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Rendering is pre-release but wired end to end.

The production end-to-end kavio render command exists for opaque video outputs, with some formats reserved for later render paths.

Implemented Pieces

Schema validation for composition documents.
Timeline evaluation and frame math in the core package.
Browser preview runtime for visual inspection.
Render-worker contracts, frame capture helpers, batch expansion, metadata, and cleanup primitives.
Inspectable FFmpeg plan construction.
Playwright-backed browser capture, FFmpeg execution, and CLI rendering.
MVP demo rendering through the shared render pipeline.

Intended Pipeline

Validate the composition and prop rows.
Expand template rows across export presets into stable jobs.
Capture frames through the browser renderer.
Build an inspectable FFmpeg plan.
Encode media outputs and write metadata.
Clean temporary files according to job policy.

Current Limits

The current render path supports opaque mp4, webm, mov, gif, transparent webm/mov, and still-image png outputs (opaque or with a real alpha channel, no FFmpeg step). Video-in-video composites as picture-in-picture planes. png-sequence archives and golden-frame comparison remain future work.