Is there anyone still working on libav support? It appears to me that transition[1] and stabilisation[2] trackers are stuck for a long time without activity. Missing libav-12 stabilisation means that in several stable packages, USE=libav is already inaccessible without manual unmasking of the use flag. I am not prepared to start reverting upstream commits for <libav-12 support[3].
If this is not going to change, maybe media-video/libav should be dropped to ~arch. This is still better than dropping support per-package or plastering package.use.stable.mask with libav entries. [1] https://bugs.gentoo.org/show_bug.cgi?id=libav-12 [2] https://bugs.gentoo.org/617508 [3] https://bugs.gentoo.org/665518