>prot_val

fade_clipped.py

import vapoursynth as vs
from vstools import depth, scale_value
core = vs.core

def fade_clipped(src: vs.VideoNode,
                 flt: vs.VideoNode,
                 lower: float = scale_value(16, 8, 32, scale_offsets=True),
                 upper: float = scale_value(235, 8, 32, scale_offsets=True),
                 amount: float = scale_value(10, 8, 32, scale_offsets=True)) -> vs.VideoNode:
    diff_upper = f"{upper} x -"
    diff_lower = f"x {lower} -"
    greater_upper = f"{diff_upper} {amount} >"
    greater_lower = f"{diff_lower} {amount} >"
    strength_lower = f"{amount} {diff_lower} - {amount} /"
    strength_upper = f"{amount} {diff_upper} - {amount} /"
    fade_lower = f"{strength_lower} x * 1 {strength_lower} - y * +"
    fade_upper = f"{strength_upper} x * 1 {strength_upper} - y * +"
    expr = f"{diff_upper} 0 <= {diff_lower} 0 <= or x {greater_upper} {greater_lower} y {fade_lower} ? {fade_upper} ? ?"
    return depth(core.std.Expr([depth(src, 32), depth(flt, 32)], expr), flt.format.bits_per_sample)