The filter_frame function in libavfilter/vf_fps.c in FFmpeg before 2.1 does not properly ensure the availability of FIFO content, which allows remote attackers to cause a denial of service (double free) or possibly have unspecified other impact via crafted data.
https://trac.ffmpeg.org/ticket/2905
https://security.gentoo.org/glsa/201603-06
https://github.com/FFmpeg/FFmpeg/commit/cdd5df8189ff1537f7abe8defe971f80602cc2d2
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-6822
http://openwall.com/lists/oss-security/2013/12/08/3