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Sylpheed/docs/re/f5-artwork-window-prereg.md
sylph-decoder 306b3a576f re: pre-register the widened F5 artwork test before reading the capture
F5's artwork half rests on 5 frames. This run presses A at the sweep's gate
instead of 40 frames later, giving ~40 frames of still-animating artwork,
and states the prediction for both outcomes before the log is opened.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
2026-09-02 20:09:04 +00:00

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Pre-registration — widening F5's 5-frame artwork window

Committed before the capture is read. F5 concluded Ⓐ forces the plate and leaves the artwork's timeline alone, but the artwork half rested on 5 frames (446450 in f5): the only stretch where the press had landed and something was still animating. Everything else was at α255 and could not discriminate.

This run presses Ⓐ at the sweep's gate insteadPRESS2_FRAMES=3 rather than 40 — so the press lands at title t≈70 with ~40 frames of artwork animation still ahead of it, an 8× wider window.

The prediction

Comparing f5-early against the no-press control f6b, aligned by the sweep's position, over the four quads that are still ramping: 8ECA:-1.00, 8ECA:-0.90, EAC3:-0.82, 8154:-0.74.

if Ⓐ … those four
only forces the plate (F5's claim) continue identically to the control for the full ~40 frames
advances a shared clock terminate early, jump, or change step

A pass is the boring outcome and I have said so first. The failure mode this guards against is that F5's artwork claim was read off a window too short to show a divergence that a longer one would reveal.

What it still will not cover

The plate's identity, the 1.7× clock conflict, and whether Ⓐ drives some third clock — a cut is consistent with several mechanisms.