libav-source 4:0.8.3-0ubuntu3 (armhf binary) in ubuntu quantal

 Libav is a complete, cross-platform solution to decode, encode, record,
 convert and stream audio and video.
 .
 This package contains a tarball the source file that were used to produce
 this package, containing all modifications that have been applied inline.
 .
 This package is used as build-dependency for 'libav-extra', which provides
 the "extra" variants of libav.