How to Reuse Your Canvas 2D Rendering Pipeline for Live Video Preview (No Duplicate Code)
typescript
dev.to
When you build a browser-based video export pipeline with Canvas 2D + MediaRecorder, you'll quickly hit a problem: you also need a live preview — playing the video with captions overlaid in real time, so users can verify what the export will look like before it starts. The naive solution is to write the caption-drawing code twice: once for the export loop and once for the preview loop. But there's a much better way — expose your draw functions and share them. The Setup: Shared Draw Fu