Opened 4 weeks ago

Closed 8 days ago

Last modified 7 days ago

#700 closed defect (fixed)

Missing spec text integration of JVET-P0580

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

Description

It seems the spec text change in P0580 has been integrated in JVET-P2001-v3 but later removed in JVET-P2001-vC.

The related spec text in JVET-P2001-vC reads follows,

sps_log2_ctu_size_minus5 plus 5 specifies the luma coding tree block size of each CTU. It is a requirement of bitstream conformance that the value of sps_log2_ctu_size_minus5 be less than or equal to 2.

The proposed and adopted spec text in P0580 reads follows,

log2_ctu_size_minus5 plus 5 specifies the luma coding tree block size of each CTU. The value of log2_ctu_size_minus5 shall be less than or equal to 2.
The value of 3 for log2_ctu_size_minus5 is reserved for future use by ITU-T | ISO/IEC.

Change history (6)

comment:1 Changed 4 weeks ago by bbross

  • Version changed from VVC D7 vC to VVC D7 vD

comment:2 Changed 4 weeks ago by bbross

  • Version changed from VVC D7 vD to VVC D7 vE

comment:3 follow-up: Changed 2 weeks ago by yk

I am confused by your comments. The adoption from P0580 only includes "Agreed to reserve value 3 of log2_ctu_size_minus5." Can you clarify?

comment:4 in reply to: ↑ 3 Changed 2 weeks ago by yixindu

Replying to yk:

I am confused by your comments. The adoption from P0580 only includes "Agreed to reserve value 3 of log2_ctu_size_minus5." Can you clarify?

Thanks for your comments. Indeed, the adoption from P0580 only includes reserving value 3 of log2_ctu_size_minus5.

The spec text change regarding this adoption has been integrated in JVET-P2001-v3 as follows:

log2_ctu_size_minus5 plus 5 specifies the luma coding tree block size of each CTU. The value of log2_ctu_size_minus5 shall be less than or equal to 2. The value of 3 for log2_ctu_size_minus5 is reserved for future use by ITU-T | ISO/IEC.

However, in the most recent version JVET-P2001-vE, log2_ctu_size_minus5 was replaced by sps_log2_ctu_size_minus5 and pps_log2_ctu_size_minus5, and the spec text change related to our adoption was removed. Thus, we suggest to add the spec text change to both sps_log2_ctu_size_minus5 and pps_log2_ctu_size_minus5, since they are referring to log2_ctu_size_minus5.

comment:5 follow-up: Changed 8 days ago by yk

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

Thanks for clarification! Now I understand. You are right. Sorry for losing that when integrating the repetition of log2_ctu_size_minus5 in the PPS. I added "The value 3 for sps_log2_ctu_size_minus5 is reserved for future use by ITU-T | ISO/IEC." into the editorial input being prepared by the editors. However, since we have "pps_log2_ctu_size_minus5 shall be equal to sps_log2_ctu_size_minus5." we do not need to add the same for pps_log2_ctu_size_minus5.

comment:6 in reply to: ↑ 5 Changed 7 days ago by yixindu

Replying to yk:

Thank you very much!

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