API changes, most recent first:
+2011-12-25 - lavfi 2.14.0
+ e1d9dbf Add a new installed header - buffersrc.h
+ It contains a new function av_buffersrc_buffer() that allows passing
+ frames to the 'buffer' filter, but unlike av_vsrc_buffer_add_frame()
+ it allows for direct rendering.
+ 1c9e340 Add avfilter_copy_frame_props() for copying properties from
+ AVFrame to AVFilterBufferRef.
+
+2011-12-25 - lavc 53.31.0
+ Add the following new fields to AVFrame:
+ b58dbb5 sample_aspect_ratio
+ 3a2ddf7 width, height
+ 8a4a5f6 format
+
+2011-12-18 - 8400b12 - lavc 53.28.1
+ Deprecate AVFrame.age. The field is unused.
+
+2011-xx-xx - xxxxxxx - lavf 53.17.0
+ Add avformat_open_input().
+ Deprecate av_close_input_file() and av_close_input_stream().
+
+2011-xx-xx - xxxxxxx - lavc 53.25.0
+ Add nb_samples and extended_data fields to AVFrame.
+ Deprecate AVCODEC_MAX_AUDIO_FRAME_SIZE.
+ Deprecate avcodec_decode_audio3() in favor of avcodec_decode_audio4().
+ avcodec_decode_audio4() writes output samples to an AVFrame, which allows
+ audio decoders to use get_buffer().
+
+2011-xx-xx - xxxxxxx - lavc 53.24.0
+ Change AVFrame.data[4]/base[4]/linesize[4]/error[4] to [8] at next major bump.
+ Change AVPicture.data[4]/linesize[4] to [8] at next major bump.
+ Change AVCodecContext.error[4] to [8] at next major bump.
+ Add AV_NUM_DATA_POINTERS to simplify the bump transition.
+
+2011-11-23 - bbb46f3 - lavu 51.18.0
+ Add av_samples_get_buffer_size(), av_samples_fill_arrays(), and
+ av_samples_alloc(), to samplefmt.h.
+
+2011-11-23 - 8889cc4 - lavu 51.17.0
+ Add planar sample formats and av_sample_fmt_is_planar() to samplefmt.h.
+
+2011-11-19 - f3a29b7 - lavc 53.21.0
+ Move some AVCodecContext fields to a new private struct, AVCodecInternal,
+ which is accessed from a new field, AVCodecContext.internal.
+ - fields moved:
+ AVCodecContext.internal_buffer --> AVCodecInternal.buffer
+ AVCodecContext.internal_buffer_count --> AVCodecInternal.buffer_count
+ AVCodecContext.is_copy --> AVCodecInternal.is_copy
+
+2011-11-16 - 6270671 - lavu 51.16.0
+ Add av_timegm()
+
+2011-11-13 - lavf 53.15.0
+ New interrupt callback API, allowing per-AVFormatContext/AVIOContext
+ interrupt callbacks.
+ 6aa0b98 Add AVIOInterruptCB struct and the interrupt_callback field to
+ AVFormatContext.
+ 1dee0ac Add avio_open2() with additional parameters. Those are
+ an interrupt callback and an options AVDictionary.
+ This will allow passing AVOptions to protocols after lavf
+ 54.0.
+
+2011-11-06 - ba04ecf - lavu 51.14.0
+ Add av_strcasecmp() and av_strncasecmp() to avstring.h.
+
+2011-11-06 - 07b172f - lavu 51.13.0
+ Add av_toupper()/av_tolower()
+
+2011-11-05 - b6d08f4 - lavf 53.13.0
+ Add avformat_network_init()/avformat_network_uninit()
+
+2011-10-27 - 512557b - lavc 53.15.0
+ Remove avcodec_parse_frame.
+ Deprecate AVCodecContext.parse_only and CODEC_CAP_PARSE_ONLY.
+
+2011-10-19 - 569129a - lavf 53.10.0
+ Add avformat_new_stream(). Deprecate av_new_stream().
+
+2011-10-13 - b631fba - lavf 53.9.0
+ Add AVFMT_NO_BYTE_SEEK AVInputFormat flag.
+
+2011-10-12 - lavu 51.12.0
+ AVOptions API rewrite.
+
+ - 145f741 FF_OPT_TYPE* renamed to AV_OPT_TYPE_*
+ - new setting/getting functions with slightly different semantics:
+ dac66da av_set_string3 -> av_opt_set
+ av_set_double -> av_opt_set_double
+ av_set_q -> av_opt_set_q
+ av_set_int -> av_opt_set_int
+
+ 41d9d51 av_get_string -> av_opt_get
+ av_get_double -> av_opt_get_double
+ av_get_q -> av_opt_get_q
+ av_get_int -> av_opt_get_int
+
+ - 8c5dcaa trivial rename av_next_option -> av_opt_next
+ - 641c7af new functions - av_opt_child_next, av_opt_child_class_next
+ and av_opt_find2()
+
2011-09-03 - fb4ca26 - lavc 53.10.0
lavf 53.6.0
lsws 2.1.0