Part 1. Overview

FineVoice AI Sound Effect Generator is an intelligent audio engine powered by multimodal generation technology. It semantically parses text input and extracts visual features from video frames to build cross-modal semantic mappings, enabling the creation of original sound effects that closely match the scene context.

Core features include:

Text Semantic Modeling: Uses NLP to understand user-described actions, emotions, and scene elements.
Video Frame Analysis: Applies computer vision for object detection, scene recognition, and event breakdown across key frames.
Sound Effect Synthesis and Rendering: Utilizes deep generative models (like diffusion models and VAEs) for realistic sound effects, ensuring temporal alignment and acoustic optimization.

FineVoice AI Sound Effect Generator is ideal for short video creation, advertising, vlog editing, and more. FineVoice AI enables creators to quickly generate tailored sound effects without relying on extensive pre-made libraries.

Prerequisites

Before getting started, please prepare the following:

A FineVoice account
Stable internet connection
The latest version of Google Chrome or Edge

Limitations and Benefits

	Free	Basic	Pro	Enterprise
Text to Sound Effects	30	100	250	500
Video to Sound Effects	20	60	120	240
Result Download	No	Yes	Yes	Yes

Check Full FineVoice Pricing >>

Part 2. Quick Start

How to Quickly Convert Text to Sound Effects

Step 1. Go to FineVoice AI Tools

Select AI Sound Effects → Text to SFX in the left menu bar.

Step 2. Enter a Creative Description

Type your desired sound effect description in the input box, or click "Random inspiration".

Example: The eerie creaking of an old wooden door in a haunted house.

Step 3. Enter Negative Prompts (Optional)

If there are sound elements you want to exclude, enter them here. Multiple inputs are supported.

Example: music, voice

Step 4. Set Sound Effect Duration

Choose the length of the generated sound effect:

Minimum: 6 seconds
Maximum: 30 seconds
Default: 10 seconds

Step 5. Generate and Download Sound Effect

Click the "Generate" button at the bottom. Once complete, your sound effect will appear in the history list, where you can:

Preview online
Download and save

How to Quickly Convert Video to Sound Effects

Step 1. Go to FineVoice AI Tools

Select AI Sound Effects → Video to SFX from the menu on the left.

Step 2. Upload Video File

Click the upload area and select a local video file.

Formats: MP4 / WMV
Maximum duration: 10 seconds
Maximum file size: 100 MB

Step 3. Enter Creative Description

Describe the type of sound effect you want to generate. The system will use both the video content and your prompt to create matching sound effects.

Example: The sound of shoes exploding.

If there are sounds you want to exclude, add them in the "Negative Description" field. Multiple exclusions are supported.

Example: music, voice

Step 4. Automatically Generate Synchronized Sound Effects

Click the "Generate" button. FineVoice will analyze the video frame by frame and generate sound effects synchronized to the scene.

Sound effect length = video duration
Once the generation is complete, you can preview the result in the history list. You can also:
- Download the audio
- Download the video (with sound effects)
- Regenerate
- Edit again
- Delete the sound effect

Part 3. Notes and Limitations

Text to SFX

You can quickly create original sound effects by entering a text description. Creative prompts, negative prompts, and duration settings are supported.

Creative Prompt: Describe the sound effect you want to generate, up to 250 characters.
Example: The eerie creaking of an old wooden door in a haunted house.
Negative Prompt: Exclude elements you don't want in the sound effect.
Example: Music or Voice
Duration:
Minimum: 6 seconds
Maximum: 30 seconds

Video to SFX

FineVoice can semantically analyze video frames and generate sound effects that match the visual dynamics, achieving seamless video-to-audio synthesis.

Video Requirements:
Duration: ≤ 60 seconds
File size: ≤ 100 MB
Formats: MP4 / WMV
Prompt Settings:
Supports both creative and negative prompts, functioning the same as in text-to-sound generation.
Sound Effect Duration:
Automatically matches the length of the video.

Known Limitations

Processing time increases with video length.
Complex acoustic environments may require additional processing.
Output quality depends on the clarity of the input video.
Some unique sound effects may require specialized handling.
Resource requirements vary with video complexity.
Performance may fluctuate with rapid scene changes.

Part 4. Best Practices

How to Write Better Prompts for Text-to-SFX

The way you write prompts for Text to SFX greatly affects the realism and relevance of the generated sound effects. Consider the following aspects to enhance your results:

1. Basic Structure Formula

A good sound effect prompt typically includes:

Scene + Sound Source + Texture/Timbre + Dynamics/Action + Emotional Atmosphere

Sample Formula:
[Scene] + [Sound Source] + [Texture/Timbre] + [Action/State] + [Emotional Atmosphere]

Example:

In a haunted castle, the sound of heavy chains clinking against stone walls, echoing with a chilling resonance.
A busy city street at night, with cars honking sharply and footsteps echoing in the alley, creating a tense and urgent mood.

2. Refined Key Points

Scene: Specify the space or environment (e.g., forest, tunnel, seaside, laboratory).
Sound Source: Indicate where the sound comes from (e.g., door, wind, rain, animal, machine).
Sound Characteristics: Describe the sound quality (e.g., deep, sharp, echoing, raspy).
Action/Dynamics: Explain the action taking place (e.g., creaking, impact, gradually intensifying).
Atmosphere/Emotion: Set the emotional tone (e.g., eerie, peaceful, tense, joyful).

3. Use Negative Prompts

Remove unwanted sound elements to avoid confusion.

Example: music, voice
Or: background chatter, animal sounds

4. Examples of Different Prompt Types

Ambient Sound:
The soft rustling of leaves in a quiet forest, with occasional birds chirping in the distance.
Mechanical Sound:
A malfunctioning robot arm sparking with metallic grinding noises.
Horror Sound Effect:
The faint sound of whispers behind a locked door, mixed with a sudden metallic screech.
Sci-Fi Sound Effect:
A spaceship engine humming with a deep futuristic vibration, accelerating into hyperspace.

5. Practical Tips

Be Specific: Avoid vague descriptions like "door sound". Instead, write "an old wooden door creaking slowly with an eerie echo".
Control Length: One sentence with 15–30 words works best. Too short is not specific enough; too long can be distracting.
Include Atmosphere Words: Words like eerie, tense, peaceful, chaotic significantly improve matching accuracy.
Try Multiple Times: AI generation is random, so experiment with different styles of prompts for the best results.

How to Write Better Prompts for Video-to-SFX

Video-to-SFX prompts are similar to text-to-SFX, but since the video already provides visual information, prompts mainly supplement or guide atmosphere and details. Here's a technical and practical guide:

1. Understand the Role of Prompts in Video SFX Generation

The video provides the main information (action, scene, objects).
Prompts guide (highlight atmosphere, emphasize key sounds, exclude distractions).
In short, the video shows "what you see", and the prompt tells "what you hear".

2. Prompt Formula for Video SFX

Recommended Structure:
[Scene Atmosphere] + [Sound Focus] + [Sound Character/Texture] + [Emotion/Atmosphere]

Scene Atmosphere: Reinforce the video setting (e.g., dark cave, futuristic lab, busy street).
Sound Focus: Point out key sound sources (e.g., footsteps, crashing waves, machinery hum).
Sound Character: Specify timbre or dynamics (e.g., metallic echo, soft rustle, high-pitched squeal).
Emotion/Atmosphere: Set the feeling (e.g., tense, ominous, peaceful, chaotic).

3. Writing Tips

Supplement missing sound details:
If the video lacks sound details, use prompts to fill the gap.
Example: Rainy street
Prompt: Heavy rainfall splashing on concrete with distant thunder and car tires hissing through puddles.
Emphasize important sounds:
If there are multiple actions, prompts can highlight the desired sound source.
Example: In the crowd, someone is closing a door
Prompt: The loud slam of a metal door echoing over faint background chatter.
Guide atmosphere consistency:
Use emotion words to match sound with the video's mood.
Example: A horror scene
Prompt: A faint whisper mixed with creaking floorboards, creating an eerie and suspenseful tension.
Use negative prompts wisely:
Exclude irrelevant sounds to avoid distraction.
Example: music, voices

4. Example Comparisons

Nature Scene
Video: Waves crashing on rocks
Prompt: Powerful ocean waves crashing against rocky cliffs with foamy splashes, deep and immersive.
Mechanical Scene
Video: Robot powering up
Prompt: A futuristic robot powering up with mechanical whirring, metallic clicks, and an electric hum.
Urban Scene
Video: Night street
Prompt: Busy city traffic with honking horns, tire screeches, and distant sirens, creating a tense atmosphere.
Horror Scene
Video: Dark corridor
Prompt: The slow creak of old wooden floorboards and a sudden metallic clang in the distance, ominous and chilling.

5. Practical Tips

Be specific:
Avoid vague prompts like "car sound". Use "car tires screeching on wet asphalt".
Control length:
One sentence, 15–25 words—clear, focused.
Match video atmosphere:
The video shows what's happening; the prompt should guide how it feels.
Try multiple versions:
The same video can use different prompts to generate varied sound styles.

Part 5. Support & Feedback

If you encounter any issues, use the Feedback button in the top right corner of the software.

FineVoice AI Sound Effect Generator Guide

Recommended Posts for You

Start Your AI Voice Journey with FineVoice for Free