Video to Audio API — Generate Sound for Silent Video
Live2 modelsMuapi's video-to-audio API analyzes a silent video and generates a matching ambient track, foley, or sound effect synchronized to the on-screen action — no manual sound design required. The same MMAudio model family also supports generating a standalone sound effect from a text prompt alone. Both exposed through the same unified REST endpoint, billed at $0.001 per second of output audio.
MMAudio Video to Audio
Analyzes a silent video and generates a matching ambient track, foley, or sound effect synchronized to the on-screen action — describe the sound you want with a text prompt.
MMAudio Text to Audio
Generates a standalone sound effect or ambient audio clip from a text prompt alone — no video input required. Useful for building a sound library independent of any footage.
What is a Video to Audio API?
A video-to-audio API takes a silent video clip and generates a soundtrack that matches what's happening on screen — footsteps, wind, machinery, ambience — driven by a text prompt describing the sound you want, rather than a manual foley or sound-design pass.
Muapi exposes MMAudio Video to Audio for that exact workflow, plus MMAudio Text to Audio for generating a standalone sound effect or ambient clip with no video input at all. Both run through the same submit-and-poll REST pattern used across every model on the platform, billed per second of generated audio.
Key Capabilities
Video-Synchronized Sound Generation
MMAudio Video to Audio watches the input video and generates audio timed to the visible action, guided by your text prompt describing the desired sound.
Standalone Sound Effects
MMAudio Text to Audio generates a sound effect or ambience clip from text alone, useful for building a reusable sound library independent of any specific footage.
Adjustable Output Duration
Both models accept a duration parameter (default 8 seconds) so the generated audio clip matches your video length or desired clip length.
Silent-Clip Pipeline
Ideal for AI-generated video clips that come out silent — feed the clip straight into MMAudio Video to Audio to add a matching soundtrack in one API call.
Lowest Cost Per Second on the Platform
Both MMAudio models bill at $0.001 per second of output audio — a full 8-second default clip costs $0.008.
Pairs with Muapi's Other Audio Tools
Combine with Text to Speech for dialogue or Suno for music, then layer in MMAudio-generated ambience or effects for a fully-scored video.
Video to Audio Model Comparison
| Model | Input | Price | Best For |
|---|---|---|---|
| MMAudio Video to Audio | Video + text prompt | $0.001 / sec ($0.008 for 8s default) | Adding a synchronized soundtrack to a silent video clip |
| MMAudio Text to Audio | Text prompt only | $0.001 / sec ($0.008 for 8s default) | Standalone sound effects and ambience, no video required |
How to Generate Audio for Video via API
- Pick a model — video-to-audio if you have a silent clip to score, text-to-audio for a standalone sound effect.
- Write a prompt — describe the sound you want, e.g. "heavy rain on a tin roof with distant thunder."
- Submit the request —
POST /api/v1/{model-slug}with your prompt, video URL (video-to-audio only), and optional duration. - Poll for completion — check
GET /api/v1/predictions/{request_id}/resultuntilstatusiscompleted, then download the audio. - Mux into your video — combine the generated audio track with your original silent clip in your editing pipeline.
Frequently Asked Questions
What is the Video to Audio API?
Muapi's video-to-audio API analyzes a silent video and generates a matching soundtrack via MMAudio Video to Audio, guided by a text prompt describing the desired sound.
Can I generate a sound effect without a video?
Yes — MMAudio Text to Audio generates a standalone sound effect or ambient clip from a text prompt alone, no video input required.
How much does video-to-audio generation cost?
Both MMAudio models cost $0.001 per second of generated audio — an 8-second clip (the default duration) costs $0.008.
How long can the generated audio be?
Duration is a request parameter, defaulting to 8 seconds. Set it to match your video length or desired clip length.
Does this generate speech or dialogue?
No — MMAudio is built for ambience, foley, and sound effects. For speech and dialogue, use Muapi's Text to Speech API instead.
Can I get Video to Audio API access right now?
Yes. Sign up at muapi.ai, create an API key from your dashboard, and start generating audio immediately — no waitlist required.