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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.

audio

Measure where sounds land: onsets, the moment each sound peaks, loudness and silence. Give files, or query the film's own clips in film time:

npx hyperframes audio sfx/whoosh.mp3
npx hyperframes audio --at 12 --json

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

A render stops when the process that started it exits. To keep one running after its launcher exits, set HYPERFRAMES_RENDER_DETACHED=1 and start it in its own process group, e.g. bash -c 'set -m; HYPERFRAMES_RENDER_DETACHED=1 npx hyperframes render -o out.mp4 < /dev/null > render.log 2>&1 &'.

Piped, non-quiet renders emit a single @hf-diagnostic JSON line when an audio failure reaches the CLI error handler. Version 1 has operation: "render" and at most 16 audioFailures: allowlisted stage, reason, owner, retryable, and optional subprocess exit code, signal, termination reason and OS code. It omits messages, stderr, source paths/URLs, element IDs and command arguments. Consumers must ignore unknown versions and fields. This is local CLI output; uploading it requires the caller's existing consent and privacy checks. Quiet mode (including batch JSON mode) emits no diagnostic line.

This covers audio preparation and mix failures, including the typed external interruption path. Probe failures retain their existing stage/reason but do not gain subprocess evidence here; browser/FX failures remain classified as internal. Desktop ingestion and live report delivery are separate changes.

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

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