I get this on ubuntu 16.04 with plasma 5.8 and also on opensuse
tumbleweed with plasma 5.9.2, so it is a general KDE plasma5 problem.
Setting the splash to none solved it for now.
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*** This bug is a duplicate of bug 973014 ***
https://bugs.launchpad.net/bugs/973014
Sorry, the problem isn't solved
I was trying some others videos and some indeed can't be played
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*** This bug is a duplicate of bug 973014 ***
https://bugs.launchpad.net/bugs/973014
Try this:
http://tagavalgal.blogspot.com/2011/11/quicktime-demuxer-not-found-in-ubuntu.html
After executing
mv ~/.gstreamer-0.10/registry*.bin ~/.gstreamer-0.10/registry*.bin.org
the problem was solved
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