Mirelo Releases SFX 2.0: Video-to-Audio Sound Design with Music Leakage Removal and Speech Preservation

On October 14, 2026, AI audio company Mirelo officially unveiled Mirelo SFX 2.0, a dedicated video-to-audio sound design model engineered to generate high-fidelity sound effects, foley, and ambience directly from video inputs.

Image source: Mirelo (@MireloAI)

While recent video foundation models increasingly offer native audiovisual generation, creators frequently face severe production bottlenecks: models often bleed unwanted background music into clips, and audio characteristics shift noticeably across cuts. Mirelo SFX 2.0 moves away from prompt-only text-to-sound synthesis by taking video footage as its primary input, building audio tracks tightly synchronized to on-screen motion, setting, and pacing.

Music Leakage Removal and Speech Preservation

A central technical advance in Mirelo SFX 2.0 is its targeted approach to two persistent pain points in AI video generation: 'music leakage' and 'speech preservation'.

Generative video models routinely insert unprompted background music into rendered clips. In conventional workflows, creators forced to regenerate a clip waste compute credits and risk losing a preferred take, while simply muting the video track strips out the actor or character dialogue along with the noise.

• Unwanted Music Removal: SFX 2.0 isolates and removes unprompted musical elements baked into the video clip, substituting them with context-appropriate ambience and foley effects that match the physical setting. This leaves creators free to layer their own deliberate score or BGM independently.
• Dialogue Preservation: When a video model generates high-quality speech but produces poor or unnatural surrounding sound effects, SFX 2.0 identifies the vocal track, preserves the spoken dialogue intact, and rebuilds the sound design around it. Editors can retain their chosen performance take while performing a clean audio overhaul.

Continuity Across Cuts and Single-Pass 10-Minute Edits

Mirelo SFX 2.0 also addresses the clip-by-clip fragmentation common to earlier AI audio pipelines.

When clips are generated in isolation, the same object or space often sounds completely different from one shot to the next—a car engine note changes across camera angles, or the room tone jumps between reverse shots. Mirelo SFX 2.0 processes complete edited sequences in a single pass to maintain acoustic continuity across cuts.

• One-Pass Sequence Processing: Editors can submit an entire timeline rather than splitting finished video edits into individual short shots for separate audio passes.
• Duration Specifications: In the Mirelo Studio web editor and official API, the standard processing capacity supports video clips up to 10 minutes in length. Extended long-form projects exceeding 10 minutes are available without length limits through Mirelo's Enterprise tier.

Blind Listening Benchmarks and Platform Availability

To validate model fidelity, Mirelo evaluated SFX 2.0 through blind listening tests against dedicated video-to-audio solutions and native audio generated by frontier video foundation models.

The benchmark enlisted 25 evaluators who scored 30 video samples across two criteria: overall audio quality and temporal alignment with on-screen actions.

• Preference Over Dedicated Audio Models: In direct comparison against Sony's Woosh video-to-sound model, evaluators preferred Mirelo SFX 2.0 in 81% of evaluation pairs.
• Performance Against Native Model Audio: When tested against the native audio output of leading generative video models—including Seedance 2.5, Veo 3.1 Fast, MiniMax H3 Max, Flux 3, and Kling—evaluators on average rated Mirelo SFX 2.0 higher in audio fidelity and contextual fit.

Mirelo SFX 2.0 is available immediately as of its October 14, 2026 launch across the Mirelo Playground, Mirelo Editor, official API, and Mirelo MCP, with hosted integrations live on Runway and Fal. Mirelo announced that additional platform partnerships and creative workflow integrations will roll out sequentially.

Sources

• Mirelo Official X (@MireloAI): Mirelo SFX 2.0 Official Launch Announcement
• Mirelo Official Blog: Mirelo SFX 2.0 Release Breakdown and Benchmarks