AI-Powered Sound Generation
Add Sound to Any Video
Generate realistic, synchronized sound effects for your videos using MMAudio V2.
- ~8s Max Duration
- ~10s Processing
- 0.5 Credit
- Operational
Generated audio is merged directly into the video.
A failed job costs nothing — credits are returned automatically. We keep photo and video results for 30 days, and guest files are deleted after 14 days.
Credit packs from $1.49, one-time. Credits never expire and no subscription is required.
How It Works
- Step 1
Upload Video
Upload the video you want to add sound to.
- Step 2
Describe Sounds
Write a prompt describing what sounds should accompany the video.
- Step 3
Download
Get your video with AI-generated audio merged in.
How It Works
AI-Synchronized Audio
MMAudio V2 analyzes your video content and generates perfectly timed sound effects.
Video-Aware Generation
The AI understands what happens on screen and creates matching ambient sound.
Lightning Fast
Results in under a minute — no complex audio editing needed.
Who Is It For?
Perfect for creators who need quick audio
Filmmakers
Add ambient sound and foley effects to short film scenes.
Content Creators
Enhance silent screen recordings and B-roll with natural audio.
Game Developers
Generate sound effects for game trailers and demo videos.
Social Media
Make silent clips more engaging with AI-generated ambient audio.
Frequently Asked Questions
How does it know what sounds to generate?
MMAudio V2 analyzes each frame of your video to generate audio that matches the on-screen action.
Can I control the generated sounds?
Yes — use the text prompt to describe desired sounds, and the negative prompt to exclude unwanted ones.
Does it replace existing audio?
Yes, the generated audio replaces any existing track. Best for videos where you want entirely new sound.
What sounds work best?
Environmental sounds, impacts, footsteps, nature, and ambient audio. Pure speech is less reliable.
How long can the video be?
The model works best with clips up to 8 seconds. Longer videos are truncated to the duration.
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Add Sound to Your Videos
AI-generated audio that matches your video perfectly.
Call it from code
One endpoint, key in the header. The same tool that runs on this page — no browser, no clicking.
curl -X POST https://pixelift.pl/api/v1/generations \
-H "Authorization: Bearer pk_live_..." \
-H "Idempotency-Key: $(uuidgen)" \
-F "tool=video-add-sound" \
-F "video=@klip.mp4" \
-F "prompt=szum ulicy i kroki" \
-F "duration=8"Response: { "id": "cmk8…", "tool": "video-add-sound", "status": "running", "links": { "self": "/api/v1/generations/cmk8…", "events": "/api/v1/generations/cmk8…/events" } } Responds 202 — get the result with GET /api/v1/generations/{id} or the …/events stream.
A retry with the same Idempotency-Key header is never charged twice; status and the event stream live at /api/v1/generations/{id}. The tool's direct route still works: POST /api/ai-video/add-sound
Request fields
tool | string | required | Narzedzie (v1) |
video | file | required | Nieme wideo |
prompt | string | required | |
duration | number | optional |