sylpheed-port read the lead off the disc independently: content fade-outs start
at ptmsg 58, pteff10/pteff12/ptbtn05 60, against the quad's ramp at 70. That
reproduces my measured six-frame lead exactly (12 units = 6 frames) but has
content FINISHING two units before the quad starts, where I had published
overlap.
Checked which draws I had been watching. The content sprites are TEXTURED: they
fade over frames 34-37 and are gone by 39, and the black quad appears at 40 --
a one-frame gap, which is their two units. What overlaps the quad is a
different, UNTEXTURED full-screen quad decaying 255->...->15 across frames
34-41. It is unidentified: build 5 declares only pteff00.prm and a
single-keyframe pteff02.prm, neither of which is that decay. Recorded as an
open observation, not named from one capture.
So the shape is sequence, not overlap.
Also flagged, against my own interest: their "18 vs 19, one unit apart" compares
different intervals (content-start->black vs ramp-start->next screen), and the
capture's frame axis is not phase-locked to the file's unit axis -- the two
plausible alignments differ by two frames with nothing here to distinguish them.
So that agreement holds at one alignment and is not a confirmation. The quad's
alphas (102/127/255) also do not sit on a linear ramp across t=70->80, which is
unexplained.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
d8b71cfb08