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Video Sound Effects Review: Ambience From the Picture Alone

Pick Video Sound Effects to add ambience and effects to a silent clip cheaply; it won't write dialogue or a music track, so plan for that separately.

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Spicy Index

Not indexed

Freedom Score

52.0/ 100

Range if the rest pass: 52.0–100.0

Content levels

Tested 3 of 6 probe types · 13 runs

  • Mild · The lightest prompts in the test

  • Moderate · Where filtered models start to refuse

  • Strong · Mid-scale; must be tested before a model is ranked

  • Very strong · Where most models start to hold back

  • Maximum · The top of the scale, scored in two halves: class A and class B

Price
—
Median time
56 s
Success rate
Collecting data

Video Sound Effects watches video_url and generates a soundtrack that follows the action on screen, then returns the same clip with that track as its audio. prompt steers what you hear; negative_prompt keeps specific sounds out. duration_seconds (1 to 30, default 8) sets how much sound is generated and how much of the clip comes back — and you're billed for the seconds you request even if the source clip is shorter. It costs $0.0012 per second, so a full 30-second pass is $0.036.

The verdict

It's built for effects and ambience, not dialogue or music, and we haven't yet run content-ladder probes on this endpoint.

Try Video Sound Effects →

Key facts

  • Content ladder: not tested yet on this endpoint.
  • Scoring: see the score card on this page for whatever run data we've added.
  • Price: $0.0012 per second of duration_seconds requested.
  • Limits: duration_seconds from 1 to 30, default 8; billed for the seconds requested even if the clip is shorter; not built for dialogue or music.
  • Sources: the scoring rules are on our review methodology page, and the full parameter list is on the Video Sound Effects model page.

What we liked and what held it back

What we liked

  • The prompt and negative prompt give you real control over what you hear. Naming the sounds you want ("subway train rumbling on the rails, soft electric hum, distant brakes" in the published example) steers the result rather than leaving it entirely to what the picture implies.
  • It's very cheap per second. At $0.0012 a second, generating sound for a 30-second clip costs $0.036 — inexpensive enough to try a few prompt variations before settling on one.
  • duration_seconds doubles as the trim. Set it to your clip's actual length and the returned video is cut to match, so there's no separate step to sync the audio track's length to the picture.
  • It attaches directly to the clip. The output is the same video with the generated track as its audio, not a separate audio file you have to mux yourself.
  • Effects and ambience, not a vague wash of noise. The published example names three distinct layered sounds — a rumble, a hum and a distant brake — rather than one generic sound bed.

What held it back

  • It isn't for dialogue or music. The endpoint description is explicit: it makes effects and ambience, not speech or a score. Reach for a different tool if that's what you need.
  • You're billed for the seconds you request, not the seconds actually used. Set duration_seconds shorter than your clip and you'll get less generated audio than the picture runs; set it too generous and you pay for seconds you didn't need.
  • A 30-second ceiling per call. Longer footage needs to be split into multiple calls.
  • No content-ladder data yet. We can't say whether or how it handles requests tied to non-SFW footage until we test it; treat that as untested, not assumed either way.
  • guidance_scale and steps are there to tune, but we have no comparative data on what changes when you move them. We haven't run the side-by-side tests that would tell you when adjusting them is worth it.

What we tested

We haven't run content-ladder probes on Video Sound Effects yet, so this section reports what we can verify from the schema and the one published example rather than scored runs. The example takes a five-second night-train shot, sets duration_seconds to match the clip's length, and prompts for train sounds, an electric hum and distant brakes — three named layers rather than one generic ambience.

Prompts that worked

Name the distinct sounds you want, not just a mood — the published example lists three separate elements rather than a single description.

1. A published example: name each sound layer.

text
subway train rumbling on the rails, soft electric hum, distant brakes

Run this on Video Sound Effects →

Settings that matter: set duration_seconds to your clip's actual length rather than leaving the default 8, since the returned video is cut to that number and you're billed for it regardless of the source clip's length; use negative_prompt to rule out a specific sound the picture might otherwise suggest.

Alternatives

  • Need speech synced to a face instead of ambience? Lip Sync redraws the mouth on existing footage to match a new audio track, at $0.012 per second.
  • Starting from a still portrait and a voice recording? Talking Avatar animates a photo to speak your audio, at $0.018 per second.

How far Video Sound Effects goes

Each level, on each task, based on confirmed results. A level earns points only when the content actually appears, and a single run earns 60% at most.

Freedom points by level and task
LevelAdd sound to video
MildThe lightest prompts in the test
1/1 delivered12.0 / 20 pts
ModerateWhere filtered models start to refuse
5/5 delivered20.0 / 20 pts
StrongMid-scale; must be tested before a model is ranked
7/7 delivered20.0 / 20 pts
Very strongWhere most models start to hold backNot tested yet
MaximumThe top of the scale, scored in two halves: class A and class BNot tested yet
Task score52.0 / 100.0Tested Oct 5, 2026

Tested Sep 26, 2026 to Oct 5, 2026

This site stays safe for work: results are written up as text, any image shown is pixel-censored, and test prompts are never published. We never test anyone who looks underage, real people’s likenesses or non-consent.

See every test record →See the uncensored leaderboard →

Run your own prompt and see how far it goes

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How Video Sound Effects earns its Spicy Index

Each dimension below links to its full workings: the table row every point came from and why points were lost.

Public leaderboards 45% of quality
Not yet tested

No exact match on a tracked public leaderboard yet. How it works

Blind output test 35% of quality
Not yet tested

Not in our blind output test yet. How it works

Arena quality 20% of quality
Not yet tested

Counts once the model has 100+ blind votes and a 95% interval under 200 Elo. How it works

Capability 10.5% weight
Not yet tested

Not scored yet. How it works

Freedom Score 30% weight
52.0
Open the full test report →

What Video Sound Effects can do on SpicyAPI

Straight from the live model specification on SpicyAPI. Some creators offer more in their own apps; this is what you can call through our API today.

Capabilities by endpoint
FeatureAdd sound to video
Clip length1–30 s
Native audioNo
Seed controlNo
Negative promptYes
See every parameter and code sample →

How long it really takes

Measured on real jobs over the last 30 days, from request to finished result. Times include our own test runs.

Median time
56 s
90th percentile
3.3 min
Wait per second of video
Collecting data
Success rate
Collecting data

A time appears once at least 10 completed jobs are in. Success rates count customer jobs only and stay hidden for every model until we have a full 30 days of traffic.

Models to consider instead of Video Sound Effects

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Video Sound Effects FAQ

Try Video Sound Effects yourself

Set every parameter in the Playground and see the exact price before you run it.

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