Opened 4 weeks ago

Last modified 4 weeks ago

#685 new defect

Mismatch between spec and VTM code for cu_sbt_flag context assignment

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

Description

In VVC draft 7 version 8, the context index for cu_sbt_flag signaling is defined as: ( cbWidth * cbHeight < 256 ) ? 1 : 0

while in VTM7 source code, it is assigned as: "uint8_t ctxIdx = ( cuWidth * cuHeight <= 256 ) ? 1 : 0;"
(methods CABACWriter::sbt_mode and CABACReader::sbt_mode)

Proposal: align the spec on the source code.
The two methods have same BD-rate performances (0% on average in RA and LDB)

Change history (3)

comment:1 Changed 4 weeks ago by bbross

  • Version set to VVC D7 vC

comment:2 Changed 4 weeks ago by bbross

  • Version changed from VVC D7 vC to VVC D7 vD

comment:3 Changed 4 weeks ago by bbross

  • Version changed from VVC D7 vD to VVC D7 vE
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