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Fedora as usual is bad with codec support. to enable twitter video playback and to fix "The media could not be played" in vivaldi in fedora; Download and extract libffmpeg.so from chromium-codecs-ffmpeg-extra ubuntu package (see the latest ones at the bottom of the page; currently it is chromium-codecs-ffmpeg-extra_56.0.2924.76-0ubuntu0.16.10.1335_amd64.deb )

http://security.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/

cd Downloads (if the deb file is downloaded using vivaldi)
ar x chromium-codecs-ffmpeg-extra_56.0.2924.76-0ubuntu0.16.10.1335_amd64.deb
tar -hxvf data.tar.xz
sudo cp usr/lib/chromium-browser/libffmpeg.so /opt/vivaldi/lib ; #replace the existing libffmpeg.so

restart vivaldi, now videos will play in twitter media; also check html5test.com it should say

H.264 support Yes