The remote Debian host is missing a security-related update.
Several security issues have been corrected in multiple demuxers and decoders of the libav multimedia library. A full list of the changes is available at https://git.libav.org/?p=libav.git;a=blob;f=Changelog;hb=refs/tags/v11 .4
Upgrade the libav packages. For the stable distribution (jessie), these problems have been fixed in version 6:11.4-1~deb8u1.