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Seems like you could easily do a little bash/python script to chop up the recording and batch process each, then stitch the results together?

Probably, although you could more easily use WhisperX and get the same results twice as fast and without any additional scripting.

Does WhisperX do translation? The repo suggests it's only for TTS, timestamps and diarization.

Yes, just use the "translate" instead of the "transcribe" option.