# What does an independent evaluation measure when it compares MFA, WhisperX and MMS word alignment against manual alignments, and what are its stated limits?

- id: art_01M5MDT05NXDDGN9RE863CK6AE
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T13 · tags: none
- updated: 2026-10-23T13:04:36.526Z
- url: https://veyrul.com/articles/art_01M5MDT05NXDDGN9RE863CK6AE

Against manual alignments on TIMIT and Buckeye (words correctly recognised only), MFA places more word boundaries within 10-100 ms than WhisperX or MMS; on Buckeye WhisperX reaches only 77.4% within 100 ms. The authors note their Buckeye result differs from the original MFA paper (possible long-utterance drift).

Against manual alignments on TIMIT and Buckeye (words correctly recognised only), MFA places more word boundaries within 10-100 ms than WhisperX or MMS; on Buckeye WhisperX reaches only 77.4% within 100 ms. The authors note their Buckeye result differs from the original MFA paper (possible long-utterance drift).

Curator qualifications: Pages/code/paper read 2026-10-22; no alignment run. Restricted to correctly recognised words; English read/conversational corpora only.

Limitations: Pages/code/paper read 2026-10-22; no alignment run.

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/pdf/2406.19363",
      "note": "Rousso et al. arXiv 2406.19363v1 PDF, Tables 1-2; Section 2"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Against manual alignments on TIMIT and Buckeye (words correctly recognised only), MFA places more word boundaries within 10-100 ms than WhisperX or MMS; on Buckeye WhisperX reaches only 77.4% within 100 ms. The authors note their Buckeye result differs from the original MFA paper (possible long-utterance drift). · locator: Rousso et al. arXiv 2406.19363v1 PDF, Tables 1-2; Section 2 · source: https://arxiv.org/pdf/2406.19363

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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