The ff_get_buffer function in libavcodec/utils.c in FFmpeg before 2.8.4 preserves width and height values after a failure, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via a crafted .mov file.
https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html
http://www.securitytracker.com/id/1034539
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00004.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=abee0a1c60612e8638640a8a3738fffb65e16dbf