The roq_decode_init function in libavcodec/roqvideodec.c in FFmpeg before 1.1 allows remote attackers to have an unspecified impact via a crafted (1) width or (2) height dimension that is not a multiple of sixteen in id RoQ video data.
http://www.ffmpeg.org/security.html
http://www.debian.org/security/2014/dsa-2855
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=3ae610451170cd5a28b33950006ff0bd23036845