Remotion Render

Drive the render-and-iterate loop: turn a composition into an MP4, take natural-language feedback, make the smallest edit that satisfies it, and re-render. The costly failure mode is the opposite loop - rewriting whole scene files for a copy tweak, or re-rendering at full quality for every check - which destroys the approved work and the iteration speed that makes Remotion worth using.

Operating procedure

Step 1: Gather inputs

• Composition ID (the id on the <Composition> in src/Root.tsx, not a filename) and the entry point (the file calling registerRoot, typically src/index.ts).
• Target: platform/aspect (landscape 16:9, vertical 9:16, square), resolution (1080p default; 4K only on request), and whether transparency is needed.
• Machine cores (for concurrency) and whether this is one render, an iteration session, or a batch.

Step 2: The base render

npx remotion render src/index.ts <CompositionId> out/video.mp4

Default output is H.264 MP4 at the composition's own width/height/fps; Remotion creates out/ if needed.