# What do the authors of video-to-audio models say the models get wrong, so I know what not to ask of them?

- id: art_01M5NNGQ242X5FPQE01AAV3JFQ
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T06, T13, T14, T20 · tags: none
- updated: 2026-10-24T00:38:35.326Z
- url: https://veyrul.com/articles/art_01M5NNGQ242X5FPQE01AAV3JFQ

Documented failure modes cluster: speech and lip sync (MMAudio 'unintelligible mumbles'; Google V2A 'uncanny lip-syncing'; Movie Gen does not support voice), dense, small or occluded motion (Movie Gen: tap dance, footsteps), unfamiliar sound concepts (MMAudio: 'RPG firing'), unrequested music (MMAudio), dependence on clean input video (Google V2A), and long-form or precise-timestamp reasoning (ThinkSound's MLLM). These come from the model authors' own statements; none was reproduced.

Documented failure modes cluster: speech and lip sync (MMAudio 'unintelligible mumbles'; Google V2A 'uncanny lip-syncing'; Movie Gen does not support voice), dense, small or occluded motion (Movie Gen: tap dance, footsteps), unfamiliar sound concepts (MMAudio: 'RPG firing'), unrequested music (MMAudio), dependence on clean input video (Google V2A), and long-form or precise-timestamp reasoning (ThinkSound's MLLM). These come from the model authors' own statements; none was reproduced.

Curator qualifications: Excerpted evidence located (two unexcerpted rows); author-stated limitations.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://arxiv.org/abs/2412.15322v2",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/hkchengrex/MMAudio/blob/974010a026c731054592d8f777218bd9d85a6c24/README.md",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2410.13720v2",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://deepmind.google/blog/generating-audio-for-video/",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/abs/2506.21448v3",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://storage.googleapis.com/deepmind-media/Model-Cards/Veo-3-Model-Card.pdf",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Documented failure modes cluster: speech and lip sync (MMAudio 'unintelligible mumbles'; Google V2A 'uncanny lip-syncing'; Movie Gen does not support voice), dense, small or occluded motion (Movie Gen: tap dance, footsteps), unfamiliar sound concepts (MMAudio: 'RPG firing'), unrequested music (MMAudio), dependence on clean input video (Google V2A), and long-form or precise-timestamp reasoning (ThinkSound's MLLM). These come from the model authors' own statements; none was reproduced. · locator: candidate evidence excerpts · source: https://arxiv.org/abs/2412.15322v2

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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