API reference · HeyGen

heygen/lipsync/precision

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 IDheygen/lipsync/precision

Input Schema

8 parameters · 2 required · 6 optional

Parameter	Type	Required	Description
`audio`	string	Required	Input audio URL.
`video`	string	Required	Input video URL.
`end_time`	number	Optional	End time (seconds) for partial lipsync. · Min: 0
`start_time`	number	Optional	Start time (seconds) for partial lipsync. · Min: 0
`enable_caption`	boolean	Optional	Burn in captions. · Default: false
`disable_music_track`	boolean	Optional	Remove background music from the source video. · Default: false
`enable_dynamic_duration`	boolean	Optional	Allow the video length to follow the new audio. · Default: true
`enable_speech_enhancement`	boolean	Optional	Enhance the replacement audio. · Default: false

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": "heygen/lipsync/precision",
    "audio": "https://v3.fal.media/files/rabbit/Ql3ade3wEKlZXRQLRbhxm_tts.mp3",
    "video": "https://media.sandbase.ai/files/922d1013-9018-4956-a39d-d0859149ba76/0.mp4",
    "enable_caption": false,
    "disable_music_track": false,
    "enable_dynamic_duration": true,
    "enable_speech_enhancement": false
  }),
});

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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