# Ltx 2.3 Quality · Reference Video to Video API

> Cynhyrchu dan arweiniad anogiad gan ddefnyddio fideo cyfeirio, gyda delweddau ffrâm allweddol cyntaf, canol ac olaf dewisol

Yn creu fideo newydd o `prompt` gofynnol a `video_url` cyfeirio sy’n darparu symudiad a strwythur. Mae `image_url`, `mid_image_url` ac `end_image_url` dewisol yn angori’r wedd ar y dechrau, yn y canol ac ar y diwedd. Mae `video_strength` a `strength` (0 i 1 ill dau) yn rheoli pa mor agos y dilynir neu y cedwir y ffynhonnell, a gall `control_video_url` ddarparu signal rheoli wedi’i gyfrifo ymlaen llaw. Mae `resolution` yn cynnig rhagosodiadau awtomatig neu sefydlog fel sgwâr a phortread neu dirwedd 16:9.

- Model id: `ltx-2.3-quality/reference-video-to-video`
- Made by: Lightricks
- Category: Video to Video
- Output: video
- Price per megapixel of your output video: $0.00241 / megapixel of output video (cheapest run $0.003 (3 API credits))
- Run: `POST https://api.doitong.ru/v1/run/ltx-2.3-quality/reference-video-to-video`
- Quote: `POST https://api.doitong.ru/v1/quote/ltx-2.3-quality/reference-video-to-video`
- Docs page: https://doitong.com/cy/developers/models/ltx-2.3-quality/reference-video-to-video

## Pricing

Price: **$0.00241 / megapixel of output video**. Price per megapixel of your output video: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

The full example input below costs $0.27 = 270 API credits (112 MP output video × $0.002408).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.ru/v1/quote/ltx-2.3-quality/reference-video-to-video` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  |  | Anogiad a ddefnyddir i gyfarwyddo cynhyrchu. |
| `video_url` | `video` | string (video URL) | yes |  |  | URL sy’n cyfeirio at fideo cyfeirio a ddefnyddir i arwain symudiad a strwythur. |
| `control_video_url` |  | string (video URL) \| null | no |  |  | Fideo rheoli wedi’i gyfrifo ymlaen llaw yn ddewisol, a ddefnyddir yn lle amcangyfrif rheoli mewnol pan gaiff ei ddarparu ynghyd â `skip_control_preprocess`. Daw’n signal rheoli uniongyrchol ar ôl ei ailddosbarthu i gyd-fynd â dimensiynau allbwn a chyfrif fframiau. Gall y fideo gynnwys, er enghraifft, gyfansawdd dyfnder, ymylon neu ystum sydd eisoes wedi’i rendro. |
| `skip_control_preprocess` |  | boolean | no | `false` |  | Modd rheoli uniongyrchol sy’n defnyddio `control_video_url` yn lle amcangyfrif dyfnder, ymylon neu ystum yn fewnol; heb yr URL hwnnw, caiff y gosodiad ei anwybyddu. Mae maint allbwn yn y modd hwn yn parchu dimensiynau penodol gydag aliniad 64 i gadw fideos RGB a rheoli wedi’u cyfateb, tra bod `auto` yn defnyddio dimensiynau a chymhareb agwedd y ffynhonnell o fewn terfynau LTX. |
| `preserve_original_video` |  | boolean | no | `false` |  | Modd cadw’r fideo gwreiddiol, ar gael dim ond gyda `skip_control_preprocess`, `video_url`, a `control_video_url`. Wedi’i analluogi yn rhagosodedig, mae’n gadael prosesu rheoli safonol yn ei le; mae ei alluogi’n cychwyn cynhyrchu o `video_url` gan gadw canllaw strwythurol o `control_video_url`. Mae dad-sŵn drwy `strength` yn gosod faint a gedwir, gyda gosodiadau is yn cadw mwy o bicseli gwreiddiol. |
| `image_url` | `image` | string (image URL) \| null | no |  |  | Arddull angori delwedd ddewisol neu hunaniaeth cymeriad fel y keyframe ffrâm gyntaf. |
| `mid_image_url` |  | string (image URL) \| null | no |  |  | Ymddangosiad angori delwedd dewisol ger canol y clip, yn ategu’r keyframe `image_url` cychwynnol. Mae’n helpu’r ymddangosiad i ddilyn symudiad y camera yn hytrach na gwyro; mae angen `image_url`. |
| `end_image_url` | `end_image` | string (image URL) \| null | no |  |  | Ymddangosiad angori delwedd dewisol yn ffrâm olaf y clip. Yn ddefnyddiol pan fydd symudiad y camera’n gorffen mewn lleoliad gwahanol i’r ddelwedd gychwynnol; mae angen `image_url`. |
| `video_strength` |  | number | no | `0.6` | 0 – 1 | Mae’r rhyddid i newid symudiad a strwythur o’r fideo cyfeirio yn cael ei reoli gan y cryfder cyflyru hwn: mae gosodiadau llai’n caniatáu mwy o newidiadau. |
| `strength` |  | number | no | `1` | 0 – 1 | Rheoli dad-sŵn ar gyfer samplu fideo-i-fideo o fideo cyfeirio, y mae ei effaith yn dibynnu ar `preserve_original_video`. Pan fo’r modd hwnnw i ffwrdd, mae’n byrhau’r amserlen dad-sŵn yn unig; pan fo ymlaen, mae’n rheoli trawsffurfio picseli’r ffynhonnell, gyda 1.0 yn ailgynhyrchu popeth a gosodiadau is yn cadw mwy (er enghraifft, mae 0.5 yn cadw tua 50%). |
| `num_frames` |  | integer | no | `121` | 9 – 481 | Cyfrif fframiau allbwn, yn amodol ar gyllideb sefydlogrwydd IC-LoRA yn seiliedig ar gydraniad wedi’i luosi â fframiau. Mae ymateb 422 yn golygu bod y gyllideb honno wedi’i rhagori: gostyngwch y cydraniad neu `num_frames`. Mae’r gyllideb yn caniatáu tua 150 ffrâm ar ddimensiynau dosbarth 720p a mwy ar feintiau llai. |
| `resolution` |  | object {width, height} \| enum (string) | no | `auto` | `auto`, `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9` | Dimensiynau fideo allbwn, sydd hefyd yn effeithio ar hyd sefydlog: mae meintiau llai’n caniatáu mwy o fframiau, tra bod rhai mwy’n gostwng yr uchafswm. Mae amcangyfrif rheoli mewnol yn cadw’r maint yn agos at lif gwaith rheoli swyddogol; mae rheoli uniongyrchol drwy `skip_control_preprocess` a `control_video_url` yn hytrach yn parchu dimensiynau penodol gydag aliniad 64px. Yn y modd rheoli uniongyrchol, mae `auto` yn etifeddu dimensiynau a chymhareb agwedd y ffynhonnell o fewn terfynau LTX. |
| `frames_per_second` |  | number | no | `24` | 1 – 60 | Cyfradd fframiau fideo'r allbwn, wedi'i mesur mewn fframiau yr eiliad. |
| `num_inference_steps` |  | integer | no | `15` | 8 – 30 | Gosodwch faint o gamau casglu i redeg, hyd at 30; mae gadael hwn heb ei newid yn defnyddio 15. |
| `guidance_scale` |  | number | no | `1` | 1 – 20 | Addaswch arweiniad heb ddosbarthwr gan ddefnyddio'r raddfa hon; mae ei thiwnio rhagosodedig yn targedu ansawdd uchel a chynhyrchu cyflym. |
| `generate_audio` |  | boolean | no | `true` |  | Toglo trac sain ar gyfer yr MP4 a ddychwelir: mae i ffwrdd yn cynhyrchu ffeil fideo yn unig, ac mae ymlaen yn cynnwys sain. |
| `negative_prompt` |  | string | no | `color distortion, overexposure, static, blurry details, subtitles, style, artwork, painting, frame, still, dim overall tone, worst quality, low quality, JPEG compression artifacts, ugly, mutilated, extra fingers, poorly drawn hands, poorly drawn face, deformed, disfigured, malformed limbs, fused fingers, motionless frame, cluttered background, three legs, crowded background, walking backwards` |  | Anogiad negyddol sy'n nodi'r hyn y dylai cynhyrchu ei osgoi. |
| `seed` |  | integer \| null | no |  |  | Hadau sy'n gwneud cynhyrchu'n atgynhyrchadwy. Mae ei osod i None yn dewis hedyn ar hap. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Yn rheoli a yw ehangu'r anogiad wedi'i alluogi. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Rheoli a yw gwiriad diogelwch wedi'i alluogi. |
| `video_quality` |  | enum (string) | no | `high` | `low`, `medium`, `high`, `maximum` | Rhagosodiad ansawdd a gymhwysir i'r fideo allbwn. |
| `video_write_mode` |  | enum (string) | no | `balanced` | `fast`, `balanced`, `small` | Modd ysgrifennu'r fideo sy'n deillio o hynny. |

File parameters (`video`, `control_video_url`, `image`, `mid_image_url`, `end_image`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.ru/v1/run/ltx-2.3-quality/reference-video-to-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.ru/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/ltx-2.3-quality/reference-video-to-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.ru/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/ltx-2.3-quality/reference-video-to-video", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.ru/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "ltx-2.3-quality/reference-video-to-video",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "ltx-2.3-quality/reference-video-to-video",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 270,
    "usd": "0.27",
    "charged": 270,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    },
    "seed": 42,
    "prompt": "string"
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} | Fideo a gynhyrchwyd gan y model. |
| `seed` | integer | Yr had gwirioneddol a gymhwysir wrth gynhyrchu. |
| `prompt` | string | Anogiad cynhyrchu, gan gynnwys unrhyw ehangu a gymhwysir cyn ei ddefnyddio. |

## Related models

- [Ltx 2.3 Quality · Text to Video](https://doitong.com/developers/models/ltx-2.3-quality/text-to-video.md) (`ltx-2.3-quality/text-to-video`): $0.00241 / megapixel of output video
- [Ltx 2.3 Quality · Text to Video · LoRA](https://doitong.com/developers/models/ltx-2.3-quality/text-to-video/lora.md) (`ltx-2.3-quality/text-to-video/lora`): $0.00271 / megapixel of output video
- [Ltx 2.3 Quality · Image to Video](https://doitong.com/developers/models/ltx-2.3-quality/image-to-video.md) (`ltx-2.3-quality/image-to-video`): $0.00241 / megapixel of output video
- [Ltx 2.3 Quality · Image to Video · LoRA](https://doitong.com/developers/models/ltx-2.3-quality/image-to-video/lora.md) (`ltx-2.3-quality/image-to-video/lora`): $0.00271 / megapixel of output video
- [Ltx 2.3 Quality · Ingredient](https://doitong.com/developers/models/ltx-2.3-quality/ingredient.md) (`ltx-2.3-quality/ingredient`): $0.00241 / megapixel of output video
- [Ltx 2.3 Quality · Clean Plate](https://doitong.com/developers/models/ltx-2.3-quality/clean-plate.md) (`ltx-2.3-quality/clean-plate`): $0.00241 / megapixel of output video
- [Ltx 2.3 Quality · Colorization](https://doitong.com/developers/models/ltx-2.3-quality/colorization.md) (`ltx-2.3-quality/colorization`): $0.00241 / megapixel of output video
- [Ltx 2.3 Quality · Cross Eyed](https://doitong.com/developers/models/ltx-2.3-quality/cross-eyed.md) (`ltx-2.3-quality/cross-eyed`): $0.00241 / megapixel of output video

## Links

- HTML page: https://doitong.com/developers/models/ltx-2.3-quality/reference-video-to-video
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=ltx-2.3-quality/reference-video-to-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/ltx-2.3-quality/reference-video-to-video