# Gemini Omni Flash Extend (video)

> Gemini Omni Flash Extend adds 3 to 10 seconds after an existing clip. The model reads the last 10 seconds of the source, so the motion, the camera and the sound continue across the join. The result is the source followed by the new footage, in one clip.

Status: roasOS API v1.1. Catalog `model-catalog@2026-10-06.v5`, pricing `customer-pricing@2026-11-05.v15`. The endpoint `POST /v1/video/gemini-omni-flash-extend` is live. `POST /v1/generations` stays for one minor version as a deprecated alias (see "Today").

## Endpoint
POST https://api.roasos.com/v1/video/gemini-omni-flash-extend
Auth: Authorization: Bearer roasos_sk_… (scope api:write). Idempotency-Key required. quote_only / quote_id / webhook_url as in https://docs.roasos.com/llms.txt.

## Good at
Grow a take past its first render without a visible cut: a talking head that keeps speaking, a camera move that keeps going, a product reveal after a UGC clip. Send `video_url` (1 to 60 seconds, up to 100 MiB, MP4) and `prompt`. `duration_seconds` sets the new footage (3 to 10). The source sets the framing, so there is no aspect ratio. Sound is always generated. You cannot send an audio file. The source does not have to be a Gemini clip.

## Pricing
Unit: clip. Pricing key: `gemini-omni-flash-extend`.

| request | credits |
|---|---|
| `3s_720p` | 3 |
| `7s_720p` | 7 |
| `10s_720p` | 10 |

Credits come from the roasOS pricing table (`MODEL_COSTS`) through the catalog. No other field changes the price.

## Modes
- `edit`
Provider endpoints: `google/gemini-omni-flash/v1.2/extend`.

## Request fields
| field | type | required | default | rule |
|---|---|---|---|---|
| `duration_seconds` | integer enum | no | `8` | `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10` |
| `prompt` | string | yes | — | ≥ 1 character; ≤ 10,000 characters |
| `quote_id` | string | no | — | UUID |
| `quote_only` | boolean | no | `false` | — |
| `resolution` | enum | no | `720p` | `360p`, `720p`, `1080p`, `4k` |
| `video_url` | string | yes | — | https URL; ≤ 4,096 characters |
| `wait_timeout_seconds` | integer | no | `0` | 0–60 |
| `webhook_url` | string | no | — | https URL; ≤ 4,096 characters |

The schema is strict: a field that is not in this table returns `400 unsupported_option`. Field names are the roasOS role names, one name per role across every family.

## Media
- `video_url` — the source video
- Refused: `avatar_id`, `elements`, `product_id`, `product_images`, `references`, `reference_images`, `image_url`, `end_image_url`, `scene_id`, `scene_image`, `video_urls`, `audio_urls`, `audio_url`, `voice_id`. A refused role returns `400 unsupported_option`.
- Every URL must be an immutable object on `https://cdn.roasos.com/…` that your workspace owns; any other URL is `400 reference_media_not_workspace_owned`. Upload with `POST /v1/uploads` (direct POST of the bytes to `put_url`, or a `source_url` import), then use the returned CDN URL.

## Prompt
Limit 10,000 characters.
- Describe what happens next, not the source. The model reads the source.
- Keep one action and one camera move, and say where the move ends.
- To continue speech, quote the next line with the speaker and the delivery.

## Not exposed
- `aspect_ratio`: not accepted by this public endpoint.
- `generate_audio`: not accepted by this public endpoint.
- `audio`: pinned to `no audio input exists on the provider; sound is always generated`.

## Result
Result kind `video`. Always present: `url`.
```json
{ "data": { "id": "gen_…", "kind": "video", "model": "gemini-omni-flash-extend", "status": "completed", "result": {"url":"https://cdn.roasos.com/workspaces/ws_01/result"} } }
```
Files live on `https://cdn.roasos.com` and are immutable; a result URL can be a media input to the next call. Poll `GET /v1/jobs/{id}/status` → `{ id, status, updated_at }`, then `GET /v1/jobs/{id}/result` (`409 run_not_completed` until the job is `completed`, `failed` or `canceled`). Statuses: `queued → processing → completed | failed | canceled`.

## Example
```bash
# 1. quote — nothing is spent
curl -X POST https://api.roasos.com/v1/video/gemini-omni-flash-extend \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-gemini-omni-flash-extend-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera.","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# → 200 { "data": { "kind": "quote", "quote_id": "q_7Hk…", "credits": 3, "expires_at": "…", "confirmation": { "model": "gemini-omni-flash-extend", "example": "3s_720p" } } }

# 2. run — the same body and the same Idempotency-Key, quote_id instead of quote_only
curl -X POST https://api.roasos.com/v1/video/gemini-omni-flash-extend \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-gemini-omni-flash-extend-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk…","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera.","video_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/video_url.mp4"}'
# → 201 { "data": { "id": "gen_…", "kind": "video", "model": "gemini-omni-flash-extend", "status": "queued", "credits_reserved": 3, "links": { "status": "/v1/jobs/gen_…/status", "result": "/v1/jobs/gen_…/result" } } }

# 3. poll
curl https://api.roasos.com/v1/jobs/gen_…/status -H "Authorization: Bearer roasos_sk_live_…"
curl https://api.roasos.com/v1/jobs/gen_…/result -H "Authorization: Bearer roasos_sk_live_…"
```

## Today
`POST /v1/video/gemini-omni-flash-extend` with `video_url`, `prompt`, `duration_seconds` (3-10, default 8) and `resolution` (360p|720p|1080p|4k, default 720p). The agent `extendVideo` tool uses this lane for Gemini clips.

## See also
https://docs.roasos.com/models/video/gemini-omni-flash-extend · https://api.roasos.com/v1/catalog/video/gemini-omni-flash-extend · google/gemini-omni-flash/v1.2/extend