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Never assume the API of libav* to be stable unless at least 1 month has passed
since the last major version increase or the API was added.
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libavcodec:    2012-01-27
libavdevice:   2011-04-18
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libavformat:   2012-01-27
libavresample: 2012-10-05
libpostproc:   2011-04-18
libswresample: 2011-09-19
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libswscale:    2011-06-20
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libavutil:     2012-10-22
2013-01-17 - a1a707f - lavf 54.61.100
  Add av_codec_get_tag2().

2013-01-01 - 2eb2e17 - lavfi 3.34.100
  Add avfilter_get_audio_buffer_ref_from_arrays_channels.

2012-12-20 - 34de47aa - lavfi 3.29.100 - 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.

2012-11-25 - c70ec631 - lavu 52.9.100 - opt.h
  Add the following convenience functions to opt.h:
   av_opt_get_image_size
   av_opt_get_pixel_fmt
   av_opt_get_sample_fmt
   av_opt_set_image_size
   av_opt_set_pixel_fmt
   av_opt_set_sample_fmt

2012-11-17 - 4cd74c81 - lavu 52.8.100 - bprint.h
  Add av_bprint_strftime().

2012-11-15 - 92648107 - lavu 52.7.100 - opt.h
  Add av_opt_get_key_value().

2012-11-13 - 79456652 - lavfi 3.23.100 - avfilter.h
  Add channels field to AVFilterBufferRefAudioProps.

2012-11-03 - 481fdeee - lavu 52.3.100 - opt.h
  Add AV_OPT_TYPE_SAMPLE_FMT value to AVOptionType enum.

2012-10-21 - 6fb2fd8 - lavc  54.68.100 - avcodec.h
                       lavfi  3.20.100 - avfilter.h
  Add AV_PKT_DATA_STRINGS_METADATA side data type, used to transmit key/value
  strings between AVPacket and AVFrame, and add metadata field to
  AVCodecContext (which shall not be accessed by users; see AVFrame metadata
  instead).

2012-09-27 - a70b493 - lavd 54.3.100 - version.h
  Add LIBAVDEVICE_IDENT symbol.

2012-09-27 - a70b493 - lavfi 3.18.100 - version.h
  Add LIBAVFILTER_IDENT symbol.

2012-09-27 - a70b493 - libswr 0.16.100 - version.h
  Add LIBSWRESAMPLE_VERSION, LIBSWRESAMPLE_BUILD
  and LIBSWRESAMPLE_IDENT symbols.

2012-09-06 - 29e972f - lavu 51.72.100 - parseutils.h
  Add av_small_strptime() time parsing function.

  Can be used as a stripped-down replacement for strptime(), on
  systems which do not support it.

2012-08-25 - 2626cc4 - lavf 54.28.100
  Matroska demuxer now identifies SRT subtitles as AV_CODEC_ID_SUBRIP instead
  of AV_CODEC_ID_TEXT.

2012-08-13 - 5c0d8bc - lavfi 3.8.100 - avfilter.h
  Add avfilter_get_class() function, and priv_class field to AVFilter
  struct.

2012-08-12 - a25346e - lavu 51.69.100 - opt.h
  Add AV_OPT_FLAG_FILTERING_PARAM symbol in opt.h.

2012-07-31 - 23fc4dd - lavc 54.46.100
  Add channels field to AVFrame.

2012-07-30 - f893904 - lavu 51.66.100
  Add av_get_channel_description()
  and av_get_standard_channel_layout() functions.

2012-07-21 - 016a472 - lavc 54.43.100
  Add decode_error_flags field to AVFrame.

2012-07-20 - b062936 - lavf 54.18.100
  Add avformat_match_stream_specifier() function.

2012-07-14 - f49ec1b - 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 - 0e003d8 - lavc 54.33.100
  Add av_fast_padded_mallocz().

2012-07-10 - 21d5609 - lavfi 3.2.0 - avfilter.h
  Add init_opaque() callback to AVFilter struct.

2012-06-26 - e6674e4 - 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 - c41899a - lavu 51.62.100 - version.h
  version moved from avutil.h to version.h

2012-04-11 - 359abb1 - lavu 51.58.100 - error.h
  Add av_make_error_string() and av_err2str() utilities to
  libavutil/error.h.

2012-06-05 - 62b39d4 - lavc 54.24.100
  Add pkt_duration field to AVFrame.

2012-05-24 - f2ee065 - lavu 51.54.100
  Move AVPALETTE_SIZE and AVPALETTE_COUNT macros from
  libavcodec/avcodec.h to libavutil/pixfmt.h.

2012-05-14 - 94a9ac1 - lavf 54.5.100
  Add av_guess_sample_aspect_ratio() function.

2012-04-20 - 65fa7bc - lavfi 2.70.100
  Add avfilter_unref_bufferp() to avfilter.h.

2012-04-13 - 162e400 - lavfi 2.68.100
  Install libavfilter/asrc_abuffer.h public header.

2012-03-26 - a67d9cf - lavfi 2.66.100
  Add avfilter_fill_frame_from_{audio_,}buffer_ref() functions.

2013-xx-xx - xxxxxxx - lavu 52.7.0 - dict.h
  Add av_dict_parse_string() to set multiple key/value pairs at once from a
  string.

2013-01-xx - xxxxxxx - lavu 52.6.0 - avstring.h
  Add av_strnstr()

2013-01-xx - xxxxxxx - lavu 52.5.0 - hmac.h
  Add AVHMAC.

2013-01-13 - xxxxxxx - lavc 54.36.0 - vdpau.h
  Add AVVDPAUContext struct for VDPAU hardware-accelerated decoding.

2013-01-12 - 169fb94 - lavu 52.4.0 - pixdesc.h
  Add AV_PIX_FMT_VDPAU flag.

2013-01-07 - 074a00d - lavr 1.1.0
  Add avresample_set_channel_mapping() for input channel reordering,
  duplication, and silencing.

2012-12-29 - d8fd06c - lavu 52.3.0 - avstring.h
  Add av_basename() and av_dirname().

2012-11-11 - 5980f5d - lavu 52.2.0 - audioconvert.h
  Rename audioconvert.h to channel_layout.h. audioconvert.h is now deprecated.

2012-11-05 - dfde8a3 - lavu 52.1.0 - intmath.h
  Add av_ctz() for trailing zero bit count

2012-10-21 - a893655 - lavu 51.45.0 - error.h
  Add AVERROR_EXPERIMENTAL

2012-10-12 - d2fcb35 - lavu 51.44.0 - pixdesc.h
  Add functions for accessing pixel format descriptors.
  Accessing the av_pix_fmt_descriptors array directly is now
  deprecated.

2012-10-11 - 9a92aea - lavu 51.43.0 - aes.h, md5.h, sha.h, tree.h
  Add functions for allocating the opaque contexts for the algorithms,

2012-10-10 - b522000 - lavf 54.18.0 - avio.h
  Add avio_closep to complement avio_close.

2012-10-08 - 78071a1 - lavu 51.42.0 - pixfmt.h
  Rename PixelFormat to AVPixelFormat and all PIX_FMT_* to AV_PIX_FMT_*.
  To provide backwards compatibility, PixelFormat is now #defined as
  AVPixelFormat.
  Note that this can break user code that includes pixfmt.h and uses the
  'PixelFormat' identifier. Such code should either #undef PixelFormat
  or stop using the PixelFormat name.

2012-10-05 - e7ba5b1 - lavr 1.0.0 - avresample.h
  Data planes parameters to avresample_convert() and
  avresample_read() are now uint8_t** instead of void**.
  Libavresample is now stable.

2012-09-24 - a42aada - lavc 54.28.0 - avcodec.h
  Add avcodec_free_frame(). This function must now
  be used for freeing an AVFrame.

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