Miguel Ángel
b3c43e2480
* feat(cli): add normalize-audio to match one clip's loudness to another Measures two authored `<audio>` clips with FFmpeg's integrated EBU R128 loudness and writes the target's matching `data-volume`, leaving the reference untouched. The measurement is bounded to the window the composition actually plays. `data-end` bounds a clip's timeline window just as `data-duration` does, and `-ss`/`-t` belong before `-i`: after it they bound the OUTPUT, and with `-f null` there is none, so ebur128 keeps integrating past the clip. On a fixture whose played window is -61.8 LUFS inside a file that measures -27.9 whole, either mistake reports a loudness the composition never plays and "corrects" an already-matched clip by tens of dB. Two EBU R128 passes run between reading the composition and writing it, each bounded only by a two-minute timeout, and the skill docs tell agents to keep Studio open meanwhile — so the attribute patch is re-applied to a fresh read and written through a temp file and a rename. Under `--json` the failures are documents too: an agent doing `JSON.parse(stdout)` on a bare error line throws. A pair needing more than the +12 dB ceiling has a source-file problem rather than a mixer one — mixer gain raises the noise floor with the signal — so the refusal names the remedy. * fix(cli): validate --tolerance before paying for the measurement Each EBU R128 pass is bounded at 120s and normalize-audio runs two, so parsing the argument afterwards made a typo'd --tolerance cost both of them before failing on something that was wrong from the start. Not pinned by a test: the ordering is internal to the command and neither it nor the parser is exported, so covering it would mean restructuring for a spy rather than asserting the behaviour. * docs(cli): restore the blank line between the preview and normalize-audio sections Lost when I resolved the rebase conflict against the background-preview docs by hand instead of letting the formatter near it. oxfmt --check failed on the one file, which fails Preflight — and because preview-parity needs Preflight it skipped, and the preview-regression gate fails closed on a skip, so a missing newline read as a preview defect. The quieter half: the same needs chain meant the required Test context was never created at that head. Not failing — absent, so there was no test signal at all on the PR.
3.6 KiB
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
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