---
title: "Toggle Fade to Black on a vision mixer block."
method: POST
path: "/api/flows/{flow_id}/blocks/{block_id}/ftb"
tags: ["flows"]
---

# Toggle Fade to Black on a vision mixer block.

`POST /api/flows/{flow_id}/blocks/{block_id}/ftb`

## Path parameters

- `flow_id` string, required
- `block_id` string, required

## Request body

- FadeToBlackRequest — Request to toggle Fade to Black on a vision mixer block.
  - `duration_ms` integer, required — Duration in milliseconds (0 = instant)

## Response `200`

FTB toggled

- FadeToBlackResponse — Response after toggling Fade to Black.
  - `active` boolean, required
  - `message` string, required

## Other responses

- `400` — Invalid request

---

[API](https://skmtc.dev/eyevinn/apis/strom-api.md) · [All operations](https://skmtc.dev/eyevinn/apis/strom-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/eyevinn/strom-api/revisions/0df7ca64263f/schema)