Interoperable Master Format: Difference between revisions

Revision as of 18:45, 23 May 2022

Revision as of 16:26, 26 May 2022

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The Composition Playlist is an [[XML]] document<ref>{{Cite journal |date=May 2020 |title=ST 2067-3:2020 - SMPTE Standard - Interoperable Master Format — Composition Playlist |url=https://ieeexplore.ieee.org/document/9097510/ |journal=ST 2067-3:2020 |pages=1–35 |doi=10.5594/SMPTE.ST2067-3.2020}}</ref>. It assembles the Track Files<ref>{{Cite journal |date=May 2020 |title=ST 2067-5:2020 - SMPTE Standard - Interoperable Master Format — Essence Component |url=https://ieeexplore.ieee.org/document/9099734/ |journal=ST 2067-5:2020 |pages=1–15 |doi=10.5594/SMPTE.ST2067-5.2020}}</ref> onto virtual tracks that are synchronized onto a timeline. It also contains metadata associated with that timeline.The combination of a Composition Playlist and the Track Files it references is called a Composition.

TheEach primaryComposition benefitrepresents a different version of separatingan audio-visual work. Separating the Composition Playlist from the Track Files isallows thatreuse aof Track File can be reusedFiles across multiple Compositions, as shown in the secondreuse imageexample. Each Composition represents a different version of an audio-visual work. Since different versionsVersions of a titleprogram typicallycan differ in small ways. and thisThis component-based approach results in smallermore files,efficient feweruse qualityof controlmedia, passesfewer andduplicated fewermaster resources expended on mastering the multiple versions. For example, aand censoredsimplified version of a movie might differworkflows in onlymastering, aquality fewcontrol, video frames from the original. Instead of having to deliver or store two largely identical versionsinventory, IMFand allows the censored version to reuse the Track Files of the original versiondistribution.

[[File:IMF Track File Re-use Example.svg|alt=IMF can re-use Track Files to minimize resource usage for versions of audio-viual works.|thumb|IMF Track File Reuse]]

For example, a censored version of a film might remove a scene considered offensive in a particular territory. Using a new Composition Playlist which ignores the scene, the remainder of the media may be used without issuing a new master element.[[File:IMF Track File Re-use Example.svg|alt=IMF can re-use Track Files to minimize resource usage for versions of audio-viual works.|thumb|IMF Track File Reuse]]

= Specifications =

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= Example uses =

IMF is specified by professional content creators for delivery of their content, including: BBC<ref>{{Cite web |title=TechnicalDeliveryStandardsBBCUHDiPlayerSupplement.pdf |url=https://www.dropbox.com/s/tkvwxksgy3izpca/TechnicalDeliveryStandardsBBCUHDiPlayerSupplement.pdf?dl=0 |access-date=2022-03-04 |website=Dropbox |language=en}}</ref>, Netflix<ref>{{Cite web |title=Netflix Branded Delivery Specifications v4.1 |url=https://partnerhelp.netflixstudios.com/hc/en-us/articles/214806618-Netflix-Branded-Delivery-Specifications-v4-1 |access-date=2022-03-04 |website=Netflix {{!}} Partner Help Center |language=en-US}}</ref> and Disney<ref>{{Cite web |date=2021-04-27 |title=Disney Media Tech Specs |url=https://mediatechspecs.disney.com/#/mastering/video/imf-master-packageshttps://mediatechspecs.disney.com/production/naming-convention/naming-convention#/mastering/video/imf-master-packages |access-date=2022-03-04 |website=mediatechspecs.disney.com}}</ref>

= Supported essence =