DASH-IF

Video: Specification of Live Media Ingest

Posted on by Russell Trafford-Jones

“Standardisation is more than just a player format”. There’s so much to a streaming service than the video, a whole ecosystem needs to work together. In this talk from Comcast’s Mile High Video 2019, we see how different parts of the ecosystem are being standardised for live ingest.

RTMP and Smooth streaming are being phased out – without proper support for HEVC, VVC, HDR etc. they are losing relevance as well as, in the case of RTMP, support from the format itself. Indeed it’s clear that fragmented MP4 (fMP4) and CMAF are taking hold in their place so it makes sense for a new ingest standard to coalesce around these formats.

Rufael Mekuria from Unified streaming explains this effort to create a spec around live media ingest that is happening as part of MPEG DASH-IF. The work itself started at the end of 2017 with the aim of publishing summer 2019 supporting CMAF and DASH/HLS interfaces.

Rufael explains CMAF ingest used HTTP post to move each media stream to the origin packager. The tracks are separated into video, audio, timed text, subtitle and timed metadata. They are all transferred on separate tracks and is compatible with future codecs. He also covers security and timed text before covering DASH/HLS ingest which can also contain CMAF because HLS contains the capability to contain CMAF.

Reference software is available along with the <a href=”http://”https://dashif-documents.azurewebsites.net/Ingest/master/DASH-IF-Ingest.pdf” rel=”noopener noreferrer” target=”_blank”>specification.

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Speaker

Rufael Mekuria Rufael Mekuria
Head of Research & Standardisation,
Unified Streaming

Video: DASH Updates

Posted on by Russell Trafford-Jones

MPEG DASH is a standardised method for encapsulating media for streaming similar to Apple’s HLS. Based on TCP, MPEG DASH is a widely compatible way of streaming video and other media over the internet.

MPEG DASH is now on its 3rd edition, its first standard being in 2011. So this talk starts by explaining what’s new as of July 2019 in this edition. Furthermore, there are amendments already worked on which are soon to add more features.

Iraj Sodagar explains Service Descriptors which will be coming that allow the server to encapsulate metadata for the player which describes how the publisher intended to show the media. Maximum and minimum latency and quality is specified. for instance. The talk explains how these are used and why they are useful.

Another powerful metadata feature is the Initialization Set, Group and Presentation which gives the decoder a ‘heads up’ on what the next media will need in terms of playback. This allows the player to politely decline to play the media if it can’t display it. For instance, if a decoder doesn’t supply AV1, this can be identified before needing to attempt a decode or download a chunk.

Iraj then explains what will be in the 4th edition including the above, signalling leap seconds and much more. This should be published over the next few months.

Amendement 1 is working towards a more accurate timing model of events and defining a specific DASH profile for CMAF (the low-latency streaming technology based on DASH) which Iraj explains in detail.

Finishing off with session based DASH operations, a look over the DASH workplan/roadmap, ad insertion, event and timed metadata processing, this is a great, detailed look at the DASH of today and of 2020.

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Speaker

Iraj Sodagar Iraj Sodagar
Independant Consultant

Webinar: DASH—New Advancements in DASH Media Delivery

Posted on by Russell Trafford-Jones


Webinar: WEDNESDAY, OCTOBER 18, 2017 – 11:00AM PT / 2:00PM ET / 19:00 BST
In this webinar, we will present the latest MPEG and DASH-IF advancements on DASH. We will cover new additional standard tools for OTT, DASH support for VR/360° video delivery, low-latency DASH streaming, DRM, and the DASH-IF guidelines for streaming UHD/HDR content.
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