DeSub – automatic hardcoded subtitles removal

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### DeSub 1.0: removes the subtitles with no need to prepare a mask for every line!     ###
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### Two spatially and aligned clips are needed, one with hardcoded subtitles, or logo,  ###
### and the other without; the script creates a mask "on the fly" that will be used to  ###
### cover the subtitles with the corresponding parts of the clip without them.          ###
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### Usage:   DeSub(clipwithsubs,clipwithoutsubs,subcolor)                               ###
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### Example: goodclip.avi has subtitles, badclip.avi has no subtitles, subs color white ###
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###          DeSub(goodclip,badclip,$ffffff)                                            ###
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### It is highly reccomended to use it only on frames with subtitles                    ###
### Possible update: limit the use to a certain area of the frame, perfect for logo!    ###
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### AviSynth script made by spoRv (https://blog.sporv.com) - Created: 2016-11-29         ###
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### Creative Commons 4,0 - Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)      ###
### Link to the licence page: https://creativecommons.org/licenses/by-sa/4.0/           ###
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function DeSub (clip withsubs, clip nosubs, val "color") {

withsubs=withsubs.converttoyv24
nosubs=nosubs.converttoyv24
color=default(color,$ffffff)

subs = withsubs.converttorgb

mask = ColorKeyMask(subs, color, 20)
blk = blankclip(length=withsubs.FrameCount,width=withsubs.width,height=withsubs.height)

over=Overlay(withsubs, blk, mask=mask.ShowAlpha, mode="blend", opacity=1)

mk=over.levels(235,1,255,1,255)

w=2

a=mk.addborders(0,0,w,w).crop(w,w,0,0)
b=mk.addborders(0,0,0,w).crop(0,w,0,0)
c=mk.addborders(w,0,0,w).crop(0,w,-w,0)
d=mk.addborders(w,0,0,0).crop(0,0,-w,0)
e=mk.addborders(w,w,0,0).crop(0,0,-w,-w)
f=mk.addborders(0,w,0,0).crop(0,0,0,-w)
g=mk.addborders(0,w,w,0).crop(w,0,0,-w)
h=mk.crop(w,0,0,0).addborders(0,0,w,0)

x= overlay(b, f, mode="add")
y= overlay(d, h, mode="add")
xx=overlay(a, e, mode="add")
yy=overlay(c, g, mode="add")
z= overlay(x, y, mode="add")
zz=overlay(xx,yy,mode="add")

nu=overlay(z,zz,mode="add")

mk=nu.levels(235,1,255,1,255)

w=3

a=mk.addborders(0,0,w,w).crop(w,w,0,0)
b=mk.addborders(0,0,0,w).crop(0,w,0,0)
c=mk.addborders(w,0,0,w).crop(0,w,-w,0)
d=mk.addborders(w,0,0,0).crop(0,0,-w,0)
e=mk.addborders(w,w,0,0).crop(0,0,-w,-w)
f=mk.addborders(0,w,0,0).crop(0,0,0,-w)
g=mk.addborders(0,w,w,0).crop(w,0,0,-w)
h=mk.crop(w,0,0,0).addborders(0,0,w,0)

x= overlay(b, f, mode="add")
y= overlay(d, h, mode="add")
xx=overlay(a, e, mode="add")
yy=overlay(c, g, mode="add")
z= overlay(x, y, mode="add")
zz=overlay(xx,yy,mode="add")

nu=overlay(z,zz,mode="add")

mk=nu.levels(235,1,255,1,255)

w=4

a=mk.addborders(0,0,w,w).crop(w,w,0,0)
b=mk.addborders(0,0,0,w).crop(0,w,0,0)
c=mk.addborders(w,0,0,w).crop(0,w,-w,0)
d=mk.addborders(w,0,0,0).crop(0,0,-w,0)
e=mk.addborders(w,w,0,0).crop(0,0,-w,-w)
f=mk.addborders(0,w,0,0).crop(0,0,0,-w)
g=mk.addborders(0,w,w,0).crop(w,0,0,-w)
h=mk.crop(w,0,0,0).addborders(0,0,w,0)

x= overlay(b, f, mode="add")
y= overlay(d, h, mode="add")
xx=overlay(a, e, mode="add")
yy=overlay(c, g, mode="add")
z= overlay(x, y, mode="add")
zz=overlay(xx,yy,mode="add")

nu=overlay(z,zz,mode="add").levels(235,1,255,1,255)

numask = ColorKeyMask(nu.ConvertToRGB32, color, 30)

Overlay(nosubs, withsubs, mask=numask.ShowAlpha, mode="blend", opacity=1)

converttoyv12

}