id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1507	Clarification questions on VTM compression for collocated motion vectors	iole_moccagatta		"Two clarification questions on VTM compression for collocated motion vectors: 

A) collocated motion vector = +130,048 compresses to 0x00D decompresses to +131,072

This is outside the legal range of 18-bit. There are 3 paths in the code using the decompressed motion vectors: in two paths the clipping is done immediately by 
{{{
rcMv.clipToStorageBitDepth()
}}}
and in the 3rd path the clipping is done by 
{{{
scaleMv()
}}}
forcing to keep the 19-bit precision till that point. '''Is this the intent ?''' 

B) 
{{{
(mantissa ^ MV_MANTISSA_LIMIT)
}}}
is flipping the msb of the 6-bit mantissa. But the msb of the 6-bit mantissa is overloaded, meaning it is used to indicate sign and “units”. '''Is this the intent ?'''
"	defect	closed	major	VTM-14.0	VTM		invalid		ksuehring fbossen bbross iole.moccagatta iole_moccagatta XiangLi jvet@…