libavformat-dev 4:0.5+svn20090706-2ubuntu2 (amd64 binary) in ubuntu karmic

 This is the demuxer library from the ffmpeg project. It supports most
 existing file formats (AVI, MPEG, OGG, Matroska, ASF...).
 .
 This package contains the header files and static libraries needed to
 compile applications or shared objects that use libavformat.