Opened 8 years ago

Closed 8 years ago

#72 closed mismatch (fixed)

Bi-prediction disabling for DBBP: A potential bug when the derived direction for merge DBBP is PRED_BI

Reported by: zxgvideo Owned by: tech
Priority: minor Component: 3D-HEVC text
Version: 3D-HEVC Draft Text 4 Keywords: Bi-prediction, DBBP
Cc: tech, jct-3v@…

Description

In the current WD text, I only found the following limitation for the prediction direction of DBBP.
I.7.4.9.6 It is a requirement of bitstream conformance that, when dbbp_flag[ x0 ][ y0 ] is equal to 1, inter_pred_idc[ x0 ][ y0 ] shall not be equal to PRED_BI.
However, the HTM has forced any inherited bi-prediction MV in DBBP to be forward prediction.
I think, a bug-fix should be added on I.8.5.3.2.1, point 14 as following

  1. When predFlagL0 is equal to 1 and predFlagL1 is equal to 1, and ( nOrigPbW + nOrigPbH ) is equal to 12 or dbbp_flag is equal to 1, the following applies:

refIdxL1 = −1
predFlagL1 = 0

Change history (5)

comment:1 Changed 8 years ago by DefaultCC Plugin

  • Cc tech jct-3v@… added

comment:2 Changed 8 years ago by tech

  • Version set to 3D-HEVC Draft Text 4

comment:3 Changed 8 years ago by tech

Fabian, can you confirm this fix?

comment:4 Changed 8 years ago by fabianjaeger

Yes, I can confirm this!

comment:5 Changed 8 years ago by tech

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