# Ltx 2.3 Quality · Reference Video to Video API

> Keripe lidžardo e promptosa thaj jekhe referencake videosa, e opcionalno anglune, maškarune thaj palune keyframe kipenca

Kerel jekh nevo video andar jekh trubutno `prompt` thaj jekh referencako `video_url` savo del čalipe thaj struktura. Opcionalno `image_url`, `mid_image_url` thaj `end_image_url` fiksirin o dićhipe ko šerutnipe, maškar thaj agor. `video_strength` thaj `strength` (soduj 0 dži ko 1) kontrolirin sar paše džal palal vaj arakhel o šerutno, thaj `control_video_url` šaj te del jekh anglokalkulime kontrolako signalo. `resolution` del auto vaj fiksime preset sar kvadratno thaj 16:9 portretno vaj horizontalno.

- 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/rom/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 |  |  | Prompto labardo te direktinel o keripe. |
| `video_url` | `video` | string (video URL) | yes |  |  | URL savo sikavel pe referenca-video la motion thaj struktura te dživarel. |
| `control_video_url` |  | string (video URL) \| null | no |  |  | Opcionalno angle-kertuno control video, savo o built-in control estimation thavdel, kana si jekhetane `skip_control_preprocess`-sa. Ovel direktno control signal pale resampling, te jekhavel e output-dimenzije thaj kadro gind. O video šaj te avel depth-, edge- vaj pose-kompozicija kerdini angleder. |
| `skip_control_preprocess` |  | boolean | no | `false` |  | Modo direktnone kontrolako savo koristinel `control_video_url` pe than e andrune procenako e thulikane distancako, e randenengo vaj e pozako; bi akava URL-o, akava arakhadipe na lel pes andre. E rezultatoske dimenzije ande akava modo respektinen eksplicitne dimenzije uskladime pe 64, te ačhen jekhavereske e RGB thaj kontrolake video, kana `auto` lel e izvoroske dimenzije thaj e rigengo proporcija andre e LTX limitura. |
| `preserve_original_video` |  | boolean | no | `false` |  | Modo arakhadimaske e originalnone videosko, savo šaj te koristinel pes numa le `skip_control_preprocess`, `video_url` thaj `control_video_url`. Standardno si phandlo thaj mukhel e standardno kontrolako procesiripe bizo paruvdipe; kana putrel pes, o keripe širdel katar `video_url`, thaj arakhel e strukturako sikavipe katar `control_video_url`. O šumako xasaripe preko `strength` čhivel kobor arakhel pes, thaj e tikneder arakhadimata arakhen majbut originalne pikselura. |
| `image_url` | `image` | string (image URL) \| null | no |  |  | Opcionalno kipo-ankorilutno stil vaj karakter-identiteto sar o angluno-kadro keyframe. |
| `mid_image_url` |  | string (image URL) \| null | no |  |  | Opcionalno kipo-ankorilutni dikhipen pašo cliposko maškar, savo pherel e angluno `image_url` keyframe. Šaj te ačharel e dikhipen kamera-movimentosar; manghel `image_url`. |
| `end_image_url` | `end_image` | string (image URL) \| null | no |  |  | Opcionalno kipo-ankorilutni dikhipen andro cliposko agorutno kadro. Lačho kana e kamera ačhol aver thanestar sar o angluno kipo; manghel `image_url`. |
| `video_strength` |  | number | no | `0.6` | 0 – 1 | E sloboda te paruvarel e motion thaj struktura e referenca-videosar, kontroluil kadava conditioning strength: cikne settingura den maj-bari paruvipen. |
| `strength` |  | number | no | `1` | 0 – 1 | Denoising kontrola referenca-video-to-video samplingoske; e efekto dependuil pe `preserve_original_video`. Kana si off, numa ciknarel e denoising schedule; kana si on, kontroluil e source-pixel paruvipen. 1.0 regeneril sa, tele settingura ačharen maj-but, sar 0.5 savo ačharel približnime 50%. |
| `num_frames` |  | integer | no | `121` | 9 – 481 | Rezultato kadro gind, IC-LoRA stability-budžetoha, savo si rezolucija x kadro. 422 response phenel kaj o budžeto si pherdo: ciknaren e rezolucija vaj `num_frames`. O budžeto den približnime 150 kadro 720p-klasos dimenzijenca, thaj maj-but cikne size-enca. |
| `resolution` |  | object {width, height} \| enum (string) | no | `auto` | `auto`, `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9` | Rezultato video-dimenzije, save keren i stabilno durata: cikne size-a mukhen maj-but kadro, bare size-a lel tele o maksimum. Built-in control estimation ačharel o size paše official control workflow; direktno control `skip_control_preprocess` thaj `control_video_url`-enca respektuil explicitno dimenzije 64px alignment-esa. Direktno-control modosko `auto` lel e fonte-dimenzije thaj aspect ratio andro LTX limitura. |
| `frames_per_second` |  | number | no | `24` | 1 – 60 | E rezultatoske videoski frekvencija e kadronengi, merimi kadronenca pe sekunda. |
| `num_inference_steps` |  | integer | no | `15` | 8 – 30 | Thaven keci inference steps te keren, dži ko 30; te na paruven, labarel 15. |
| `guidance_scale` |  | number | no | `1` | 1 – 20 | Paruven classifier-free guidance kadale scale-sa; lesko standardno tuning targetinel baro quality thaj sig keripe. |
| `generate_audio` |  | boolean | no | `true` |  | Audio-track toggle vaš o MP4 savo aven: off kerel numa video fajlo, on thavel audio. |
| `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` |  | Negative prompto savo phenel so o keripe na trubul te kerel. |
| `seed` |  | integer \| null | no |  |  | Seed savo kerel o generiripe reproducibilno. Te postavil pes pe None, randomno kidel pes seed. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Kontrolisarel te si aktivno prompto barvalipen. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Kontrolinel, si li aktivno o bezbednostno proveripe. |
| `video_quality` |  | enum (string) | no | `high` | `low`, `medium`, `high`, `maximum` | Quality preset aplikime pe o rezultato video. |
| `video_write_mode` |  | enum (string) | no | `balanced` | `fast`, `balanced`, `small` | Pisimen modo vaš o rezultato-video. |

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} | Video kerdo le modelostar. |
| `seed` | integer | Realno seed aplikime ande o keripe. |
| `prompt` | string | Keriепe prompto, le sako expansion-esa aplikime angl te labaren les. |

## 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