Ltx LTX-2 19B Image-to-Video LoRA API | Pricing & Docs

ltx/ltx-2-19b/image-to-video/lora

Generate dynamic videos from a single image using Lightricks LTX-2 19B Image-to-Video LoRA, delivering realistic motion, audio sync, and style consistency through a high-performance diffusion transformer.

1. Get started

Use RunComfy's API to run ltx/ltx-2-19b/image-to-video/lora. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/ltx/ltx-2-19b/image-to-video/lora \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "image": "https://playgrounds-storage-public.runcomfy.net/tools/7311/media-files/input-1-1.png",
    "prompt": "A man plays with his dog in a quiet backyard, tossing a ball and laughing as the dog runs back to him; soft afternoon light, natural movement, warm and peaceful mood."
  }'

2. Authentication

Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.

3. API reference

Submit a request

Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/ltx/ltx-2-19b/image-to-video/lora \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "image": "https://playgrounds-storage-public.runcomfy.net/tools/7311/media-files/input-1-1.png",
    "prompt": "A man plays with his dog in a quiet backyard, tossing a ball and laughing as the dog runs back to him; soft afternoon light, natural movement, warm and peaceful mood."
  }'

Monitor request status

Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
  --header "Authorization: Bearer <token>"

Retrieve request results

Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
  --header "Authorization: Bearer <token>"

Cancel a request

Cancel a queued job by request_id, in-progress jobs cannot be cancelled.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
  --header "Authorization: Bearer <token>"

4. File inputs

Hosted file (URL)

Provide a publicly reachable HTTPS URL. Ensure the host allows server‑side fetches (no login/cookies required) and isn't rate‑limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre‑signed URLs for private assets.

5. Schema

Input schema

{
  "type": "object",
  "title": "Input",
  "required": [
    "image",
    "prompt"
  ],
  "properties": {
    "image": {
      "title": "Image",
      "description": "The image for the generation.",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7311/media-files/input-1-1.png"
    },
    "prompt": {
      "title": "Prompt",
      "description": "",
      "type": "string",
      "default": "A man plays with his dog in a quiet backyard, tossing a ball and laughing as the dog runs back to him; soft afternoon light, natural movement, warm and peaceful mood."
    },
    "resolution": {
      "title": "Resolution",
      "description": "Video resolution.",
      "type": "string",
      "enum": [
        "480p",
        "720p",
        "1080p"
      ],
      "default": "720p"
    },
    "duration": {
      "title": "Duration",
      "description": "The duration of the generated media in seconds.",
      "type": "integer",
      "minimum": 5,
      "maximum": 20,
      "default": 5
    },
    "loras": {
      "title": "LoRAs",
      "description": "List of LoRAs to apply (maximum 3).",
      "type": "array",
      "items": {
        "path": {
          "title": "LoRA Path",
          "description": "URL, HuggingFace repo ID (owner/repo), or local path to LoRA weights.",
          "type": "string",
          "format": "str",
          "default": ""
        },
        "scale": {
          "title": "LoRA Scale",
          "description": "Scale of the LoRA model.",
          "type": "float",
          "format": "float_slider_with_range",
          "minimum": 0,
          "maximum": 4,
          "default": 1
        }
      },
      "maxItems": 3,
      "minItems": 0
    },
    "seed": {
      "title": "Seed",
      "description": "",
      "type": "integer",
      "minimum": -1,
      "maximum": 2147483647,
      "default": -1
    }
  }
}

Output schema

{
  "output": {
    "type": "object",
    "properties": {
      "image": {
        "type": "string",
        "format": "uri",
        "description": "single image URL"
      },
      "video": {
        "type": "string",
        "format": "uri",
        "description": "single video URL"
      },
      "images": {
        "type": "array",
        "description": "multiple image URLs",
        "items": { "type": "string", "format": "uri" }
      },
      "videos": {
        "type": "array",
        "description": "multiple video URLs",
        "items": { "type": "string", "format": "uri" }
      }
    }
  }
}

RunComfy

RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.

LTX-2 19B Image-to-Video LoRA: Realistic Motion & Audio Synthesis from Still Images | RunComfy