Hello @ffmpeghelpplease and welcome to the forum!
Download the former version of FFmpeg, because there is an issue in the current version 7.0 from Gyan.dev. So you need to download this version to use it together with Krita:
https://www.gyan.dev/ffmpeg/builds/packages/ffmpeg-6.1.1-essentials_build.zip
Otherwise, if you already have updated to Krita 5.2.?, you don’t need an external FFmpeg anymore, because from 5.2.0 on Krita has its own FFmpeg on board. The path to enter in Krita’s dialog to render animations and timelapses is c:\Program Files\Krita (x64)\bin\ffmpeg.exe
Michelist