# Seedance 2.5 Edit (video)

> Seedance 2.5 Edit changes an existing clip by instruction. The output keeps the length, the framing and the timing of the source. Use it to put your product or your character into a clip that you want to keep.

Status: roasOS API v1.1. Catalog `model-catalog@2026-10-06.v5`, pricing `customer-pricing@2026-11-05.v15`. The endpoint `POST /v1/video/seedance-2.5-edit` is live. `POST /v1/generations` stays for one minor version as a deprecated alias (see "Today").

## Endpoint
POST https://api.roasos.com/v1/video/seedance-2.5-edit
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
Recasting a clip of 4 to 30 seconds. Send `video_url` and a `prompt` that names the change. Add `references` (up to 9 images), `avatar_id` (the character reference sheet of a saved avatar) or `product_id` (the shots of a product kit). The references bind as @Image1..N in this order: your references, the product shots, the avatar.

## Pricing
Unit: source_second. Pricing key: `seedance-2.5-edit`.

| request | credits |
|---|---|
| `4s_source_720p` | 15 |
| `15s_source_720p` | 54 |
| `30s_source_720p` | 108 |

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

## Modes
- `edit`
Provider endpoints: `bytedance/seedance-2.5/video-edit`.

## Request fields
| field | type | required | default | rule |
|---|---|---|---|---|
| `alter` | object | no | — | `{ mode, who, new_person, clothes, outfit, object, product, keep, multi_shot }` |
| `avatar_id` | string | no | — | UUID |
| `avatar_outfit` | string | no | — | ≤ 500 characters |
| `generate_audio` | boolean | no | `true` | — |
| `product_id` | string | no | — | UUID |
| `prompt` | string | no | — | ≥ 1 character; ≤ 10,000 characters |
| `quote_id` | string | no | — | UUID |
| `quote_only` | boolean | no | `false` | — |
| `references` | string[] | no | — | ≤ 9 items |
| `resolution` | enum | no | `720p` | `480p`, `720p`, `1080p` |
| `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
- `avatar_id` — identity; the saved character reference sheet, with a derived portrait only where the model requires a single face or source frame
- `product_id` — product; resolves to the product image list
- `references` — style and appearance references
- `video_url` — the source video
- Refused: `elements`, `product_images`, `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. Write the change as an instruction.
- Name only what changes: "Replace the bottle in her hand with the jar from @Image1."
- Say what must stay: the performance, the camera, the cuts and the timing.
- Do not ask for a new shot or a different length.

## Not exposed
- `duration_seconds`: pinned to `the output follows the source clip`.
- `aspect_ratio`: pinned to `the output keeps the source framing`.
- `seed`: not accepted by this public endpoint.
- `negative_prompt`: not accepted by this public endpoint.
- `bitrate_mode`: pinned to `provider default (high)`.
- `video_urls`: pinned to `only the source clip is accepted`.
- `audio_urls`: not accepted by this public endpoint.

## Result
Result kind `video`. Always present: `url`.
```json
{ "data": { "id": "gen_…", "kind": "video", "model": "seedance-2.5-edit", "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/seedance-2.5-edit \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-seedance-2.5-edit-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": 15, "expires_at": "…", "confirmation": { "model": "seedance-2.5-edit", "example": "4s_source_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/seedance-2.5-edit \
  -H "Authorization: Bearer roasos_sk_live_…" \
  -H "Idempotency-Key: 0f1c9e2a-seedance-2.5-edit-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": "seedance-2.5-edit", "status": "queued", "credits_reserved": 15, "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/seedance-2.5-edit` with `video_url`, `prompt`, `references`, `avatar_id`, `product_id`, `resolution` (480p|720p|1080p) and `generate_audio`.

## See also
https://docs.roasos.com/models/video/seedance-2.5-edit · https://api.roasos.com/v1/catalog/video/seedance-2.5-edit · bytedance/seedance-2.5/video-edit