Add @chenglou/pretext dependency and fitTextFontSize() utility that uses
canvas measureText to compute the largest font size that fits text within
a given width. Replaces character-count heuristics with actual font-aware
measurement.
- New fitTextFontSize() in @hyperframes/core/text, exposed on window.__hyperframes
- Generalized for all text elements (captions, titles, etc.), not just captions
- Unit tests (mocked pretext) + browser integration test (real Chromium canvas)
- Updated captions skill docs with usage, exit guarantee, and self-lint patterns
Co-authored-by: James <james.russo@heygen.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
## Summary
- **Lint rules** catch media elements missing `id` (renderer silently skips them), missing `src`, `preload="none"` (blocks renderer), and video nested in timed divs (freezes playback). Upgraded `video_nested_in_timed_element` from warning to error.
- **Compiler** strips `preload="none"` from media during compilation. Runs parallel, cached keyframe interval analysis via ffprobe — warns on sparse keyframes (>2s) that cause seek failures and audio/video desync. Suggested ffmpeg command preserves audio (`-c:a copy`).
- **Pre-render lint** lints `index.html` + all `compositions/*.html` sub-compositions before render via shared `lintProject()` helper. Warns by default; `--strict` blocks on errors, `--strict-all` blocks on errors + warnings.
- **Render orchestrator** logs a hint to retry with `--workers 1` when parallel capture times out on video-heavy compositions.
- **Refactor**: extracted `runFfprobe()` + `parseProbeJson()` helpers to deduplicate ~80 lines of spawn boilerplate across 3 ffprobe functions. Extracted `shouldBlockRender()` so strict flag tests exercise production code. Shared `lintProject()` used by both `lint` and `render` commands.
## Context
Discovered during a real composition build session where:
1. `<audio>` without `id` rendered silently (preview worked fine because runtime queries `[data-start]`, but renderer queries `[id][src]`)
2. `<video>` inside timed `<div>` froze on first frame
3. `preload="none"` caused 45s renderer timeout
4. YouTube clips with sparse keyframes from `yt-dlp --download-sections` caused audio/video desync
5. Parallel workers timed out on video-heavy compositions
## Test plan
- [x] Core: 365/365 tests passing (5 new lint tests)
- [x] Engine: 24/24 tests passing
- [x] CLI: 14/14 tests passing (7 lintProject + 7 shouldBlockRender)
- [x] Lint + format hooks pass
- [ ] Manual: create a composition with `<audio data-start="0" src="test.wav">` (no id) — verify `npx hyperframes lint` catches it
- [ ] Manual: run `npx hyperframes render --strict` with lint errors — verify it blocks
- [ ] Manual: run `npx hyperframes render --strict-all` with lint warnings — verify it blocks
npm's sigstore provenance verification requires package.json
repository.url to match the GitHub repo. Without it, publish
fails with E422 "expected to match https://github.com/heygen-com/hyperframes".
- Use static import for copyFileSync (was unnecessary dynamic import)
- Shallow-copy config before mutating forceScreenshot (prevents
caller-provided config from being permanently modified)
- Consolidate isWebm/isWebmRender/outputFormat into single early
declaration in renderOrchestrator
- Fix debug output extension for WebM (was hardcoded .mp4)
- Log unexpected audio extraction errors instead of silently swallowing
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Force screenshot capture mode for WebM (beginFrame doesn't support
alpha channel in chrome-headless-shell)
- Set Emulation.setDefaultBackgroundColorOverride once during session
creation (matching experiment-framework's approach)
- Fix acquireBrowser to pass executable path in screenshot mode on
Linux (was setting undefined, causing puppeteer-core to fail)
- Add Page.captureScreenshot params: fromSurface, captureBeyondViewport,
optimizeForSpeed (matching experiment-framework)
- Fix regression harness extractMonoPcm16 for videos without audio
- Add getEncoderPreset unit tests
- Add webm-transparency regression test with golden baseline
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- New regression test `webm-transparency`: minimal transparent composition
rendered to WebM, validates VP9 codec and visual quality at 100
checkpoints against golden baseline
- Extend regression harness: `renderConfig.format` field ("mp4" | "webm"),
format-aware output paths and snapshot filenames
- Fix `extractMonoPcm16` to gracefully handle videos without audio
streams (WebM without audio was throwing instead of returning empty)
- Unit tests for `getEncoderPreset()`: VP9/yuva420p for WebM,
h264/yuv420p for MP4, preset mapping, quality preservation
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Support rendering compositions with transparent backgrounds via
`--format webm`. VP9+alpha is the standard format for overlayable
video (captions, lower thirds, overlays).
Changes by layer:
- CLI: `--format mp4|webm` flag on render command
- Producer: threads format through RenderConfig, switches to PNG
capture and VP9 encoding when webm
- Engine: getEncoderPreset() returns VP9 config with yuva420p;
transparent page background via CDP when capturing PNG;
mux uses Opus audio for WebM; VP9 flags from production:
-row-mt 1, -auto-alt-ref 0, alpha_mode=1 metadata
- Frame capture: Emulation.setDefaultBackgroundColorOverride a=0
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
## Release v0.1.3
Bumps all packages to v0.1.3.
### Changes since v0.1.2
- fix(producer): resolve manifest from sibling dist/ directory
- fix(producer): add margin reset when wrapping HTML fragments
- fix(producer): exclude test files from tsc build
- feat(cli): add opt-out anonymous telemetry via PostHog
- feat: add HyperFrames skills for AI coding tools
- fix(cli): resolve npx hyperframes from inside monorepo
- fix(ci): publish workflow fixes (remove provenance, idempotent steps, remove prepublishOnly)
After merging, the release tag is created automatically, which triggers npm publish.
- Add READMEs for all 5 packages (core, engine, producer, cli, studio)
with install, overview, basic usage, and links to full docs
- Rewrite core README from internal doc to OSS-facing format
- Polish root README: add badges, packages table, docs link, requirements
- Add AI usage policy and BDFL governance statement to CONTRIBUTING.md
- Genericize license references (pending final license decision)
- Docs URL set to hyperframes.heygen.com
Addresses VA-850.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
pnpm converts workspace:^ to ^X.Y.Z during publish, but workspace:*
was left unconverted in the registry. This caused install failures
for external consumers.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* feat: initial code port from hyperframes-internal
Port all OSS-ready packages from the internal monorepo:
- @hyperframes/core — shared types, HTML generation, GSAP utilities, runtime
- @hyperframes/cli — CLI for creating, previewing, and rendering compositions
- @hyperframes/engine — framework-agnostic rendering engine (BeginFrame + FFmpeg)
- @hyperframes/producer — video rendering pipeline (Puppeteer + FFmpeg)
- @hyperframes/ui-player — browser-based video player component
- @hyperframes/studio — composition editor (React frontend + Hono backend)
Includes regression test suite with Docker-based test harness.
All HeyGen-internal references, deployment infrastructure, and
proprietary assets have been removed. Package names migrated
from @app/* to @hyperframes/*.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix: scrub internal codenames and stale references from OSS port
- Replace static.heygen.ai runtime URLs in test fixtures
- Remove internal CDN publish script (publish-hyperframe-runtime.ts)
- Replace sandbox-studio, sandbox-interceptor, __magicEditRuntime
with neutral names (studio, hyperframe-runtime, __hyperframeRuntime)
- Fix stale Vault API / localhost references in docs
- Remove broken deprecated_studio link
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix: remove remaining internal codenames and stale references
- Delete stale producer README.md and PIPELINE.md (referenced nonexistent files)
- Replace "Cerberus" codename with "HyperFrames" in test design reviews
- Replace magic-edit postMessage identifiers with hf-preview/hf-parent
- Rename debug-magic-edit-timeline.ts to debug-timeline.ts
- Replace "Motion Cut" with "HyperFrames" in Timeline comments
- Fix studio/CLI references to nonexistent archive package
(use local data/projects/ dir, stub render proxy)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
James