> It's not available in WebM, and Fedora can't ship with MP4 support. If you add the rpmfusion repository[1] (only the free one, of course) you'll be able to install free software that Red Hat can't ship due to patent restrictions. I'm not sure whether or not this includes media players built with mp4 support, but at minimum you should be able to install ffmpeg, download the video, and convert it to webm.
$ wget http://www.freedomdecrypted.com/public_html/shows/2018-06-12%2021-30-06.mp4 $ ffmpeg -i 2018-06-12\ 21-30-06.mp4 2018-06-12\ 21-30-06.webm [1] https://rpmfusion.org/Configuration
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