Download and install the latest AviSynth+ (with vcredist)
https://github.com/AviSynth/AviSynthPlus/releases
Download the latest MvTools
https://github.com/pinterf/mvtools/releases
Extract x64
from the archive (DePan.dll, DePanEstimate.dll, mvtools2.dll) to C:\Program Files (x86)\AviSynth+\plugins64\
(adjust the avs script if avisynth is not installed in this directory)
In PotPlayer:
Preferences
-> Filter Control
-> Video Decoder
-> Built-in Video Codec/DXVA Settings
-> Use DXVA
-> Checked
-> DXVA2 Copy-Back
-> Select D311 with the GPU
-> Avisynth
-> Enable AviSynth processing
-> Checked
-> Add "potplayer_source()"
-> Checked
-> Leave other checkboxes on default
-> Load Script
-> Select or copy the avs script below
avisynthplus_motion_interp.avs
SetMemoryMax(512)
SetFilterMTMode("DEFAULT_MT_MODE", 2)
SetFilterMTMode("FFVideoSource", 3)
potplayer_source()
LoadPlugin("C:\Program Files (x86)\AviSynth+\plugins64\mvtools2.dll")
super=MSuper(pel=1, hpad=0, vpad=0)
backward_1=MAnalyse(super, chroma=false, isb=true, blksize=32, blksizev=32, searchparam=3, plevel=0, search=3, badrange=(-24))
forward_1=MAnalyse(super, chroma=false, isb=false, blksize=32, blksizev=32, searchparam=3, plevel=0, search=3, badrange=(-24))
backward_2 = MRecalculate(super, chroma=false, backward_1, blksize=8, blksizev=8, searchparam=0, search=3)
forward_2 = MRecalculate(super, chroma=false, forward_1, blksize=8, blksizev=8, searchparam=0, search=3)
MBlockFps(super, backward_2, forward_2, num=60, den=1, mode=2)
Prefetch(4)
Can confirm, especially if I spam left or right arrows to seek back and forth, but it even happens if I just try rewinding back once sometimes.
Perhaps the player/filter doesn't like processing a new part of the video when a previous one hasn't finished processing or something 🤔
There's also SVP 3.1.7 (last free version) which can be GPU-accelerated but you can disable it to use the CPU. I made this script a while ago that sets it up with MPC-HC and Kodi with just a few clicks.
I haven't added PotPlayer yet but you can follow this guide to set it up with ffdshow, or the newer one that uses AviSynth (last time I tried it didn't work so I just used ffdshow).