ExtendScript Coverage¶

Implementation progress of the ExtendScript API in py_aep.

Each row lists the attributes and methods from the After Effects Scripting Guide that are not yet implemented.

• ✅ = all attributes and methods implemented
• 🚧 = partially implemented
• ❌ = class does not exist in py_aep

Two kinds of members are excluded from the tables and do not count against a class's status:

• Runtime members reflect the state of a running After Effects instance (UI panels, rendering, dialogs, the font server, watch folders, Team Projects). They are not stored in .aep files and are out of scope for a file parser; each section's note lists them.
• Intentionally different APIs: members py_aep exposes through a more Pythonic surface - keyframe key*() methods > Property.keyframes, collection classes (ItemCollection, LayerCollection, OMCollection, RQItemCollection) > plain lists plus add_*() methods on the owning model, toString() > str(). See Differences from ExtendScript.

General¶

Note: All System members and the remaining Application members are runtime state: availableGPUAccelTypes, disableRendering, exitAfterLaunchAndEval, exitCode, fonts, isoLanguage, isRenderEngine, isWatchFolder, memoryInUse, onError, saveProjectOnCrash, settings, and every Application method (undo groups, dialogs, watch folders, tasks, memory limits). app.open() and app.newProject() correspond to py_aep.parse() and py_aep.new(). The installed-effect names are available as Project.effect_names; app.effects's per-effect category and version are not parsed.

Note: Project runtime members: dirty, selection, toolType, close(), saveWithDialog(), importFileWithDialog(), showWindow(), setDefaultImportFolder(), and the Team Projects methods. itemByID(id) is project.items[id] (a dict keyed by item id); item(index) indexes the same collection.

Items¶

Note: Item.setGuide() is covered by the writable Guide objects on Item.guides. CompItem.getMotionGraphicsTemplateControllerName() / setMotionGraphicsControllerName() are covered by the read/write EssentialGraphicsController.name. Runtime members: CompItem.counters (an undocumented app-wide no-op), openInViewer(), openInEssentialGraphics().

Layers¶

Note: sourceRectAtTime() returns the source bounds for footage, solid, precomposition and adjustment layers; the text-layer ink bounding box (glyph extents) and shape-layer geometry bounds raise NotImplementedError (see Differences). Layer.doSceneEditDetection() (which runs Adobe Sensei's AI scene-cut detection on the rendered media) and openInViewer() are runtime.

Properties¶

Note: The keyframe accessors (keyTime(), keyValue(), keyInTemporalEase(), ...) and mutators (setValueAtKey(), setTemporalEaseAtKey(), ...) are covered by the Keyframe objects on Property.keyframes and the 0-based mutation methods; setValue() is the value setter, setPropertyParameters() the property_parameters setter and setAlternateSource() the alternate_source setter (see Differences). PropertyBase.propertyGroup(countUp) is covered by walking parent_property. Key selection (selectedKeys, keySelected(), setSelectedAtKey()) is not parsed.

Render Queue¶

Note: setSetting() and setSettings() are covered by the writable settings mapping on both classes: item.settings[key] = value sets one setting and item.settings = {...} applies a whole dict (a round-tripped dict(item.settings) re-applies cleanly; read-only keys such as "Format" are left untouched). Runtime members: RenderQueue.canQueueInAME, rendering, render(), pauseRendering(), queueNotify, stopRendering(), queueInAME(), showWindow(), and RenderQueueItem.onStatusChanged. RenderQueue.item(index) and RenderQueueItem.outputModule(index) are the items and output_modules lists. saveAsTemplate() writes to the AE preference files, which py_aep treats as read-only.

Sources¶

Note: FootageSource.guessAlphaMode() and guessPulldown() analyze the media file at runtime; py_aep deliberately does not estimate alpha or pulldown on import.

Other¶

Note: Shape's parallel feather arrays are covered by the FeatherPoint objects on Shape.feather_points, and MarkerValue.getParameters() / setParameters() by the params attribute (see Differences).

Note: The AE preference .txt files are read-only in py_aep: set_pref_as_* writes an in-memory override layer, so saveToDisk() is deliberately not provided. getPrefAsLong / getPrefAsFloat merge into get_pref_as_number(), and savePrefAs* are the set_pref_as_* methods. Settings is the runtime settings store (not part of .aep); Viewer.maximized and setActive() are runtime panel state.

Text¶

Note: The .aep file stores only a font's PostScript name, version, and design vector; the missing FontObject members describe the installed font and would require system font-database resolution. The remaining FontObject members are runtime font-server state (fontID, isFromAdobeFonts, isSubstitute, location, otherFontsWithSameDict, hasGlyphsFor(), hasSameDict()), as is the whole FontsObject collection. TextDocument.fontFamily / fontStyle / fontLocation likewise resolve from the installed font (py_aep exposes the stored font and font_object instead).