id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
440	Issue on cu_skip_flag	wangyang.cs		"There is one issue on cu_skip_flag in current VVC draft (JVET-O2001-vE). In the draft described below, when (slice_type == I && treeType == SINGLE_TREE && sps_ibc_enabled_flag == 1 && (cbWidth > 64 || cbHeight > 64), cu_skip_flag will be parsed.

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7.3.8.5	Coding unit syntax
coding_unit( x0, y0, cbWidth, cbHeight, cqtDepth, treeType, modeType ) {
	chType = treeType = = DUAL_TREE_CHROMA? 1 : 0
	if( slice_type  !=  I  | |  sps_ibc_enabled_flag  | |  sps_palette_enabled_flag) {
		if( treeType != DUAL_TREE_CHROMA  &&  
		  !( ( ( cbWidth = = 4 && cbHeight = = 4 )  | |  modeType = = MODE_TYPE_INTRA ) 
			  &&  !sps_ibc_enabled_flag ) )
			cu_skip_flag[ x0 ][ y0 ]
----
However, largest IBC luma CU size has been limited to 64x64.
The modified draft is described as follows:

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7.3.8.5	Coding unit syntax
coding_unit( x0, y0, cbWidth, cbHeight, cqtDepth, treeType, modeType ) {
	chType = treeType = = DUAL_TREE_CHROMA? 1 : 0
	if( slice_type  !=  I  | |  sps_ibc_enabled_flag  | |  sps_palette_enabled_flag) {
		if( treeType != DUAL_TREE_CHROMA  &&  
		  !( ( ( cbWidth = = 4 && cbHeight = = 4 )  | |  modeType = = MODE_TYPE_INTRA ) 
			  &&  !(sps_ibc_enabled_flag && cbWidth <= 64 && cbHeight <= 64 ) ) )
			cu_skip_flag[ x0 ][ y0 ]
----
"	defect	closed	blocker	VVC D10	spec	VVC D9 vB	fixed	cu_skip_flag, IBC CU size	ksuehring bbross XiangLi fbossen jvet@… jvet@… wangyang.cs@…