mpv-player/mpv — pull request #388 by viveksjain (2013-12-01 05:27:24+00:00)
Title: Register both alt keys on Mac

Previously only the left alt would count as the alt modifier key to mpv.

If the old behavior was intentional, I would love to know the reasoning behind it.

WARNING: I have not tested this change, although I'm pretty sure it will work. Compiling mpv is too much work to do right now. :)