miga-heygenandMiguel Ángel
82f49262ec
The motion-blur snippet integrated translation only. Its output stage was one SVG filter per target whose copies were feOffset, and feOffset only translates, so a beat that only scaled or only turned sampled a displacement of zero and rendered sharp. No SVG filter primitive can give a copy its own affine transform, so the sampling loop was never the problem: the output stage was. Copies are now DOM clones of the element in an isolation:isolate group, each at 1/N opacity with mix-blend-mode plus-lighter, each carrying the element's resolved transform at its sample time. plus-lighter adds premultiplied colour, so N + 1 copies at 1/N sum to the average the shutter integral asks for; the isolation is load-bearing rather than tidy, because without a transparent backdrop of its own the first copy adds onto the page and blows a light background out to white. Reading the resolved matrix instead of a list of named GSAP properties is what makes every driver work at once: translation, scale, rotation, 3D rotation and skew arrive in the same one value. Measured against the After Effects export the shutter model was fitted to, per beat, previous stage to this one: scale +0.62 dB, rotate X +0.43, rotate Y +0.84, rotate Z +1.15, translate X -0.18, translate Y -0.04. The two small translate regressions are inherent and not tunable: the filter offset one rasterisation so every copy was pixel-identical, where each copy is now rasterised independently at its own fractional transform with its own subpixel antialiasing. Three consequences of the new stage, each carrying its own fix: - mix-blend-mode flattens preserve-3d, so a copy cannot inherit the parent's 3D context. Each copy carries the parent's perspective as its own first transform function instead. - A copy is styled by nothing that selected the original, since dropping the id also drops every #id rule that gave it size, colour and font. Each copy carries its own resolved style inline, read once and replayed. Those values are px, so a container-relative element needs them again when its box changes: a ResizeObserver re-snapshots rather than paying a subtree walk every frame. - A beat that moved and faded at once kept a full-strength smear behind a vanishing element. The element's opacity now rides the group; the 1/N weight stays on the copies. The axis option is gone. It selected which of x and y to sample, a question the resolved matrix does not have. shutter-slam is the new component: one word through six single-property beats, two translate slams, a scale punch, then a full turn about each axis, which exercises every driver the model covers in one mount. Easing is power2.inOut because it measured best, not because it was the default. A bezier fitted to the reference's own bbox centres looks like the better curve and renders worse: a blurred bbox centre is the shutter window's average rather than the instant, so on an accelerating segment the fit measures its own blur. Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>
hyperframes
CLI for creating, previewing, and rendering HTML video compositions.
Install
npm install -g hyperframes
Or use directly with npx:
npx hyperframes <command>
Requirements: Node.js >= 22, FFmpeg
Commands
init
Scaffold a new Hyperframes project from a template:
npx hyperframes init my-video
cd my-video
preview
Start the live preview studio in your browser:
npx hyperframes preview
# Studio: http://localhost:3002/#project/my-video
# Server: http://localhost:3002
npx hyperframes preview --port 4567
In an interactive terminal, the preview stays attached until you press
Ctrl+C. In a non-interactive shell such as a coding-agent session, the same
command starts a managed preview that survives after the command returns. Use
--background or --foreground to choose explicitly, and manage persistent
previews with --status, --stop, --list, and --kill-all. Add --json to
managed lifecycle commands for machine-readable output. --foreground --json
prints the ready-session envelope once, then remains attached until stopped.
normalize-audio
Measure two local authored audio clips with integrated LUFS and match the target
to the unchanged reference. The command is a dry run unless --write is passed:
npx hyperframes normalize-audio --reference target-audio --target user-audio
npx hyperframes normalize-audio --reference target-audio --target user-audio --write
It updates only the target element's data-volume and refuses unsafe boosts
that exceed Studio's +12 dB ceiling or would clip.
render
Render a composition to MP4. Run from the project directory; the positional
argument is the project directory (not a file), so render the project's
index.html directly, or point at a specific composition file with -c:
npx hyperframes render -o output.mp4
npx hyperframes render -c ./my-composition.html -o output.mp4
Set HYPERFRAMES_RENDER_DETACHED=1 when starting a render with nohup or
disown so it keeps running after the invoking shell exits.
publish
Upload a project directory and get a hosted URL that keeps working after the CLI exits. Published projects are private by default:
npx hyperframes publish
npx hyperframes publish ./my-video
npx hyperframes publish --public
npx hyperframes publish --yes
Signed-out publishing returns an authentication-required claim URL; opening it
lets someone sign in and claim the project. Sign in first with
npx hyperframes auth login to publish an owned project you can update. Use
--public to make the claimed project visible to anyone. --yes only skips the
confirmation prompt and does not change visibility.
Signed-in publishers can use --update <url-or-id> to target an existing project
or --space <space-id> to publish into a shared team space. If the requested
project is missing or inaccessible, publishing can create a new project instead;
check the printed URL and status.
See the publish reference for all options, including video proxy settings.
lint
Validate your Hyperframes HTML:
npx hyperframes lint ./my-composition
npx hyperframes lint ./my-composition --json # JSON output for CI/tooling
npx hyperframes lint ./my-composition --verbose # Include info-level findings
By default only errors and warnings are shown. Use --verbose to also display informational findings (e.g., external script dependency notices). Use --json for machine-readable output with errorCount, warningCount, infoCount, and a findings array.
compositions
List compositions found in the current project:
npx hyperframes compositions
benchmark
Run rendering benchmarks:
npx hyperframes benchmark ./my-composition.html
doctor
Check your environment for required dependencies (Chrome, FFmpeg, Node.js):
npx hyperframes doctor
browser
Manage the bundled Chrome/Chromium installation:
npx hyperframes browser
info
Print version and environment info:
npx hyperframes info
docs
Open the documentation in your browser:
npx hyperframes docs
upgrade
Check for updates and show upgrade instructions:
npx hyperframes upgrade
npx hyperframes upgrade --check --json # machine-readable for agents
Documentation
Full documentation: hyperframes.heygen.com/packages/cli
Related packages
@hyperframes/core— types, parsers, frame adapters@hyperframes/engine— rendering engine@hyperframes/producer— render pipeline@hyperframes/studio— composition editor UI