Liaison statement
LS on the second edition of Series H Supplement 19 “Usage of video signal type code points” [to ARIB et al.]

ITU-T SG16 would like to inform you that we have approved the 2nd edition of
ITU-T H-series Supplement 19 on “Usage of video signal type code points” at our
current meeting. This supplement was developed in collaboration with ISO/IEC
JTC 1/SC 29/WG 11 (MPEG) and is anticipated to also be published as the second
edition of ISO/IEC TR 23091-4.

This document is written to provide information to help the producers of
various content processing tools to avoid processing mistakes that can cause
video quality degradation due to having incorrect assumptions made about video
property combinations.

The document tabulates and discusses video signal property description code
points and their combinations that are widely used in production and video
content workflows. Code points and their combinations are described along with
the way these are handled in bitstreams encoded using AVC (Rec. ITU-T H.264 |
ISO/IEC 14496-10) and HEVC (Rec. ITU-T H.265 | ISO/IEC 23008-2). The
relationship of the code points to the coding-independent code points (CICP)
standard (Rec. ITU-T H.273 | ISO/IEC 23091-2) is discussed. The corresponding
indicators in IMF (SMPTE ST 2067 series) and MXF (SMPTE ST 377-1) file exchange
formats are also described. Common examples of uses of Mastering Display Colour
Volume (e.g., per SMPTE ST 2086) are included.

In this new edition, the document adds tables to describe the carriage of these
combinations in baseband transmissions. A new combination describing usage of
ICTCP was added to the HDR-WCG table. Additionally, 4000 cd/m2 mastering
display information was added to the MDCV table and the table was split into
two tables for HDR mastering displays and SDR mastering displays. Two new
informative annexes were added. The first annex describes commonly used video
property combinations that are not specified in industry standards. The second
annex indicates the relevance of the system identifier tags in consumer
distribution specifications. Additional general refinements were also included
to improve readability and clarity and improve the use of terminology.

The pre-published version of the approved text of the 2nd edition is attached.

We would welcome your comments on this new publication and input toward
potential development of subsequent editions.