High Dynamic Range in AV1

Matt Frost Chrome Media

Alan Chalmers University of Warwick & trueDR

IBC 2018

Why Codecs?

IBC 2018

+25% +20% +15% +10% +5% +2%

YouTube VP9 watch time gains vs. H.264

Founded in Fall 2015, 36 companies came together to develop next generationIBC codecs2018 for the web.

IABM Copyright 2018 www.theiabm.org @THEIABM Goals for Video Codec Open Deploy Widely & for the Web source & Quickly With state of royalty- Developed faster the art free than standards compression Grounded bodies and efficiency in the supported across WebM platforms philosophy

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Member companies with video-on-demand streaming consumer products & services.IBC 2018

Member companies with live streaming and/or real time communication consumerIBC products2018 & services.

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Tools Codebase Spec Support in SoC Selected frozen Published Chrome Hardware (Complete (Complete (Complete (Q3 2018) (2020) d) d) d)

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• Download Chrome Canary / Dev Channel ●"Enable AV1 Video Decoding" to "Enabled" in chrome://flags IBC 2018 ●Playback

BOOTH SU10725MR BOOTH SU3710 BOOTH SU9901

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● Bitstream specification: https://aomedia.org/av1- bitstream-and-decoding- IBC 2018 process-specification/

IABM Copyright 2018 www.theiabm.org @THEIABM IABM Copyright 2018 www.theiabm.org @THEIABM The real world Very wide range of lighting × Peak luminance is NOT 1,000 or even 10,000nits  Need to be “scene-referred”

A single candle lit in dark a room has a dynamic range 16.8 million to 1 (24 stops)

IABM Copyright 2018 www.theiabm.org @THEIABM IABM Copyright 2018 www.theiabm.org @THEIABM What we did  Added existing HLG and PQ (HDR10)  New HDR methods – scene referred  PTF (Gamma) – real-time, on-the-fly adaptive to: . ambient light, creative intent, display luminance  Ratnajit – faithfully preserves colour

4,000nits 10,000nits

IABM Copyright 2018 www.theiabm.org @THEIABM trueDR HDR IN AV1 AN ALTERNATIVE FUTURE FOR HDR!  Open, royalty-free HDR video coding  No more watching HDR in the dark  High quality, efficient codecs  Wide scope of devices and platforms