Maintainers for libavformat-dev are Debian Multimedia Maintainers <debian-multimedia@lists.debian.org>.
You may want to refer to the following packages that are part of the same source: ffmpeg, ffmpeg-doc, libavcodec-dev, libavcodec-extra, libavcodec-extra58, libavcodec-extra59, libavcodec-extra61, libavcodec-extra62, libavcodec58, libavcodec59, libavcodec61, libavcodec62, libavdevice-dev, libavdevice58, libavdevice59, libavdevice61, libavdevice62, libavfilter-dev, libavfilter-extra, libavfilter-extra10, libavfilter-extra11, libavfilter-extra7, libavfilter-extra8, libavfilter10, libavfilter11, libavfilter7, libavfilter8, libavformat-extra, libavformat-extra59, libavformat-extra61, libavformat-extra62, libavformat58, libavformat59, libavformat61, libavformat62, libavresample-dev, libavresample4, libavutil-dev, libavutil56, libavutil57, libavutil59, libavutil60, libpostproc-dev, libpostproc55, libpostproc56, libpostproc58, libswresample-dev, libswresample3, libswresample4, libswresample5, libswresample6, libswscale-dev, libswscale5, libswscale6, libswscale8, libswscale9.
You might like to refer to the libavformat-dev package page, to the Package Tracking System, or to the source package src:ffmpeg's bug page.
If you find a bug not listed here, please report it.