API reference · MiniMax

minimax/h3-max-turbo/video-extend

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 IDminimax/h3-max-turbo/video-extend

Input Schema

8 parameters · 2 required · 6 optional

Parameter	Type	Required	Description
`video`	string	Required	URL of the video to extend. Must be 1.625 s to 60 s long, up to 50 MB, aspect ratio between 0.4 and 2.5. · Min length: 1
`prompt`	string	Required	What happens next. Describe the continuation, not the source. · Min length: 1 · Max length: 50000
`seed`	integer	Optional	Seed for the continuation. Random when omitted.
`output`	string	Optional	'extended' returns the whole source video followed by the new footage. 'continuation' returns only the generated continuation. · Options: extended, continuation · Default: "extended" extendedcontinuation
`duration`	integer	Optional	Seconds of new footage to add after the source. The actual duration may be slightly longer. · Min: 1 · Max: 15 · Default: 5
`resolution`	string	Optional	Output video resolution. · Options: 480P, 768P, 1080P, 2K · Default: "768P" 480P768P1080P2K
`aspect_ratio`	string	Optional	Output aspect ratio. Matches the source video when omitted. · Options: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 21:916:94:31:13:49:16
`reference_audio_urls`	string[]	Optional	Optional audio references for the continuation (2–15 seconds each, 15 seconds combined). The full extended video retains its original source soundtrack, and its ending still conditions the transition. These clips guide the newly generated audio instead of using that soundtrack as an audio reference. Assign each clip a role in the prompt, such as 'Audio 1 for the voice' and 'Audio 2 for background music'.

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

const apiKey = process.env.SANDBASE_API_KEY;
const response = await fetch("https://api.sandbase.ai/v1/run", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "minimax/h3-max-turbo/video-extend",
    "video": "https://storage.googleapis.com/falserverless/example_inputs/flux-3-red-panda.mp4",
    "output": "extended",
    "prompt": "The red panda keeps walking along the log, then looks up at a bird.",
    "duration": 5,
    "resolution": "768P"
  }),
});

if (!response.ok) throw new Error(await response.text());
let result = await response.json();
for (let attempt = 0; attempt < 120 && !["completed", "failed", "timeout"].includes(result.status); attempt++) {
  await new Promise((resolve) => setTimeout(resolve, 2_000));
  const poll = await fetch(`https://api.sandbase.ai/v1/run/${result.id}`, {
    headers: { Authorization: `Bearer ${apiKey}` },
  });
  if (!poll.ok) throw new Error(await poll.text());
  result = await poll.json();
}
if (result.status !== "completed") throw new Error(`Generation ended: ${result.status}`);
console.log(result);

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