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, and the content bounds of shape and text layers, raising NotImplementedError outside the measured envelope (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).