Hello,
According to Tom 'spot' Callaway it's possible to build a chromium-libs-media-freeworld package to make available proprietary codecs to chromium. It will be great if that can be add to RPMFusion !
https://www.reddit.com/r/Fedora/comments/5buozn/how_to_enable_mse_h264_in_chromium/
https://www.reddit.com/r/Fedora/comments/5buozn/how_to_enable_mse_h264_in_chromium/d9x3lap/
Thanks !