Thanks!, it works nicely, i was using a minimal image and had to install xfce then edit the media-buster-legacy-rk3328 deb to not ask for armbian-buster-desktop, i also needed mpv-legacy and got it from a github link
so far everything is working good, 4K hevc in kodi is fine but for some reason chromium in chrome://gpu says that video decoding isnt accelerated, only webgl stuff