Opened 4 years ago

Closed 4 years ago

#1246 closed defect (fixed)

C.5.2.1 is confusing

Reported by: fbossen Owned by:
Priority: minor Milestone:
Component: spec Version: VVC D10 vE
Keywords: Cc: ksuehring, bbross, XiangLi, fbossen, jvet@…

Description

C.5.2.1 ends with:

These processes are separately applied for each layer, starting from the lowest layer in the OLS, in increasing order of the nuh_layer_id values of the layers in the OLS.
NOTE – In the operation of output order DPB, same as in the operation of output timing DPB, decoded pictures with PictureOutputFlag equal to 1 in the same AU are also output consecutively in ascending order of the nuh_layer_id values of the decoded pictures.
Let picture n and the current picture be the coded picture or decoded picture of the AU n for a particular value of nuh_layer_id, wherein n is a non-negative integer number.

I am having trouble understanding what "separately applied for each layer" means. Also the last sentence defines "picture n" which appears to never be used.

Suggested text:

These processes are applied for each coded picture that has a value of nuh_layer_id corresponding to one of the layers in the OLS. Coded pictures within an AU are processed in increasing order of nuh_layer_id values.
NOTE – In the operation of output order DPB, same as in the operation of output timing DPB, decoded pictures with PictureOutputFlag equal to 1 in the same AU are also output consecutively in ascending order of the nuh_layer_id values of the decoded pictures.
Let the current picture be the coded picture or decoded picture of the AU n for a particular value of nuh_layer_id, wherein n is a non-negative integer number.

Change history (1)

comment:1 Changed 4 years ago by yk

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

Good catch, thanks! Will be fixed in JVET-S2001-vF as follows:

These processes are applied for each coded picture in the OLS.

NOTE – In the operation of output order DPB, same as in the operation of output timing DPB, decoded pictures with PictureOutputFlag equal to 1 in the same AU are also output consecutively in ascending order of the nuh_layer_id values of the decoded pictures.

Let the current picture be the coded picture or decoded picture of the AU n for a particular value of nuh_layer_id, wherein n is a non-negative integer number.

The first paragraph above can be just simplified as that, because pictures are decoded and processed in decoding order anyway, there is no need to repeat that a particular piece of the process applies in decoding order.

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