Registry indexed
Generate sound effects matched to a video using Sonilo — footsteps, impacts, ambience, foley — optionally scripted to specific timed segments, returning either the audio or a new video with the SFX muxed in. Use when the user has footage that needs sound design. For SFX from a te
Generate sound effects matched to a video using Sonilo — footsteps, impacts, ambience, foley — optionally scripted to specific timed segments, returning either the audio or a new video with the SFX muxed in. Use when the user has footage that needs sound design. For SFX from a text description alone, use the text-to-sfx skill; for music, use video-to-music.
Source documentation, not instructions for this website. Review permissions before running any commands.
Hand Sonilo a video and it generates sound effects matching what it sees —
footsteps, impacts, ambience, UI sounds, whatever the scene calls for — or pin
specific sounds to specific moments with segments. Generation runs as an async
task on the backend; the tools poll internally and hand back the saved file.
Setup: See the setup-api-key skill.
⚠️ Cost: every tool below makes an API call that may incur charges. Only call it when explicitly requested.
Pick one at the start of the session and stay on it. Do not mix the two inside a single job, and do not announce the choice.
video_to_sfx and friends) — use them. This is the preferred path: it needs no shell, and it is the only one that survives a very long generation. If a call fails to authenticate — rather than failing on its inputs — this transport is not usable in this session: go to 2 instead of retrying it.sonilo account exits 0 — use the CLI commands below. Same API, same account, same credential file. Probe with sonilo account, not sonilo whoami: whoami exits 0 even when signed out, so it cannot tell the two states apart.api.sonilo.com with curl to work around it; both transports handle uploads, polling and retries that a bare request does not.video_to_sfx(
video_path="~/Desktop/action-scene.mp4",
prompt="Footsteps on gravel, distant traffic, a door slam"
)
pip install sonilo)from sonilo import Sonilo
client = Sonilo() # reads SONILO_API_KEY
foley = client.video_to_sfx.generate(video="action-scene.mp4", prompt="Footsteps on gravel, distant traffic, a door slam")
foley.save("foley.wav")
# video_to_video_sfx: get the video back with the effects muxed in
video = client.video_to_video_sfx.generate(video="action-scene.mp4", segments=[{"start": 0, "end": 2, "prompt": "footsteps on gravel"}])
video.save("with_sfx.mp4")
npm install sonilo)import { SoniloClient } from "sonilo";
const client = new SoniloClient(); // reads SONILO_API_KEY
const foley = await client.videoToSfx.generate({
video: "./action-scene.mp4",
prompt: "Footsteps on gravel, distant traffic, a door slam",
});
// video_to_video_sfx: get the video back with the effects muxed in
const video = await client.videoToVideoSfx.generate({
video: "./action-scene.mp4",
segments: [{ start: 0, end: 2, prompt: "footsteps on gravel" }],
});
npm install -g sonilo-cli or pip install sonilo-cli)sonilo video-to-sfx --video action-scene.mp4 --output foley.wav
Always async under the hood — the CLI submits and polls for you. --format accepts wav|mp3|aac|flac.
# the muxed video, from the CLI
sonilo video-to-video-sfx --video clip.mp4 --prompt "footsteps, distant thunder" --output foley.mp4
curl -X POST "https://api.sonilo.com/v1/video-to-sfx" \
-H "Authorization: Bearer $SONILO_API_KEY" \
-F "video=@action-scene.mp4" \
-F "prompt=Footsteps on gravel, distant traffic, a door slam"
# -> {"task_id": "..."} poll GET /v1/tasks/{task_id} until status is succeeded/failed
Every call is task-based: the endpoint returns {"task_id": ...} (HTTP 202), and the result is fetched from GET /v1/tasks/{task_id} once status is terminal. The MCP tools do this polling for you and return the saved path directly — you only see the task_id if the call times out (see task-recovery).
| Tool | Description |
|---|---|
video_to_sfx(video_path? | video_url?, prompt?, segments?, audio_format?, output_directory?) | Generate SFX matched to a video. Returns audio only (not the source video). |
video_to_video_sfx(video_path? | video_url?, prompt?, segments?, output_directory?) | Same, but returns a new .mp4 with the SFX muxed in. |
| Parameter | Type | Default | Notes |
|---|---|---|---|
prompt | string | — | Optional overall description (max 2000 chars) — omit it to let Sonilo interpret the video on its own. |
video_path | string | — | .mp4/.mov/.webm/.m4v/.gif (gif must be animated) — a narrower set than the music tools. Max 180s (3 min), subject to the account's upload-size cap. |
video_url | string | — | HTTPS/HTTP URL to a video. Exactly one of video_path/video_url. |
segments | list[dict] | — | Script SFX to specific time ranges: [{"start": float, "end": float, "prompt": str}, ...]. See rules below. Max 30 segments. |
audio_format | string | aac (.m4a) | wav, mp3, aac, or flac. video_to_sfx only (video-to-video always outputs .mp4). |
output_directory | string | SONILO_MCP_BASE_PATH | Absolute, or relative to the base path. |
segments rulesValidated by the backend before any charge — an invalid list is rejected with a 422/400 and nothing is billed:
start must be 0.end must equal the next segment's start.end must be greater than its start.prompt must be non-empty, max 200 chars.end must not exceed the video's actual duration.No prompt is required — the model reads the cut. Quality comes from a time-segmented action map: what is on screen, what it's made of, what it does, second by second. The footage is the source of truth.
Before a paid call: probe the exact duration and existing audio, respect the 180 s cap (over = 422 reject, never truncated), and get sign-off — failed runs auto-refund, but your own retry is a new charge.
prompt/segments unset to let Sonilo read the whole video and decide; use segments when you need specific sounds pinned to specific moments (e.g. a punch landing at 2.3s, a door slam at 5.0s).video_to_video_sfx instead of video_to_sfx.Every tool here is async on the backend already; a long generation can still exceed TIME_OUT_SECONDS. If it does, the error carries a task_id — the job keeps running (and is already charged). Call get_sfx_task(task_id) — get_generation_task(task_id) on the hosted server — later to retrieve the result; see task-recovery.
video_to_sfx: saved in the requested audio_format (.wav/.mp3/.flac, or .m4a for the aac default), named from the prompt (slugified) or sfx-<first 8 chars of the task id>.video_to_video_sfx: a single .mp4 with the SFX muxed in.Common errors: 401 invalid key, 402 insufficient balance / trial exhausted, 413 file too large, 422 invalid parameters or malformed segments, 429 rate limit. See the account skill.
name: video-to-sfx description: Generate sound effects matched to a video using Sonilo — footsteps, impacts, ambience, foley — optionally scripted to specific timed segments, returning either the audio or a new video with the SFX muxed in. Use when the user has footage that needs sound design. For SFX from a text description alone, use the text-to-sfx skill; for music, use video-to-music. license: MIT compatibility: "Requires Sonilo through either transport — the MCP server connected, or the `sonilo` CLI installed and signed in — plus credentials: a `sonilo login` sign-in, the hosted OAuth plugin, or SONILO_API_KEY. See the setup-api-key skill." allowed-tools: Bash, Read, Write, mcp__sonilo__*
---
name: video-to-sfx
description: Generate sound effects matched to a video using Sonilo — footsteps, impacts, ambience, foley — optionally scripted to specific timed segments, returning either the audio or a new video with the SFX muxed in. Use when the user has footage that needs sound design. For SFX from a text description alone, use the text-to-sfx skill; for music, use video-to-music.
license: MIT
compatibility: "Requires Sonilo through either transport — the MCP server connected, or the `sonilo` CLI installed and signed in — plus credentials: a `sonilo login` sign-in, the hosted OAuth plugin, or SONILO_API_KEY. See the setup-api-key skill."
allowed-tools: Bash, Read, Write, mcp__sonilo__*
---
# Sonilo Video-to-SFX
Hand Sonilo a video and it generates sound effects matching what it sees —
footsteps, impacts, ambience, UI sounds, whatever the scene calls for — or pin
specific sounds to specific moments with `segments`. Generation runs as an async
task on the backend; the tools poll internally and hand back the saved file.
> **Setup:** See the [setup-api-key](../setup-api-key) skill.
> ⚠️ **Cost:** every tool below makes an API call that may incur charges. Only call it when explicitly requested.
## Transport: MCP or CLI
Pick one at the start of the session and stay on it. Do not mix the two inside
a single job, and do not announce the choice.
1. **Sonilo MCP tools visible in this session** (`video_to_sfx` and friends) — use them. This is the preferred path: it needs no shell, and it is the only one that survives a very long generation. If a call fails to authenticate — rather than failing on its inputs — this transport is not usable in this session: go to 2 instead of retrying it.
2. **No usable Sonilo MCP tools, but `sonilo account` exits 0** — use the CLI commands below. Same API, same account, same credential file. Probe with `sonilo account`, not `sonilo whoami`: whoami exits 0 even when signed out, so it cannot tell the two states apart.
3. **Neither** — stop and run the [setup-api-key](../setup-api-key) skill. Do not call `api.sonilo.com` with curl to work around it; both transports handle uploads, polling and retries that a bare request does not.
## Quick Start
### MCP tool call (recommended)
```
video_to_sfx(
video_path="~/Desktop/action-scene.mp4",
prompt="Footsteps on gravel, distant traffic, a door slam"
)
```
### Python (`pip install sonilo`)
```python
from sonilo import Sonilo
client = Sonilo() # reads SONILO_API_KEY
foley = client.video_to_sfx.generate(video="action-scene.mp4", prompt="Footsteps on gravel, distant traffic, a door slam")
foley.save("foley.wav")
# video_to_video_sfx: get the video back with the effects muxed in
video = client.video_to_video_sfx.generate(video="action-scene.mp4", segments=[{"start": 0, "end": 2, "prompt": "footsteps on gravel"}])
video.save("with_sfx.mp4")
```
### JavaScript / TypeScript (`npm install sonilo`)
```ts
import { SoniloClient } from "sonilo";
const client = new SoniloClient(); // reads SONILO_API_KEY
const foley = await client.videoToSfx.generate({
video: "./action-scene.mp4",
prompt: "Footsteps on gravel, distant traffic, a door slam",
});
// video_to_video_sfx: get the video back with the effects muxed in
const video = await client.videoToVideoSfx.generate({
video: "./action-scene.mp4",
segments: [{ start: 0, end: 2, prompt: "footsteps on gravel" }],
});
```
### CLI (`npm install -g sonilo-cli` or `pip install sonilo-cli`)
```bash
sonilo video-to-sfx --video action-scene.mp4 --output foley.wav
```
Always async under the hood — the CLI submits and polls for you. `--format` accepts `wav|mp3|aac|flac`.
```bash
# the muxed video, from the CLI
sonilo video-to-video-sfx --video clip.mp4 --prompt "footsteps, distant thunder" --output foley.mp4
```
### cURL (raw REST API, no MCP host)
```bash
curl -X POST "https://api.sonilo.com/v1/video-to-sfx" \
-H "Authorization: Bearer $SONILO_API_KEY" \
-F "video=@action-scene.mp4" \
-F "prompt=Footsteps on gravel, distant traffic, a door slam"
# -> {"task_id": "..."} poll GET /v1/tasks/{task_id} until status is succeeded/failed
```
Every call is task-based: the endpoint returns `{"task_id": ...}` (HTTP 202), and the result is fetched from `GET /v1/tasks/{task_id}` once `status` is terminal. The MCP tools do this polling for you and return the saved path directly — you only see the `task_id` if the call times out (see [task-recovery](../task-recovery)).
## Tools
| Tool | Description |
|------|-------------|
| `video_to_sfx(video_path? \| video_url?, prompt?, segments?, audio_format?, output_directory?)` | Generate SFX matched to a video. Returns **audio only** (not the source video). |
| `video_to_video_sfx(video_path? \| video_url?, prompt?, segments?, output_directory?)` | Same, but returns a **new `.mp4`** with the SFX muxed in. |
## Parameters
| Parameter | Type | Default | Notes |
|-----------|------|---------|-------|
| `prompt` | string | — | Optional overall description (max 2000 chars) — omit it to let Sonilo interpret the video on its own. |
| `video_path` | string | — | `.mp4/.mov/.webm/.m4v/.gif` (gif must be animated) — a narrower set than the music tools. Max **180s (3 min)**, subject to the account's upload-size cap. |
| `video_url` | string | — | HTTPS/HTTP URL to a video. Exactly one of `video_path`/`video_url`. |
| `segments` | list[dict] | — | Script SFX to specific time ranges: `[{"start": float, "end": float, "prompt": str}, ...]`. See rules below. Max 30 segments. |
| `audio_format` | string | `aac` (`.m4a`) | `wav`, `mp3`, `aac`, or `flac`. `video_to_sfx` only (video-to-video always outputs `.mp4`). |
| `output_directory` | string | `SONILO_MCP_BASE_PATH` | Absolute, or relative to the base path. |
### `segments` rules
Validated by the backend before any charge — an invalid list is rejected with a 422/400 and nothing is billed:
- First segment's `start` must be `0`.
- Segments must be contiguous: each `end` must equal the next segment's `start`.
- Every `end` must be greater than its `start`.
- Every `prompt` must be non-empty, max 200 chars.
- The last `end` must not exceed the video's actual duration.
- Max 30 segments total.
## Prompting
No prompt is required — the model reads the cut. Quality comes from a
time-segmented action map: what is on screen, what it's made of, what it does,
second by second. The footage is the source of truth.
Before a paid call: probe the exact duration and existing audio, respect the
**180 s** cap (over = 422 reject, never truncated), and get sign-off — failed
runs auto-refund, but your own retry is a new charge.
- Full pre-flight (inspect the video, caps, credits, verification): [references/preflight.md](../references/preflight.md)
- Action-map craft (scene bed, sound bundles, materials vocabulary, segment rules): [references/sfx-prompting.md](../references/sfx-prompting.md)
## Workflow Tips
- **Leave `prompt`/`segments` unset** to let Sonilo read the whole video and decide; use `segments` when you need specific sounds pinned to specific moments (e.g. a punch landing at 2.3s, a door slam at 5.0s).
- **Want the video back with SFX baked in?** Use `video_to_video_sfx` instead of `video_to_sfx`.
- **Prompting:** be specific and combine elements — "Heavy rain on a tin roof" beats "Rain".
- **Don't confuse this with music.** For a background score or soundtrack, use [video-to-music](../video-to-music) instead. To generate both music and SFX together in one balanced, single-charge call, use [video-to-sound](../video-to-sound).
- **No footage?** [text-to-sfx](../text-to-sfx) generates a single clip from a description alone.
- **Don't know what it should sound like?** Run [video-analysis](../video-analysis) first: one call returns a section plan plus ready-to-use generation prompts read off the footage, which beats guessing a prompt and rerolling. It is a paid call that generates nothing, so use it when the brief is genuinely unclear — not when the user already told you what they want.
## Recovering a Timed-Out Call
Every tool here is async on the backend already; a long generation can still exceed `TIME_OUT_SECONDS`. If it does, the error carries a `task_id` — the job keeps running (and is already charged). Call `get_sfx_task(task_id)` — `get_generation_task(task_id)` on the hosted server — later to retrieve the result; see [task-recovery](../task-recovery).
## Output Files
- `video_to_sfx`: saved in the requested `audio_format` (`.wav`/`.mp3`/`.flac`, or `.m4a` for the `aac` default), named from the prompt (slugified) or `sfx-<first 8 chars of the task id>`.
- `video_to_video_sfx`: a single `.mp4` with the SFX muxed in.
## Error Handling
Common errors: `401` invalid key, `402` insufficient balance / trial exhausted, `413` file too large, `422` invalid parameters or malformed `segments`, `429` rate limit. See the [account](../account) skill.
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
67/100
Promising
Trust
57/100
Do not auto-install
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 67,
"label": "Promising"
},
"supply": {
"track": "Research and knowledge work",
"scenario": "Research agents",
"maintenance": "12d since push",
"risk": "Needs review"
},
"alternative_skills": [
{
"slug": "yanliudesign-mono-color-skill",
"name": "mono-color",
"url": "https://www.openagentskill.com/skills/yanliudesign-mono-color-skill",
"stars": 1919,
"install_command": "npx skills add yanliudesign/mono-color-skill --skill mono-color",
"trust_score": 85,
"audit_score": 93
}
],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"The SKILL.md excerpt is truncated, but the provided content is sufficient for evaluation.",
"No OpenAgentSkill engagement data yet",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"The skill requires external API credentials and incurs costs; this is clearly disclosed and not a security risk."
],
"agent_contract": {
"task_input": "Use video-to-sfx in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 65/100 Manual review",
"Audit: 74/100 Needs review",
"Safety: 34/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "sonilo-ai-video-to-sfx (video-to-sfx)",
"install_command": "npx skills add sonilo-ai/skills --skill video-to-sfx",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "sonilo-ai-video-to-sfx",
"task": "Use video-to-sfx in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/sonilo-ai-video-to-sfx",
"api": "https://www.openagentskill.com/api/agent/skills/sonilo-ai-video-to-sfx",
"audit": "https://www.openagentskill.com/skills/sonilo-ai-video-to-sfx/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=sonilo-ai-video-to-sfx&task=Use%20video-to-sfx%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20video-to-sfx%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20video-to-sfx%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/sonilo-ai-video-to-sfx/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/sonilo-ai-video-to-sfx"
}
}Listing source
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Audit
74/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.