Hello, I am trying to get MP4/H.264 playback in Firefox to work on my CentOS laptop (for vimeo). I installed the gstreamer plugins as described here: https://wiki.centos.org/TipsAndTricks/MultimediaOnCentOS7 (No, I did not install Flash, VLC and all the other stuff. I only want HTML5 MP4 playback..) I enabled the nux repos. I did install all available gstreamer plugins, i.e. -good -bad -ugly -ffmpeg etc. No success. Has anybody got mp4 playback working? Here's a test page: https://www.quirksmode.org/html5/tests/video.html Help would be appreciated! Best regards, Roman