[ehsankia]

That's a great tip in general, but I assume the biggest benefit here really is being able to pause, rewind and seek around while staying in sync, which would be much harder for some external timer.

[ashton314]

Oh for sure. Though, it would not surprise me if someone has come up with some way to control video playback through Emacs.

[andreareina]

EMMS[1] might be part of the solution

[1] https://www.emacswiki.org/emacs/EMMS