Sonilo V1 Video To Video Sound

Sonilo V1 Video To Video Sound

Playground

Sonilo Video to Video Sound adds generated music and sound effects to input videos, creating one or more videos with new audio tracks for video sound design, soundtrack generation, ads, social content, and creative production workflows. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Sonilo Video-to-Video Sound creates a complete video soundtrack from generated music and sound effects, then returns an MP4 video with the new audio track. Upload a video, describe the desired music and sound effects, optionally define time-aligned SFX segments, and generate a finished video with synchronized audio.

Why Choose This?

• Video-to-video soundtrack generation
  Generate music and sound effects for an input video, then package them into a final MP4 output.

• Music and SFX control
  Use music_prompt for the generated music direction and sfx_prompt for the overall sound-effect style.

• Time-aligned sound segments
  Use segments to define sound effects for specific moments in the video.

• Speech preservation option
  Enable preserve_speech when the original speech from the input video should remain.

• Audio ducking support
  Use ducking to lower generated music and sound effects while speech is present.

• Standard video output
  The final MP4 video is returned as a URL in the standard WaveSpeed prediction response.

Parameters

Segments

Use segments when specific parts of the video need different sound effects.

Each segment contains:

The first segment must start at 0. Adjacent segments must be continuous without gaps or overlap, and the final segment cannot exceed the source video duration.

How to Use

1. Upload your video — Provide the input video that needs a generated soundtrack.
2. Add music prompt optional — Describe the desired music style, mood, genre, tempo, or instrumentation.
3. Add SFX prompt optional — Describe the overall sound-effect style, ambience, realism, or intensity.
4. Add segments — Define time-aligned sound-effect prompts for specific moments in the video.
5. Configure speech handling optional — Enable preserve_speech if the original speech should remain.
6. Configure ducking optional — Use ducking to reduce generated audio while speech is present.
7. Submit — Generate the final MP4 video with the new audio track.

Pricing

Pricing is $0.018 per second of input video duration. Billing duration is rounded up to the next whole second and capped at 180 seconds.

Best Use Cases

• Full video soundtracks — Generate music and sound effects together for a complete video output.
• Social video production — Add synchronized audio to reels, shorts, ads, and campaign videos.
• Cinematic sound design — Create music, ambience, and action-based sound effects for visual scenes.
• Speech-aware soundtrack generation — Preserve original speech while adding generated background music and effects.
• Segment-based SFX control — Assign different sound effects to different moments in the video.
• Creative prototyping — Test music and sound design directions before final audio production.

Pro Tips

• Use music_prompt to describe genre, mood, tempo, instruments, and production style.
• Use sfx_prompt to describe the overall ambience, realism, intensity, or sound palette.
• Use segments when different moments need different sound effects.
• Keep segment prompts short, concrete, and tied to visible action.
• Enable preserve_speech when the input video contains important dialogue or narration.
• Use ducking when generated music and sound effects should sit behind speech.
• Keep the input video within 180 seconds and 300 MB.

## Authentication

For authentication details, please refer to the [Authentication Guide](/api-authentication).

## API Endpoints

### Submit Task & Query Result

<ApiTabs submitUrl={model.submitUrl} resultUrl={model.resultUrl} payload={model.defaultValues} />

## Parameters

### Task Submission Parameters

#### Request Parameters

<RequestParams params={model.params} />

#### Response Parameters

<SubmitResponse />

#### Result Request Parameters

| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| id | string | Yes | - | Task ID |

#### Result Response Parameters

| Parameter | Type | Description |
|-----------|------|-------------|
| code | integer | HTTP status code (e.g., 200 for success) |
| message | string | Status message (e.g., "success") |
| data | object | The prediction data object containing all details |
| data.id | string | Unique identifier for the prediction |
| data.model | string | Model ID used for the prediction |
| data.outputs | array&lt;string \| object&gt; | Array of generated outputs (empty when status is not completed). Items are usually URL strings, but may be text strings or structured result objects, depending on the model. |
| data.urls | object | Object containing related API endpoints |
| data.urls.get | string | URL to poll for the prediction result |
| data.status | string | Status: `created`, `processing`, `completed`, or `failed` |
| data.created_at | string | ISO timestamp of when the request was created |
| data.error | string | Error message (empty if no error occurred) |
| data.timings | object | Object containing timing details |
| data.timings.inference | integer | Inference time in milliseconds |