API changes, most recent first:
+2012-12-20 - xxxxxxx - lavfi 3.28.100 - avfilter.h
+ Add AVFilterLink.channels, avfilter_link_get_channels()
+ and avfilter_ref_get_channels().
+
2012-12-15 - 2ada584d - lavc 54.80.100 - avcodec.h
Add pkt_size field to AVFrame.
2012-03-26 - a67d9cf - lavfi 2.66.100
Add avfilter_fill_frame_from_{audio_,}buffer_ref() functions.
+2012-xx-xx - xxxxxxx - lavu 52.2.1 - avstring.h
+ Add av_basename() and av_dirname().
+
2012-11-10 - 5980f5dd - lavu 52.2.0 - audioconvert.h
Rename audioconvert.h to channel_layout.h. audioconvert.h is now deprecated.