Rendered offline, one exact frame at a time, so the video is perfectly smooth even if this computer is slow. The file is WebM, which YouTube takes directly.
Edits here go back into the film script. Want music? Add a track from the YouTube Audio Library in YouTube Studio, under Editor.
Every film here is a film script: a JSON document that says where the scene is, who's in it, where everyone moves and what they do, and where the camera goes. Claude is good at writing these.