Opened 5 years ago

Closed 4 years ago

Last modified 4 years ago

#758 closed defect (fixed)

spec not aligned with adoption and software on ACT Qp offsets

Reported by: LGE_VCC Owned by:
Priority: minor Milestone:
Component: spec Version: VVC D7 vE
Keywords: Cc: ksuehring, bbross, XiangLi, fbossen, jvet@…


In spec JVET-P2001-vE 8.7.3, Scaling process for transform coefficients, Eq 1133 and 1136, ACT QP offsets are -5 for all components Y, CbCr, Cb, Cr) .

This is not aligned with the the adopted JVET-P0517 and VTM7.1 software, in which ACT QP offsets are -5,-5, -5, -3 for Y, CbCr, Cb, Cr respectively.

Propose to align the spec with the adopted JVET-P0517 and VTM7.1.


Attachments (1)

act_qpOffset_fix.docx (19.6 KB) - added by LGE_VCC 5 years ago.
proposed fix

Download all attachments as: .zip

Change history (4)

Changed 5 years ago by LGE_VCC

proposed fix

comment:1 Changed 5 years ago by xyxiu

As the proponent of JVET-P0517, it is confirmed there is mismatch between the spec and VTM software on ACT QP offsets. We agreed that the spec should be aligned with the software.

comment:2 Changed 4 years ago by bbross

  • Resolution set to fixed
  • Status changed from new to closed

Thanks for reporting!

This has been fixed in JVET-Q2001-v5 with the adoption of JVET-Q0128.

comment:3 Changed 4 years ago by bbross

I meant it was fixed with the adoption of JVET-Q0820 "ACT common text for bug fixes and transform change"

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