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New HFR models completely broken for AV1 #1625

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@stderr-to-devnull

Using vmaf_v1.0.16_hfr_3d0h on 59.94 FPS content provides extremely high scores for extremely high CRF values, with results that are predictably devoid of fine details.

At a supposed score of 95.6, the resulting encode has a CRF of 36.5.

For 29.97 content, using the non-HFR model, the score given for nearly transparent encode is 94.6 for a CRF of 29.

So there is zero consistency of VMAF scores across different FPS and models: normal FPS content is underscored while high FPS content is extremely over-scored. These new models are all over the place and provide zero reliability.

Going back to 0.6.1.

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