Supplemental HDR Signaling

[technogeek00]

Use Case Description

Content providers want to signal in the manifest additional HDR metadata available within tracks

Working Notes

• Dynamic HDR metadata typically addressing Dolby Vision and HDR10+ cases
• HLS signaling details
  • VIDEO-RANGE attribute with values PQ and HLG provide base signaling of HDR
  • SUPPLEMENTAL-CODECS property provides enhancement layer specific codec strings
  • Example data available in documentation guide (repeated below in case of change)

Codec	CODECS attribute	SUPPLEMENTAL-CODECS attribute	VIDEO-RANGE attribute
Dolby Vision 8.4	hvc1.2.4.L153.b0	dvh1.08.07/db4h	HLG
Dolby Vision 8.1	hvc1.2.4.L150	dvh1.08.06/db1p	PQ
Dolby Vision 10.4	av01.0.13M.10.0.112	dav1.10.09/db4h	HLG
HDR10+	hvc1.2.20000000.L123.B0	hvc1.2.20000000.L123.B0/cdm4	PQ
AV1 w/ HDR10+	av01.0.05M.10.0.112	av01.0.05M.10.0.112/cdm4	PQ

• DASH signaling details
  • Usages of SupplementalProperty within a referenced AdaptationSet or Representation
  • @schemeIdUri="http://dashif.org/metadata/hdr"
  • @value one of SMPTE2094-10, SMPTE2094-40, TS103433

Open Questions

• Is there codec signaling in the DASH variation?

Scoring

To be filled out still

Question	Answer
Does the feature relate to an industry streaming use-case?	Yes
- What is the commonality of this case?	Common
- Is this an established or emerging practice?	Emerging
Does this feature have related mechanisms in both DASH and HLS?	Yes
- What is the maturity of support in both specifications?	HLS - Mature, DASH - Immature
- What is the maturity of implementation support for both specifications?	HLS - Immature/Mature, DASH - Immature
- Are there known interoperability issues between specs?	Potentially, but DASH signaling being updated to include supplemental codecs
- Has anyone implemented this interoperably?	No
- Are there features missing in a specification with open proposals for it?	HSL - No, DASH - Yes
Has the industry defined defacto mechanisms not present in both DASH and/or HLS?	N/A
- Why was functionality defined outside of the main specifications?	N/A
- Has the functionality been standardized elsewhere (DASH-IF, CTA, SVA)?	No
- Is the functionality proprietary or openly developed?	N/A
- Could the functionality be incorporated into specifications with evangelism?	N/A

[technogeek00]

2024/08/14

• Existing SCTE 214-1 Constraints document providing supplemental codec binding based on missing need
• Additionally MPEG-DASH 6th Edition introducing formal supplemental codec signaling, may conflict with SCTE
• DASH-IF signaling likely obsoleted by the 6th edition work, will not use