@l33t4opera,many many thanks! It helped. Has appeared tearing (waves when scrolling pages). Is there any hope that in the future the problem will be fixed?

Hello!
Sorry for my English.
Opera 45.0.2539.0 dev. Kde neon (Ubuntu based system).
Browser does not play video (any), and does not play gif animation.
Installed chromium-codecs-ffmpeg-extra from saiarcot895/ppa: chromium-dev, did not help. Tried to shove libffmpeg.so from herecura to /usr/lib/x86_64-linux-gnu/opera-developer/, also did not help. Adbode flash player the latest version is installed.
What to do? Where to dig?
Screenshots: https://s12.postimg.org/dgm9v320t/002.jpg and https://s10.postimg.org/iaujb4jdl/003.jpg