There is also this Doggie-Doo mod of Didee / JohnM script[FillMissing]:-
https://github.com/Dogway/Avisynth-S...llMissing.avsi
As well as JKyle mod [with wrong black/white frame colors]:-
https://forum.doom9.org/showthread.p...24#post1947624
EDIT: Doggy uses Color_YUV=$000000, and Color_YUV=$FFFFFF which are also a bit wrong,
should be (for 8 bit ONLY)
Black = BlankClip( source, Color_yuv=$008080 )
White = BlankClip( source, Color_yuv=$FF8080)
[color_YUV AVS+ only]
Maybe use (where masktools 2 used already)
Black=source.mt_lut("0")
White=black.mt_Invert() # OK for HBD, eg 16 bit Y becomes $FFFF, not $FF00 (FULL WHITE required for Mt_merge mask).