What platforms does MMAudio support?

MMAudio is available on Web App.

What are the limitations of MMAudio?

Uploads are limited to mp4 files at a maximum of 50 MB. Default clip duration is 8 seconds, so longer scenes need to be handled piece by piece. The FAQ itself flags known limitations and slight run to run variation, so results are not fully deterministic.

MMAudio

Name: MMAudio
Author: MMAudio

Generates synchronized sound effects and ambience for silent video clips

Beginner

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Screenshot of MMAudio, Generates synchronized sound effects and ambience for silent video clips

What is MMAudio?

MMAudio is an audio editing tool that generates synchronized sound effects and ambience for silent video clips. A web based video to audio synthesizer that analyzes a clip's visual context and generates matching sound effects, ambience and atmospheric audio from a keyword prompt, with multiple model versions and credit based generation.

MMAudio is a web tool that takes a silent video clip and produces a matching audio track. The system reads visual cues, motion and scene context, then synthesizes environmental sound, sound effects and atmospheric beds that line up with what happens on screen. The output is intended as a ready soundtrack layer rather than music: think ice cracking under a blade, waves against a shoreline, a shovel biting into dry earth. The site shows side by side comparisons of its results against a competing audio model on those exact scenes. The workflow is deliberately short. A visitor uploads an mp4 of up to 50 MB or points the tool at a video URL, writes a comma separated list of English keywords in a prompt field, and optionally adds a negative prompt to steer the model away from unwanted sounds. A duration control defaults to 8 seconds, and a model selector offers V1 Standard, V2 Premium and MMAudio v3 Beta, each generation costing a stated number of credits. Generated audio appears in a player panel on the same page once processing finishes. It suits editors who need quick Foley or ambience for social clips, game prototype trailers, archive footage restoration, educational videos and short narrative pieces. The pitch is speed and scene awareness: the tool is aimed at creators who would otherwise spend time hunting through sound libraries or recording effects themselves, and it handles the context matching for them. Where it sits relative to alternatives is narrow and honest. It is not a music generator, a voice tool or a full editing suite. It is a single-purpose sound layer for video, and the current version has documented limitations and output variation that the team acknowledges in its FAQ. Anyone expecting frame-perfect studio Foley on long-form footage should test short clips first.

How do you use MMAudio?

1Open the tool and load your clip
Go to the homepage and either drag an mp4 onto the upload area or paste a video URL. Files must be mp4 and no larger than 50 MB.
2Describe the sound you want
Enter English keywords separated by commas in the prompt field, for example the material, action and ambience you expect. Add a negative prompt for sounds you want excluded.
3Set duration and pick a model
Adjust the duration control from its 8 second default and choose between V1 Standard, V2 Premium and MMAudio v3 Beta. Each option shows the credit cost before you run it.
4Generate and review the audio
Press Generate Audio and wait for processing. The result appears in the player panel on the same page, where you can compare it against the video.
5Adjust and regenerate
If the soundscape does not fit, change keywords, add exclusions to the negative prompt or switch model versions, then run another pass.

Pros and cons

Pros

Context aware sound synthesis that reads motion and scene elements rather than applying generic effectsAI
Short workflow: upload, prompt, choose duration and model, then download the resultAI
Prompt and negative prompt fields give direct control over which sounds appear and which are suppressedAI
Model selector spans Standard, Premium and a v3 Beta so quality and cost can be traded offAI
Public example comparisons against a competing audio model let you judge output before committing creditsAI

Cons

Uploads are limited to mp4 files at a maximum of 50 MBAI
Default clip duration is 8 seconds, so longer scenes need to be handled piece by pieceAI
The FAQ itself flags known limitations and slight run to run variation, so results are not fully deterministicAI
No music, speech or voice generation, which means a full soundtrack still needs other toolsAI
You must write prompts as comma separated English keywords, which rules out natural language descriptionsAI

How much does MMAudio cost?

Pricing

Generation runs on credits: each run states a credit requirement (1 credit for the default configuration shown), and model choice affects quality and cost across V1 Standard, V2 Premium and MMAudio v3 Beta. The homepage does not publish credit prices or subscription tiers.

Learn more

Features

Automatic environmental sound and Foley synthesis from video, prompt and negative prompt keyword control, adjustable duration, three model versions including a beta, high fidelity synchronized output, and fast processing aimed at minutes rather than hours.

Frequently asked questions about MMAudio

How much does MMAudio cost?
Generation runs on credits: each run states a credit requirement (1 credit for the default configuration shown), and model choice affects quality and cost across V1 Standard, V2 Premium and MMAudio v3 Beta. The homepage does not publish credit prices or subscription tiers.
How do you use MMAudio?
The walkthrough on this page covers 5 steps: 1. Open the tool and load your clip 2. Describe the sound you want 3. Set duration and pick a model 4. Generate and review the audio 5. Adjust and regenerate.
What platforms does MMAudio support?
MMAudio is available on Web App.
What are the limitations of MMAudio?
Uploads are limited to mp4 files at a maximum of 50 MB. Default clip duration is 8 seconds, so longer scenes need to be handled piece by piece. The FAQ itself flags known limitations and slight run to run variation, so results are not fully deterministic.