API reference · Google

google/veo3.1/fast/first-last-frame-to-video

Integrate this model through SandBase's unified API, with production-ready schemas and examples.

VIDEOAsyncOpen model

Production endpoint

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OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDgoogle/veo3.1/fast/first-last-frame-to-video

Input Schema

8 parameters · 1 required · 7 optional

Parameter	Type	Required	Description
`prompt`	string	Required	The text prompt describing the video you want to generate · Max length: 20000
`seed`	integer	Optional	The seed for the random number generator.
`duration`	integer	Optional	The duration of the generated video. · Options: 4, 6, 8 · Default: 8 468
`resolution`	string	Optional	The resolution of the generated video. · Options: 720p, 1080p, 4k · Default: "720p" 720p1080p4k
`aspect_ratio`	string	Optional	The aspect ratio of the generated image. · Options: 21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16 21:916:93:24:35:41:14:53:42:39:16
`generate_audio`	boolean	Optional	Whether to generate audio for the video. · Default: true
`last_frame_url`	string	Optional	URL of the last frame of the video
`first_frame_url`	string	Optional	URL of the first frame of the video

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
  "model": "google/veo3.1/fast/first-last-frame-to-video",
  "prompt": "A woman looks into the camera, breathes in, then exclaims energetically, \"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Fal? It's incredible!\"",
  "duration": 8,
  "resolution": "720p",
  "generate_audio": true,
  "last_frame_url": "https://static.sandbase.ai/examples/google/veo3.1/fast/first-last-frame-to-video/input_last_frame_url_1.jpeg",
  "first_frame_url": "https://static.sandbase.ai/examples/google/veo3.1/fast/first-last-frame-to-video/input_first_frame_url_0.jpeg"
}'

# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
  -H "Authorization: Bearer YOUR_API_KEY"

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