extract_video_frame

Extract a video frame

Save the first or last decoded frame of an owned video as a new image generation. Costs no credits; uses account storage. get_generation waits for the result. To go longer than one clip, carry the last frame into the next generate_clip, then join_clips. Not for speech: each line of a talking head starts from the same portrait, because chaining frames drifts the face.

Scope

generation.write — Makes, edits, imports, shares and deletes media in the account.

Behaviour

Writes: Creates or changes items in the caller's own account.
Adds or updates: Adds or updates; nothing the caller already has is deleted or overwritten.
Stays in the account: Stays inside the caller's private Kuro account: any media provider it calls acts on Kuro's account, and the result is visible to no one else.

Credits

What the tool's description says about credits, verbatim.

Costs no credits; uses account storage. get_generation waits for the result.

Inputs

sourceobject (type: "upload") or object (type: "generation") · required
positionstring · optional
one of "first", "last" · default "first"

Example call

A tools/call request with the required arguments only, each a placeholder read off the schema. Replace them before sending.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "extract_video_frame",
    "arguments": {
      "source": {
        "type": "upload",
        "upload_id": "00000000-0000-4000-8000-000000000000"
      }
    }
  }
}

Input schema

As the server sends it in tools/list.

{
  "type": "object",
  "properties": {
    "source": {
      "anyOf": [
        {
          "type": "object",
          "properties": {
            "type": {
              "type": "string",
              "const": "upload"
            },
            "upload_id": {
              "type": "string",
              "format": "uuid"
            }
          },
          "required": [
            "type",
            "upload_id"
          ],
          "additionalProperties": false
        },
        {
          "type": "object",
          "properties": {
            "type": {
              "type": "string",
              "const": "generation"
            },
            "generation_id": {
              "type": "string",
              "format": "uuid"
            }
          },
          "required": [
            "type",
            "generation_id"
          ],
          "additionalProperties": false
        }
      ]
    },
    "position": {
      "type": "string",
      "enum": [
        "first",
        "last"
      ],
      "default": "first"
    }
  },
  "required": [
    "source"
  ],
  "additionalProperties": false
}

Related tools

get_generation
Get current status and signed media URL for one generation.
generate_clip
Start a short video clip generation.
join_clips
Concatenate 2-20 images or clips, in the order given, into a single MP4 in the library.

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