ISO IEC 23001-10:2020 pdf download – Information technology – MPEG systems technologies

03-06-2022 comment

ISO IEC 23001-10:2020 pdf download – Information technology – MPEG systems technologies
1 Scope
This document defines a storage format for timed metadata. The timed metadata can be associated with other tracks in the ISO base media file format. Timed metadata such as quality and power consumption information and their metrics are defined in this part for carriage in files based on the ISO base media file format (ISO/IEC 14496-12). The timed metadata can be used for multiple purposes including supporting dynamic adaptive streaming.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 14496-10, Information technology — Coding of audio-visual objects — Part 10: Advanced video coding
ISO/IEC 14496-12, Information technology — Coding of audio-visual objects — Part 12: ISO base media file format
ISO/IEC 23001-11, Information technology — MPEG Systems Technologies — Part 11: Energy-Efficient Media Consumption (Green Metadata)
ISO/IEC 23008-2, Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 2: High efficiency video coding
ITU-T Recommendation J.144, Objective perceptual video quality measurement techniques for digital cable television in the presence of a full reference
ITU-T Recommendation J.247, Objective perceptual multimedia video quality measurement in the presence of a full reference
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 14496-10 and ISO/IEC 23008 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4.1 General
If quality metrics are carried in an ISO base media file format, they shall be carried in the metadata tracks within the ISO base media file format in accordance with ISO/IEC 14496-12. Different metric types and corresponding storage formats are identified by their unique code names. This clause defines those quality metrics. The metadata track is linked to the track it describes by means of a ‘ cdsc’ (content describes) track reference. Codes not defined in this document are reserved and files shall use only codes defined here.
The quality metrics sample entry shall contain a QualityMetricsConfigurationBox , describing metrics that are present in each sample, and the constant field size that is used for the values. The quality metrics are defined in subclause 4.3. Each sample is an array of quality values, corresponding one for one to the declared metrics. Each value is padded by preceding zero bytes, as needed, to the number of bytes indicated by field_size_bytes.
NOTE 1 This is the traditional metric referred to as PSNR in academic literature and in the context of video compression research.
NOTE 2 In cases when the spatial resolution of the reference pictures and the reconstructed ones do not match, reconstructed pictures are up-sampled to match the spatial resolution of the reference.
NOTE 3 In cases when the pictures of reconstructed video represent only a subset of pictures in the reference video sequence, reconstructed pictures are replicated to produce time-aligned reconstructed pictures for all pictures in the reference sequence.

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