API changes, most recent first:
+2012-07-20 - xxxxxxx - lavc 54.43.100
+ Add decode_error_flags field to AVFrame.
+
+2012-07-20 - xxxxxxx - lavf 54.18.100
+ Add avformat_match_stream_specifier() function.
+
2012-07-14 - xxxxxxx - lavc 54.38.100 - avcodec.h
Add metadata to AVFrame, and the accessor functions
av_frame_get_metadata() and av_frame_set_metadata().
2012-03-26 - a67d9cf - lavfi 2.66.100
Add avfilter_fill_frame_from_{audio_,}buffer_ref() functions.
+2012-07-xx - xxxxxxx - lavf 54.13.0 - avformat.h
+ Add AVFMT_FLAG_NOBUFFER for low latency use cases.
+
2012-07-10 - 5fade8a - lavu 51.37.0
Add av_malloc_array() and av_mallocz_array()