If collected the latest git version, there is nothing surprising. Occasionally something falls off. This is due to the fact that most developers are left to build their own amusement Park with blackjack and hookers — Libav. FFmpeg also merges their code periodically and in this way breaks down.
I recommend to switch to avconv. If you need is ffmpeg, then compile an earlier version of git. Working installation method is described for example here : HOWTO: Install and use the latest FFmpeg and x264