Session 0026.0 — Transcript

App: human-experience-filter-art Start: 2026-06-27T15-26 (PST) Type: planning-and-executing Posture: yolo Claude-Session: c6b9bebd-f94a-4fc0-982d-0a9dc00b3148 Checkout: /Users/benstull/git/benstull.org/benstull/human-experience-filter-art End: 2026-06-27T18-48 (PST) Status: FINALIZED — merged to main (PR #28) and published at session end.

Launch prompt

Build scrub-driven altitude transitions in the simulator, per the approved design at docs/superpowers/specs/2026-06-27-scrub-driven-altitude-transitions-design.md. Write the implementation plan from that spec, review it, then execute it. Make the Altitude knob position continuously drive the transition: dragging the dial scrubs the morph video's currentTime and crossfades the two adjacent scale soundtracks by knob angle; hold-partway (no auto-complete), fully reversible, re-roll the destination clip on each fresh approach, scroll-wheel auto-scrubs one altitude then locks, lock-per-altitude preserved. Phase 1: build against current morphs. Phase 2: re-bake all 154 morphs all-intra for smooth seeking, re-push via git-LFS. Unit tests for pure scrub logic + extend Playwright E2E.

Plan

Anchor: design docs/superpowers/specs/2026-06-27-scrub-driven-altitude-transitions-design.md (R2a — ELIGIBLE) Session type: planning-and-executing (fused) — write the plan, then execute it, ship via §9.

Scrub-driven altitude transitions. Continuous pos (float) drives morph currentTime + two-soundtrack audio crossfade by frac(pos); integer crossing commits + locks + re-rolls. Phase 1 = interaction against current morphs; Phase 2 = all-intra re-bake (154 morphs, LFS). Pure scrub logic kept separable + unit-tested; Playwright E2E extended to assert currentTime

audio gains track the dial and reverse on turn-back.

Progress (checkpoint @ Phase-1 done)

Plan: docs/superpowers/plans/2026-06-27-scrub-driven-altitude-transitions.md (approved "execute as-is").
Phase 1 DONE (branch session-0026, 5 commits):
- T1 simulator/static/scrub.js (pure UMD math) + simulator/unit/scrub.test.js (9 node --test).
- T2 two-element audio crossfade (<audio id=aud-b>, blendAudio/restAudio/ensurePlaying/assignElements).
- T3 scrub engine: drag live-drives pos; setPos seeks morph currentTime (1 seek/rAF), crossfades audio, commits+locks+re-rolls on integer crossings; release holds (no auto-complete); client-side pickPoolClip.
- T4 wheel + label-tap → autoScrub (animate pos, land exact, lock); removed dead advance()/playTransition().
- T5 E2E scrub tier (6 tests green): drag tracks currentTime+gains, turn-back reverses same file + re-locks start, detent-crossing commits+locks (via window.__hefState seam), wheel auto-scrubs+locks.
Verification: node --test 9 green · pytest 302 passed / 2 skipped · Playwright 6 green.
Phase 2 DONE (T7–T8): transition_cmd/reverse_cmd builders + ALL_INTRA (-g 1 -keyint_min 1 -sc_threshold 0), unit-tested; re-baked all 154 morphs all-intra (verified 93/93 I-frames on a sample), 173M→504M, largest clip ~5.8M; committed via git-LFS and pushed (154 LFS objects, 453MB).
All 8 plan tasks complete. Branch session-0026 pushed. Final verification: node --test 9 green · Playwright 6 green · pytest 302 passed/2 skipped.
Remaining: merge to main + §9. Operator by-eye "feel/smoothness liked?" review is the one acceptance criterion automated tests can't cover (simulator-first directive) — flagged for operator before/at merge.
DECISION (operator): HOLD for eyeball first. Branch session-0026 stays UNMERGED; session NOT finalized. Operator pulls + runs the sim locally to judge the scrub feel/smoothness, then says merge (or requests tweaks).

Eyeball round 1 — operator found 2 issues, both FIXED (2 more commits)

Fix 1 — landing jitter (frontend). Landing jump-cut the loop back to frame 0. Each morph reproduces the dst clip's first 3s (trim=0:3), ending dst@~3s, so steady-state loop now starts at LOOP_TAIL_S=3.0 and loops [3.0, duration] (ensureClipMedia custom loop; disarmed during morph scrub). Morph's last frame hands straight off to the loop. E2E asserts a landed clip loops from ~3s, not 0. No re-bake. (8th E2E test added.)
Fix 2 — red-snapper text card (content). reef_snapper opened with a black NOAA title card (~0.9–2.9s). Re-trimmed reef_snapper/base.mp4 to drop the first 3.0s (23s→20s, footage clean from 3.0s) and re-baked the 7 reef_snapper morph pairs (+reverses, all-intra) from the clean base; verified snapper morph frames text-free.
Verification: Playwright 7 green · all-intra re-confirmed (93/93 I-frames). Pushed to session-0026.
D2 (deferred) — reef_snapper tracked test-label. The trim shifts the footage, so reef_snapper's one loop-normalized tracked label (appear 0.0/disappear 0.7 + 3-keyframe track) is now slightly misaligned to the subject. It's demo/test material gated behind both knobs up; left as-is — re-author via /author.html if the operator wants it pixel-accurate.

Eyeball round 2 — 2 more items, both FIXED (2 commits)

Fix 3 — morph→loop load jolt (double-buffer). A pause/jolt when the morph ended and the next altitude's loop loaded: swapping vid.src to the base + seeking the tail reloaded the ON-SCREEN element (decode+seek stall). Added a dedicated #vid-loop element for the steady-state base loop; during a scrub it is PRELOADED to the clip we're heading toward (loadLoop, paused at the tail frame). The paint shader reads the active source (displayVid() = busy ? vid : loopVid), so landing is an instant source swap — no reload, no seek. E2E asserts the loop element is armed + playing from ~3s after landing.
Fix 4 — audio on/off → 0–10 level dial. Replaced the Audio checkbox with a 0–10 range slider = master gain (audioVol = level/10), scaling rest volume + the two-track scrub crossfade. First Video-on lifts audio to 3/10 (was full). E2E: range 0–10 default 0; first video-on → 3.
Verification: Playwright 9 green · node unit 9 · screenshot-confirmed the dial layout.
D3 residual still applies: double-buffer kills the LOAD pause both directions; the reverse/turn-back FRAME asymmetry (morph src-start@0 vs loop tail@3s) and the ~loop-wrap seek remain (per-clip loop files would fully resolve if wanted).

Eyeball round 3 — audio-off bug (systematic-debugging), FIXED (1 commit)

Bug: audio turned off sometimes after landing on a new altitude. Root cause (code-traced, not guessed): fadeVolume started a setInterval ramp that was never cancelled. restAudio fades the idle element to 0; if within FADE_MS (500ms) that same element becomes the newly-landed ACTIVE scale (assignElements reuses one element per soundtrack url), the stale fade-to-0 kept running and dragged the now-active element to silence — hence "only sometimes." Fix: cancelFade(el) supersedes any in-flight fade when a new fade starts (fadeVolume) or a direct volume is set (ensurePlaying). Added window.__hefFade seam + a deterministic E2E that PROVES it (fails with the fix disabled, passes with it). Playwright 10 green.

Eyeball round 4 — transition speed (1 commit)

Request: slow click/auto transitions ~2x and make them the SAME speed between any two altitudes (2 away = 2× as long as 1). autoScrub was a fixed 600ms total regardless of distance. Now duration is PROPORTIONAL: PER_ALTITUDE_MS=1200 (≈2× the old 600) × |distance|, so a label-click/wheel jump of N altitudes takes N×1200ms — constant per-step speed. Manual drag unaffected. E2E asserts a 2-step jump ≈ 2× a 1-step. 11 green.
Resume: merge + wgl-session-finalize on operator go, OR next eyeball round of tweaks.

Deferred decisions

Autonomous-mode low-confidence calls the driver made and would have liked operator input on. Appended as the session runs; surfaced at finalize. Empty if none.

D1 (plan) — canonical segment morph file. The spec's component 2 says resolve the directed morph via morphByPair["<fromClip>→<toClip>"], but its turn-back decision says "scrubs the SAME morph in reverse" with full reversibility. These are only mutually consistent if a segment uses ONE file scrubbed bidirectionally. I locked the plan to: per segment [lo, lo+1], always use the descend/forward morph morphByPair["<clip@lo>→<clip@lo+1>"] and drive currentTime = frac × duration in both travel directions; the .rev files become unused by the scrub interaction (kept baked for back-compat). This means the old E2E "zoom-out plays a .rev" assertion is replaced by a "turn-back seeks the same file backward" assertion. Low-confidence on whether the operator specifically wanted .rev retained in the drag path.
D2 — reef_snapper tracked test-label misalignment after the text-card trim. Trimming the snapper base by 3.0s (to remove the title card) shifts the footage, so reef_snapper's one loop-normalized tracked label (appear 0.0/disappear 0.7 + a 3-keyframe track) no longer follows the same subject. Left as-is: it's demo/test authoring gated behind both knobs up; re-author via /author.html if pixel-accuracy is wanted.
D3 — landing-jitter fix approach. Chose a frontend loop-from-tail (LOOP_TAIL_S=3.0, custom [3.0, duration] loop) over re-baking morphs or baking dedicated loop clips — cheap, no media churn, eye-tweakable. Residual: a one-seek hitch at each loop wrap (~every 17–20s) and scrub-START (vs landing) is not made seamless (a looping clip is at arbitrary phase when a drag begins). If the wrap hitch bothers the operator, bake per-clip loop files (base[3:end]) for native seamless looping.

Closeout

Shipped. Branch session-0026 (14 commits) → PR #28 merged to main (Gitea merge commit 108e620, branch deleted). Working tree clean on main.

Arc of the session: brainstorming was pre-done (approved design existed) → claimed 0026 (planning-and-executing, yolo) → wrote the implementation plan (reviewed: operator chose "execute as-is") → executed all 8 plan tasks (Phase 1 scrub interaction + Phase 2 all-intra re-bake) → operator held for by-eye review → 4 eyeball rounds of fixes (landing frame, reef_snapper text card, video double-buffer, audio dial + fade-race + transition speed; one bug solved via systematic-debugging with a fails-without-the-fix regression test) → operator said merge → merged + finalized.

§9 pipeline status: localhost + E2E green (11 Playwright + 9 node unit + 302 pytest). This app is simulator-first with no PPE/prod deploy infra (runs locally; hardware/Pi deferred per the standing directive) — no deploy stage to run; the merge is the ship for a locally-run simulator. (Plan archive skipped: app has no content repo in app.json; the plan stays in-repo at docs/superpowers/plans/2026-06-27-scrub-driven-altitude-transitions.md.)

Deferred decisions (also in the section above): D1 canonical-forward-morph-per-segment (scrub same file bidirectionally); D2 reef_snapper tracked test-label misaligned by the trim; D3 reverse/turn-back frame asymmetry + loop-wrap seek (per-clip loop files would fully fix).

Next-session prompt (operator's call — nothing outstanding blocks):

/wgl-planning-and-executing Next HEF polish: pick one of —
  (a) bake per-clip loop files base[3:end] for native seamless looping (fixes the D3
      reverse-landing frame jump + the ~17–20s loop-wrap seek), OR
  (b) continue by-eye scrub/audio feel tweaks, OR
  (c) re-author the reef_snapper tracked label for the trimmed footage (/author.html), OR
  (d) register a content repo in app.json so plans/specs archive at finalize.

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