Veo 3.1 Fast (First+Last frame)

{
  "model_id": "fal-ai/veo3.1/fast/first-last-frame-to-video",
  "prompt": "Upload a start and end frame — Veo 3.1 Fast interpolates a smooth high-quality transition between them at speed",
  "image_url": "https://example.com/image",
  "end_image_url": "https://example.com/end_image"
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.artemotion.ai/api/v1/models?id=fal-ai%2Fveo3.1%2Ffast%2Ffirst-last-frame-to-video",
  "title": "Veo 3.1 Fast (First+Last frame) generation request",
  "description": "Request body accepted by POST /api/v1/generate for fal-ai/veo3.1/fast/first-last-frame-to-video.",
  "type": "object",
  "properties": {
    "model_id": {
      "type": "string",
      "const": "fal-ai/veo3.1/fast/first-last-frame-to-video",
      "description": "ArtEmotion model identifier."
    },
    "extra": {
      "type": "object",
      "additionalProperties": true,
      "description": "Model-specific settings may also be nested here."
    },
    "max_credits": {
      "type": "number",
      "minimum": 1,
      "description": "Reject before submission if the estimated list price exceeds this cap."
    },
    "webhook_url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048
    },
    "webhook_secret": {
      "type": "string",
      "maxLength": 512
    },
    "folder_id": {
      "type": "string"
    },
    "prompt": {
      "type": "string"
    },
    "auto_fix": {
      "title": "Auto Fix",
      "description": "Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them.",
      "default": false,
      "type": "boolean"
    },
    "first_frame_url": {
      "title": "First Frame Url",
      "description": "URL of the first frame of the video. Overrides the uploaded start frame.",
      "type": "string"
    },
    "safety_tolerance": {
      "title": "Safety Tolerance",
      "description": "The safety tolerance level for content moderation. 1 is the most strict (blocks most content), 6 is the least strict.",
      "default": "4",
      "type": "number",
      "enum": [
        1,
        2,
        3,
        4,
        5,
        6
      ]
    },
    "seed": {
      "title": "Seed",
      "description": "The seed for the random number generator.",
      "type": "integer"
    },
    "negative_prompt": {
      "title": "Negative Prompt",
      "description": "A negative prompt to guide the video generation.",
      "type": "string"
    },
    "last_frame_url": {
      "title": "Last Frame Url",
      "description": "URL of the last frame of the video. Overrides the uploaded end frame.",
      "type": "string"
    },
    "aspect_ratio": {
      "type": "string",
      "enum": [
        "auto",
        "16:9",
        "9:16"
      ]
    },
    "resolution": {
      "type": "string",
      "enum": [
        "720p",
        "1080p",
        "4k"
      ]
    },
    "duration": {
      "type": "number",
      "enum": [
        4,
        6,
        8
      ]
    },
    "image_url": {
      "type": "string",
      "format": "uri"
    },
    "end_image_url": {
      "type": "string",
      "format": "uri"
    }
  },
  "required": [
    "model_id",
    "prompt",
    "image_url",
    "end_image_url"
  ],
  "additionalProperties": false
}