Subj. It was in repos once: I have file /var/cache/pacman/pkg/lib32-gst-plugins-base-libs-1.18.4-1-x86_64.pkg.tar.zst
I suggest either removing this optdepend from wine or adding lib32-gst-plugins-base-libs to world repo (64-bit gst-plugins-base-libs is in both world and extra).
UPDATE: temporarily removed optdep from /var/lib/pacman/local/wine-7.2-1/desc so check-link-consistency can proceed past `pacman -Sw`, got 3 errors:
ERR wine 7.2-1 /usr/lib32/wine/i386-unix/winegstreamer.so libgstaudio-1.0.so.0
ERR wine 7.2-1 /usr/lib32/wine/i386-unix/winegstreamer.so libgsttag-1.0.so.0
ERR wine 7.2-1 /usr/lib32/wine/i386-unix/winegstreamer.so libgstvideo-1.0.so.0
So wine DOES depend on that package.
It is available in testing, I am about to move it early to stable. As soon as mirrors syncs it will be available
Everything's ok now, thank you. :)