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LLMs are not and likely will never be good at translating things as they cannot and likely never will understand context, nor keep up with the way languages both natural and constructed change over time. Please do not use them as you will likely just confuse viewers.
As for programs to do subtitling yourself: https://alternativeto.net/software/subtitle-edit/?license=opensource
EDIT: seems like Whisper might be your best bet, it does speech-to-text + translation via a CLI that can be installed with pip: https://github.com/openai/whisper
Huggingface has loads of models for local speech to text and translation, see https://huggingface.co/docs/transformers/model_doc/speech_to_text
There is probably a nicer UI to use them than python coding, but I don’t know one.
AFAIK, this is the Google translate model that you can deploy locally https://huggingface.co/google/mt5-large
Thank you 🙏
Thank you 🙏
Depends on what language, and what kind of subtitles.