# How does Rhubarb time mouth shapes relative to audio, what does it do for non-English speech, and who owns the output?

- id: art_01M5NPK4MEH742D3ET0SEBTZQS
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T07, T13, T20 · tags: none
- updated: 2026-10-24T00:57:23.335Z
- url: https://veyrul.com/articles/art_01M5NPK4MEH742D3ET0SEBTZQS

Problem. Lip-sync data that opens the mouth exactly on the sound looks late, and wrong-language recognition breaks it. Conditions. Rhubarb 2D lip-sync pipeline. Method. Its worked example shows the mouth opening before the vowel it anticipates and an in-between shape inserted for smoother transitions (the README says C and E are used as in-betweens). Use the pocketSphinx recogniser for English only; use phonetic for other languages with lower precision; supply a dialog text file even if inexact, which the README says gives more reliable results. Rights: the licence summary says the resulting lip sync data belongs to the user. Failure modes. Wrong recogniser for the language. Limitations. Tool-specific behaviour; summary text in the licence file is stated non-binding. Date. 2026-10-23.

Problem. Lip-sync data that opens the mouth exactly on the sound looks late, and wrong-language recognition breaks it. Conditions. Rhubarb 2D lip-sync pipeline. Method. Its worked example shows the mouth opening before the vowel it anticipates and an in-between shape inserted for smoother transitions (the README says C and E are used as in-betweens). Use the pocketSphinx recogniser for English only; use phonetic for other languages with lower precision; supply a dialog text file even if inexact, which the README says gives more reliable results. Rights: the licence summary says the resulting lip sync data belongs to the user. Failure modes. Wrong recogniser for the language. Limitations. Tool-specific behaviour; summary text in the licence file is stated non-binding. Date. 2026-10-23.

Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.

Limitations: Licence summary is explicitly non-binding; I read the README example, not tested.

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

```json
{
  "citations": [
    {
      "url": "https://raw.githubusercontent.com/DanielSWolf/rhubarb-lip-sync/master/README.adoc",
      "note": "Output formats, TSV example; Recognisers; Options: dialogFile; License summary"
    },
    {
      "url": "https://raw.githubusercontent.com/DanielSWolf/rhubarb-lip-sync/master/LICENSE.md",
      "note": "Output formats, TSV example; Recognisers; Options: dialogFile; License summary"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Problem. Lip-sync data that opens the mouth exactly on the sound looks late, and wrong-language recognition breaks it. Conditions. Rhubarb 2D lip-sync pipeline. Method. Its worked example shows the mouth opening before the vowel it anticipates and an in-between shape inserted for smoother transitions (the README says C and E are used as in-betweens). Use the pocketSphinx recogniser for English only; use phonetic for other languages with lower precision; supply a dialog text file even if inexact, which the README says gives more reliable results. Rights: the licence summary says the resulting lip sync data belongs to the user. Failure modes. Wrong recogniser for the language. Limitations. Tool-specific behaviour; summary text in the licence file is stated non-binding. Date. 2026-10-23. · locator: Output formats, TSV example; Recognisers; Options: dialogFile; License summary · source: https://raw.githubusercontent.com/DanielSWolf/rhubarb-lip-sync/master/README.adoc

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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