Whisper-timestamped does not use specified CPU cores

[qinidema]

When I ran whisper-timestamped with --threads N or --threads 0 parameter on my CPU-only system the specified number of threads gets created but not used afterwards (only one core is loaded as per htop). Interestingly this behaviour is not observed when I run the "original" whisper, i.e. it uses (and loads) all the cores properly. That leads whisper-timestamped to work literally forever using one core opposed to some reasonable time with raw whisper.

OS: Arch Linux
CPU: AMD EPYC 7B12 x 2
Python version: 3.12.6
Whisper-timestamped version: 1.15.4
Whisper version: 20240927

Test whisper-timestamped commandline (only 1 core is used):
whisper_timestamped --model large-v3 --device cpu --task transcribe --language English --vad True --verbose True --accurate /tmp/test.mp3

Test whisper commandline (all non-logical cores are used, as expected):
whisper --model large-v3 --device cpu --task transcribe --language English --verbose True --word_timestamps True --highlight_words True /tmp/test.mp3

I can attach the screenshots of htop if needed.