Sfx V1 Video to Audio | AI Video-to-Audio API

Mirelo SFX V1 Video-to-Audio

Mirelo SFX V1 Video-to-Audio generates synchronized sound effects directly from video input, with optional text prompt guidance to steer the audio content. Upload a video, describe the sound you want, and get realistic, scene-matched audio output — multiple samples per run for easy A/B selection.

Why Choose This?

Video-synchronized sound effects Analyzes video content and generates audio that matches the on-screen action, environment, and pacing.
Text prompt guidance Optionally describe the desired sound to steer the output — useful for ambiguous scenes or specific audio requirements.
Multiple sample generation Generate several audio variations in one run and pick the best result without re-submitting.
Adjustable duration Control how many seconds of audio to generate, up to 10 seconds per run.
Reproducible results Use the seed parameter to lock in a specific output for exact reproduction.

Parameters

Parameter	Required	Description
video	Yes	Input video to generate sound effects for (URL or file upload).
prompt	No	Text description to guide the style or content of the generated audio.
num_samples	No	Number of audio variations to generate per run. Default: 2.
duration	No	Length of audio to generate in seconds. Range: 2–10. Default: 5.
seed	No	Random seed for reproducible results. Use -1 for a random seed.

How to Use

Upload your video — provide the clip you want to generate sound for via URL or drag-and-drop.
Write a prompt (optional) — describe the type of sound or atmosphere you want. Use the Prompt Enhancer for better results.
Set num_samples — choose how many audio variations to generate in one run.
Set duration — choose how many seconds of audio to generate (2–10 seconds).
Set seed (optional) — fix the seed to reproduce a specific result, or leave at -1 for random.
Submit — generate and download your synchronized audio.

Pricing

Billed at $0.007 per second per sample, with a minimum billable duration of 2 seconds and a maximum of 10 seconds.

Duration	1 Sample	2 Samples	4 Samples
2s	$0.014	$0.028	$0.056
5s	$0.035	$0.070	$0.140
10s	$0.070	$0.140	$0.280

Billing Rules

Rate: $0.007 per second per sample
Minimum billable duration: 2 seconds
Maximum billable duration: 10 seconds
Total cost = billed duration × num_samples × $0.007

Best Use Cases

Film & Video Post-Production — Add realistic ambient sound, foley, and environmental audio to silent or poorly recorded footage.
Social Media Content — Enhance short-form videos with matching sound effects for higher engagement.
Game & Interactive Media — Generate contextual sound effects from in-game or recorded footage.
Advertising — Quickly produce polished audio for product videos and promotional clips.
Content Automation — Batch-generate synchronized audio for high-volume video workflows via the REST API.

Pro Tips

Leave the prompt empty to let the model infer audio purely from the video content.
Use the prompt to override or refine the default interpretation — for example, specifying "rain on window glass" for an ambiguous indoor scene.
Generate 3–4 samples per run to maximize variation and increase the chance of a perfect match.
Fix the seed once you find a result you like to reproduce it exactly in future runs.
Match duration to the key action window in your video for the most focused and accurate audio.

Notes

video is the only required field; all other parameters are optional.
Billable duration is clamped between 2 and 10 seconds regardless of actual video length.
Ensure video URLs are publicly accessible if using a link rather than a direct upload.

Related Models

Hunyuan Video Foley — Generate foley-style synchronized audio from video using Hunyuan's audio model.
Mirelo SFX V1.5 Video-to-Audio — Next-generation SFX model with improved audio quality and synchronization.

Sfx v1 Video To Audio API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/mirelo-ai/sfx-v1/video-to-audio with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Sfx v1 Video To Audio below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/mirelo-ai/sfx-v1/video-to-audio" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "video": "https://example.com/your-input.mp4",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "num_samples": 2,
    "duration": 5,
    "seed": -1
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("mirelo-ai/sfx-v1/video-to-audio", {
        "video": "https://example.com/your-input.mp4",
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "num_samples": 2,
        "duration": 5,
        "seed": -1
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "mirelo-ai/sfx-v1/video-to-audio",
    {
    "video": "https://example.com/your-input.mp4",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "num_samples": 2,
    "duration": 5,
    "seed": -1
}
)

print(output["outputs"][0])  # → URL of the generated output

Sfx v1 Video To Audio API — Frequently asked questions

What is the Sfx v1 Video To Audio API?

Sfx v1 Video To Audio is a Mirelo Ai model for AI inference, exposed as a REST API on WaveSpeedAI. Mirelo SFX V1 Video-to-Audio generates synchronized sound effects from video input with text prompt guidance. Supports multiple sample generation and customizable duration. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Sfx v1 Video To Audio API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/mirelo-ai/mirelo-ai-sfx-v1-video-to-audio.

How much does Sfx v1 Video To Audio cost per run?

Sfx v1 Video To Audio starts at $0.007 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Sfx v1 Video To Audio accept?

Key inputs: `prompt`, `video`, `duration`, `seed`, `num_samples`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/mirelo-ai/mirelo-ai-sfx-v1-video-to-audio.

How do I get started with the Sfx v1 Video To Audio API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Sfx v1 Video To Audio outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (Mirelo Ai). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

ExamplesView all

Related Models

README

Mirelo SFX V1 Video-to-Audio

Why Choose This?

Parameters

How to Use

Pricing

Billing Rules

Best Use Cases

Pro Tips

Notes

Related Models

Sfx v1 Video To Audio API — Quick start

Sfx v1 Video To Audio API — Frequently asked questions