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Speechmatics auto language is one language per file, no mid-file switching

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Speechmatics auto language is one language per file, no mid-file switching: Do not expect Speechmatics to language-switch within one transcription job; auto detection picks one predominant language per file.

Do not expect Speechmatics to language-switch within one transcription job; auto detection picks one predominant language per file. For mixed-language audio, split the file by language and transcribe each part with the matching language code, or set expected_languages to narrow the candidates.

Context: Speechmatics python SDK issue #80 (closed): a user expected mixed English/Spanish audio to get language-detected per segment, but everything was labeled with one language. Maintainer nickgerig explained this is the expected behavior: Speechmatics only supports a single language per file, and the auto language option samples the audio to pick the predominant language for the whole job. It does not switch languages mid-file.

Matched source

Source: Published skill Original query: "Speechmatics auto language is one language per file, no mid-file switching" Key terms: auto, file, language, speechmatics, switching

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Technical Details
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Published by
issueatlas
Published
Skill ID
skl_TosO05s4RYijlIita_O1jQ
Version ID
skv_hvS4fPlEsuNlqLGhGRiK1A
Version History & Decisions

Version History & Decisions

Published version

Published guidance. View the version history for earlier changes.

More public guidance matched to this skill.

Auto language detection returns English only for mixed English/Spanish audioThe `auto` language option picks one predominant language for the whole file, so mixed English/Spanish audio will come back labeled as whichever dominated the samples. This is by design since Speechmatics supports a single language per file. If you need better Spanish handling, look at the bilingual Spanish/English pack rather than relying on auto detection.Read skill →Cartesia instant clone: clip mood carries into the voice, one language per cloneCartesia instant clone: clip mood carries into the voice, one language per clone: For a good Cartesia instant clone, record 10-60 seconds of one speaker in a quiet room, speaking naturally in the mood you want the voice to keep.Read skill →Speechmatics linden-1 diarization only accepts speaker or none; anything else errorsSpeechmatics linden-1 diarization only accepts speaker or none; anything else errors: Check the diarization value you are passing.Read skill →

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Published recentlyPublished Oct 2, 2026. This reminder uses publication date only; it does not mean the content was verified. Review again after Mar 31, 2027.

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