steve Miller-Jones
Vice President of Product Strategy,
Limelight Networks
Jason Thibeault Jason Thibeault
Executive Director,
Streaming Video Alliance

Video: Analysis of emerging video codecs: coding tools, compression efficiency and complexity

Posted on by Russell Trafford-Jones


Delivering great quality, live video without breaking the bank is difficult. This talk looks at the different ways companies are dealing with this challenge.

NGCodec’s founder, Oliver Gunasekara, starts by quantifying the millions of dollars spent just by one company each year just on delivering their video and introduces the difficulties of CPU encoding compared to dedicated chips – ASICS and looks at how FPGAs fit in. Cloud-based FPGAs are available on AWS, Baidu, Alibaba and others.

After covering Twitch’s move to VP9 on FPGA, the talk finishes looking at on-premise implementation, Oliver looks at the cost of ownership of servers compared to Xilinx FPGA.

Speakers

Oliver Gunasekara Oliver Gunasekara
Founder. & CEO,
NGCodec

Video: How Video is Affected by Human Physiology

Posted on by Russell Trafford-Jones

How can we make video more appealing to humans? We’ve evolved to live a certain way and this has defined – and will continue to define – our video technologies. MUX founder Jon Dahl talks to us here about the ways in which human physiology drives viewing habits.

Vertical vs. horizontal video, angular resolution and how the typical viewing distances of computers, TVs and other devices affects what resolution we can perceive are all discussed. Jon moves on to frequencies both of audio and video where frame rates and flicker are important and where physics comes into play alongside biology.

Even for the experienced, this talk is bound to bring something new and is a great tour of the fundamentals of the visual perception that our industry relies on and strives to please day in, day out.

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Free registration required

This talk was given at Streaming Tech Sweden which is an annual conference from Eyvinn Technology. Streamed on their own video platform, talks are initially available exclusively to all conference attendees, but are released free-to-view during the subsequent year. Free registration is required to watch the videos.

Speaker

John Dahl John Dahl
Founder,
MUX