API changes, most recent first:
+2013-06-xx - xxxxxxx - lavc 55.10.0 - avcodec.h
+ Add MPEG-2 AAC profiles
+
+2013-06-xx - xxxxxxx - lavu 52.13.0 - mem.h
+ Add av_realloc_array and av_reallocp_array
+
+2013-05-xx - xxxxxxx - lavfi 3.10.0 - avfilter.h
+ Add support for slice multithreading to lavfi. Filters supporting threading
+ are marked with AVFILTER_FLAG_SLICE_THREADS.
+ New fields AVFilterContext.thread_type, AVFilterGraph.thread_type and
+ AVFilterGraph.nb_threads (accessible directly or through AVOptions) may be
+ used to configure multithreading.
+
+2013-xx-xx - xxxxxxx - lavu 52.12.0 - cpu.h
+ Add av_cpu_count() function for getting the number of logical CPUs.
+
2013-05-xx - xxxxxxx - lavc 55.7.0 - avcodec.h
Add picture_structure to AVCodecParserContext.