API reference · Lightricks

lightricks/ltx-2.3-quality/audio-to-video

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

IMAGEAsyncOpen model

Production endpoint

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

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

Model IDlightricks/ltx-2.3-quality/audio-to-video

Input Schema

14 parameters · 2 required · 12 optional

Parameter	Type	Required	Description
`image`	string	Required	Optional URL of an image to use as the first frame. When omitted, generation runs from text and audio only.
`prompt`	string	Required	The prompt to guide the audio-driven video generation.
`seed`	integer	Optional	Random seed for reproducibility. If None, a random seed is chosen.
`audio`	string	Optional	The URL of the audio track that drives generation.
`num_frames`	integer	Optional	The number of frames to generate. · Min: 9 · Max: 481 · Default: 121
`resolution`	string	Optional	Final output size. 'auto' matches the input image aspect ratio when image_url is provided; otherwise it uses a landscape fallback. · Options: auto, square_hd, square, portrait_4_3, portrait_16_9, landscape_4_3, landscape_16_9 · Default: "auto" autosquare_hdsquareportrait_4_3portrait_16_9landscape_4_3landscape_16_9
`video_quality`	string	Optional	The quality preset of the generated video. · Options: low, medium, high, maximum · Default: "high" lowmediumhighmaximum
`generate_audio`	boolean	Optional	Whether to include audio in the returned video. When disabled, the final MP4 is returned without an audio track. · Default: true
`guidance_scale`	number	Optional	Classifier-free guidance scale. The default is tuned for fast, high-quality generation. · Min: 1 · Max: 20 · Default: 1
`image_strength`	number	Optional	Conditioning strength for the optional first frame. 1.0 keeps the image more strictly; lower values give the model more freedom. · Min: 0 · Max: 1 · Default: 0.7
`video_write_mode`	string	Optional	The write mode of the generated video. · Options: fast, balanced, small · Default: "balanced" fastbalancedsmall
`frames_per_second`	number	Optional	Frames per second of the generated video. · Min: 1 · Max: 60 · Default: 24
`match_audio_length`	boolean	Optional	When enabled, derives the number of frames from the audio duration and frames_per_second. When disabled, uses num_frames. · Default: true
`num_inference_steps`	integer	Optional	Number of inference steps. Defaults to 15 and can be increased up to 30. · Min: 8 · Max: 30 · Default: 15

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": "lightricks/ltx-2.3-quality/audio-to-video",
  "audio": "https://storage.googleapis.com/falserverless/example_inputs/ltx-2-a2v-input-audio.mp3",
  "image": "https://storage.googleapis.com/falserverless/example_inputs/ltx-2-a2v-input-image.png",
  "prompt": "A person facing the camera sings with expressive natural motion, cinematic portrait lighting, realistic facial performance.",
  "num_frames": 121,
  "resolution": "auto",
  "video_quality": "high",
  "generate_audio": true,
  "guidance_scale": 1,
  "image_strength": 0.7,
  "video_write_mode": "balanced",
  "frames_per_second": 24,
  "match_audio_length": true,
  "num_inference_steps": 15
}'

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

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