media-libs/libdv has a gtk1-frontend fetched in with the gtk-flag. I'd suggest to just remove that, because most people probably never use it (it's a lib) and get gtk1 fetched in.
playdv, gtk-1.2 frontend has been dropped in libdv-1.0.0-r2. it looked reasonable as none of rrdeps seemed to use that command, it's a lib like you said.