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 .12
Upgrade the libav packages. For the oldstable distribution (jessie), this problem has been fixed in version 6:11.12-1~deb8u1.