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    This would appear to depend on some cloud service (unless it’s doing mind blowing fast lip reading or something), but the readme doesn’t have much to say about that.

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      The readthedocs page goes into more detail: http://subliminal.readthedocs.io/en/latest/user/how_it_works.html

      It’s basically searching subtitle repositories, but also does some additional matching to find which subtitle is the best for your query.