All of Libav's API changes and changes to the command-line tool (other than renaming them) have been merged by FFmpeg, usually very promptly, and by now a lot o

All of Libav's API changes and changes to the command-line tool (other than renaming them) have been merged by FFmpeg, usually very promptly, and by now a lot of the older pre-Libav APIs have been dropped entirely. The fork has not in any way prevented anyone from benefiting from Libav's work. While the two projects have chosen somewhat different approaches to developing the software, these differences were not what lead to the fork, and neither project particularly resembles pre-fork FFmpeg.