libavcodec-dev 6:11.4-2 (armhf binary) in ubuntu wily

 Libav is a complete, cross-platform solution to decode, encode, record,
 convert and stream audio and video.
 .
 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.