All modern browsers will play video ( Theora and WebM ) and audio ( Vorbis and MP3 ) files from Wikipedia, no modifications needed.
On older iOS , iPadOS , and macOS devices, software decoding will be used. This might be a bit slow compared to what you are used to on such devices. Internet Explorer is NOT supported.
You can try your player using the Wikimedia Commons Sound and Video files .
To learn how to create video or audio files for Wikipedia and its sister projects, check Wikipedia:Creation and usage of media files .