If you're reading this, FFmpeg developers, please accept my thanks for your work. You have become a "Category Killer"[1] in command-line video tomfoolery.
[1] http://www.catb.org/esr/writings/homesteading/cathedral-baza...
[1] http://www.catb.org/esr/writings/homesteading/cathedral-baza...
libav (no wildcard) is a fork of FFmpeg that is broadly focused on reducing bloat and cleaning up the API. As such, libav tends to add features more slowly, while FFmpeg generally follows all of libav’s new features and bug fixes as well as its own [1]. Debian was on libav for a while but went back to FFmpeg in 2015 [2].
[1] http://blog.pkh.me/p/13-the-ffmpeg-libav-situation.html
[2] http://news.softpedia.com/news/Debian-Moves-to-FFmpeg-and-Dr...
Oh, so were those things called "libav" even before the fork, and were perhaps the origin for the name of the fork libav?