Essential Video Coding: Difference between revisions

Revision as of 16:54, 25 October 2021

Revision as of 20:04, 25 October 2021

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== Concept ==

The publicly available requirements document<ref name="req"/> outlines a development process that is defensive against patent threats: Two sets of coding tools, ''base'' and ''enhanced'', are defined:

outlines a development process that is defensive against patent threats:

Two sets of coding tools, ''base'' and ''enhanced'', are defined:

* The base consist of ''tools that were made public more than 20 years ago or for which a Type 1 declaration is received''. Type 1, or option 1, means "royalty-free", in the nomenclature used in ISO documents.<ref name="iso-speak"/>

* The "enhanced" set consists of 21<ref name="Licenses4_21Tools">{{cite web |last1=Samuelsson |first1=Jonatan |author1-link=Divideon |last2=Choi |first2=Kiho |author2-link==Samsung |last3=Chen |first3=Jianle |author3-link==Futurewei |last4=Rusanovskyy |first4=Dmytro |author4-link==Qualcomm |title=MPEG-5 Part 1: Essential Video Coding |url=https://ieeexplore.ieee.org/document/9146794 |website=ieeexplore.ieee.org |publisher=SMPTE |access-date=26 June 2021 |ref=Licenses21Tools21}}</ref> other tools which have passed an extra compression efficiency justification and which can be disabled individually.

Each of the 21 [[payable]] tools can have separately acquired and separately [[negotiation|negotiated]] and separately [[Trade|Traded]] [[License agreement]]s. <ref name="Licenses4_21Tools"/> Each can be individually turned off and, when necessary, replaced by a corresponding [[cost free]] baseline profile tool. This structure makes it easy to fall back to a smaller set of tools in the future, if, for example, [[License agreement|licensing]] complications occur around a specific tool, without breaking [[Computer compatibility#Software|compatibility]] with already deployed decoders. <ref name="Licenses4_21Tools"/>

Every of 21 different coding tools from payable main profile can be individually turned off and, when necessary, replaced by a corresponding [[cost free]] baseline profile tool. This structure makes it easy to fall back to a smaller set of tools in the future, if, for example, [[License agreement|licensing]] complications occur around a specific tool, without breaking [[Computer compatibility#Software|compatibility]] with already deployed decoders. <ref name="Licenses4_21Tools"/>

Bitstream-switchableA codingproposal toolsby are[[Samsung]], also[[Huawei]] knownand from[[Qualcomm]] Divideon'sforms XVCthe basis of EVC.<ref name="3codecs" />

==License==

1 Basic free of [[fee]] profile with effectiveness on similar level to [[MPEG-4]].<ref name="iso-speak"/><br>

21 independent levels of [[License#Mass licensing of software|license]] depending on what of the [[License#Patent licensing|21]] [[patent]]ed tools you want to be activated or not. <ref name="Licenses4_21Tools" />

== Contributors ==

A proposal by [[Samsung]], [[Huawei]] and [[Qualcomm]] was selected as the basis for EVC.<ref name="3codecs"/> Divideon is among the editors of the standard.<ref name="smpte2019"/>

== Implementations ==