faster_whisper_backend: VadOptions `threshold` param renamed to `onset` in faster-whisper 1.1.0

[RohanMuppa]

Bug

faster_whisper_backend.py line 79 sets:

self.vad_parameters = vad_parameters or {"threshold": 0.5}

But faster-whisper==1.1.0 (which is pinned in setup.py) renamed VadOptions.threshold to VadOptions.onset. This causes every transcription attempt to fail with:

VadOptions.__init__() got an unexpected keyword argument 'threshold'

The error repeats on every audio chunk, so no transcription output is ever produced.

Fix

Change "threshold" to "onset":

self.vad_parameters = vad_parameters or {"onset": 0.5}

Steps to reproduce

pip install whisper-live  # installs faster-whisper==1.1.0
python3 run_server.py --port 9090 --backend faster_whisper
# connect any client — server logs the error on every audio chunk