# Skill: effect/flash-white — "הבזק לבן" (Impact flash)

A white flash for a frame or two — on a hit, a cut or a punchline; the whole frame or one region.
הבזק לבן לפריים או שניים — על מכה, חיתוך או פאנץ׳; כל הפריים או אזור אחד.

Category: Overlays & graphics · שכבות וגרפיקה · a real preview: https://media.gpt.org.il/lookbook/effects/flash-white.mp4?v=mv19exzc
Price: **60 credits per finished minute**: the render itself — 1 credit per second of 1080p output. Combined with captions, a hook or other effects: still one render, nothing more for combining.

Base URL: `https://apihub.co.il` · Auth: `Authorization: Bearer <API key>` · Docs: `/docs` (group "Video Effects")
Send `X-Tag: <job name>` on every call of one video; `GET /v1/usage?tag=<job name>` returns what it cost.
**Files are kept 24 hours** — download the finished video.

---

## 1. On its own — one call

```jsonc
POST /v1/effects/flash-white             // x-wait-ms: 110000
{
  "video_url": "https://media.gpt.org.il/samples/sample-he.mp4",
  "start": 1.1,
  "params": {
    "ms": 100
  }
}
```

A normal render: `status: processing` → poll `GET /v1/executions/{id}` until `completed`, then read `output.url`.

When it plays: a moment: `start` (seconds of the finished video) or `at` (a word id).

## 2. With captions, a hook and other effects — the same render

```jsonc
POST /v1/studio/edit               // x-wait-ms: 110000
{
  "video_url": "<the video>",
  "language_code": "he",
  "captions": {
    "style": "classic"
  },
  "effects": [
    {
      "id": "flash-white",
      "params": {
        "ms": 100
      },
      "start": 1.1
    }
  ],
  "audio": {
    "normalize": true
  },
  "output": {
    "aspect_ratio": "9:16",
    "resolution": "1080",
    "fit": "crop",
    "quality": "high"
  }
}
```

`effects` is a list: add more entries for more effects. The engine applies them by pipeline stage (cuts and time →
camera → grade and looks → overlays → text and captions → sound), never by their order in the list. An edit has one
`transition`, one `color` grade, one `music` bed, one `speed` and one caption style: two effects that set the same
one are refused with a message that names them.

## 3. Params

| param | default | range / options | what it does |
|---|---|---|---|
| `color` | `"#FFFFFF"` | string | The flash colour |
| `opacity` | `0.75` | 0.1–1 | How strong at its peak |
| `ms` | `80` | 33–400 | How long it lasts, ms |
| `fade_ms` | `40` | 0–300 | Fade out, ms |
| `rect` | `null` | value | Only this part of the frame (null = the whole frame) |

GET `/v1/effects/flash-white` returns the same as JSON (with the full body schema). Every field has a default; numbers
outside their range are refused with the field's name.