TheFeelTrain [1] filed an adoption request for vapoursynth-plugin- hysteresis [2]:
jholmer has orphaned a lot of vapoursynth packages, just picking up the ones I use and can maintain [1] https://aur.archlinux.org/account/TheFeelTrain/ [2] https://aur.archlinux.org/pkgbase/vapoursynth-plugin-hysteresis/
