Imessage Video Ad

imessage-video-ad

Use this skill when an ad concept calls for an authentic iMessage thread reveal: someone screenshots a product/result, sends it to a friend, the friend reacts and asks what app/service it is, and the conversation surfaces the brand + a CTA code.

Everything this skill needs is bundled in this folder — the iMessage HTML renderer (scripts/generate.js + scripts/templates/), both end-card templates, the Apple SFX (assets/sfx/), and the example thread/timeline. No external skill dependencies.

Setup (once)

npm install                       # Playwright
npx playwright install chromium   # browser binary
pip install -r requirements.txt   # FAL client (flat-lay background step only)
cp .env.example .env              # add FAL_KEY if generating the flat-lay bg

ffmpeg and ffprobe must be on your PATH. All scripts run in place and take a --project so one copy of the skill drives many ads.

Output format — FRAMED (Variant B) is the standard

Renders the framed look by default: a visible iPhone bezel + Dynamic Island + status bar, sitting on a flat-lay desk background (1080×1920). The old full-bleed (edge-to-edge chat) look is DEPRECATED — reachable only via --full-bleed for backward reproduction.

Framed requires a background at /assets/flat-lay-bg.jpg — generate it with scripts/gen_flat_lay_bg.py (State 3.5) or supply your own. Dark threads (theme: "dark") render dark natively in frame mode, so no manual theme injection is needed.

When to use

• Reaction/discovery ads where the punchline is the recipient's curiosity ("what app is that?", "wait this is real?")
• Promo-code reveals (FREEPACK / FIRSTPACK / WELCOME10) — the conversational delivery feels far less ad-like than a hard CTA card alone
• Any time the brief mentions "fake DM", "screenshot of a chat", "iMessage style", "Tyler/peer"

This skill is for a multi-bubble timeline animated to video. If the chat is just one static beat (a single screenshot), you don't need video — render the HTML once and screenshot it.

Inputs

1. brief (required) — what the ad is selling, the CTA code, the peer's name (e.g. "Tyler"), the screenshot subject
2. project — a working directory for this ad (holds threads/, timeline.json, assets/, audio/, outputs)
3. peer_persona — name + 2-letter monogram + avatar bg color (hex)
4. screenshot_asset — the image that gets sent in the first attachment bubble
5. bubbles — the conversation, authored into threads/full-thread.json
6. timeline — event schedule authored into timeline.json (composer drives, typing, pops, scrolls, SFX)
7. end_card — real brand logo SVG + offer line + code
8. music — a lofi/hip-hop loop at /audio/music-bed.mp3

The full-thread.json schema is the iMessage-mockup schema (see examples/full-thread.example.json), extended with theme: "dark", a conversation header, attachment bubbles, and inline [[link:CODE]] markers.

Critical knowledge — read before producing your first ad

These are mistakes that have already been made and fixed in production builds. Do not re-introduce them.

0. Use the real brand wordmark on the end card, never styled text

CSS approximations of brand wordmarks look amateur even when typeface and kerning are close. Get the official SVG (Wikimedia Commons, brandfetch.com/.com, brand press kit) into /assets/brand-logo.svg. The end card is generated with the goose-graphics skill by default (pass the logo via --ref); the bundled fallback template injects it via --logo. See the "End card — use Goose graphics by default" section and references/end-card-recipe.md.

1. Use the real Apple iMessage SFX, not generic notification sounds

The "iMessage feel" is 70% the SFX. Generic notification sounds break the illusion immediately. The Apple sounds are CC0 (from BigSoundBank) and pre-bundled, loudness-normalized to ~-9 LUFS / peak 0dB, at:

• assets/sfx/imessage-send.mp3 — Apple "Message Sent"
• assets/sfx/imessage-receive.mp3 — Apple "Note", trimmed to 1.4s with a 400ms fade-out

stitch.sh reads these automatically. Reuse them — don't re-download.

2. NEVER play SFX on the typing indicator

The typing-dots bubble appearing is a silent state change — iOS does not chime when someone starts typing. Only fire receive SFX when the actual text bubble lands (i.e. on typing-swap). In timeline.json, every typing-pop event must have sfx: null.

3. Record the entire chat as ONE continuous Playwright session

Do not record scene-by-scene and concat — every page reload causes a micro-flicker, and "scrolling" has to be faked by removing older bubbles (which looks janky). scripts/record-master.js implements the continuous pattern: render the full thread with every message data-pending (hidden), then a single embedded driver walks the timeline on requestAnimationFrame, unhiding + popping each event on schedule, with custom-eased auto-scroll. SFX cues are computed deterministically from the timeline (never via performance.now() inside the page — it races setContent's load event and drops cues).

4. Pop-pending must remove rows from layout, not just hide them

If pending only set opacity: 0, every bubble pre-allocates its height at frame 0, so the auto-scroll has nothing to scroll to and bubbles "pop into pre-allocated holes" instead of arriving. The bundled chat.css uses display: none via data-pending="1" so the conversation grows naturally:

.row[data-pending="1"], .delivered-caption[data-pending="1"] { display: none !important; }

5. End card stays static — no Ken-Burns, no zoom-pan

The brand slate must land hard. render-end-card.js ffmpeg's the PNG to a fixed-frame MP4 at the framed 1080×1920 (no zoompan). stitch.sh scales the end card to the chat's resolution and crossfades chat → end card with a 300ms xfade (longer feels mushy, shorter feels like a hard cut).

6. ffmpeg amix divides by N inputs by default

If you amix music + silent base + N SFX without normalize=0, every input is divided by the count and the audio sounds mysteriously quiet. The bundled stitch.sh uses amix=inputs=N:duration=first:dropout_transition=0:normalize=0 then volume=2.5,alimiter=limit=0.95. See references/audio-recipe.md.

7. Music bed: lofi/hip-hop, 60Hz highpass, ~-10dB

Keep the bed unobtrusive — volume=0.30 + highpass=f=60, fading out 1.5s before the end so the CTA reveal lands in (relative) silence. Supply your bed at /audio/music-bed.mp3 (any ~80–95bpm no-vocal loop).

8. Hook screenshot — render it locally, mimic the real app

Most iMessage hooks are screenshots of some other app (Strava, a cancellation email, a card-grade summary). Generating these via AI is overkill and unreliable. Write an HTML file that mimics the real app's UI and screenshot it with Playwright. Mimic the actual UI patterns (brand strip, real stats grid, "Public · 2h ago"), not just the vibe — abstract gradients read as AI slop. See examples/strava-card.example.html.

9. Pacing curve — not flat 700ms gaps

Real iMessage banter has rhythm: one-word reactions 250–450ms apart; sentence reveals 600–900ms; a ~600ms beat of silence before the final reaction so it lands. The timeline in examples/timeline.example.json is a good starting point — adjust event times rather than redesigning.

Concept catalog

Most iMessage ads fit one of these six angles. Strongest hooks: a specific number, a small act of self-trust, or a physically novel product mechanic.

| Angle | Hook (the attachment) | Reveal | |---|---|---| | Result-as-screenshot | a number that brags by itself — race time, app summary, dashboard, FTP score | "X mins a day. that's it." | | Setup flex | photo of your space — tiny apartment, race-kit corner, home gym in a closet | "this is the whole gym" | | Cancellation moment | confirmation receipt — gym cancellation email, subscription cancelled page | "$X → $Y, do the math" | | Feature-as-punchline | short clip of the feature in motion — rotating screen, transforming product | the mechanic is the brand | | Friend-asks-friend (inverse) | the peer initiates with the wow — "how are you doing this 😭" | you reply with the brand | | Receipt-as-hook | mundane financial document — credit-card statement, App Store receipt | small act of self-trust |

Pick the strongest angle for the brand voice before writing copy. Most "the script is fine but feels off" feedback comes from picking the wrong angle. Catching that here is 30 seconds; catching it after recording is 30 minutes.

End card — use Goose graphics by default

The end card is generated with the goose-graphics skill by default. It renders a far more polished, on-brand slate than a hand-coded template, and the published style catalog keeps the look current.

Default: --style pixel-haze --format tweet — a warm-gray card with a pixel-mosaic gradient band and a clean wordmark, which reads well for consumer/app brands. (The tweet canvas is square 1080×1080; endcard-to-mp4.sh centers it on the 9:16 frame, auto-padding with the card's own background colour so the seam is invisible.)

# 1. Generate the end card in the default style (or swap --style for any catalog
#    slug — browse https://skills.gooseworks.ai/styles / `npx gooseworks styles list`).
/goose-graphics --style pixel-haze --format tweet \
  --brief "End card for . Big wordmark, one offer line, the promo code . ≤3 lines, static, no busy background." \
  --ref /assets/brand-logo.svg
# 2. Convert the exported PNG to the static end-card MP4 the stitch expects
#    (works for the square tweet and for any 9:16 story-format card too).
bash scripts/endcard-to-mp4.sh  ./my-ad

Swap --style for any catalog slug whose mood fits the brand (Dark & Moody, Bold & Energetic, Organic & Warm, …). The end-card craft rules still apply — see references/end-card-recipe.md (real wordmark, ≤3 lines, static, no Ken-Burns).

Fallback — bundled HTML templates (use only when goose-graphics is unavailable): scripts/render-end-card.js renders one of two local templates and injects your real logo SVG.

| --variant | Template | When to pick | |---|---|---| | glow (default) | scripts/end-card.html (abstract glow + product) | Brand voice is playful or product-led. Hook is a thing. | | photo-bg | scripts/end-card-photo-bg.html (athlete/persona photo) | Brand voice is grounded or lifestyle-led. Hook is a person. Requires --hero. |

Workflow

State 0 — Brainstorm angles (skip only if direct port of a reference)

Generate 4–5 concept angles from the catalog. For each: one-line hook (what gets screenshotted), an 8–14 bubble script as a markdown table, why it works in one sentence. Show the menu; lock the angle before writing the full script.

State 1 — Capture the script + screenshot asset

Write (or transcribe from a reference) the verbatim text of every bubble, who sends each, where typing indicators belong, the composer-text snippets, and the exact CTA code. Render the hook screenshot locally (knowledge #8) into /assets/.

State 2 — Build threads/full-thread.json

Use examples/full-thread.example.json as the template. Key fields:

• theme: "dark" (mandatory for this format)
• header.style: "conversation" and header.unread: (the unread badge)
• First message is usually {type: "attachment", from: "me", src, title, subtitle} — the screenshot the chat is about
• Inline [[link:CODE]] markers where iOS would auto-detect a code/email/URL — they render with the link-detector underline

State 3 — Define timeline.json

Copy examples/timeline.example.json to /timeline.json and adapt it. The events array is the single source of truth for both the recording schedule and the SFX cue list. t is absolute seconds. Kinds: pop, typing-pop (always sfx: null), typing-swap (sfx: 'receive'), composer, composer-clear, scroll, noop. Full reference: references/timeline-schema.md.

State 3.5 — Generate the flat-lay background (framed default)

python3 scripts/gen_flat_lay_bg.py --project ./my-ad      # FAL gpt-image-1, ~$0.19

Drop a brand-specific prompt at /flat-lay-prompt.txt to override the default desk (keep the empty-center rule). Or supply your own /assets/flat-lay-bg.jpg and skip this step.

State 4 — Record + end card + stitch

# 1) Record the chat as ONE continuous video → clips/master-chat.mp4 + .sfx.json
node scripts/record-master.js --project ./my-ad

# 2) End card (static) → clips/scene-09-endcard.mp4
#    DEFAULT: render it with the goose-graphics skill, then convert the PNG:
#      /goose-graphics --style pixel-haze --format tweet --brief "..." --ref ./my-ad/assets/brand-logo.svg
#      bash scripts/endcard-to-mp4.sh  ./my-ad
#    FALLBACK (goose-graphics unavailable): the bundled HTML template:
#      node scripts/render-end-card.js --project ./my-ad --logo ./my-ad/assets/brand-logo.svg
#      (photo-bg variant: add  --variant photo-bg --hero ./my-ad/assets/hero.png)

# 3) Stitch chat + end card with crossfade + music + SFX → edits/master-final.mp4
bash scripts/stitch.sh ./my-ad

State 5 — Export variants

ffmpeg -y -i ./my-ad/edits/master-final.mp4 -vf "scale=1080:1920:flags=lanczos" \
  -c:v libx264 -pix_fmt yuv420p -c:a copy -movflags +faststart ./my-ad/meta-upload/master-9x16-1080.mp4
ffmpeg -y -i ./my-ad/edits/master-final.mp4 -vf "crop=720:720:0:280" \
  -c:v libx264 -pix_fmt yuv420p -c:a copy -movflags +faststart ./my-ad/meta-upload/master-1x1-720.mp4

State 6 — Review

Play the master against the brief. Re-time individual events by editing timeline.json and re-running step 4.1 — no other steps need re-running.

Quality checks

Before declaring the ad shippable:

• [ ] FRAMED: the iPhone bezel + Dynamic Island + status bar are visible, the chat sits inside the phone screen, the flat-lay desk shows around it (NOT full-bleed). Output is 1080×1920.
• [ ] Audio peaks at 0dB (ffmpeg -af volumedetect); mean roughly -10 to -12dB
• [ ] No SFX on any typing-pop — verify in clips/master-chat.sfx.json
• [ ] No micro-flicker — only ONE cut in the whole video: chat → end card (crossfade)
• [ ] All bubbles popped in script order; composer types and clears per composer event (no ghost text after a send)
• [ ] The CTA code is link-detector underlined in its bubble ([[link:CODE]] marker present)
• [ ] End card is static — no Ken-Burns drift
• [ ] Chat→end-card crossfade is 300ms; the last bubble gets ~600ms to breathe first

Failure modes — and the fix

| Symptom | Cause | Fix | |---|---|---| | Glitchy / micro-flicker between bubbles | Recorded scene-by-scene with reloads | Use the continuous record-master.js (one session, one timeline) | | SFX too quiet, audio weak | amix divided by N inputs | :normalize=0 on amix + volume=2.5,alimiter=limit=0.95 (already in stitch.sh) | | Bubbles pre-allocate space, conversation doesn't grow | Pending hid via opacity:0 not display:none | Use data-pending="1" → display:none (already in chat.css) | | End card drifts / feels like filler | Ken-Burns zoompan | Keep the end card a static still — endcard-to-mp4.sh / render-end-card.js use a fixed frame, no zoompan | | Typing dots flash for 1 frame and skip | typing-pop → typing-swap gap too short | Hold ~700–1000ms between them | | CTA code not underlined | Missing [[link:CODE]] marker | Wrap the code/email/URL in the marker in full-thread.json | | Receiver avatar clipped at viewport top | conv-header stack overflows when position: fixed | The full-bleed styleOverride pads the header to min-height: 110px and anchors .center from top: 14px. Don't shrink without re-testing. | | End-card logo looks like

…

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: gooseworks-ai
• Source: gooseworks-ai/goose-video
• License: MIT

Install and usage instructions live in the source repository linked above.