JamesandClaude Opus 4.7
a707b6a882
- Extract applyMask helper from postprocess and add 5 unit tests pinning the contract this PR is selling: fg.alpha + bg.alpha === 255 per pixel, RGB triples byte-identical between fg and bg, and bg=null path leaves the bg buffer untouched. Without these, a future postprocess change (mask threshold, premultiplied alpha, gamma) could silently break the inverse-alpha relationship and the existing plumbing tests would all still pass. - Add stdin 'error' listener inside spawnFfmpeg. If either encoder dies mid-render, Node emits an unhandled error on the dead writable on the next .write() and crashes the CLI before waitForExit's reject path can surface the encoder's stderr tail. Doubled encoder count = doubled failure surface, so this is worth pinning down. - Tighten stdio param to a 3-tuple so an accidental 1-element array fails at type-check. - Sharpen backpressure comment: write→true means "highWaterMark not exceeded," not "libuv flushed." Reuse-without-corruption is safe only because session.process is slow enough that libuv drains in between. Addresses review on PR #637. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.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 running at http://localhost:3002
npx hyperframes preview --port 4567
render
Render a composition to MP4:
npx hyperframes render ./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