since the last major version increase.
The last version increases were:
-libavcodec: 2011-04-18
+libavcodec: 2012-01-27
libavdevice: 2011-04-18
libavfilter: 2011-04-18
-libavformat: 2011-04-18
+libavformat: 2012-01-27
libpostproc: 2011-04-18
libswscale: 2011-06-20
libavutil: 2011-04-18