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Never assume the API of libav* to be stable unless at least 1 week has passed since
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the last major version increase.
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The last version increases were:
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libavcodec:  ?
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libavdevice: ?
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libavfilter: 2009-10-18
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libavformat: ?
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libpostproc: ?
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libswscale:  ?
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libavutil:   2009-03-08
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API changes, most recent first:
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2010-07-08 - r24101 - lavu 50.21.0 - pixdesc.h
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  Rename read/write_line() to av_read/write_image_line().
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2010-07-07 - r24091 - lavfi 1.21.0 - avfilter_copy_picref_props()
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  Add  avfilter_copy_picref_props().
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2010-07-03 - r24021 - lavc 52.79.0
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  Added FF_COMPLIANCE_UNOFFICIAL and changed all instances of FF_COMPLIANCE_INOFFICIAL to use FF_COMPLIANCE_UNOFFICIAL
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2010-07-02 - r23985 - lavu 50.20.0 - lfg.h
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  Export av_lfg_init(), av_lfg_get(), av_mlfg_get(), and av_bmg_get() through
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  lfg.h.
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2010-06-28 - r23835 - lavfi 1.20.1 - av_parse_color()
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  Extend av_parse_color() syntax, make it accept an alpha value specifier and
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  set the alpha value to 255 by default.
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2010-06-22 - r23706 - lavf 52.71.0 - URLProtocol.priv_data_size, priv_data_class
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  Add priv_data_size and priv_data_class to URLProtocol
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2010-06-22 - r23704 - lavf 52.70.0 - url_alloc(), url_connect()
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  Add url_alloc() and url_connect()
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2010-06-22 - r23702 - lavf 52.69.0 - av_register_protocol2
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  Add av_register_protocol2(), deprecating av_register_protocol()
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2010-06-09 - r23551 - lavu 50.19.0 - av_compare_mod()
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  Add av_compare_mod() to libavutil/mathematics.h.
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2010-06-05 - r23485 - lavu 50.18.0 - eval API
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  Make the eval API public.
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2010-06-04 - r23461 - lavu 50.17.0 - AV_BASE64_SIZE
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  Add AV_BASE64_SIZE() macro.
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2010-06-02 - r23421 - lavc 52.73.0 - av_get_codec_tag_string
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  Add av_get_codec_tag_string().
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2010-06-01 - r31301 - lsws 0.11.0 - convertPalette API
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  Add sws_convertPalette8ToPacked32 and sws_convertPalette8ToPacked24
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2010-05-26 - r23334 - lavc 52.72.0 - CODEC_CAP_EXPERIMENTAL
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  Add CODEC_CAP_EXPERIMENTAL flag.
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2010-05-23 - r23255 - lavu 50.16.0 - av_get_random_seed
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  Add av_get_random_seed()
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2010-05-18 - r23161 - lavf 52.63.0 - AVFMT_FLAG_RTP_HINT
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  Add AVFMT_FLAG_RTP_HINT as possible value for AVFormatContext.flags
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2010-05-09 - r23066 - lavfi 1.20.0 - AVFilterPicRef
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  Add interlaced and top_field_first fields to AVFilterPicRef.
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2010-05-01 - r23002 - lavf 52.62.0 - probe function
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  Add av_probe_input_format2 to API, it allows ignoring probe
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  results below given score and returns the actual probe score.
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2010-04-01 - r22806 - lavf 52.61.0 - metadata API
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  Add a flag for av_metadata_set2() to disable overwriting of
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  existing tags.
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2010-04-01 - r22753 - lavc 52.66.0
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  Add avcodec_get_edge_width()
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2010-03-31 - r22750 - lavc 52.65.0
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  Add avcodec_copy_context().
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2010-03-31 - r22748 - lavf 52.60.0 - av_match_ext()
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  Make av_match_ext() public.
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2010-03-31 - r22736 - lavu 50.14.0 - AVMediaType
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  Move AVMediaType enum from libavcodec to libavutil.
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2010-03-31 - r22735 - lavc 52.64.0 - AVMediaType
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  Define AVMediaType enum, and use it instead of enum CodecType, which
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  is deprecated and will be dropped at the next major bump.
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2010-03-25 - r22684 - lavu 50.13.0 - av_strerror()
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  Implement av_strerror().
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2010-03-23 - r22649 - lavc 52.60.0 - av_dct_init()
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  Support DCT-I and DST-I
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2010-03-15 - r22540 - lavf 52.56.0 - AVFormatContext.start_time_realtime
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  Add AVFormatContext.start_time_realtime field.
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2010-03-13 - r22506 - lavfi 1.18.0 - AVFilterPicRef.pos
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  Add AVFilterPicRef.pos field.
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2010-03-13 - r22501 - lavu 50.12.0 - error.h
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  Move error code definitions from libavcodec/avcodec.h to
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  the new public header libavutil/error.h.
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2010-03-07 - r22291 - lavc 52.56.0 - avfft.h
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  Add public FFT interface.
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2010-03-06 - r22251 - lavu 50.11.0 - av_stristr()
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  Add av_stristr().
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2010-03-03 - r22174 - lavu 50.10.0 - av_tree_enumerate()
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  Add av_tree_enumerate().
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2010-02-07 - r21673 - lavu 50.9.0 - av_compare_ts()
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  Add av_compare_ts().
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2010-02-05 - r30513 - lsws 0.10.0 - sws_getCoefficients()
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  Add sws_getCoefficients().
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2010-02-01 - r21587 - lavf 52.50.0 - metadata API
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  Add a list of generic tag names, change 'author' -> 'artist',
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  'year' -> 'date'.
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2010-01-30 - r21545 - lavu 50.8.0 - av_get_pix_fmt()
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  Add av_get_pix_fmt().
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2010-01-21 - r30381 - lsws 0.9.0 - sws_scale
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  Change constness attributes of sws_scale() parameters.
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2010-01-10 - r21121 - lavfi 1.15.0 - avfilter_graph_config_links()
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  Add a log_ctx parameter to avfilter_graph_config_links().
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2010-01-07 - r30236 - lsws 0.8.0 - sws_isSupported{In,Out}put
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  Add sws_isSupportedInput() and sws_isSupportedOutput() functions.
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2010-01-06 - r21035 - lavfi 1.14.0 - avfilter_add_colorspace()
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  Change the avfilter_add_colorspace() signature, make it accept an
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  (AVFilterFormats **) rather than an (AVFilterFormats *) as before.
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2010-01-03 - r21007 - lavfi 1.13.0 - avfilter_add_colorspace()
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  Add avfilter_add_colorspace().
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2010-01-02 - r20998 - lavf 52.46.0 - av_match_ext()
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  Add av_match_ext(), it should be used in place of match_ext().
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2010-01-01 - r20991 - lavf 52.45.0 - av_guess_format()
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  Add av_guess_format(), it should be used in place of guess_format().
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2009-12-13 - r20834 - lavf 52.43.0 - metadata API
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  Add av_metadata_set2(), AV_METADATA_DONT_STRDUP_KEY and AV_METADATA_DONT_STRDUP_VAL.
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2009-12-13 - r20829 - lavu 50.7.0 - avstring.h API
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  Add av_d2str().
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2009-12-13 - r20826 - lavc 52.42.0 - AVStream
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  Add avg_frame_rate.
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2009-12-12 - r20808 - lavu 50.6.0 - av_bmg_next()
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  Introduce the av_bmg_next() function.
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2009-12-05 - r20734 - lavfi 1.12.0 - avfilter_draw_slice()
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  Add a slice_dir parameter to avfilter_draw_slice().
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2009-11-26 - r20611 - lavfi 1.11.0 - AVFilter
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  Remove the next field from AVFilter, this is not anymore required.
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2009-11-25 - r20607 - lavfi 1.10.0 - avfilter_next()
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  Introduce the avfilter_next() function.
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2009-11-25 - r20605 - lavfi 1.9.0 - avfilter_register()
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  Change the signature of avfilter_register() to make it return an
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  int. This is required since now the registration operation may fail.
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2009-11-25 - r20603 - lavu 50.5.0 - pixdesc.h API
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  Make the pixdesc.h API public.
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2009-10-27 - r20385 - lavfi 1.5.0 - AVFilter.next
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  Add a next field to AVFilter, this is used for simplifying the
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  registration and management of the registered filters.
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2009-10-23 - r20356 - lavfi 1.4.1 - AVFilter.description
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  Add a description field to AVFilter.
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2009-10-19 - r20302 - lavfi 1.3.0 - avfilter_make_format_list()
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  Change the interface of avfilter_make_format_list() from
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  avfilter_make_format_list(int n, ...) to
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  avfilter_make_format_list(enum PixelFormat *pix_fmts).
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2009-10-18 - r20272 - lavfi 1.0.0 - avfilter_get_video_buffer()
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  Make avfilter_get_video_buffer() recursive and add the w and h
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  parameters to it.
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2009-10-07 - r20189 - lavfi 0.5.1 - AVFilterPic
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  Add w and h fields to AVFilterPic.
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2009-06-22 - r19250 - lavf 52.34.1 - AVFormatContext.packet_size
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  This is now an unsigned int instead of a signed int.
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2009-06-19 - r19222 - lavc 52.32.0 - AVSubtitle.pts
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  Add a pts field to AVSubtitle which gives the subtitle packet pts
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  in AV_TIME_BASE. Some subtitle de-/encoders (e.g. XSUB) will
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  not work right without this.
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2009-06-03 - r19078 - lavc 52.30.2 - AV_PKT_FLAG_KEY
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  PKT_FLAG_KEY has been deprecated and will be dropped at the next
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  major version. Use AV_PKT_FLAG_KEY instead.
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2009-06-01 - r19025 - lavc 52.30.0 - av_lockmgr_register()
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  av_lockmgr_register() can be used to register a callback function
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  that lavc (and in the future, libraries that depend on lavc) can use
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  to implement mutexes. The application should provide a callback function
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  that implements the AV_LOCK_* operations described in avcodec.h.
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  When the lock manager is registered, FFmpeg is guaranteed to behave
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  correctly in a multi-threaded application.
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2009-04-30 - r18719 - lavc 52.28.0 - av_free_packet
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  av_free_packet() is no longer an inline function. It is now exported.
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2009-04-11 - r18431 - lavc 52.25.0 - deprecate av_destruct_packet_nofree
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  Please use NULL instead. This has been supported since r16506
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  (lavf > 52.23.1, lavc > 52.10.0).
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2009-04-07 - r18351 - lavc 52.23.0 - avcodec_decode_video/audio/subtitle
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  The old decoding functions are deprecated, all new code should use the
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  new functions avcodec_decode_video2(), avcodec_decode_audio3() and
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  avcodec_decode_subtitle2(). These new functions take an AVPacket *pkt
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  argument instead of a const uint8_t *buf / int buf_size pair.
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2009-04-03 - r18321 - lavu 50.3.0 - av_fifo_space
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  Introduce the av_fifo_space() function.
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2009-04-02 - r18317 - lavc 52.23.0 - AVPacket
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  Move AVPacket declaration from libavformat/avformat.h to
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  libavcodec/avcodec.h.
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2009-03-22 - r18163 - lavu 50.2.0 - RGB32 pixel formats
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  Convert the pixel formats PIX_FMT_ARGB, PIX_FMT_RGBA, PIX_FMT_ABGR,
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  PIX_FMT_BGRA, which were defined as macros, into enum PixelFormat values.
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  Conversely PIX_FMT_RGB32, PIX_FMT_RGB32_1, PIX_FMT_BGR32 and
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  PIX_FMT_BGR32_1 are now macros.
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  avcodec_get_pix_fmt() now recognizes the "rgb32" and "bgr32" aliases.
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  Re-sort the enum PixelFormat list accordingly.
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  This change breaks API/ABI backward compatibility.
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2009-03-22 - r18133 - lavu 50.1.0 - PIX_FMT_RGB5X5 endian variants
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  Add the enum PixelFormat values:
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  PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
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  PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, PIX_FMT_BGR555BE, PIX_FMT_BGR555LE.
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2009-03-21 - r18116 - lavu 50.0.0  - av_random*
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  The Mersenne Twister PRNG implemented through the av_random* functions
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  was removed. Use the lagged Fibonacci PRNG through the av_lfg* functions
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  instead.
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2009-03-08 - r17869 - lavu 50.0.0  - AVFifoBuffer
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  av_fifo_init, av_fifo_read, av_fifo_write and av_fifo_realloc were dropped
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  and replaced by av_fifo_alloc, av_fifo_generic_read, av_fifo_generic_write
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  and av_fifo_realloc2.
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  In addition, the order of the function arguments of av_fifo_generic_read
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  was changed to match av_fifo_generic_write.
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  The AVFifoBuffer/struct AVFifoBuffer may only be used in an opaque way by
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  applications, they may not use sizeof() or directly access members.
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2009-03-01 - r17682 - lavf 52.31.0 - Generic metadata API
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  Introduce a new metadata API (see av_metadata_get() and friends).
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  The old API is now deprecated and should not be used anymore. This especially
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  includes the following structure fields:
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    - AVFormatContext.title
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    - AVFormatContext.author
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    - AVFormatContext.copyright
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    - AVFormatContext.comment
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    - AVFormatContext.album
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    - AVFormatContext.year
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    - AVFormatContext.track
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    - AVFormatContext.genre
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    - AVStream.language
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    - AVStream.filename
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    - AVProgram.provider_name
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    - AVProgram.name
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    - AVChapter.title