KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Everytime I want to play a video (no matter whether the codec is h.264 or h.265), this happens:
When I play it using VLC, it works just fine. I'm running Arch with all the codecs installed. How do I fix this? Please don't tell me to switch to another video player, if I wanted to, I would have done it already.
Koko is a photo viewer, not a video player. Although it does play some things it's not reliable.
Just to make sure, do you have all the gstreamer stuff installed?