File list of package libavformat-dev in bullseye of architecture amd64
/usr/include/x86_64-linux-gnu/libavformat/avformat.h /usr/include/x86_64-linux-gnu/libavformat/avio.h /usr/include/x86_64-linux-gnu/libavformat/version.h /usr/lib/x86_64-linux-gnu/libavformat.a /usr/lib/x86_64-linux-gnu/libavformat.so /usr/lib/x86_64-linux-gnu/pkgconfig/libavformat.pc /usr/share/doc/libavformat-dev/changelog.Debian.gz /usr/share/doc/libavformat-dev/changelog.gz /usr/share/doc/libavformat-dev/copyright