Roman Kennke <roman at kennke.org> writes: > 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 All movies on that page play without having taken any particular precautions in Seamonkey (I dislike Firefox). However, I have ffmpeg and mplayer installed (compiled from source because there aren´t packages for those). I don´t know if any of them are being used by Seamonkey. yum list installed | grep gstream gstreamer.x86_64 0.10.36-7.el7 @base gstreamer-plugins-base.x86_64 0.10.36-10.el7 @base gstreamer-tools.x86_64 0.10.36-7.el7 @base gstreamer1.x86_64 1.10.4-2.el7 @base gstreamer1-plugins-base.x86_64 1.10.4-1.el7 @base Those must have been installed for dependencies; I didn´t install them explicitly. -- "Didn't work" is an error.