Comment by this_is_eline

I don't know about 'automatic', but in mpv[1] you have this:

> Ctrl+Shift+Left and Ctrl+Shift+Right

> Adjust subtitle delay so that the next or previous subtitle is displayed now. This is especially useful to sync subtitles to audio.

This works in 9/10 cases. :)

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[1]https://mpv.io/