If it's similar to the issue with playing videos in Anki 2.1.20+, that happened to be reported recently, when the video window can be closed manually with q or the exit button, in this case there were no sound until Anki is restarted, try to do the following one or two steps. ' note type to something else using Tools - Manage Note Types, e.g. If everything is fine, try to temporarily rename 'movies2anki. If everything is fine, try to enable movies2anki add-on, restart Anki and review a few cards. at first use Tools - Generate Mobile Cards, then disable movies2anki and all other add-ons and restart Anki (or hold down the Shift key while starting Anki), and review a few cards. Maybe try to reproduce it with all add-ons disabled, i.e. without Anki, and this error message couldn't have happened. for a few hardcoded note types, the add-on will try to play the sound using mpv or IINA directly, i.e. But it's strange that you got this error since in this particular case, i.e. In this case, I guess, it's a different error since you were very likely using movies2anki add-on ( ) as I'm not aware of any other add-on mentioning IINA and Anki ships with mpv or mplayer (if you're using alternate Anki version). Sound and video on cards will not function until mpv or mplayer is installed. I got this error, while using IINA (built upon MPV) to watch a movie:

Mplayer osx extended quit unexpectedly