The last version increases were:
libavcodec: 2012-01-27
libavdevice: 2011-04-18
-libavfilter: 2011-04-18
+libavfilter: 2012-06-22
libavformat: 2012-01-27
libavresample: 2012-04-24
libpostproc: 2011-04-18
API changes, most recent first:
-2012-06-04 - xxxxxxx - lafi 2.78.100
- Add avfilter_default_filter_name() function in avfilter.h.
+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().
+
+2012-07-10 - xxxxxxx - lavc 54.33.100
+ Add av_fast_padded_mallocz().
+
+2012-07-10 - xxxxxxx - lavfi 3.2.0 - avfilter.h
+ Add init_opaque() callback to AVFilter struct.
+
+2012-06-26 - xxxxxxx - lavu 51.63.100 - imgutils.h
+ Add functions to libavutil/imgutils.h:
+ av_image_get_buffer_size()
+ av_image_fill_arrays()
+ av_image_copy_to_buffer()
+
+2012-06-24 - xxxxxxx - lavu 51.62.100 - version.h
+ version moved from avutil.h to version.h
+
+2012-04-11 - xxxxxxx - lavu 51.58.100 - error.h
+ Add av_make_error_string() and av_err2str() utilities to
+ libavutil/error.h.
+
+2012-06-05 - xxxxxxx - lavc 54.24.100
+ Add pkt_duration field to AVFrame.
2012-05-24 - xxxxxxx - lavu 51.54.100
Move AVPALETTE_SIZE and AVPALETTE_COUNT macros from
2012-03-26 - a67d9cf - lavfi 2.66.100
Add avfilter_fill_frame_from_{audio_,}buffer_ref() functions.
-2012-05-25 - e0e0793 - lavu 51.31.0 - opt.h
+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()
+
+2012-06-22 - d3d3a32 - lavu 51.34.0
+ Add av_usleep()
+
+2012-06-20 - ae0a301 - lavu 51.33.0
+ Move av_gettime() to libavutil, add libavutil/time.h
+
+2012-06-09 - 3971be0 - lavr 0.0.3
+ Add a parameter to avresample_build_matrix() for Dolby/DPLII downmixing.
+
+2012-06-12 - 9baeff9 - lavfi 2.23.0 - avfilter.h
+ Add AVFilterContext.nb_inputs/outputs. Deprecate
+ AVFilterContext.input/output_count.
+
+2012-06-12 - 84b9fbe - lavfi 2.22.0 - avfilter.h
+ Add avfilter_pad_get_type() and avfilter_pad_get_name(). Those
+ should now be used instead of accessing AVFilterPad members
+ directly.
+
+2012-06-12 - b0f0dfc - lavu 51.32.0 - audioconvert.h
+ Add av_get_channel_layout_channel_index(), av_get_channel_name()
+ and av_channel_layout_extract_channel().
+
+2012-05-25 - 154486f - lavu 51.31.0 - opt.h
Add av_opt_set_bin()
2012-05-15 - lavfi 2.17.0