HyperFrames CLI

Everything runs through npx hyperframes (or the globally-installed hyperframes after npm install -g hyperframes). Requires Node.js >= 22 and FFmpeg.

Workflow

Scaffold — npx hyperframes init my-video (or npx hyperframes capture <url> if starting from a website)
Write — author HTML composition (see composition.md)
Lint — npx hyperframes lint
Validate — npx hyperframes validate (WCAG contrast audit)
Inspect — npx hyperframes inspect (visual layout audit)
Preview — npx hyperframes preview
Render — npx hyperframes render

Always lint before preview/render — catches missing data-composition-id, overlapping tracks, and unregistered timelines.

init — Scaffold a Project

bash

npx hyperframes init my-video                        # interactive wizard
npx hyperframes init my-video --example warm-grain   # pick an example template
npx hyperframes init my-video --video clip.mp4       # seed with a video file
npx hyperframes init my-video --audio track.mp3      # seed with an audio file
npx hyperframes init my-video --non-interactive      # skip prompts (CI / agent use)

Templates: blank, warm-grain, play-mode, swiss-grid, vignelli, decision-tree, kinetic-type, product-promo, nyt-graph.

init creates the correct file structure, copies media, transcribes audio with Whisper, and installs authoring skills. Use it instead of creating files by hand.

capture — Website → Editable Components

bash

npx hyperframes capture https://example.com                  # → captures/example.com/
npx hyperframes capture https://stripe.com -o stripe-video   # custom output dir
npx hyperframes capture https://example.com --json           # machine-readable output
npx hyperframes capture https://example.com --skip-assets    # skip images/SVGs

Captures the site into captures/<hostname>/capture/ by default, producing capture/screenshots/, capture/assets/, capture/extracted/ (tokens.json, visible-text.txt, fonts.json), and a self-contained snapshot.

All downstream steps (DESIGN.md, SCRIPT.md, STORYBOARD, composition) read from the capture/ subfolder — see website-to-video.md.

lint

bash

npx hyperframes lint                # current directory
npx hyperframes lint ./my-project   # specific project
npx hyperframes lint --verbose      # include info-level findings
npx hyperframes lint --json         # machine-readable output

Lints index.html and all files in compositions/. Reports errors (must fix), warnings (should fix), and info (only with --verbose).

validate

bash

npx hyperframes validate                 # WCAG contrast audit at 5 timestamps
npx hyperframes validate --no-contrast   # skip while iterating

Seeks to 5 timestamps, screenshots the page, samples background pixels behind every text element, and warns on contrast ratios below 4.5:1 (normal text) or 3:1 (large text — 24px+, or 19px+ bold). Run before final render.

inspect

bash

npx hyperframes inspect                 # visual layout audit at 5 timestamps
npx hyperframes inspect ./my-project    # specific project
npx hyperframes inspect --json          # agent-readable findings
npx hyperframes inspect --samples 15    # denser timeline sweep
npx hyperframes inspect --at 1.5,4,7.25 # explicit hero-frame timestamps

Use this after lint and validate, especially for compositions with speech bubbles, cards, captions, or tight typography. Reports overflow, off-frame elements, occluded text, contrast warnings, and per-timestamp layout summaries — catches issues that pure timeline lint can't see (e.g., a caption that wraps past the safe area only at a specific timestamp).

npx hyperframes layout is a compatibility alias for the same visual inspection pass.

preview

bash

npx hyperframes preview                # serve current directory (port 3002)
npx hyperframes preview --port 4567    # custom port

Hot-reloads on file changes. Opens the Studio in your browser automatically.

render

bash

npx hyperframes render                              # standard MP4
npx hyperframes render --output final.mp4           # named output
npx hyperframes render --quality draft              # fast iteration
npx hyperframes render --fps 60 --quality high      # final delivery
npx hyperframes render --format webm                # transparent WebM
npx hyperframes render --docker                     # byte-identical reproducible render

Flag	Options	Default	Notes
`--output`	path	`renders/<name>_<timestamp>.mp4`	Output path
`--fps`	24, 30, 60	30	60fps doubles render time
`--quality`	`draft`, `standard`, `high`	standard	draft for iterating
`--format`	`mp4`, `webm`	mp4	WebM supports transparency
`--workers`	1–8 or `auto`	auto	Each spawns Chrome
`--docker`	flag	off	Reproducible output
`--gpu`	flag	off	GPU-accelerated encoding
`--strict`	flag	off	Fail on lint errors
`--strict-all`	flag	off	Fail on errors AND warnings

Quality guidance: draft while iterating, standard for review, high for final delivery.

transcribe

bash

npx hyperframes transcribe audio.mp3
npx hyperframes transcribe video.mp4 --model medium.en --language en
npx hyperframes transcribe subtitles.srt     # import existing
npx hyperframes transcribe subtitles.vtt
npx hyperframes transcribe openai-response.json

Produces word-level timings suitable for caption components. First run downloads the Whisper model (cached after).

tts

bash

npx hyperframes tts "Text here" --voice af_nova --output narration.wav
npx hyperframes tts script.txt --voice bf_emma
npx hyperframes tts "La reunión empieza a las nueve" --voice ef_dora --output es.wav
npx hyperframes tts "Hello there" --voice af_heart --lang fr-fr --output accented.wav
npx hyperframes tts --list                    # show all voices

Uses Kokoro (local, no API key). Voice ID first letter encodes language: a American English, b British English, e Spanish, f French, h Hindi, i Italian, j Japanese, p Brazilian Portuguese, z Mandarin. The CLI auto-infers the phonemizer locale from that prefix — pass --lang only to override (e.g. stylized accents). Valid --lang codes: en-us, en-gb, es, fr-fr, hi, it, pt-br, ja, zh. Non-English phonemization requires espeak-ng installed system-wide (apt-get install espeak-ng / brew install espeak-ng).

doctor

bash

npx hyperframes doctor

Verifies environment:

Node.js >= 22
FFmpeg present on PATH
Available RAM (renders are memory-hungry — 4 GB minimum)
Chrome binary resolution (chrome-headless-shell preferred over system Chrome)
Current hyperframes version

Run this first when a render fails. See troubleshooting.md for interpreting the output.

browser

bash

npx hyperframes browser --install      # install the bundled chrome-headless-shell
npx hyperframes browser --path         # print the resolved browser binary path
npx hyperframes browser --clean        # clear the bundled browser cache

info

bash

npx hyperframes info

Prints version, Node version, FFmpeg version, OS, and resolved browser path — useful in bug reports.

upgrade

bash

npx hyperframes upgrade -y

Check for and install updates. Run this if you hit HeadlessExperimental.beginFrame errors — the auto-detect fix shipped in [email protected] (commit 4c72ba4, March 2026).

Other

bash

npx hyperframes compositions    # list compositions in the project
npx hyperframes docs            # open documentation in browser
npx hyperframes benchmark .     # benchmark render performance
npx hyperframes add <block>     # install a block/component from the catalog
npx hyperframes add --list      # browse the catalog

Popular catalog blocks: flash-through-white (shader transition), instagram-follow (social overlay), data-chart (animated chart), lower-third (talking-head overlay). See hyperframes.heygen.com/catalog.