VOSK Offline Speech Recognition API

They buried the single-command show-don't-tell quick start examples on their website:

    vosk-transcriber -i test.mp4 -o test.txt
    vosk-transcriber -i test.mp4 -t srt -o test.srt
    vosk-transcriber -l fr -i test.m4a -t srt -o test.srt
    vosk-transcriber --list-languages

https://alphacephei.com/vosk/install#usage-examples

More information on their website:

    1. Supports 20+ languages and dialects - English, Indian English, German, French, Spanish, Portuguese, Chinese, Russian, Turkish, Vietnamese, Italian, Dutch, Catalan, Arabic, Greek, Farsi, Filipino, Ukrainian, Kazakh, Swedish, Japanese, Esperanto, Hindi, Czech, Polish, Uzbek, Korean, Breton, Gujarati. More to come.
    2. Works offline, even on lightweight devices - Raspberry Pi, Android, iOS
    3. Installs with simple `pip3 install vosk`
    4. Portable per-language models are only 50Mb each, but there are much bigger server models available.
    5. Provides streaming API for the best user experience (unlike popular speech-recognition python packages)
    6. There are bindings for different programming languages, too - java/csharp/javascript etc.
    7. Allows quick reconfiguration of vocabulary for best accuracy.
    8. Supports speaker identification beside simple speech recognition.

https://alphacephei.com/vosk/

It's pretty fast and accurate. Should get several times realtime transcription speeds, on CPU using one of the "small" models:

https://alphacephei.com/vosk/models