Interoperable Master Format: Difference between revisions

Revision as of 16:56, 15 March 2022

Revision as of 18:41, 15 March 2022

Line 37:

In IMF, each kind of [[Essence (media)|essence]] (video, audio, subtitles, etc.) is stored in individual media files (“Track Files”) and the instructions for synchronizing these media files are stored in a separate playlist file (“Composition Playlist”). This component-based approach allows the large media files to be reused across multiple playlists, each representing a different version of the content.

The IMF family of standards is maintained by [[Society of Motion Picture and Television Engineers|SMPTE]].<ref name=":0">{{Cite journal |date=August 2021-08 |title=OV 2067-0-2021 - SMPTE Overview Document - Interoperable Master Format |url=https://ieeexplore.ieee.org/document/9521128/ |journal=OV 2067-0-2021 |pages=1–4 |doi=10.5594/SMPTE.OV2067-0-2021}}</ref>. Its first edition was published in 2013.

= Architecture =

Line 60:

The core constraints represent the bulk of the IMF standard, with applications and plugins introducing minimal variations. So far, the primary distinction between applications has been in the choice of video codecs.

The core constraints are specified in SMPTE ST 2067-2 (Core Constraints)<ref name=":1">{{Cite journal |date=May 2020-05 |title=ST 2067-2:2020 - SMPTE Standard - Interoperable Master Format — Core Constraints |url=https://ieeexplore.ieee.org/document/9097478/ |journal=ST 2067-2:2020 |pages=1–43 |doi=10.5594/SMPTE.ST2067-2.2020}}</ref>. An example of an applications is Application #2E, which is specified in SMPTE ST 2067-21<ref name=":2">{{Cite journal |date=May 2020-05 |title=ST 2067-21:2020 - SMPTE Standard - Interoperable Master Format — Application #2E |url=https://ieeexplore.ieee.org/document/9097487/ |journal=ST 2067-21:2020 |pages=1–34 |doi=10.5594/SMPTE.ST2067-21.2020}}</ref> and targets studio masters. One of the plugins is the Immersive Audio Bitstream Level 0 Plug-in, which is specified in SMPTE ST 2067-201<ref>{{Cite journal |date=January 2021-01 |title=ST 2067-201:2021 - SMPTE Standard - Immersive Audio Bitstream Level 0 Plug-in |url=https://ieeexplore.ieee.org/document/9343937/ |journal=ST 2067-201:2021 |pages=1–14 |doi=10.5594/SMPTE.ST2067-201.2021}}</ref> and adds support for immersive sound.

= Example uses =

Line 70:

* Image up to 8192x6224 rasters, lossy and lossless compression, high-dynamic range, wide color gamut and stereoscopic 3D,<ref name=":2" />

* 24-bit 48 kHz channel-based sound, arranged in arbitrary configurations

* Immersive Audio Bitstream (IAB) immersive sound<ref>{{Cite journal |date=June 2019-06 |title=ST 2098-2:2019 - SMPTE Standard - Immersive Audio Bitstream Specification |url=https://ieeexplore.ieee.org/document/8752533/ |journal=ST 2098-2:2019 |pages=1–54 |doi=10.5594/SMPTE.ST2098-2.2019}}</ref>

* Subtitles and captions that conform to the TTML Profiles for Internet Media Subtitles and Captions 1.1 (IMSC 1.1) W3C Recommendation<ref>{{Cite web |title=TTML Profiles for Internet Media Subtitles and Captions 1.1 |url=https://www.w3.org/TR/ttml-imsc1.1/Overview.html |access-date=2022-03-04 |website=www.w3.org}}</ref><ref>{{Cite journal |date=May 2020-05 |title=ST 2094-40:2020 - SMPTE Standard - Dynamic Metadata for Color Volume Transform — Application #4 |url=https://ieeexplore.ieee.org/document/9095450/ |journal=ST 2094-40:2020 |pages=1–29 |doi=10.5594/SMPTE.ST2094-40.2020}}</ref>

== History ==