Mime type Issue

Hello,

I’m using the plugin mediaelement.js to show a mp4 video..It worked fine on PC and mobile..But on Mac it didn’t work when we try to see it at Firefox..It just say that the error was a mime type video is not found…

Any idea on how to solve this?

https://www.ads-software.com/plugins/media-element-html5-video-and-audio-player/