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fix (mistral-ai): add flexibility for timestamps #4404

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Merged
tinalenguyen merged 3 commits into from
Dec 27, 2025
Merged

fix (mistral-ai): add flexibility for timestamps #4404

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350d0f0
fix
tinalenguyen Dec 27, 2025
58c24c4
type check
tinalenguyen Dec 27, 2025
7e3478d
fix
tinalenguyen Dec 27, 2025
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12 changes: 5 additions & 7 deletions livekit-plugins/livekit-plugins-mistralai/livekit/plugins/mistralai/stt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,14 +40,14 @@
@dataclass
class _STTOptions:
model: STTModels | str
language: str
language: str | None


class STT(stt.STT):
def __init__(
self,
*,
language: str = "en",
language: str | None = "en",
model: STTModels | str = "voxtral-mini-latest",
api_key: NotGivenOr[str] = NOT_GIVEN,
client: Mistral | None = None,
Expand All @@ -56,7 +56,7 @@ def __init__(
Create a new instance of MistralAI STT.

Args:
language: The language code to use for transcription (e.g., "en" for English).
language: The language code to use for transcription (e.g., "en" for English). Segment timestamps will only be available if set to None.
model: The MistralAI model to use for transcription, default is voxtral-mini-latest.
api_key: Your MistralAI API key. If not provided, will use the MISTRAL_API_KEY environment variable.
client: Optional pre-configured MistralAI client instance.
Expand All @@ -66,7 +66,6 @@ def __init__(
capabilities=stt.STTCapabilities(
streaming=False,
interim_results=False,
# timestamp granularity doesn't seem to work
aligned_transcript=False,
)
)
Expand Down Expand Up @@ -123,16 +122,15 @@ async def _recognize_impl(
model=self._opts.model,
file={"content": data, "file_name": "audio.wav"},
language=self._opts.language if self._opts.language else None,
# for some reason, it doesn't return any segments even if we ask for them
timestamp_granularities=["segment"],
timestamp_granularities=None if self._opts.language else ["segment"],
)

return stt.SpeechEvent(
type=stt.SpeechEventType.FINAL_TRANSCRIPT,
alternatives=[
stt.SpeechData(
text=resp.text,
language=self._opts.language,
language=self._opts.language if self._opts.language else "",
start_time=resp.segments[0].start if resp.segments else 0,
end_time=resp.segments[-1].end if resp.segments else 0,
words=[
Expand Down