Is there a fast way to find (not necessarily recognize) human speech in an audio file?

Question

I want to write a program that automatically syncs unsynced subtitles. One of the solutions I thought of is to somehow algorythmically find human speech and adjust the subtiles

Answer 1

The technical term for what you are trying to do is called Voice Activity Detection (VAD). There is a python library called SPEAR that does it (among other things).