# TASK 19 — Scene transitions → MERGED into TASK 19/23 (Control Surface UX)

> Catalog: [`TASKS.md`](../TASKS.md) — status and requirements live here.


**Superseded by the Control Surface UX task.** Cut/Fade/Move transitions, thumbnails, edit mode, left panel two-state — all shipped as one cohesive feature. See the Control Surface UX section in `ai.md`.

### Design decisions

- **Cut is free** — instant switch, no blending, zero CPU cost. This is the default.
- **Fade is the minimum expectation** — 300ms crossfade is universal. Every streaming tool ships this.
- **Move is economical** — simple slide animation, no video decoding needed. Good middle ground.
- **Custom is premium** — media/stinger transitions require video playback. Heavy but expected by mid-tier streamers.
- Transitions happen in the compositor, not post-encode. The preview sees the same blend as the live output.