#1602 closed defect (fixed)
Need clearification for 8.4.3 Derivation process for chroma intra prediction mode
| Reported by: | nuomi | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | spec | Version: | |
| Keywords: | Cc: | ksuehring, bbross, XiangLi, fbossen, jvet@… |
Description
For 12b444vvc1_A_Sony_2.bit, the second decode frame(poc 32), and cu position (64,68)
The treeType is equal to SINGLE_TREE, sps_chroma_format_idc is equal to 3, intra_chroma_pred_mode is equal to 0,and IntraMipFlag[ xCb ][ yCb ] is equal to 1
based on
- If IntraMipFlag[ xCb + cbWidth / 2 ][ yCb + cbHeight / 2 ] is equal to 1, lumaIntraPredMode is set equal toINTRA_PLANAR.
- Table 20
we need set IntraPredModeC to 66, which conflicts with vtm code https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM/-/blob/master/source/Lib/CommonLib/UnitTools.cpp#L734
could you explain why?
thank you.
Attachments (1)
Change history (4)
Changed 18 months ago by bbross
comment:1 Changed 18 months ago by bbross
comment:2 Changed 18 months ago by bbross
- Resolution set to fixed
- Status changed from new to closed
To be fixed as suggested in both the ITU-T and ISO texts for VVC v3.
comment:3 Changed 17 months ago by nuomi
thank you bbross
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Thanks for reporting and this is related to #1558 fixing another bug in the mode derivation for 444.
Indeed, the VTM behaviour for 444 is correct and the attached fix based on the JVET-AD2005 text fixes the issue.