Tag: bridge

Python-to-JavaScript Bridge for After Effects: How It Works The After Effects Automation toolkit lets you control After Effects from Python. But After Effects doesn't speak Python natively — it speaks ExtendScript, a JavaScript dialect. So how does the bridge work? In this post, I'll explain the architecture. The problem After Effects exposes two main automation paths: ExtendScript (.jsx files): You can run scripts inside After Effects to manipulate comps, layers, and renders. But ExtendScript is old, limited, and not fun to write at scale. COM on Windows / AppleScript on macOS: These let external apps send commands to After Effects, but they're platform-specific and verbose. What developers actually want is a clean Python API: project.comp("Main").layer("Title").text = "Hello World" So the toolkit builds a bridge: Python on one side, ExtendScript/COM on the other. The architecture ┌────────────────┐ │ Python API │ │ (your script) │ └───────┬────────┘ │ method calls ┌───────┴────────┐ │ Bridge...