okay, made some progress...
if you call "ffmpeg" from CLI because you're either already in that folder or location (of that ffmpeg version) is on Windows PATH, then the relative path to VMAF will work !
but if you call ffmpeg with a fully qualified path (e.g. "d:/path/to/ffmpeg.exe" -i test.mkv.... etc ) then the relative path to the vmaf.pkl will not work... and for whatever reason I cannot seem to get fully qualified paths to the .pkl files working...
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