QuickTime File Format with YUY2 (yuv2) Video Encoding

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QuickTime File Format with YUY2 (yuv2) Video Encoding

Table of Contents

Identification and description
Local use
Sustainability factors
Quality and functionality factors
File type signifiers
Notes
Format specifications
Useful references

Format Description Properties

ID: fdd000369
Short name: QT_YUY2
Content categories: moving-image
Format Category: file-format, encoding
Other facets: unitary, binary, sampled
Last significant FDD update: 2013-02-01
Draft status: Partial

Identification and description

Relationship to other formats
Full name	QuickTime File Format with YUY2 (yuv2) Video Encoding
Description	QuickTime file format wrapping YUY2 (the Apple identifier is yuv2) uncompressed video essence, typically multiplexed with soundtrack audio.
Production phase	Generally employed in post-production or editing (middle phase) and in limited modes of dissemination (final phase).
Subtype of	QuickTime, QuickTime File Format
Contains	YUY2, YUY2 Video Picture Encoding
May contain	Audio essences of various types, not discussed at this time.

Local use

LC experience or existing holdings	No extensive experience.
LC preference	None. For preservation reformatting, the Library of Congress' Packard Campus for Audio-Visual Conservation has chosen MXF_OP1a_JP2_LL (lossless JPEG 2000 wrapped in MXF operational pattern 1a).

Sustainability factors

Disclosure	See QuickTime and YUY2.
Documentation	See QuickTime and YUY2.
Adoption	Widely adopted.
Licensing and patents	None.
Transparency	Relatively transparent; requires tools to write and read.
Self-documentation	See QuickTime.
External dependencies	None.
Technical protection considerations	None.

Quality and functionality factors

Moving Image
Normal rendering	Supported
Clarity (high image resolution)	See YUY2.
Functionality beyond normal rendering	See QuickTime.

File type signifiers and format identifiers

Tag	Value	Note
Filename extension	See related format.	See QuickTime.
Internet Media Type	See related format.	See QuickTime.
Magic numbers	See note.	See QuickTime.
Other	yuv2	Apple Video Codec four-character code, referenced in a QuickTime file as the feature-values element in the QuickTime Video Codec Type. Comments welcome.
Pronom PUID	See note.	See https://www.nationalarchives.gov.uk/PRONOM/x-fmt/384 for QuickTime File Format.
Wikidata Title ID	See note.	See https://www.wikidata.org/wiki/Q942350 for QuickTime File Format.

Notes

General	Appendix F of the QuickTime File Format Specification describes the QuickTime Video Codec Type. This type contains the elements profile atom [Track (video), movie]; part-ID [0x20202020 (universal feature)]; feature-code ['vfmt']; feature-value [Unsigned int(32) (a four-character-code) holding the QuickTime video codec type copied from the ImageDescription structure’s cType field."]. The "feature-values" is the four-character-code found in a video sample description. In this instance: yuv2. Comments welcome.
History

General

Appendix F of the QuickTime File Format Specification describes the QuickTime Video Codec Type. This type contains the elements profile atom [Track (video), movie]; part-ID [0x20202020 (universal feature)]; feature-code ['vfmt']; feature-value [Unsigned int(32) (a four-character-code) holding the QuickTime video codec type copied from the ImageDescription structure’s cType field."]. The "feature-values" is the four-character-code found in a video sample description. In this instance: yuv2. Comments welcome.

History

Format specifications

See Disclosure under Sustainability factors.

Useful references

URLs

Appendix F of the QuickTime File Format Specification. (https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFAppenF/QTFFAppenF.html#//apple_ref/doc/uid/TP40000939-CH226-SW1). Includes description of QuickTime Video Codec Type cited in Notes above. Note that this document has been revised several times since initial release in 2007.

Last Updated: 08/04/2021

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Sustainability of Digital Formats: Planning for Library of Congress Collections