---
license: mit
tags: [voice-activity-detection, silero, onnx, betterflow]
---
# betterflow — Silero VAD

`silero_vad.onnx` as distributed in the [k2-fsa/sherpa-onnx](https://github.com/k2-fsa/sherpa-onnx)
`asr-models` release. Mirrored here **only** so betterflow can pin an immutable revision and verify a
sha256 at install time; the weights are unmodified.

Used to cut a dictated utterance into VAD-endpointed phrases so each decodes independently, which
lets the first text reach the user without waiting for the whole decode.

- ONNX input `x` is fixed at shape **[1, 512]** — 512 samples at 16 kHz, per call. Not configurable.
- Self-describes as silero-vad **v4** exported by k2-fsa, 16 kHz branch only.
- sha256: `9e2449e1087496d8d4caba907f23e0bd3f78d91fa552479bb9c23ac09cbb1fd6`
- Upstream: https://github.com/snakers4/silero-vad (MIT)