id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
781	correct calculation of subpicture layout syntax length	LIJINGYA		"It is suggested to correct calculation of subpicture layout syntax length to cover the cover cases that subpicture width/height = cTbSizeY (Changes are highlighted in '''Bold'''):

subpic_ctu_top_left_x[ i ] specifies horizontal position of top left CTU of i-th subpicture in unit of CtbSizeY. The length of the syntax element is '''Max(1,''' Ceil( Log2('''Ceil(''' pic_width_max_in_luma_samples / CtbSizeY''')''' ) ) ''')''' bits. When not present, the value of subpic_ctu_top_left_x[ i ] is inferred to be equal to 0.

subpic_ctu_top_left_y[ i ] specifies vertical position of top left CTU of i-th subpicture in unit of CtbSizeY. The length of the syntax element is '''Max(1,''' Ceil( Log2( '''Ceil(''' pic_height_max_in_luma_samples / CtbSizeY ''')''' ) ) ''')''' bits. When not present, the value of subpic_ctu_top_left_y[ i ] is inferred to be equal to 0.

subpic_width_minus1[ i ] plus 1 specifies the width of the i-th subpicture in units of CtbSizeY. The length of the syntax element is '''Max(1,''' Ceil( Log2( '''Ceil(''' pic_width_max_in_luma_samples / CtbSizeY ''')''' ) ) ''')''' bits. When not present, the value of subpic_width_minus1[ i ] is inferred to be equal to Ceil( pic_width_max_in_luma_samples / CtbSizeY ) − 1.

subpic_height_minus1[ i ] plus 1 specifies the height of the i-th subpicture in units of CtbSizeY. The length of the syntax element is '''Max(1,''' Ceil( Log2( '''Ceil(''' pic_height_max_in_luma_samples / CtbSizeY ''')''' ) ) ''')''' bits. When not present, the value of subpic_height_minus1[ i ] is inferred to be equal to Ceil( pic_height_max_in_luma_samples / CtbSizeY ) − 1.
"	defect	closed	minor		spec	VVC D7 vE	fixed		ksuehring bbross XiangLi fbossen jvet@…