{
  "openapi": "3.1.0",
  "info": {
    "title": "Generate a video from a video API",
    "version": "1.0.0"
  },
  "servers": [
    {
      "url": "https://api.cometapi.com"
    }
  ],
  "security": [
    {
      "bearerAuth": []
    }
  ],
  "paths": {
    "/runwayml/v1/video_to_video": {
      "post": {
        "summary": "Generate a video from a video",
        "operationId": "generate_a_video_from_a_video",
        "parameters": [
          {
            "name": "X-Runway-Version",
            "in": "header",
            "required": true,
            "description": "Runway API version header, for example `2024-11-06`.",
            "schema": {
              "type": "string"
            }
          }
        ],
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "videoUri",
                  "promptText",
                  "seed",
                  "model",
                  "references",
                  "ratio",
                  "contentModeration"
                ],
                "properties": {
                  "videoUri": {
                    "type": "string",
                    "description": "HTTPS URL of the source video, or a base64 data URI containing the video.",
                    "default": "https://your-video-host/source.mp4"
                  },
                  "promptText": {
                    "type": "string",
                    "description": "Text prompt describing the desired output. Maximum 1000 characters.",
                    "default": "A cat yawning in slow motion."
                  },
                  "seed": {
                    "type": "integer",
                    "description": "Random seed for reproducible results. Range: 0–4294967295.",
                    "default": 1
                  },
                  "model": {
                    "type": "string",
                    "description": "Model variant to use.",
                    "default": "gen4_aleph"
                  },
                  "references": {
                    "type": "array",
                    "description": "Optional reference images to guide generation. Each item must include `type` (e.g. `image`) and `uri` (HTTPS URL).",
                    "items": {
                      "type": "object",
                      "properties": {
                        "type": {
                          "type": "string"
                        },
                        "uri": {
                          "type": "string"
                        }
                      }
                    },
                    "default": [
                      {}
                    ]
                  },
                  "ratio": {
                    "type": "string",
                    "description": "Requested output frame shape. Use colon-separated values such as 1280:720 or 720:1280; read them as 1280x720 and 720x1280 targets. Do not assume every Runway video-to-video route accepts 1280x720 with an x separator.",
                    "default": "1280:720"
                  },
                  "contentModeration": {
                    "type": "object",
                    "required": [
                      "publicFigureThreshold"
                    ],
                    "properties": {
                      "publicFigureThreshold": {
                        "type": "string",
                        "description": "Threshold for public-figure detection. Use `auto` for default behavior."
                      }
                    },
                    "default": {
                      "publicFigureThreshold": "auto"
                    }
                  }
                },
                "default": {
                  "videoUri": "https://media.w3.org/2010/05/sintel/trailer.mp4",
                  "promptText": "Make the motion feel cinematic.",
                  "model": "gen4_aleph",
                  "references": [
                    {
                      "type": "image",
                      "uri": "https://res.cloudinary.com/demo/image/upload/dog.jpg"
                    }
                  ],
                  "ratio": "1280:720"
                }
              },
              "examples": {
                "Default": {
                  "summary": "Default",
                  "value": {
                    "videoUri": "https://media.w3.org/2010/05/sintel/trailer.mp4",
                    "promptText": "Make the motion feel cinematic.",
                    "model": "gen4_aleph",
                    "references": [
                      {
                        "type": "image",
                        "uri": "https://res.cloudinary.com/demo/image/upload/dog.jpg"
                      }
                    ],
                    "ratio": "1280:720"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "success",
            "content": {
              "application/json": {
                "schema": {
                  "type": "object",
                  "required": [
                    "id"
                  ],
                  "properties": {
                    "id": {
                      "type": "string",
                      "description": "The ID of the task that was created. Use this to retrieve the task later."
                    }
                  },
                  "example": {
                    "id": "12a01a5e-ab55-4aa7-b002-7b873546cf76"
                  }
                }
              }
            }
          }
        },
        "x-codeSamples": [
          {
            "lang": "Shell",
            "label": "Default",
            "source": "curl https://api.cometapi.com/runwayml/v1/video_to_video \\\n  -H \"Authorization: Bearer $COMETAPI_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\n      \"videoUri\": \"https://your-video-host/source.mp4\",\n      \"promptText\": \"Make the motion feel cinematic.\",\n      \"model\": \"gen4_aleph\",\n      \"references\": [\n        {\n          \"type\": \"image\",\n          \"uri\": \"https://your-image-host/style.jpg\"\n        }\n      ]\n    }'\n"
          },
          {
            "lang": "Python",
            "label": "Default",
            "source": "import os\nimport requests\n\nresponse = requests.post(\n    \"https://api.cometapi.com/runwayml/v1/video_to_video\",\n    headers={\"Authorization\": \"Bearer \" + os.environ[\"COMETAPI_KEY\"]},\n    json={\n            \"videoUri\": \"https://your-video-host/source.mp4\",\n            \"promptText\": \"Make the motion feel cinematic.\",\n            \"model\": \"gen4_aleph\",\n            \"references\": [\n                    {\n                            \"type\": \"image\",\n                            \"uri\": \"https://your-image-host/style.jpg\"\n                    }\n            ]\n    },\n)\n\ntask = response.json()\nprint(task[\"id\"])  # poll GET /runwayml/v1/tasks/{id} until the output array appears\n"
          },
          {
            "lang": "JavaScript",
            "label": "Default",
            "source": "const response = await fetch(\"https://api.cometapi.com/runwayml/v1/video_to_video\", {\n    method: \"POST\",\n    headers: {\n        Authorization: `Bearer ${process.env.COMETAPI_KEY}`,\n        \"Content-Type\": \"application/json\",\n    },\n    body: JSON.stringify({\n            \"videoUri\": \"https://your-video-host/source.mp4\",\n            \"promptText\": \"Make the motion feel cinematic.\",\n            \"model\": \"gen4_aleph\",\n            \"references\": [\n                {\n                    \"type\": \"image\",\n                    \"uri\": \"https://your-image-host/style.jpg\"\n                }\n            ]\n        }),\n});\n\nconst task = await response.json();\nconsole.log(task.id); // poll GET /runwayml/v1/tasks/{id} until the output array appears\n"
          }
        ]
      }
    }
  },
  "components": {
    "securitySchemes": {
      "bearerAuth": {
        "type": "http",
        "scheme": "bearer",
        "description": "Bearer token authentication. Use your CometAPI key."
      }
    }
  }
}