MMaudio V2

MMAudio v2 — wavespeed-ai/mmaudio-v2

MMAudio v2 generates high-quality sound effects and ambience for a video using the visual content plus a text prompt. Upload a clip, describe the audio you want (environment, materials, impacts, whooshes, texture), and the model synthesizes a synced audio track that matches motion and timing. It’s ideal for adding cinematic SFX, atmospheric layers, and “sound design” style audio to silent footage.

Key capabilities

• Video-to-audio generation (adds sound to an existing video)
• Prompt-driven sound design: ambience, impacts, textures, mechanical sounds, nature
• Timing-aware audio that follows visual motion beats
• Optional negative_prompt to avoid unwanted audio characteristics
• Duration control for generating audio for different clip lengths
• mask_away_clip option for generating audio without directly using the original clip audio

Use cases

• Add cinematic ambience to silent clips (city night, wind, rain, room tone)
• Create synced sound effects (footsteps, fabric rustle, metal clanks, sparks)
• Product and food sound design (sizzles, pours, crackles, knife cuts)
• Trailer-style audio layers for short edits and social videos
• Rapid sound prototyping before final mix and mastering

Pricing

Examples:

Inputs

• video (required): the source video to generate audio for
• prompt (required): describe the desired sound

Parameters

• duration: audio length in seconds
• num_inference_steps: sampling steps
• guidance_scale: prompt adherence strength
• negative_prompt: what to avoid (e.g., “muffled, noisy, distorted, music”)
• mask_away_clip: whether to mask away the clip (useful when you want fully generated audio)

Prompting guide (video → audio)

Write prompts like a sound designer:

• Environment: location + ambience (rainy alley, factory hall, forest dawn)
• Materials: metal, glass, lava, fabric, wood, water
• Actions: slice, pour, crackle, hiss, whoosh, impact
• Texture: crisp, gritty, low rumble, sparkling high-end, subtle room tone
• Timing beats: “as the blade presses in…”, “when the cube hits the ground…”

Example prompts

• A glowing lava cube crackles and pops with ember flickers. A tungsten blade presses into the semi-liquid core with a soft sizzling hiss, tiny molten droplets splatter, low rumble underneath, cinematic close-mic detail.
• Rainy city night ambience with distant traffic, soft wind, occasional footsteps, subtle neon buzz, realistic stereo space.