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autosubsync-mpv is an automatic subtitle synchronization script for mpv media player. It is without a doubt the fastest way to sync subtitles with just one key press and in just under 3 seconds. It supports switching between alass and ffsubsync, and has a graphical menu that allows you to choose between retiming to audio and retiming to existing subs.
Brought to you by joaquintorres, Bocchio, and tatsumoto.