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Miguel Angel Simon Sierra
596d822117
The documented caveat was wrong. Probing which reference frame the live seek lands on shows it lands exactly on the right one (peak SSIM at frame 210 for t=7, falling off on both sides), so there is no seek drift to work around. The real floor is the decode gap: a replica is a live browser paint, a reference is a decoded compressed video. Flat graphics self-compare at 0.998-0.999; photographic video sits near 0.93 at high quality and 0.89 at draft, and most of that is a uniform level shift rather than a structural error. Adds meanSignedDiff so that shift is a number instead of an eyeball call on the overlay, printed as 'diff X% (bias +Y%)', and replaces the caveat with the measured per-content floors.
