Build never-cheap, motion-crafted promo videos as Remotion compositions — cinematic HyperFrame-style clips (3D poster cubes, capsule theme-flips, architecture data-pulse, particle-burst photo albums) and vertical short-video for 抖音/小红书/视频号. frame-smith is the DIRECTOR, not the renderer: it reads the brief, sets the register (landscape cinematic vs. vertical short), picks ONE effect engine done at 100%, lays a beat timeline, writes the .tsx, and registers it in the Remotion Root. It runs ON TOP OF a video runtime — it needs the `hyperframe` OR the `remotion` skill installed, checks for them FIRST (§0), and guides install if neither is present. Ships a motion craft floor (30fps, second→frame helper, S-scale for vertical, 抖音 safe zones, easing library, export三件套), an effect-engine catalog lifted from shipped HyperFrames, a beat-timeline architecture, and a motion anti-slop blacklist (no everything-fades-up, no linear easing, no janking engine). Supports verb commands (craft · env · beats · engine · restage · slo
Installer avec Codex ou Claude Copiez ce prompt, collez-le dans Codex, Claude ou un autre assistant, puis laissez-le vérifier la page du skill et l'installer pour vous.
Une commande directe contourne le prompt de vérification. Examinez la source avant de l'exécuter.
Build never-cheap, motion-crafted promo videos as Remotion compositions — cinematic HyperFrame-style clips (3D poster cubes, capsule theme-flips, architecture data-pulse, particle-burst photo albums) and vertical short-video for 抖音/小红书/视频号. frame-smith is the DIRECTOR, not the renderer: it reads the brief, sets the register (landscape cinematic vs. vertical short), picks ONE effect engine done at 100%, lays a beat timeline, writes the .tsx, and registers it in the Remotion Root. It runs ON TOP OF a video runtime — it needs the `hyperframe` OR the `remotion` skill installed, checks for them FIRST (§0), and guides install if neither is present. Ships a motion craft floor (30fps, second→frame helper, S-scale for vertical, 抖音 safe zones, easing library, export三件套), an effect-engine catalog lifted from shipped HyperFrames, a beat-timeline architecture, and a motion anti-slop blacklist (no everything-fades-up, no linear easing, no janking engine). Supports verb commands (craft · env · beats · engine · restage · slower|faster · register · audit). Triggers on "做个视频", "视频动效", "promo video", "motion graphics", "Remotion 合成", "HyperFrame", "片头动画", "产品宣传片", "3D 立方体动画", "粒子相册", "数据可视化视频", "竖屏短视频", "抖音视频", "小红书视频", "opener animation", "转场", "beat timeline", "把这个页面做成视频", "/frame-smith".
frame-smith — Motion-Crafted · Effect-Engine-Driven · Never Cheap
frame-smith is a director, not a renderer. It decides what the video is — register, effect engine, beat timeline, motion craft — and writes a Remotion composition (.tsx) that a video runtime renders. It does not own the runtime. The runtime is the hyperframe skill (the effect-template library, carries its own Remotion) or the remotion skill (the bare runtime + scaffolding). frame-smith needs exactly one of them present and checks first (§0).
frame-smith builds two registers and routes by them (§0.A):
cinematic — a landscape HyperFrame clip, 1920×1080 · 30fps · 12–24s, pure visual, no voiceover. Optimize for one spectacular effect engine + a tight beat arc + a wordmark payoff. This is the register of the four engine archetypes (Poster-cube tumble, Capsule theme-flip, Architecture data-pulse, Particle-burst album).
short — a vertical short-video, 1080×1920, for 抖音/小红书/视频号. May carry subtitles / voiceover. Optimize for hook in the first 1.5s + readable-inside-safe-zone + rhythm cut to narration. Obeys the S = width/720 scale system and the 抖音 safe zones.
The through-line is identical: high motion craft, zero motion-slop. What applies to both is the motion craft floor (references/motion-floor.md — 30fps, the f(sec) second→frame helper, clampOpts, the export三件套, easing over linear, terminal-frame discipline) and the anti-cheap-motion blacklist (§6). What forks is orientation, safe-zone math, and whether copy is on screen.
Every rule below is contextual. Nothing fires automatically. Read the brief, set the register, then pull only the engine that fits. A skill that ships the same fade-up-slide-in clip for every brief has failed — that is the slop.
How to use this skill
0. ENVIRONMENT FIRST — this is a hard gate, not a suggestion. Before anything else, confirm a video runtime is present. frame-smith writes compositions but cannot render them alone. Load references/environment.md and run its check: at least one of the hyperframe or skills must be available.
remotion
Neither present → STOP. Do not write any .tsx. Surface the two install options (prefer hyperframe — it carries the effect templates you'll lift from; remotion is the leaner runtime-only path) and wait. environment.md has the exact detection steps and install/bootstrap guidance.
One present → note which (it decides where the composition file lands and how you register + preview it), then proceed.
Run §0 Brief Read — infer the register (cinematic vs. short) and the one-line intent before touching code. Name the lazy default and reject it. Output a short Frame Read, then stop for confirmation.
Set the §1 Three Dials (ENERGY · SPECTACLE · DENSITY). Short register pins DENSITY toward legibility; cinematic pins SPECTACLE high.
Lay the motion craft floor (references/motion-floor.md) — the same for both registers: 30fps, const f = (s) => Math.round(s*FPS), clampOpts, easing library, the export三件套 (Component / ComponentCover / COMPONENT_FRAMES). Then the orientation substrate forks: cinematic → 1920×1080, no safe-zone tax, wordmark grammar; short → 1080×1920, S = width/720 scale on every pixel, 抖音 safe zones, subtitle rhythm.
Pick ONE effect engine from references/effect-catalog.md — the engine is the video's soul. One, done at 100%, not three at 40%. The catalog is organized by the four engine archetypes plus their reusable sub-effects (3D CSS solids, stadium/pill mask theme-flip, trapezoid data envelopes + counters, SVG stroke-writing + particle burst + 3D ring). Match engine to intent; don't reach for the same one every time.
Lay the beat timeline (references/beat-structure.md) — a video is beats, not a page. Fix H0…Hn boundaries in seconds, give each beat one job, and make the last beat land (wordmark, logo, CTA). Pick the narrative skeleton for the register.
Choreograph the reveals (references/reveals.md) — how text and elements enter and exit is the readable surface of the whole clip. Vary the vector, stagger the siblings, mask the edge, give the hero its own move. The #1 slop is everything fading-up together.
Score it — sound design (references/sound-design.md) — sound is half the craft, and it is not optional on cinematic either (no voiceover ≠ no sound). Choose a BGM matched to ENERGY + genre with head/tail fades; place 3–6 SFX to accent the key beats; and lock audio-visual sync — every SFX and the BGM drop land on the same beat frame as their picture. This is the highest-leverage "feels professional" move in the skill.
Write the composition, then register it (references/registration.md) — the export三件套, the <Composition> + <Composition ...Cover> pair in the Root, correct durationInFrames / fps / width / height. An unregistered composition is invisible in Studio and unrenderable.
Run the anti-cheap-motion blacklist (references/anti-cheap-motion.md) and pre-flight (references/preflight.md) before declaring done — the reduced-motion / terminal-frame check, the reveal + sound checks, and a Studio preview or still render to prove it moves. Then read it against the good-video rubric (references/showcraft.md) — the four layers (engine · rhythm · reveals · sound) + sync — and fix by the lowest-scoring layer, not by piling more onto a strong one.
The references/*.md files are the deep material. Load the one you need for the current phase — do not inline all of them.
Reference
When to load
environment.md
§0, before anything else — the hard gate. How to detect whether the hyperframe or remotion skill is available, what each provides, where a composition file lands under each, how to preview/render, and the install/bootstrap path when neither is present. Also: how to fall back to a Remotion project already on disk
motion-floor.md
Every build, both registers — the universal craft floor: 30fps, the f(sec) helper, clampOpts, the S = width/720 scale system (vertical) + 抖音 safe zones, the easing library (Easing.out(cubic/exp/back), spring), the trapezoid/envelope helpers, the export三件套 naming, and terminal-frame discipline (a clip must hold a clean last frame + a still …Cover)
effect-catalog.md
Step 4 — picking the engine. The effect-engine vocabulary lifted from the four shipped HyperFrames, each with its signature technique, when to use it, and the reusable sub-effects: CSS-3D solids (cube/ring/card-stack), stadium/pill mask theme-flip, piecewise-pose timelines with drift, trapezoid data envelopes + big-number counters + network lines + gallery wipes, SVG stroke-writing + particle burst + spring-overshoot matrix. Plus the editorial overlay kit (ruler grid, corner labels, crosshair, accent-line outro)
effects-menu.md
The user-facing "à la carte" menu (视频动效清单). A browsable, non-technical list of every effect the skill can do — engines · reveals · transitions · overlays · 3D · sound — each with "what it looks like" + "how to ask for it" in Chinese. Load it to show the user their options (during the Frame Read, or when they ask "有哪些效果/what can you do"), or to parse a user who点名点了具体效果. It routes into the deep files below
beat-structure.md
Step 5 — the timeline. How to think in beats not sections: fixing H0…Hn in seconds, one job per beat, the hook-in-1.5s rule (short) and the wordmark-payoff rule (cinematic), the narrative skeletons per register, and how to make the last beat land instead of just stopping
reveals.md
Step 6 — text & element entrance/exit choreography. The positive catalog: masked line rise, per-char/word/line reveals (granularity must match text length), clip-path wipe, blur/focus-pull, scale-pop overshoot, SVG stroke-writing; stagger discipline, the hero's distinct move, and exit choreography (enter × (1−exit)). Load it whenever text or a set of elements comes on screen
sound-design.md
Step 7 — background music, transition SFX, mix & sync. Remotion <Audio>/<Sequence> mechanics; BGM matched to ENERGY+genre with head/tail fades; the SFX→beat map (whoosh/impact/click/riser); ducking under voiceover; and the audio-visual sync discipline (every SFX + BGM drop on a beat constant). Load it on every clip that will have sound — which is every clip
registration.md
Step 8 — making it real. The export三件套 contract, the <Composition> + …Cover pair, durationInFrames = COMPONENT_FRAMES, choosing the Folder, the cover-still convention (height 1440 for a taller poster crop), and how to preview in Studio / render a frame
anti-cheap-motion.md
Before any delivery — the motion anti-slop blacklist: everything-fades-up-together, linear easing, uniform 0.5s durations, no overshoot/anticipation, engine that janks or cuts off mid-motion, dead-air beats, a last frame that just freezes with no payoff, top/left/width/height animation instead of transform/opacity, plus the audio anti-slop (stock bed, genre mismatch, SFX carpeting, out-of-sync)
showcraft.md
The quality rubric — what counts as good, not just not-broken. The four layers a high-craft clip needs in balance (engine · rhythm · reveals · sound) + the sync connective tissue, a 10-point score, and the one-line test ("muted, does it read? eyes closed, does it sound like this video? do they meet on the same frames?"). Read it when a clip "feels off" but pre-flight passes, during audit, or to decide which layer to lift
assets.md
Brief needs real imagery, fonts, or audio — staticFile() vs. absolute-URL assets, the font-loading roads, where assets live under each runtime, objectFit discipline, and the generate-vs-source-vs-placeholder decision with its authorization step
preflight.md
Final checklist before "done" — merges the craft-floor check, the anti-slop scan, the reveal + sound checks, the safe-zone check (short), the registration check, the reduced-motion terminal state, and the "prove it moves" step. If any hard rule fails, it is shipping broken
Commands
frame-smith runs as a full build by default, but supports verb commands for targeted iteration on an existing composition — so you don't re-run the whole Brief Read for a single change. Each command loads one reference and does one job.
Command
Category
Does
Reference
craft [brief]
Build
The full flow: env gate → Frame Read → dials → floor → engine → beats → register (the default)
all
env
Setup
Run only the §0 environment gate — report which runtime is present, or lay out the install path if neither is
environment.md
engine [target]
Refine
Swap the effect engine when this clip is the wrong soul — re-pick from the catalog, keep the beats
effect-catalog.md
beats [target]
Refine
Re-cut the timeline — move Hn boundaries, add/drop/reorder a beat, fix a dead-air stretch, without touching the engine
beat-structure.md
reveals [target]
Refine
Re-choreograph how text/elements enter & exit — de-uniform the entrances, stagger, give the hero its own move, add exits
reveals.md
sound [target]
Refine
Re-score the audio — swap/re-fit the BGM, re-place the SFX on beats, fix ducking or audio-visual sync
sound-design.md
restage [target]
Iterate
Upgrade an existing composition, audit-first; never full-rebuild for one complaint
anti-cheap-motion.md + preflight.md
slower [target]
Refine
Stretch the timeline / raise easing softness / cut ENERGY — calm a frantic clip
motion-floor.md
faster [target]
Refine
Compress the timeline / tighten holds / raise ENERGY — wake up a sluggish clip
motion-floor.md
register [target]
Iterate
Re-orient landscape↔vertical: re-lay the safe-zone / scale substrate, re-fit the engine to the new aspect
motion-floor.md
audit [target]
Evaluate
Read-only diagnostic: run the anti-slop blacklist + pre-flight + the "prove it moves" check, output findings. Changes nothing.
anti-cheap-motion.md + preflight.md
Routing rules
First word matches a command → load that command's reference and follow it. Everything after is the target. The §0 env gate still runs first for any command that writes or renders (craft, engine, beats, reveals, sound, restage, slower, faster, register) — you cannot edit a composition into a runtime that isn't there. env and audit may run without it.
First word doesn't match, but intent clearly maps ("feels frantic / too much" → slower; "too flat / boring / dead" → faster; "wrong effect / this vibe is off" → engine; "the timing is off / drags in the middle" → beats; "text all comes in the same way / entrances are boring" → reveals; "wrong music / 换配乐 / 音效不对 / 音画不同步" → sound; "make it vertical / 竖屏 / for 抖音" → register; "improve / fix this clip" → restage; "is this any good / review it" → audit) → route there. If two fit, ask once.
No argument at all (bare /frame-smith) → the user is asking "what should I do here?" Read cheap signals and lead with the 2–3 highest-value picks, each with a one-line reason. Signal → pick:
no runtime detected → lead with env (nothing else works until a runtime is present).
runtime present, nothing built → craft (name the register you'd default to).
an existing composition in the working tree → scope audit or restage to it, naming the file.
Keep it to 2–3 pointed picks. The table is the fallback, not the lede.
A target but no command, building new → run the full craft flow (§0 env gate → §8), the default for "make me a promo video / a HyperFrame clip".
env and audit are read-only.env reports runtime status and never writes; audit reports findings and never edits. Every other command may modify the target.
Auto-trigger is unchanged: frame-smith still activates from natural language via its description. Commands are an added precision entry-point, not a replacement.
0. THE ENVIRONMENT GATE (Before Anything Else) · hard requirement
frame-smith cannot ship a video on its own. It writes a Remotion composition; something has to host and render it. That something is one of two skills:
Runtime skill
What it provides
frame-smith writes into
hyperframe
The effect-template library (the shipped HyperFrames) plus its own Remotion project. The richer path — you lift patterns from effect-catalog.md's source frames directly.
its src/compositions/HyperFrames/ (or the folder it exposes)
remotion
The bare runtime — scaffolding, remotion studio, remotion render, the <Composition> registry — without the template library. The leaner path.
its src/compositions/
The check (full steps in references/environment.md):
Look for the two skills in the available-skills listing and on disk (project .claude/skills/, ~/.claude/skills/, installed plugins). At least one must be present.
Neither present → STOP. Write nothing. Report it plainly and offer the install path: recommend hyperframe first (it carries the effects), remotion as the runtime-only alternative. If the user already has a Remotion project on disk but no skill, environment.md covers pointing frame-smith at it directly as a fallback (ask for the path — never assume it).
One present → record which, because it decides the target directory, the registration file, and the preview/render command. Then continue to §0.A.
Do not soften this gate. Writing a beautiful composition into a project with no Remotion installed produces a file the user cannot run — that is a worse outcome than stopping and asking.
0.A Determine the Register (this forks orientation, safe zones, and copy)
cinematic — a landscape HyperFrame clip: 1920×1080 · 30fps, ~12–24s, pure visual, no voiceover, ends on a wordmark/logo payoff. This is the default when the brief says "宣传片 / opener / 片头 / showcase / HyperFrame / 电影感" or names one of the four reference frames. Route: heavy effect engine (§4), no safe-zone tax.
short — a vertical short-video: 1080×1920, for 抖音/小红书/视频号, may carry subtitles + voiceover, hook must land in the first ~1.5s. This is the register when the brief says "竖屏 / 抖音 / 小红书 / 短视频 / 口播 / 带字幕". Route: S = width/720 scale on every pixel, 抖音 safe zones, subtitle rhythm (motion-floor.md).
If the brief doesn't say, ask ONE question — orientation changes every downstream number, so guessing wrong is expensive: "这个视频是横屏电影感片头（无旁白），还是竖屏短视频（可能带字幕/口播）？" Wait for the answer.
0.B Output a "Frame Read" before generating — assert a direction, don't poll
Name the rejected default first, then the direction. Three lines:
Lazy default (rejected): logo fades in, three feature cards slide up one after another, soft synth.
Frame Read: developer-tool launch · precise + kinetic · register=cinematic ·
engine=poster-cube tumble · duration=15s · ENERGY=6 SPECTACLE=8 DENSITY=4
Beats: 0.0 ruler+labels in → 2.9 cube enters → 3.7 tumble → 10.0 drift+wordmark → 12.6 accent flash outro
STOP after the Frame Read. Do not generate any code yet. Wait for confirmation or redirect. Assert the direction and invite a veto ("going with the cube unless you'd rather I push it toward a data-pulse read"). Do not hand the user a menu of adjectives — nobody picks a motion from words. If the brief genuinely forks (a launch that could be a hard-kinetic cube or a warm particle album), describe the two and let them choose one.
0.C Anti-Default Discipline
Name the motion cliché for this brief, then beat it. "Product launch → the default is logo fade + three cards sliding up in sequence + soft riser. I'm rejecting that for {a real effect engine with a beat arc}." The single most-tested motion tell is everything entering the same way (fade + translateY, linear or a single soft ease, all at once). See references/anti-cheap-motion.md.
0.D Quick-Start Dial Mapping
Brief cue
ENERGY
SPECTACLE
DENSITY
"电影感 / cinematic / 高级"
5
8
3
"科技 / 数据 / dashboard 视频"
6
7
7
"温暖 / 回忆 / 相册 / 情感"
4
7
4
"活力 / 潮 / 撞色 / 年轻"
8
6
5
"简约 / 克制 / 品牌片头"
3
5
2
"抖音 / 短视频 / 口播带字幕"
6
4
5
"产品发布 / launch / opener"
6
8
4
Override immediately if the brief provides stronger signals.
1. THE THREE DIALS
Set these explicitly from the Frame Read. They drive tempo, engine ambition, and how much is on screen.
Dial
1–3
4–6
7–10
ENERGY — tempo & attack of the motion
slow, floated, long holds, soft eases
measured, clear beats
fast cuts, overshoot, snappy back/exp eases, tight holds
SPECTACLE — how technically-ambitious the effect engine is (frame-smith's signature dial)
CSS transforms + fades
staggered reveals, one 3D moment, Canvas accents
full CSS-3D solid, particle systems, mask theme-flip, camera sway, motion blur
If SPECTACLE ≥ 7, the clip MUST actually contain a working engine (a real CSS-3D solid, a particle burst, a mask theme-flip, a counter/network build) that holds through its beat and lands a clean terminal frame — not a gradient that pulses. A clip that claims SPECTACLE 8 but ships crossfades is broken. If you can't ship working spectacle in scope, drop the dial to 4–5 and ship an impeccably-timed simpler clip instead. Never half-build an engine that janks or cuts off mid-motion — an interrupted 3D tumble reads cheaper than no 3D at all.
2. PICK ONE EFFECT ENGINE (the video's soul) · references/effect-catalog.md
A video's identity is its one engine, executed fully. The catalog is organized around the four shipped reference frames — treat them as validated combinations, not a menu to copy verbatim.
Engine
Use when
Signature technique
Poster-cube tumble
many small visuals (posters, shots, thumbnails), editorial/design brand, "portfolio / studio / gallery"
photos, memories, emotional/warm, "our year / our story", personal
SVG stroke-writing title + particle burst, 3D ring carousel with depth-of-field + camera sway, card-stack suck-in with motion blur, spring overshoot explode
Discipline (mandatory):
One engine per clip. Don't stack a cube and a ring and a data-pulse. Reusable sub-effects (a counter, a wipe, an overlay grid) can garnish, but there is one load-bearing engine.
Progressive enhancement of legibility. If the engine were frozen on any frame, the frame should still read. The engine carries motion, not meaning-of-last-resort.
60fps or simplify. Animate transform/opacity only; never top/left/width/height. Below smooth, cut particle count / face count / resolution — don't ship jank.
Terminal frame is designed, not incidental. The engine resolves to a composed still that the …Cover export can freeze (see motion-floor.md + registration.md).
3. THE MOTION CRAFT FLOOR (why it reads as expensive) · references/motion-floor.md
The difference between a cheap clip and an expensive one is mostly timing discipline, applied consistently. Non-negotiables (full recipes in the reference):
30fps, and time is authored in seconds.const FPS = 30; const f = (s) => Math.round(s*FPS); — every beat boundary and delay is f(seconds), never a raw frame count guessed by hand.
interpolate always clamps.const clampOpts = { extrapolateLeft: 'clamp', extrapolateRight: 'clamp' }; on every interpolate that maps a time range — an unclamped ramp keeps moving past its beat and is the #1 cause of drift.
Easing over linear. Entrances Easing.out(cubic/exp), overshoot Easing.out(back(…)) or spring, holds are real holds (flat segments in a piecewise interpolate). linear on a visible move is a tell.
Vertical obeys the scale system.const S = width/720; and every absolute pixel (fontSize, top, padding, borderRadius) is × S. Landscape at fixed 1920 does not need it, but keep the values proportional.
Vertical obeys the 抖音 safe zones — top ≥ 160px, bottom ≥ 220px, left ≥ 44px, right ≥ 120px (1080p). Content outside is covered by platform UI. (Landscape has no safe-zone tax.)
The export三件套 — every composition exports Component, ComponentCover (a still, usually a taller crop), and COMPONENT_FRAMES (the duration constant). This is the contract registration.md consumes.
Author motion the way a page authors color: pick the easing/tempo vocabulary once, lock it, and don't let a single element drift into linear + 0.5s-uniform like everything the model has seen most.
4. BEAT TIMELINE — a video is beats, not a page · references/beat-structure.md
Fix the beats in seconds before writing render code. Each beat has one job; the boundaries are named constants.
The first beat earns the next second. Cinematic: the engine or its promise is on screen fast; a 3s empty runway loses the frame. Short: the hook lands by ~1.5s or the viewer swipes.
One job per beat. A beat that both introduces the product and flips the theme and runs the counters is three beats crushed into one — the eye can't parse it.
The last beat lands. A clip that just stops on its last engine frame feels unfinished. End on a designed payoff: the wordmark settling, the logo resolving, the accent line flashing, the matrix collapsing to a title. This frame is also your …Cover still.
No dead air. Every beat is either moving or holding-with-intent. A stretch where nothing changes and nothing is deliberately held is a cut you owe the viewer.
Narrative skeletons per register live in the reference (cinematic: cold-open → engine build → peak → wordmark; short: hook → point → proof → payoff, cut to narration). Motion-motivated only — every move needs a one-sentence reason.
5. WRITE & REGISTER · references/registration.md
Writing the .tsx is not the end — an unregistered composition doesn't exist in Studio and can't render.
Export三件套:export const X_FRAMES = HEND;, export const X: React.FC = () => {…}, export const XCover: React.FC = () => <Scene frame={f(peakSecond)} />;. The cover freezes the most composed frame.
Register the pair in the runtime's Root: a <Composition id="X" … durationInFrames={X_FRAMES} fps={30} width={…} height={…} /> and a <Composition id="XCover" … durationInFrames={1} … height={taller-crop} />, inside the right <Folder>.
Preview or render to prove it moves — open it in remotion studio, or render a still/short range. A composition you never previewed is a composition you haven't finished (§8).
6. THE ANTI-CHEAP-MOTION BLACKLIST · references/anti-cheap-motion.md
Before declaring done, scan against the reference. The headline offenders:
Everything enters the same way — fade + translateY on every element, all at once. The #1 motion tell. Stagger, vary the vector, give the hero its own move.
linear easing on any visible move, and uniform 0.5s durations everywhere — motion with no dynamics reads as a slideshow.
No overshoot / no anticipation — nothing ever springs past and settles; everything glides to a dead stop. Flat.
An engine that janks or cuts off mid-motion — a 3D tumble that stutters, a particle burst that pops out, a mask sweep that tears. Worse than not attempting it.
Dead-air beats and a last frame that just freezes with no designed payoff.
Animating top/left/width/height instead of transform/opacity — the jank source.
Subtitles/CTA outside the 抖音 safe zone (short) — clipped by platform UI.
Reused stock motion — the exact ScrollReveal-style fade-up-stagger from every template gallery. Earn the motion.
7. PERFORMANCE & CORRECTNESS GUARDRAILS
Animate transform/opacity only. Never top/left/width/height.
Every interpolate over a time range clamps (clampOpts). Piecewise pose channels must be monotonic in their input array.
durationInFrames must equal the exported X_FRAMES; a mismatch cuts the clip or leaves dead tail.
Assets via staticFile() or a stable absolute URL (assets.md) — never a bare relative path that breaks in render.
Reduced-motion / terminal frame: the clip must resolve to a clean, composed last frame (the payoff) that the …Cover can freeze. A still viewer must get a finished poster, not a mid-transition smear.
Vertical: S-scale every pixel; keep content inside the safe zones; subtitles split by punctuation and switch on the narration beat (motion-floor.md).
8. PRE-FLIGHT CHECK · references/preflight.md
Run the full checklist before saying "done." It merges the craft-floor check, the anti-slop scan, the safe-zone check (short), the registration check, the reduced-motion/terminal-frame state, and the prove-it-moves step (Studio preview or still render). If any hard rule fails, it is shipping broken work — fix before delivery.
8.A POST-DELIVERY ITERATION GUIDE
Map feedback to the targeted fix. Never rebuild from scratch for one complaint.
User says
Command
Action
"too frantic / too much"
slower
Stretch the timeline, soften eases, lower ENERGY
"too flat / boring / dead"
faster
Compress holds, add overshoot, raise ENERGY
"wrong effect / vibe is off"
engine
Re-pick from effect-catalog.md, keep the beats
"timing's off / drags in the middle"
beats
Re-cut Hn boundaries, kill the dead-air beat
"make it vertical / 竖屏 / 抖音"
register
Re-lay scale + safe zones, re-fit the engine
"the ending's weak"
beats
Redesign the payoff beat; make the last frame land
"it janks / stutters"
restage
Move to transform/opacity, cut particle/face count, re-check 60fps
frame-smith is a motion director for Remotion compositions. Hand off when the work is: live-action video editing (no code), a pure audio task, a static image/poster (that's a design-skill job, not motion), or anything that needs a video runtime frame-smith's §0 gate can't find and the user won't install. It does not own the runtime — if there is no hyperframe/remotion skill and no Remotion project on disk, frame-smith's job is to say so and guide install, not to fake a render.
