MMAudioMediumHigh

MMAudio

Add AI-generated sound to any video (5M+ runs) — synthesizes synchronized audio (ambience, effects, foley) from the video content and an optional text prompt. The perfect finisher for silent AI-generated clips.

11 credits

per generation

Video-synchronized audio synthesis

Optional prompt to steer the sound

Negative prompt (default excludes music)

Also works from a still image + duration

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.txtllms.txt ↗

Quick Start

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "zsxkib/mmaudio",
  "input": {
    "video": "https://example.com/generated-clip.mp4",
    "prompt": "ocean waves, seagulls, gentle wind"
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	No	-	Describe the sound you want (e.g. 'rain on leaves, distant thunder')
`negative_prompt`	string	No	music	Sounds to avoid (default avoids music)
`video`	string	No	-	Video to add sound to
`duration`	number	No	8	Audio duration in seconds
`num_steps`	integer	No	25	Number of inference steps
`cfg_strength`	number	No	4.5	Guidance strength (CFG)
`seed`	integer	No	-	Random seed (-1 for random)
`image`	string	No	-	Optional image file for image-to-audio generation (experimental)

How to Provide File Input

There are 3 ways to provide files for the video parameter:

Recommended

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step needed.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=zsxkib/mmaudio" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:video=@your_file.png"

Image URL

Pass a publicly accessible URL directly. You can also use file_url from the Storage API.

{
  "model": "zsxkib/mmaudio",
  "input": {
    "prompt": "your prompt here",
    "video": "https://example.com/image.jpg"
  }
}

See the File Upload docs for more upload methods including Presigned URLs.

Common Parameters

Common parameters used when calling POST /v1/predictions.

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model identifier
`input`	object	Yes	-	Object containing the model-specific parameters from the table above
`output_folder`	string	No	-	Folder path for output files (max 256 chars, '..' not allowed)
`webhook_url`	string	No	-	Webhook URL to call on completion
`is_public`	boolean	No	false	If true, output files are also available via permanent public URLs

Examples

Sound for an AI Clip

Add synchronized ambience to a generated video

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "zsxkib/mmaudio",
  "input": {
    "video": "https://example.com/generated-clip.mp4",
    "prompt": "ocean waves, seagulls, gentle wind"
  }
}'