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feat(format): add Auto, the default format that fits the composition - #777
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The v2 migration leaves asset.video empty and only the camera's dimensions were backfilled, so the scene laid every recording out as 1920x1080 while the export was sized off the probe. Write the probed size into the document, which every reader already takes it from.
Auto sizes the output frame from what it shows instead of the other way round: the reference clip's cropped screen, the camera layout at rest (a square camera beside or under the screen), and an even padding border. Its elongation is fit * e + (1 - fit), so 0% padding hugs the composition and more padding pulls it toward square. resolveAspectRatioValue stays the single resolver for the preview, the native scene, the export dialog, captions and the CLI. The padding box moves into compositeLayout (paddedContentSize) so the preview and the scene stop carrying their own copy, and fixed formats render as before. The Format menu lists Auto first, with the size it resolves to.
A project that never chose a ratio stores none and reads the default, so flipping the default alone would reshape every such project on its next open. Schema v8 pins the frame they have always shown, 16:9, on documents that miss a ratio; documents created from v8 on read Auto. The legacy v2 format keeps reading a missing ratio as 16:9, since every v2 file predates Auto; `openscreen record --project` states Auto for the new projects it writes.
The Format row now lists Auto as the default, in English and the seven translated locales.
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📝 WalkthroughWalkthroughThe project adds Auto as the default aspect ratio for new projects. It calculates frame geometry from a reference clip, camera layout, and padding, and applies that geometry to preview and export. The document schema advances to version 8, with a migration that preserves the previous 16:9 default for older documents. ChangesAutomatic aspect ratio
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant VideoEffectsPane
participant resolveAspectRatioValue
participant referenceClip
participant autoAspectRatioValue
participant compositeLayout
VideoEffectsPane->>resolveAspectRatioValue: Resolve Auto for the current document
resolveAspectRatioValue->>autoAspectRatioValue: Calculate the document-specific frame aspect
autoAspectRatioValue->>referenceClip: Select reference clip and effective dimensions
referenceClip-->>autoAspectRatioValue: Return clip and dimensions
autoAspectRatioValue->>compositeLayout: Apply camera layout and padding
compositeLayout-->>autoAspectRatioValue: Return composition aspect
autoAspectRatioValue-->>resolveAspectRatioValue: Return resolved aspect ratio
resolveAspectRatioValue-->>VideoEffectsPane: Provide resolved output dimensions
Merge Risk: 🔵 Low · up to Auto works differently for newly created and migrated projects, and its frame shape also depends on cropping, camera layout, and padding. Clarify the translated guidance; these documentation issues do not prevent merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Existing projects are designed to keep their previous format, while new projects use Auto. A reverse-conversion path can lose that new choice. No new security boundary crossing was established in the inspected paths, but downstream export behavior was not fully verified. Retained concerns
Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 54.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 35 functions across 30 files. (42 skipped: 42 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@website/i18n/es/docusaurus-plugin-content-docs/current/editing-timeline.md`:
- Line 33: Update the **Formato** description in the Composición row to state
that Auto is the default for new projects only, and clarify that existing
projects without a stored ratio retain 16:9.
In `@website/i18n/fr/docusaurus-plugin-content-docs/current/editing-timeline.md`:
- Line 33: Update the Format descriptions to qualify Auto as the default for new
projects, not all projects. Apply this wording change in
website/i18n/fr/docusaurus-plugin-content-docs/current/editing-timeline.md at
line 33,
website/i18n/es/docusaurus-plugin-content-docs/current/guides/product-demo-video.md
at line 105, and
website/i18n/fr/docusaurus-plugin-content-docs/current/guides/product-demo-video.md
at line 105.
In `@website/i18n/pt-BR/docusaurus-plugin-content-docs/current/media-library.md`:
- Line 45: Atualize a descrição de **Auto** no controle **Formato** para
esclarecer que o quadro se baseia no maior clipe efetivo da linha do tempo,
considerando o recorte de imagem, o layout de câmera em repouso e o espaçamento
uniforme do projeto, não apenas no maior clipe de origem.
In `@website/i18n/zh-CN/docusaurus-plugin-content-docs/current/media-library.md`:
- Line 45: Update the **格式** control description in the media-library
documentation to clarify that Auto calculates the canvas dimensions using the
largest valid post-crop clip, its camera layout, and the project’s padding. Keep
the existing explanation of Original and the clip-fitting behavior intact.
In `@website/i18n/zh-TW/docusaurus-plugin-content-docs/current/media-library.md`:
- Line 45: Update the **畫面合成** panel’s **自動** description to explain that the
frame shape is determined using the largest effective cropped clip as the
reference together with the camera layout and padding; keep the existing
descriptions of **原始** and clip fitting unchanged.
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📒 Files selected for processing (72)
electron/ai-edition/document-service.test.tssrc/cli/CliExportRunner.tsxsrc/cli/CliRecordRunner.tsxsrc/components/ai-edition/CaptionsPane.gating.test.tsxsrc/components/ai-edition/CaptionsPane.placement.test.tsxsrc/components/ai-edition/EditorEmptyState.test.tsxsrc/components/ai-edition/PreviewCanvas.tsxsrc/components/ai-edition/RightPanes.tsxsrc/components/ai-edition/TranscriptPane.lanes.test.tsxsrc/components/video-editor/editorDefaults.tssrc/components/video-editor/projectPersistence.tssrc/i18n/locales/ar/settings.jsonsrc/i18n/locales/cs/settings.jsonsrc/i18n/locales/de/settings.jsonsrc/i18n/locales/en/settings.jsonsrc/i18n/locales/es/settings.jsonsrc/i18n/locales/fr/settings.jsonsrc/i18n/locales/it/settings.jsonsrc/i18n/locales/ja-JP/settings.jsonsrc/i18n/locales/ko-KR/settings.jsonsrc/i18n/locales/pt-BR/settings.jsonsrc/i18n/locales/ru/settings.jsonsrc/i18n/locales/tr/settings.jsonsrc/i18n/locales/vi/settings.jsonsrc/i18n/locales/zh-CN/settings.jsonsrc/i18n/locales/zh-TW/settings.jsonsrc/lib/ai-edition/captions/captionLane.test.tssrc/lib/ai-edition/document/audioLanes.test.tssrc/lib/ai-edition/document/migrate.test.tssrc/lib/ai-edition/document/outputFormat.test.tssrc/lib/ai-edition/document/outputFormat.tssrc/lib/ai-edition/schema/index.test.tssrc/lib/ai-edition/schema/index.tssrc/lib/ai-edition/store/editorSettings.test.tssrc/lib/ai-edition/store/projectStore.test.tssrc/lib/ai-edition/store/transcriptionStore.test.tssrc/lib/ai-edition/stylePresets.tssrc/lib/ai-edition/transcription/status.test.tssrc/lib/compositeLayout.test.tssrc/lib/compositeLayout.tssrc/lib/projectDefaults.tssrc/native/sceneDescription.test.tssrc/native/sceneDescription.tssrc/utils/aspectRatioUtils.test.tssrc/utils/aspectRatioUtils.tstechnical-documentation/architecture/document-model.mdtechnical-documentation/architecture/export-pipeline.mdtechnical-documentation/testing/manual-e2e-checklist.mdwebsite/docs/editing-timeline.mdwebsite/docs/guides/product-demo-video.mdwebsite/docs/media-library.mdwebsite/i18n/de/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/de/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/de/docusaurus-plugin-content-docs/current/media-library.mdwebsite/i18n/es/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/es/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/es/docusaurus-plugin-content-docs/current/media-library.mdwebsite/i18n/fr/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/fr/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/fr/docusaurus-plugin-content-docs/current/media-library.mdwebsite/i18n/ja/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/ja/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/ja/docusaurus-plugin-content-docs/current/media-library.mdwebsite/i18n/pt-BR/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/pt-BR/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/pt-BR/docusaurus-plugin-content-docs/current/media-library.mdwebsite/i18n/zh-CN/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/zh-CN/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/zh-CN/docusaurus-plugin-content-docs/current/media-library.mdwebsite/i18n/zh-TW/docusaurus-plugin-content-docs/current/editing-timeline.mdwebsite/i18n/zh-TW/docusaurus-plugin-content-docs/current/guides/product-demo-video.mdwebsite/i18n/zh-TW/docusaurus-plugin-content-docs/current/media-library.md
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Existing projects that never chose a ratio keep 16:9, so "the default" now says it applies to new projects. The media library line also names the camera layout and the padding, which shape the Auto frame along with the largest clip. English and the seven translations.
This was referenced Sep 25, 2026
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Summary
Auto joins the Format menu and becomes the default for new projects. The frame takes the shape of what it shows:
Frame elongation is
fit × e + (1 − fit), withfit = 1 − 0.4 × padding. Zoom, device frames, shadow, captions and Full Camera happen inside the frame and never change it. The Auto row shows the size it resolves to.Single source of truth
resolveAspectRatioValuestays the only resolver, for the preview, the native scene, the export dialog, captions and the CLI.compositeLayout.ts(paddedContentSize). The preview and the scene each carried their own copy.Default and migration
openscreen record --projectwrites Auto.Also fixed: the CLI export laid every recording out as 1920×1080 while sizing the file from the probe. It now writes the probed size into the document.
Screen Studio, for reference. Measured on five public exports: their Auto is the recording plus one padding value in pixels on all sides. They have no side-by-side or stacked camera layout, so this goes further there. Cap keeps the crop's ratio with proportional margins.
Related issue
None.
Type of change
Release impact
Desktop impact
Screenshots / video
Measured on exported frames, see Testing.
Testing
npm run test: 260 files, 3255 passed. New cases cover Auto geometry (7 compositions × 4 paddings, even border within 1.5 px, square camera), resolution, the native scene and the v7 → v8 upgrader.tsc --noEmitfor the app and the tests,npm run lint,npm run i18n:check.electron . export), 1280×720 screen and 640×480 camera, padding 50, borders measured on the frames:🤖 Generated with Claude Code
Summary by CodeRabbit