API changes, most recent first:
+2012-02-21 - xxxxxxx - lavc 54.4.100
+ Add av_get_pcm_codec() function.
+
+2012-02-16 - xxxxxxx - libswr 0.7.100
+ Add swr_set_matrix() function.
+
2012-02-09 - xxxxxxx - lavu 51.39.100
Add a new installed header libavutil/timestamp.h with timestamp
utilities.
2012-01-24 - xxxxxxx - lavfi 2.60.100
Add avfilter_graph_dump.
+2012-xx-xx - xxxxxxx - lavc 54.x.x
+ Add duration field to AVCodecParserContext
+
+2012-02-xx - xxxxxxx - lavu 51.23.1 - mathematics.h
+ Add av_rescale_q_rnd()
+
2012-02-xx - xxxxxxx - lavu 51.22.1 - pixdesc.h
Add PIX_FMT_PSEUDOPAL flag.