How could I play av1 encoded videos with these conditions in Ubuntu 18.04?

I have read this and this but still I couldn't play av1 encoded videos truely. Audio streams play correctly but videos are not.

I have installed apt package manager vlc version vetinari 3.0.8 and it shows this error:

main decoder error: Codec `av01' (AOMedia's AV1 Video) is not supported.

After it i have remove apt's vlc and install snap vlc but when I play an av1 encoded video my system crahses and none of tty's doesn't work. I forced to reboot my system. How can I play av1 codecs with vlc or some other stuff?

Ubuntu 18.04.3 LTS

vlc vetinari 3.0.8

firefox 72.0.1

gpu driver radeon

mesa-va-drivers is installed.