· "Libx265 video compressor not supported" when I want to process my project in MP4 in 4K.

Trying to solve these errors, I performed the following actions, but they did not work:
In Konsole I executed drakrpm-edit-media. There I marked "Tainted Release" as Enabled. In Install applications, I selected "All",
making sure I was not only in "Packages with graphical interface". In the search engine I wrote x264 and 5 packages appeared. I marked them all and installed. But as I said, this has not worked.
How can I finish my projects in an MP4 file?