MaskTools2/mt makediff

Latest revision as of 13:03, 27 October 2014

[edit] Description

mt_makediff subtracts two clips; equivalent to mt_lutxy("x y - 128 +"), but faster.

[edit] Syntax and Parameters

mt_makediff (clip, clip, int "Y", int "U", int"V", string "chroma", int "offX", int "offY", int "w" int "h")

clip   =

Input clip one.

clip   =

Input clip two.

int  Y = 3

int  U = 1

int  V = 1

These three values describe the actual processing mode that is to be used on each plane / channel. Here is how the modes are coded :

• x = -255...0 : all the pixels of the plane will be set to -x.
• x = 1 : the plane will not be processed. That means the content of the plane after the filter is pure garbage.
• x = 2 : the plane of the first input clip will be copied.
• x = 3 : the plane will be processed with the processing the filter is designed to do.
• x = 4 : the plane of the second input clip will be copied.

string  chroma = ""

When defined, the value contained in this string will overwrite the U and V processing modes.

This is a nice addition proposed by mg262 that makes the filter more user friendly. Allowed values for chroma are:

• "process" : set u = v = 3.
• "copy" or "copy first" : set u = v = 2.
• "copy second" : set u = v = 4.
• "xxx", where xxx is a number : set u = v = -xxx.

int  offX = 0

int  offY = 0

offX and offY are the top left coordinates of the box where the actual processing shall occur. Everything outside that box will be garbage.

int  w = -1

int  h = -1

w and h are the width and height of the processed box. -1 means that the box extends to the lower right corner of the video. That also means that default settings are meant to process the whole picture.

[edit] Examples

mt_makediff with default settings:

clip1 = original
clip2 = processed

mt_makediff(clip1, clip2, Y=3, U=1, V=1, chroma="", w=-1, h=-1)

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