libavcodec-dev 4:0.6.4-0ubuntu0.11.04.1 (i386 binary) in ubuntu natty

 This is the codec library from Libav. It supports most existing
 encoding formats (MPEG, DivX, MPEG4, AC3, DV...).
 .
 This package contains the header files and static libraries needed to
 compile applications or shared objects that use libavcodec.