Hunyuan Video Foley Review: AI Foley Sound for Your Videos

Hunyuan Video Foley is a Tencent model that generates foley for an existing video: object sounds, footsteps, clothing rustle and environmental ambience, synchronized with the motion on screen. In this Hunyuan Video Foley review we explain how to add sound to a silent video online, what audio for a five-second clip costs, and how to describe a scene so the result comes out clean.

Foley is a classic film technique: a sound artist in a studio recreates the sounds of the action by hand — footsteps on gravel, a creaking door, clinking dishes. Without foley, even a beautiful shot feels empty. AI video generators often output clips with no sound or only a vague background bed, and this is the gap Hunyuan Video Foley fills: the model “watches” the video and generates sounds that match what is happening on screen, at the moment it happens.

The model is positioned as a post-production-grade tool: detailed sounds, careful synchronization with motion, and ambience that makes a scene believable. It is useful for editors, ad producers, social media teams and anyone generating video with AI models that have no built-in audio.

What Hunyuan Video Foley can do

The model works in video-to-audio mode: your video goes in, and a soundtrack fitted to the on-screen motion comes out. A short text description helps specify which sounds you want, and a negative prompt filters out what you do not.

• Footsteps and movement. Character footsteps, clothing rustle, room or street acoustics.
• Nature and weather. Forest, sea, rain, wind — background ambience for landscape shots.
• City and street. Traffic, passersby, urban hum.
• Interior and objects. Doors, dishes, keyboards, room tone.
• Action and impacts. Hits, glass, explosions and whooshes for dynamic edits.
• Product close-ups. Unboxing, clicks and fabric for ads.
• Kitchen, ASMR, vehicles, sports. Sizzling pans, macro sound, engines and trains, ball hits and breathing.

All of these scenarios are available in the dashboard as ready-made presets that you can use as a starting point and extend with details of your own scene.

Default settings

The model card comes with balanced defaults: 50 inference steps, a guidance scale of 4.5 and the negative prompt “noisy, harsh”, which filters out rough, grating sound. The number of steps affects how thoroughly the audio is worked out, while guidance sets how strictly the model follows your text. For most clips the defaults are the sweet spot, and the base price is calculated with them.

Hunyuan Video Foley specs

Parameter	Value
Developer	Tencent
Model type	Foley and sound effects for video
Input mode	Video-to-audio
Default settings	50 steps, guidance scale 4.5, negative prompt “noisy, harsh”
Price	From 15 credits per 5 seconds of video (about $0.17–0.22)

How to use Hunyuan Video Foley in WebTerra AI

1. Sign up for WebTerra AI — 60 free credits arrive right away.
2. Open the video sound generator in your dashboard and choose Hunyuan Video Foley.
3. Upload the video that needs sound — a clip from an AI generator or your own silent footage.
4. Pick a preset that matches your scene, or briefly describe the sounds in English.
5. Extend the negative prompt if needed — for example, if the scene should have no music or voices.
6. Check the cost in the dashboard (it depends on the video length) and start the generation.
7. Play the result together with the picture and pay attention to key sync points: footsteps, hits and touches.

Models for generating video and sound for it are collected on the AI video generation page.

Hunyuan Video Foley pricing

The cost of generating sound for a five-second video:

Plan	Credits	Cost in USD
Starter	17	about $0.22
Pro	16	about $0.19
Ultra	15	about $0.17

Longer clips cost more; the dashboard shows the exact amount before you start. The 60 free credits cover three five-second clips on the Starter plan — for example, a walking shot, a kitchen scene and a product macro, which is enough to compare results. See all plans on the WebTerra AI pricing page.

Prompt examples for Hunyuan Video Foley

For a foley model, the description is a list of sounds and the character of the space, not a plot. Write in English, keep it short and specific. The examples below follow the built-in presets.

Footsteps and movement

footsteps on a wooden floor, soft rustle of a leather jacket, quiet room reverb

Nature and weather

waves crashing on rocks, strong wind, distant seagulls, open outdoor ambience

Kitchen and food

sizzling pan, oil crackling, knife chopping vegetables on a wooden board, kitchen ambience

Product close-up

cardboard box opening, paper wrapping rustle, plastic click, close-up detailed sound

Action and impacts

heavy punch impact, glass shattering, fast whoosh, debris falling

City and street

busy city street, passing cars, distant horns, footsteps of passersby, light crowd chatter

ASMR and macro sound

close-up ASMR sound, fingers tapping on a glass jar, soft brush strokes, very quiet background

Sports

basketball bouncing on an indoor court, sneakers squeaking, heavy breathing, gym hall echo

Vehicles

old steam train passing by, metal wheels on rails, hissing steam, distant whistle

Interior and objects

Quiet office or home scenes benefit from subtle room tone under the main actions:

keyboard typing, coffee mug placed on a desk, chair creak, soft office room tone

Tips for clean foley

Describe sounds, not visuals

The model already sees the video. Text is there to specify materials and the character of the sound: footsteps on gravel and footsteps on marble sound completely different, even if the picture makes that hard to tell.

Specify the acoustics

Words like “small room”, “large hall”, “open outdoor” or “close-up” help you get the right reverb. Sound that does not match the space gives the edit away instantly.

Use the negative prompt

If unwanted elements creep in — music, voices, hum — add them to the negative prompt. The default “noisy, harsh” already removes rough noise.

Split long videos into scenes

When a video has several locations, it is easier to generate sound for each scene separately with its own description. The ambience will not bleed from one scene into the next, and you only pay for the fragments you need.

Check sync at key moments

Viewers notice desync most at points of contact: a foot hitting the floor, a door closing, a ball striking the ground. Review exactly those moments. If a sound lags or the wrong material is heard, refine the description and regenerate the fragment.

Mix in your editor

Foley is one layer of the soundtrack. Music, voice and foley are best mixed in an editor, where you can balance levels and emphasize what matters.

Use cases: who Hunyuan Video Foley is for

• AI video creators — believable sound for clips from generators that produce silent video.
• Editors and production teams — a fast foley layer without a studio session.
• Advertising and e-commerce — unboxing, clicks and fabric sounds for product videos.
• Social media and Reels — ASMR, food content and atmospheric short videos.
• Game developers and animators — sound for trailers, cutscenes and prototypes.
• Sports and travel content — ball hits, breathing, vehicles and nature.

Fitting the model into your workflow

The most common pipeline: generate the video in a model without audio, trim the fragments you need, run each through Hunyuan Video Foley with a sound description, and then add music and voice in your editor. Each layer of the soundtrack stays under your control.

Comparison with other video-to-sound models

Model	Strength	When to choose it
Hunyuan Video Foley	Cinematic, post-production-grade foley	Detailed object sounds and footsteps
MMAudio V2	Sound for video from a prompt	When you want to steer the sound with text
Mirelo SFX 1.6	Synced SFX up to 60 s	Longer clips
Kling Video to Audio	Sound from a prompt, up to 20 s	Short clips with a text description of the sound
Cassette Video SFX	The cheapest option	High volume and drafts

Hunyuan Video Foley is the pick when detail and precise sync matter. For longer clips, see our Mirelo SFX 1.6 review. If you prefer to define the sound with text, compare it with MMAudio V2. For drafts and high volume, the most economical option is Cassette Video SFX.

The catalog has other options with their own focus too: ThinkSound matches sound to the meaning of the scene, Sonilo SFX 1.1 offers effects with a commercial license, and PixVerse Sound Effects adds background music to the effects. If a clip needs both effects and music, it is worth comparing several models on the same fragment.

Limitations

• A finished video is required. The model does not create sound from nothing; it works only with an uploaded clip.
• Foley, not music or speech. Music and voiceover require separate models.
• Price scales with duration. The base cost is for 5 seconds; longer videos cost more.
• Busy scenes need guidance. When many things happen at once, name the main sounds in the description, or the model may emphasize the wrong action.

FAQ

How much does Hunyuan Video Foley cost?

Sound for a five-second video costs 15–17 credits depending on your plan, roughly $0.17–0.22.

What is foley?

Foley is the sound of actions and objects on screen: footsteps, clothing rustle, clinking dishes, creaking doors. It is traditionally recorded in a studio; Hunyuan Video Foley generates it automatically to match the motion in your video.

Do I need to write a prompt?

The model works from the video, but a short English description helps specify materials, space and the main sounds.

Does it generate music or voices?

No, it specializes in effects and ambience. The catalog has separate models for music and voiceover.

What does the “noisy, harsh” negative prompt do?

It filters out rough, grating sound. You can add other unwanted elements, such as “music, voices”.

Which videos give the best results?

Clips with clear, visible action: footsteps in frame, hands touching objects, moving vehicles. The clearer it is on screen what happens and when, the more precisely the model places the sounds in time.

Hunyuan Video Foley turns a silent clip into a scene people want to watch with the sound on: footsteps, objects and ambience in step with the motion. Sign up, claim your 60 free credits and add sound to your video in WebTerra AI.