Diarization

Diarization segments a recording by speaker. It answers “who spoke when”, not “what did they say”; pair it with transcription for both.

const result = await RunAnywhere.diarization.diarize(RunAnywhere.audio.file(path))

Options

Field	Meaning
`threshold`	How different two voices must be to count as separate speakers
`minimumDurationMs`	Ignore segments shorter than this
`mergeGapMs`	Join two segments from one speaker separated by less than this

mergeGapMs is the one to tune. Natural speech has pauses inside a turn, and without merging you get one speaker fragmented into a dozen segments.

Diarization inside transcription

For a transcript labelled by speaker rather than a separate segment list, ask the STT namespace instead:

const transcription = await RunAnywhere.stt.transcribe(audio, {
  diarization: true,
  maxSpeakers: 2,
})

Use the STT route when you want a readable transcript. Use the diarization namespace when you want timing, for example to drive a speaker timeline or to split a recording into per-speaker files.

Splitting a recording

Desktop is the platform where this is worth doing, because you can write the output straight to disk:

import { writeFile } from 'node:fs/promises'

const result = await RunAnywhere.diarization.diarize(RunAnywhere.audio.file(path))
// slice the source audio by each segment's timing and write per-speaker files

Knowing the speaker count helps

maxSpeakers on the STT path, and a sensible threshold here, both improve accuracy a lot when you know how many people are in the room. Diarization over-segments when left to guess. Electron has no streaming diarizer. Diarize a completed recording, or use the STT path with diarization: true for live labelling.

Getting Started

Swift SDK

Kotlin SDK

React Native SDK

Flutter SDK

Web SDK

Electron SDK

Vibe Coding

Options

Diarization inside transcription

Splitting a recording

Knowing the speaker count helps

​Options

​Diarization inside transcription

​Splitting a recording

​Knowing the speaker count helps

Options

Diarization inside transcription

Splitting a recording

Knowing the speaker count helps