Hey I just wanted to report that mpv has a unresolved dependency, I am using the unstable branch.
sudo pacman -S celluloid
resolving dependencies...
warning: cannot resolve "libplacebo.so=349-64", a dependency of "mpv"
warning: cannot resolve "mpv", a dependency of "celluloid"
:: The following package cannot be upgraded due to unresolvable dependencies:
celluloid
:: Do you want to skip the above package for this upgrade? [y/N]