MainConceptHevcCodec.calculateVmaf property

Compute VMAF while encoding and attach it to each frame’s quality metrics. Expensive (per-frame inference), so off by default. The value is a running mean rather than a strict per-frame score. VMAF is only produced for single-rendition encodes — MainConcept does not emit it for a multi-rendition (ABR ladder) encode, where it is simply absent. MainConcept does not compute SSIM.

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