You will have to ignore deps and upgrade x265 and then rebuild ffmpeg-headless. WARNING: ffmpeg-headless might be broken until you rebuild!
pacman -Sy; pacman -Sd x265; rebuild & reinstall ffmpeg-headless;
(It has always been this way, I've not bumped the pkgrel in the past because it seemed mostly pointless. I can stop depending on specific versions of x265 but this is how it is in the upstream package. I assume there must be a reason for it)
Pinned Comments
dantob commented on 2020-03-28 07:44 (UTC) (edited on 2020-03-28 07:47 (UTC) by dantob)
libva-headlessis recommended overlibvaUpdate system
pacman -Syu --ignore=dav1d(x265,x264 ...etc)Update package ignoring deps
pacman -Sd dav1d(x265,x264 ...etc)then rebuild AUR package against new library