Also interested in this issue. So you need to go to your folder, for example:
/ WordPress / WP-includes / JS / MediaElement /
File name:
MediaElement-and-player.min.js
Ctrl+F and do a search - startVolume
He found me 2 similar results startVolume:0.8; Perhaps for video and a second for audio. Therefore, change it from 0.8 to 1 . Then ctrl + F5 on your page, and we are done! :)
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