Opened 4 weeks ago

Closed 5 days ago

#707 closed enhancement (fixed)

Mismatch on context index derivation of transform_skip_flag and mts_idx between WD and SW

Reported by: tsukuba.takeshi Owned by:
Priority: minor Milestone: VTM-7.1
Component: VTM Version: VTM-7.0
Keywords: Cc: ksuehring, XiangLi, fbossen, jvet@…

Description

According to JVET-P2001vD,context index derivation of transform_skip_flag and mts_idx are defined as below:

binIdx
syntax element 0 1 2 3 4 >=5
transform_skip_flag[][][cIdx] cIdx==0 ? 0:1 na na na na na
mts_idx 0 1 2 3 na na

However, in VTM-7.0, context index derivation of transform_skip_flag and mts_idx are defined as below:

binIdx
syntax element 0 1 2 3 4 >=5
transform_skip_flag[][][cIdx] cIdx==0 ? 6:11 na na na na na
mts_idx 0 7 8 9 na na

In addition, unused context indexes (ctxInc = 1 to 5) exist, which should be removed.

Context index derivation in SW should be aligned with WD.

Change history (4)

comment:1 Changed 4 weeks ago by tsukuba.takeshi

Sorry. Following is right description.

According to JVET-P2001vD,context index derivation of transform_skip_flag and mts_idx are defined as below:

binIdx
syntax element 0 1 2 3 4 >=5
transform_skip_flag[][][cIdx] cIdx==0 ? 0:1 na na na na na
mts_idx 0 1 2 3 4 na

However, in VTM-7.0, context index derivation of transform_skip_flag and mts_idx are defined as below:

binIdx
syntax element 0 1 2 3 4 >=5
transform_skip_flag[][][cIdx] cIdx==0 ? 6:11 na na na na na
mts_idx 0 7 8 9 10 na

In addition, unused context indexes (ctxInc = 1 to 5) exist, which should be removed.
Context index derivation in SW should be aligned with WD.

comment:3 Changed 2 weeks ago by Jamaika

Sorry. Something is wrong. B-frames are blurred but compile faster.

comment:4 Changed 5 days ago by fbossen

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