Incorrect clipping for high dynamic range mastering display color volume metadata
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 82/100
- Issue type
- Bug
- Clarity
- Clearly specified
- Activity status
- Active
- Tech stack
- cpp
- Domain
- audio-video-rtc
Research direction
Open _studio/mfx_lib/encode_hw/av1/agnostic/base/av1ehw_base_hdr.cpp around lines 42-57 and inspect the clipping of primary_chromaticity/display_primaries values, especially DisplayPrimariesY. Compare the upper bound with the AV1 and referenced AVC/HEVC/VVC specifications. Done means primary_chromaticity_y can reach 0.840000 and DisplayPrimariesY has an upper limit of at least 55050.
Written by the indexing model from the issue text.
Description
The implemented clipping of primary_chromaticity/display_primaries parameters is incorrect as it limits primary_chromaticity_y to the value of 0.762940, but it must be the 0.840000 (according to the range derived from AVC/HEVC/VVC specs).
To meet this requirement the upper limit of DisplayPrimariesY must be at least 55050.
Related specs:
https://aomediacodec.github.io/av1-spec/#metadata-high-dynamic-range-mastering-display-color-volume-semantics
D.2.29 of Rec. ITU-T H.264 (V15) (08/2024), dl link
BTW, AV1 specification does not set limits for HDR MDCV values (other than those determined by syntax).
- Dominant language
- C++
- Stars
- 157
- Forks
- 104
- PR merge metrics
- No merged PRs in 30d
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