What are SMPTE ST 2086 mastering-display metadata and CTA-861.3 MaxCLL/MaxFALL, and what can be verified from free public texts?
SMPTE ST 2086 exists as 2014 and 2018 (stabilized) publications in the SMPTE library, and its text was not read; the free AV1 specification carries the same mastering-display data model (three primaries and white point as 0.16 fixed-point CIE 1931 coordinates, max luminance 24.8 and min luminance 18.14 fixed-point in cd/m2) and defers MaxCLL/MaxFALL definitions to CEA-861.3 Appendix A; FFmpeg stores these as rationals and unsigned cd/m2 values without defining how to measure them.
SMPTE ST 2086 exists as 2014 and 2018 (stabilized) publications in the SMPTE library, and its text was not read; the free AV1 specification carries the same mastering-display data model (three primaries and white point as 0.16 fixed-point CIE 1931 coordinates, max luminance 24.8 and min luminance 18.14 fixed-point in cd/m2) and defers MaxCLL/MaxFALL definitions to CEA-861.3 Appendix A; FFmpeg stores these as rationals and unsigned cd/m2 values without defining how to measure them.
Curator qualifications: CTA-861.3-A purchase page and price (S38) not reinspected; standard texts not read (paywalled/library). Measurement method for MaxCLL/MaxFALL unestablished from free texts. Text and header reading only.
Limitations: Free secondary trail only.
Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.
Structured fields
{
"citations": [
{
"url": "https://pub.smpte.org/doc/st2086/",
"note": "pub.smpte.org/doc/st2086/; aomediacodec.github.io/av1-spec (fetched 2026-10-22), metadata HDR semantics; libavutil/mastering_display_metadata.h at 4bef4614"
},
{
"url": "https://shop.cta.tech/products/hdr-static-metadata-extensions",
"note": "pub.smpte.org/doc/st2086/; aomediacodec.github.io/av1-spec (fetched 2026-10-22), metadata HDR semantics; libavutil/mastering_display_metadata.h at 4bef4614"
},
{
"url": "https://aomediacodec.github.io/av1-spec/",
"note": "pub.smpte.org/doc/st2086/; aomediacodec.github.io/av1-spec (fetched 2026-10-22), metadata HDR semantics; libavutil/mastering_display_metadata.h at 4bef4614"
},
{
"url": "https://github.com/FFmpeg/FFmpeg/blob/4bef4614fe8e7429600cc445f0e5aad5ec89ba6e/libavutil/mastering_display_metadata.h",
"note": "pub.smpte.org/doc/st2086/; aomediacodec.github.io/av1-spec (fetched 2026-10-22), metadata HDR semantics; libavutil/mastering_display_metadata.h at 4bef4614"
}
]
}Evidence claims
- [sourced_fact] SMPTE ST 2086 exists as 2014 and 2018 (stabilized) publications in the SMPTE library, and its text was not read; the free AV1 specification carries the same mastering-display data model (three primaries and white point as 0.16 fixed-point CIE 1931 coordinates, max luminance 24.8 and min luminance 18.14 fixed-point in cd/m2) and defers MaxCLL/MaxFALL definitions to CEA-861.3 Appendix A; FFmpeg stores these as rationals and unsigned cd/m2 values without defining how to measure them. · locator: pub.smpte.org/doc/st2086/; aomediacodec.github.io/av1-spec (fetched 2026-10-22), metadata HDR semantics; libavutil/mastering_display_metadata.h at 4bef4614 source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |