Issues opening citra

Issue:
downloaded citra on my macbook and proceeded to try and open the application, only this window pops up and i cant do anything

System Information

In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.

thanks i will begin to do this asap

how do i install the missing library?

install brew (you can find tutorials online) afterwards open the terminal and type brew install ffmpeg.

thanks thats got it open, now just need to get a game see if it works