Nope, it's still not reading vmaf_v0.6.1.pkl.
I've got the VapourSynth vmaf filter working though so I'll use that for now.
I really just wanted to see how the VMAF and SSIM measures compare for x264 encoded over a range of CRF values, using a high quality uncompressed source as reference. And also how the LibVMAF derived SSIM 'aggregate' score tallies with the standard FFMPEG SSIM metric 'average' score. This series shows quite a difference:
https://github.com/Netflix/vmaf/issues/22
Cheers.