SOLVED: Playing .webm on Google TV (Sony)

[Kotor1984]

Yes, that's it.

I added this on the LXC configuration:

lxc.hook.pre-start: sh -c "chown 0:44 /dev/dri/renderD128"

That set the correct group during restart of the system:

root@jellyfin:~# ls -l /dev/dri
total 0
drwxrwxrwx 2 root root        80 Oct  3 16:15 by-path
crwxrwxrwx 1 root video 226,  0 Oct  3 16:15 card0
crwxrwxrwx 1 root video 226, 128 Oct  3 16:15 renderD128
root@jellyfin:~#

Issue is fixed :)