APIchanges

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.

The last version increases were:
libavcodec:    2013-03-xx
libavdevice:   2013-03-xx
libavfilter:   2013-12-xx
libavformat:   2013-03-xx
libavresample: 2012-10-05
libpostproc:   2011-04-18
libswresample: 2011-09-19
libswscale:    2011-06-20
libavutil:     2012-10-22


API changes, most recent first:

2014-01-19 - xxxxxxx - lavu 52.63.100 - rational.h
  Add av_make_q() function.

2013-12-xx - xxxxxxx - lavu 53.2.0 - frame.h
  Add AV_FRAME_DATA_MATRIXENCODING value to the AVFrameSideDataType enum, which
  identifies AVMatrixEncoding data.

2013-12-xx - xxxxxxx - lavu 53.1.0 - channel_layout.h
  Add values for various Dolby flags to the AVMatrixEncoding enum.

2014-01-04 - xxxxxxx - lavu 52.60.100 - mathematics.h
  Add av_add_stable() function.

2013-12-22 - xxxxxxx - lavu 52.59.100 - avstring.h
  Add av_strnlen() function.

2013-12-xx - xxxxxxx - lavu 52.57.100 - opencl.h
  Add av_opencl_benchmark() function.

2013-11-xx - xxxxxxx - lavu 52.56.100 - ffversion.h
  Moves version.h to libavutil/ffversion.h.
  Install ffversion.h and make it public.

2013-12-xx - xxxxxxx - lavc 55.28.1 - avcodec.h
  av_frame_alloc(), av_frame_unref() and av_frame_free() now can and should be
  used instead of avcodec_alloc_frame(), avcodec_get_frame_defaults() and
  avcodec_free_frame() respectively. The latter three functions are deprecated.

2013-11-xx - xxxxxxx- - lavu 52.20.0 - frame.h
  Add AV_FRAME_DATA_STEREO3D value to the AVFrameSideDataType enum and
  stereo3d.h API, that identify codec-independent stereo3d information.

2013-11-xx - xxxxxxx- - lavu 52.19.0 - frame.h
  Add AV_FRAME_DATA_A53_CC value to the AVFrameSideDataType enum, which
  identifies ATSC A53 Part 4 Closed Captions data.

2013-11-XX - xxxxxxx - lavu 52.54.100 - avstring.h
  Add av_utf8_decode() function.

2013-11-22 - fb7d70c - lavc 55.44.100 - avcodec.h
  Add HEVC profiles

2013-11-xx - xxxxxxx - lavc 55.44.100 - avcodec.h
  Add av_packet_{un,}pack_dictionary()
  Add AV_PKT_METADATA_UPDATE side data type, used to transmit key/value
  strings between a stream and the application.

2013-11-xx - xxxxxxx - lavu 52.18.0 - mem.h
  Move av_fast_malloc() and av_fast_realloc() for libavcodec to libavutil.

2013-10-xx - xxxxxxx - lavc 55.27.0 - avcodec.h
  Deprecate AVCodecContext.error_rate, it is replaced by the 'error_rate'
  private option of the mpegvideo encoder family.

2013-11-xx - xxxxxxx - lavc 55.26.0 - vdpau.h
  Add av_vdpau_get_profile().
  Add av_vdpau_alloc_context(). This function must from now on be
  used for allocating AVVDPAUContext.

2013-11-xx - xxxxxxx - lavc 55.41.100 / 55.25.0 - avcodec.h
                       lavu 52.51.100 - frame.h
  Add ITU-R BT.2020 and other not yet included values to color primaries,
  transfer characteristics and colorspaces.

2013-11-04 - xxxxxxx - lavu 52.50.100 - avutil.h
  Add av_fopen_utf8()

2013-08-xx - xxxxxxx - lavu 52.17.0 - avframe.h
  Add AVFrame.flags and AV_FRAME_FLAG_CORRUPT.

2013-10-27 - xxxxxxx - lavc 55.39.100 - avcodec.h
  Add CODEC_CAP_DELAY support to avcodec_decode_subtitle2.

2013-10-27 - xxxxxxx - lavu 52.48.100 - parseutils.h
  Add av_get_known_color_name().

2013-10-17 - xxxxxxx - lavu 52.47.100 - opt.h
  Add AV_OPT_TYPE_CHANNEL_LAYOUT and channel layout option handlers
  av_opt_get_channel_layout() and av_opt_set_channel_layout().

2013-10-xx - xxxxxxx -libswscale 2.5.101 - options.c
  Change default scaler to bicubic

2013-10-03 - xxxxxxx - lavc 55.34.100 - avcodec.h
  Add av_codec_get_max_lowres()

2013-10-02 - xxxxxxx - lavf 55.19.100 - avformat.h
  Add audio/video/subtitle AVCodec fields to AVFormatContext to force specific
  decoders

2013-08-xx - xxxxxxx - lavfi 3.11.0 - avfilter.h
  Add AVFilterGraph.execute and AVFilterGraph.opaque for custom slice threading
  implementations.

2013-09-21 - xxxxxxx - lavu 52.16.0 - pixfmt.h
  Add interleaved 4:2:2 8/10-bit formats AV_PIX_FMT_NV16 and
  AV_PIX_FMT_NV20.

2013-09-16 - c74c3fb / 3feb3d6 - lavu 52.44.100 / 52.15.0 - mem.h
  Add av_reallocp.

2013-09-04 - 3e1f507 - lavc 55.31.101 - avcodec.h
  avcodec_close() argument can be NULL.

2013-09-04 - 36cd017 - lavf 55.16.101 - avformat.h
  avformat_close_input() argument can be NULL and point on NULL.

2013-08-29 - e31db62 - lavf 55.15.100 - avformat.h
  Add av_format_get_probe_score().

2013-08-15 - 1e0e193 - lsws 2.5.100 -
  Add a sws_dither AVOption, allowing to set the dither algorithm used

2013-08-xx - xxxxxxx - lavc 55.27.100 - vdpau.h
  Add a render2 alternative to the render callback function.

2013-08-xx - xxxxxxx - lavc 55.26.100 - vdpau.h
  Add allocation function for AVVDPAUContext, allowing
  to extend it in the future without breaking ABI/API.

2013-08-10 - 67a580f / 5a9a9d4 - lavc 55.25.100 / 55.16.0 - avcodec.h
  Extend AVPacket API with av_packet_unref, av_packet_ref,
  av_packet_move_ref, av_packet_copy_props, av_packet_free_side_data.

2013-08-05 - 9547e3e / f824535 - lavc 55.22.100 / 55.13.0 - avcodec.h
  Deprecate the bitstream-related members from struct AVVDPAUContext.
  The bistream buffers no longer need to be explicitly freed.

2013-08-05 - 3b805dc / 549294f - lavc 55.21.100 / 55.12.0 - avcodec.h
  Deprecate the CODEC_CAP_HWACCEL_VDPAU codec capability. Use CODEC_CAP_HWACCEL
  and select the AV_PIX_FMT_VDPAU format with get_format() instead.

2013-08-05 - 4ee0984 / a0ad5d0 - lavu 52.41.100 / 52.14.0 - pixfmt.h
  Deprecate AV_PIX_FMT_VDPAU_*. Use AV_PIX_FMT_VDPAU instead.

2013-08-02 - 82fdfe8 / a8b1927 - lavc 55.20.100 / 55.11.0 - avcodec.h
  Add output_picture_number to AVCodecParserContext.

2013-07-23 - abc8110 - lavc 55.19.100 - avcodec.h
  Add avcodec_chroma_pos_to_enum()
  Add avcodec_enum_to_chroma_pos()

2013-07-03 - 838bd73 - lavfi 3.78.100 - avfilter.h
  Deprecate avfilter_graph_parse() in favor of the equivalent
  avfilter_graph_parse_ptr().

2013-06-24 - af5f9c0 / 95d5246 - lavc 55.17.100 / 55.10.0 - avcodec.h
  Add MPEG-2 AAC profiles

2013-06-25 - af5f9c0 / 95d5246 - lavf 55.10.100 - avformat.h
  Add AV_DISPOSITION_* flags to indicate text track kind.

2013-06-15 - 99b8cd0 - lavu 52.36.100
  Add AVRIPEMD:
   av_ripemd_alloc()
   av_ripemd_init()
   av_ripemd_update()
   av_ripemd_final()

2013-06-04 - 30b491f / fc962d4 - lavu 52.35.100 / 52.13.0 - mem.h
  Add av_realloc_array and av_reallocp_array

2013-05-30 - 682b227 - lavu 52.35.100
  Add AVSHA512:
   av_sha512_alloc()
   av_sha512_init()
   av_sha512_update()
   av_sha512_final()

2013-05-24 - 8d4e969 / 129bb23 - lavfi 3.10.0 / 3.70.100 - 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.

2013-05-24 - fe40a9f / 2a6eaea - lavu 52.12.0 / 52.34.100 - cpu.h
  Add av_cpu_count() function for getting the number of logical CPUs.

2013-05-24 - 0c25c39 / b493847 - lavc 55.7.0 / 55.12.100 - avcodec.h
  Add picture_structure to AVCodecParserContext.

2013-05-17 - 3a751ea - lavu 52.33.100 - opt.h
  Add AV_OPT_TYPE_COLOR value to AVOptionType enum.

2013-05-13 - e398416 - lavu 52.31.100 - mem.h
  Add av_dynarray2_add().

2013-05-12 - 1776177 - lavfi 3.65.100
  Add AVFILTER_FLAG_SUPPORT_TIMELINE* filter flags.

2013-04-19 - 380cfce - lavc 55.4.100
  Add AV_CODEC_PROP_TEXT_SUB property for text based subtitles codec.

2013-04-18 - 7c1a002 - lavf 55.3.100
  The matroska demuxer can now output proper verbatim ASS packets. It will
  become the default starting lavf 56.0.100.

2013-04-10 - af0d270 - lavu 25.26.100 - avutil.h,opt.h
  Add av_int_list_length()
  and av_opt_set_int_list().

2013-03-30 - 5c73645 - lavu 52.24.100 - samplefmt.h
  Add av_samples_alloc_array_and_samples().

2013-03-29 - ef7b6b4 - lavf 55.1.100 - avformat.h
  Add av_guess_frame_rate()

2013-03-20 - 8d928a9 - lavu 52.22.100 - opt.h
  Add AV_OPT_TYPE_DURATION value to AVOptionType enum.

2013-03-17 - 7aa9af5 - lavu 52.20.100 - opt.h
  Add AV_OPT_TYPE_VIDEO_RATE value to AVOptionType enum.

2013-03-07 - 9767ec6 - lavu 52.18.100 - avstring.h,bprint.h
  Add av_escape() and av_bprint_escape() API.

2013-02-24 - b59cd08 - lavfi 3.41.100 - buffersink.h
  Add sample_rates field to AVABufferSinkParams.

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 - 96d815fc - 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.

2013-05-15 - ff46809 / e6c4ac7 - lavu 52.32.100 / 52.11.0 - pixdesc.h
  Replace PIX_FMT_* flags with AV_PIX_FMT_FLAG_*.

2013-04-03 - 6fc58a8 / 507b1e4 - lavc 55.7.100 / 55.4.0 - avcodec.h
  Add field_order to AVCodecParserContext.

2013-04-19 - f4b05cd / 5e83d9a - lavc 55.5.100 / 55.2.0 - avcodec.h
  Add CODEC_FLAG_UNALIGNED to allow decoders to produce unaligned output.

2013-04-11 - lavfi 3.53.100 / 3.8.0
  231fd44 / 38f0c07 - Move all content from avfiltergraph.h to avfilter.h. Deprecate
            avfilterhraph.h, user applications should include just avfilter.h
  86070b8 / bc1a985 - Add avfilter_graph_alloc_filter(), deprecate avfilter_open() and
            avfilter_graph_add_filter().
  4fde705 / 1113672 - Add AVFilterContext.graph pointing to the AVFilterGraph that contains the
            filter.
  710b0aa / 48a5ada - Add avfilter_init_str(), deprecate avfilter_init_filter().
  46de9ba / 1ba95a9 - Add avfilter_init_dict().
  16fc24b / 7cdd737 - Add AVFilter.flags field and AVFILTER_FLAG_DYNAMIC_{INPUTS,OUTPUTS} flags.
  f4db6bf / 7e8fe4b - Add avfilter_pad_count() for counting filter inputs/outputs.
  835cc0f / fa2a34c - Add avfilter_next(), deprecate av_filter_next().
            Deprecate avfilter_uninit().

2013-04-09 - lavfi 3.51.100 / 3.7.0 - avfilter.h
  0594ef0 / b439c99 - Add AVFilter.priv_class for exporting filter options through the
            AVOptions API in the similar way private options work in lavc and lavf.
  44d4488 / 8114c10 - Add avfilter_get_class().
  Switch all filters to use AVOptions.

2013-03-19 - 17ebef2 / 2c328a9 - lavu 52.20.100 / 52.9.0 - pixdesc.h
  Add av_pix_fmt_count_planes() function for counting planes in a pixel format.

2013-03-16 - ecade98 / 42c7c61 - lavfi 3.47.100 / 3.6.0
  Add AVFilterGraph.nb_filters, deprecate AVFilterGraph.filter_count.

2013-03-08 - Reference counted buffers - lavu 52.8.0, lavc 55.0.100 / 55.0.0, lavf 55.0.100 / 55.0.0,
lavd 54.4.100 / 54.0.0, lavfi 3.5.0
  36099df / 8e401db, 532f31a / 1cec062 - add a new API for reference counted buffers and buffer
                     pools (new header libavutil/buffer.h).
  2653e12 / 1afddbe - add AVPacket.buf to allow reference counting for the AVPacket data.
            Add av_packet_from_data() function for constructing packets from
            av_malloc()ed data.
  c4e8821 / 7ecc2d4 - move AVFrame from lavc to lavu (new header libavutil/frame.h), add
            AVFrame.buf/extended_buf to allow reference counting for the AVFrame
            data. Add new API for working with reference-counted AVFrames.
  80e9e63 / 759001c - add the refcounted_frames field to AVCodecContext to make audio and
            video decoders return reference-counted frames. Add get_buffer2()
            callback to AVCodecContext which allocates reference-counted frames.
            Add avcodec_default_get_buffer2() as the default get_buffer2()
            implementation.
            Deprecate AVCodecContext.get_buffer() / release_buffer() /
            reget_buffer(), avcodec_default_get_buffer(),
            avcodec_default_reget_buffer(), avcodec_default_release_buffer().
            Remove avcodec_default_free_buffers(), which should not have ever
            been called from outside of lavc.
            Deprecate the following AVFrame fields:
                * base -- is now stored in AVBufferRef
                * reference, type, buffer_hints -- are unnecessary in the new API
                * hwaccel_picture_private, owner, thread_opaque -- should not
                  have been acessed from outside of lavc
                * qscale_table, qstride, qscale_type, mbskip_table, motion_val,
                  mb_type, dct_coeff, ref_index -- mpegvideo-specific tables,
                  which are not exported anymore.
  a05a44e / 7e35037 - switch libavfilter to use AVFrame instead of AVFilterBufferRef. Add
            av_buffersrc_add_frame(), deprecate av_buffersrc_buffer().
            Add av_buffersink_get_frame() and av_buffersink_get_samples(),
            deprecate av_buffersink_read() and av_buffersink_read_samples().
            Deprecate AVFilterBufferRef and all functions for working with it.

2013-03-17 - 6c17ff8 / 12c5c1d - lavu 52.19.100 / 52.8.0 - avstring.h
  Add av_isdigit, av_isgraph, av_isspace, av_isxdigit.

2013-02-23 - 71cf094 / 9f12235 - lavfi 3.40.100 / 3.4.0 - avfiltergraph.h
  Add resample_lavr_opts to AVFilterGraph for setting libavresample options
  for auto-inserted resample filters.

2013-01-25 - e7e14bc / 38c1466 - lavu 52.17.100 / 52.7.0 - dict.h
  Add av_dict_parse_string() to set multiple key/value pairs at once from a
  string.

2013-01-25 - 25be630 / b85a5e8 - lavu 52.16.100 / 52.6.0 - avstring.h
  Add av_strnstr()

2013-01-15 - e7e0186 / 8ee288d - lavu 52.15.100 / 52.5.0 - hmac.h
  Add AVHMAC.

2013-01-13 - 8ee7b38 / 44e065d - lavc 54.87.100 / 54.36.0 - vdpau.h
  Add AVVDPAUContext struct for VDPAU hardware-accelerated decoding.

2013-01-12 - dae382b / 169fb94 - lavu 52.14.100 / 52.4.0 - pixdesc.h
  Add AV_PIX_FMT_VDPAU flag.

2013-01-07 - 249fca3 / 074a00d - lavr 1.1.0
  Add avresample_set_channel_mapping() for input channel reordering,
  duplication, and silencing.

2012-12-29 - 2ce43b3 / d8fd06c - lavu 52.13.100 / 52.3.0 - avstring.h
  Add av_basename() and av_dirname().

2012-11-11 - 03b0787 / 5980f5d - lavu 52.6.100 / 52.2.0 - audioconvert.h
  Rename audioconvert.h to channel_layout.h. audioconvert.h is now deprecated.

2012-11-05 - 7d26be6 / dfde8a3 - lavu 52.5.100 / 52.1.0 - intmath.h
  Add av_ctz() for trailing zero bit count

2012-10-21 - e3a91c5 / a893655 - lavu 51.77.100 / 51.45.0 - error.h
  Add AVERROR_EXPERIMENTAL

2012-10-12 - a33ed6b / d2fcb35 - lavu 51.76.100 / 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 - f391e40 / 9a92aea - lavu 51.75.100 / 51.43.0 - aes.h, md5.h, sha.h, tree.h
  Add functions for allocating the opaque contexts for the algorithms,

2012-10-10 - de31814 / b522000 - lavf 54.32.100 / 54.18.0 - avio.h
  Add avio_closep to complement avio_close.

2012-10-08 - ae77266 / 78071a1 - lavu 51.74.100 / 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 - 55c49af / 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 - 46a3595 / a42aada - lavc 54.59.100 / 54.28.0 - avcodec.h
  Add avcodec_free_frame(). This function must now
  be used for freeing an AVFrame.

2012-09-12 - e3e09f2 / 8919fee - lavu 51.73.100 / 51.41.0 - audioconvert.h
  Added AV_CH_LOW_FREQUENCY_2 channel mask value.

2012-09-04 - b21b5b0 / 686a329 - lavu 51.71.100 / 51.40.0 - opt.h
  Reordered the fields in default_val in AVOption, changed which
  default_val field is used for which AVOptionType.

2012-08-30 - 98298eb / a231832 - lavc 54.54.101 / 54.26.1 - avcodec.h
  Add codec descriptor properties AV_CODEC_PROP_LOSSY and
  AV_CODEC_PROP_LOSSLESS.

2012-08-18 - lavc 54.26 - avcodec.h
  Add codec descriptors for accessing codec properties without having
  to refer to a specific decoder or encoder.

  f5f3684 / c223d79 - Add an AVCodecDescriptor struct and functions
            avcodec_descriptor_get() and avcodec_descriptor_next().
  f5f3684 / 51efed1 - Add AVCodecDescriptor.props and AV_CODEC_PROP_INTRA_ONLY.
  6c180b3 / 91e59fe - Add avcodec_descriptor_get_by_name().

2012-08-08 - f5f3684 / 987170c - lavu 51.68.100 / 51.38.0 - dict.h
  Add av_dict_count().

2012-08-07 - 7a72695 / 104e10f - lavc 54.51.100 / 54.25.0 - avcodec.h
  Rename CodecID to AVCodecID and all CODEC_ID_* to AV_CODEC_ID_*.
  To provide backwards compatibility, CodecID is now #defined as AVCodecID.
  Note that this can break user code that includes avcodec.h and uses the
  'CodecID' identifier. Such code should either #undef CodecID or stop using the
  CodecID name.

2012-08-03 - e776ee8 / 239fdf1 - lavu 51.66.101 / 51.37.1 - cpu.h
                       lsws 2.1.1   - swscale.h
  Rename AV_CPU_FLAG_MMX2  ---> AV_CPU_FLAG_MMXEXT.
  Rename SWS_CPU_CAPS_MMX2 ---> SWS_CPU_CAPS_MMXEXT.

2012-07-29 - 7c26761 / 681ed00 - lavf 54.22.100 / 54.13.0 - avformat.h
  Add AVFMT_FLAG_NOBUFFER for low latency use cases.

2012-07-10 - fbe0245 / f3e5e6f - lavu 51.65.100 / 51.37.0
  Add av_malloc_array() and av_mallocz_array()

2012-06-22 - e847f41 / d3d3a32 - lavu 51.61.100 / 51.34.0
  Add av_usleep()

2012-06-20 - 4da42eb / ae0a301 - lavu 51.60.100 / 51.33.0
  Move av_gettime() to libavutil, add libavutil/time.h

2012-06-09 - 82edf67 / 3971be0 - lavr 0.0.3
  Add a parameter to avresample_build_matrix() for Dolby/DPLII downmixing.

2012-06-12 - c7b9eab / 9baeff9 - lavfi 2.79.100 / 2.23.0 - avfilter.h
  Add AVFilterContext.nb_inputs/outputs. Deprecate
  AVFilterContext.input/output_count.

2012-06-12 - c7b9eab / 84b9fbe - lavfi 2.79.100 / 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 - 3630a07 / b0f0dfc - lavu 51.57.100 / 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 - 53ce990 / 154486f - lavu 51.55.100 / 51.31.0 - opt.h
  Add av_opt_set_bin()

2012-05-15 - lavfi 2.74.100 / 2.17.0
  Add support for audio filters
  61930bd / ac71230, 1cbf7fb / a2cd9be - add video/audio buffer sink in a new installed
                    header buffersink.h
  1cbf7fb / 720c6b7 - add av_buffersrc_write_frame(), deprecate
            av_vsrc_buffer_add_frame()
  61930bd / ab16504 - add avfilter_copy_buf_props()
  61930bd / 9453c9e - add extended_data to AVFilterBuffer
  61930bd / 1b8c927 - add avfilter_get_audio_buffer_ref_from_arrays()

2012-05-09 - lavu 51.53.100 / 51.30.0 - samplefmt.h
  61930bd / 142e740 - add av_samples_copy()
  61930bd / 6d7f617 - add av_samples_set_silence()

2012-05-09 - 61930bd / a5117a2 - lavc 54.21.101 / 54.13.1
  For audio formats with fixed frame size, the last frame
  no longer needs to be padded with silence, libavcodec
  will handle this internally (effectively all encoders
  behave as if they had CODEC_CAP_SMALL_LAST_FRAME set).

2012-05-07 - 653d117 / 828bd08 - lavc 54.20.100 / 54.13.0 - avcodec.h
  Add sample_rate and channel_layout fields to AVFrame.

2012-05-01 - 2330eb1 / 4010d72 - lavr 0.0.1
  Change AV_MIX_COEFF_TYPE_Q6 to AV_MIX_COEFF_TYPE_Q8.

2012-04-25 - e890b68 / 3527a73 - lavu 51.48.100 / 51.29.0 - cpu.h
  Add av_parse_cpu_flags()

2012-04-24 - 3ead79e / c8af852 - lavr 0.0.0
  Add libavresample audio conversion library

2012-04-20 - 3194ab7 / 0c0d1bc - lavu 51.47.100 / 51.28.0 - audio_fifo.h
  Add audio FIFO functions:
    av_audio_fifo_free()
    av_audio_fifo_alloc()
    av_audio_fifo_realloc()
    av_audio_fifo_write()
    av_audio_fifo_read()
    av_audio_fifo_drain()
    av_audio_fifo_reset()
    av_audio_fifo_size()
    av_audio_fifo_space()

2012-04-14 - lavfi 2.70.100 / 2.16.0 - avfiltergraph.h
  7432bcf / d7bcc71 Add avfilter_graph_parse2().

2012-04-08 - 6bfb304 / 4d693b0 - lavu 51.46.100 / 51.27.0 - samplefmt.h
  Add av_get_packed_sample_fmt() and av_get_planar_sample_fmt()

2012-03-21 - b75c67d - lavu 51.43.100
  Add bprint.h for bprint API.

2012-02-21 - 9cbf17e - lavc 54.4.100
  Add av_get_pcm_codec() function.

2012-02-16 - 560b224 - libswr 0.7.100
  Add swr_set_matrix() function.

2012-02-09 - c28e7af - lavu 51.39.100
  Add a new installed header libavutil/timestamp.h with timestamp
  utilities.

2012-02-06 - 70ffda3 - lavu 51.38.100
  Add av_parse_ratio() function to parseutils.h.

2012-02-06 - 70ffda3 - lavu 51.38.100
  Add AV_LOG_MAX_OFFSET macro to log.h.

2012-02-02 - 0eaa123 - lavu 51.37.100
  Add public timecode helpers.

2012-01-24 - 0c3577b - lavfi 2.60.100
  Add avfilter_graph_dump.

2012-03-20 - 0ebd836 / 3c90cc2 - lavfo 54.2.0
  Deprecate av_read_packet(), use av_read_frame() with
  AVFMT_FLAG_NOPARSE | AVFMT_FLAG_NOFILLIN in AVFormatContext.flags

2012-03-05 - lavc 54.10.100 / 54.8.0
  f095391 / 6699d07 Add av_get_exact_bits_per_sample()
  f095391 / 9524cf7 Add av_get_audio_frame_duration()

2012-03-04 - 2af8f2c / 44fe77b - lavc 54.8.100 / 54.7.0 - avcodec.h
  Add av_codec_is_encoder/decoder().

2012-03-01 - 1eb7f39 / 442c132 - lavc 54.5.100 / 54.3.0 - avcodec.h
  Add av_packet_shrink_side_data.

2012-02-29 - 79ae084 / dd2a4bc - lavf 54.2.100 / 54.2.0 - avformat.h
  Add AVStream.attached_pic and AV_DISPOSITION_ATTACHED_PIC,
  used for dealing with attached pictures/cover art.

2012-02-25 - 305e4b3 / c9bca80 - lavu 51.41.100 / 51.24.0 - error.h
  Add AVERROR_UNKNOWN
  NOTE: this was backported to 0.8

2012-02-20 - eadd426 / e9cda85 - lavc 54.2.100 / 54.2.0
  Add duration field to AVCodecParserContext

2012-02-20 - eadd426 / 0b42a93 - lavu 51.40.100 / 51.23.1 - mathematics.h
  Add av_rescale_q_rnd()

2012-02-08 - f2b20b7 / 38d5533 - lavu 51.38.101 / 51.22.1 - pixdesc.h
  Add PIX_FMT_PSEUDOPAL flag.

2012-02-08 - f2b20b7 / 52f82a1 - lavc 54.2.100 / 54.1.0
  Add avcodec_encode_video2() and deprecate avcodec_encode_video().

2012-02-01 - 4c677df / 316fc74 - lavc 54.1.0
  Add av_fast_padded_malloc() as alternative for av_realloc() when aligned
  memory is required. The buffer will always have FF_INPUT_BUFFER_PADDING_SIZE
  zero-padded bytes at the end.

2012-01-31 - a369a6b / dd6d3b0 - lavf 54.1.0
  Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().
  NOTE: this was backported to 0.8

2012-01-31 - a369a6b / af08d9a - lavc 54.1.0
  Add avcodec_is_open() function.
  NOTE: this was backported to 0.8

2012-01-30 - 151ecc2 / 8b93312 - lavu 51.36.100 / 51.22.0 - intfloat.h
  Add a new installed header libavutil/intfloat.h with int/float punning
  functions.
  NOTE: this was backported to 0.8

2012-01-25 - lavf 53.31.100 / 53.22.0
  3c5fe5b / f1caf01 Allow doing av_write_frame(ctx, NULL) for flushing possible
          buffered data within a muxer. Added AVFMT_ALLOW_FLUSH for
          muxers supporting it (av_write_frame makes sure it is called
          only for muxers with this flag).

2012-01-15 - lavc 53.56.105 / 53.34.0
  New audio encoding API:
  67f5650 / b2c75b6 Add CODEC_CAP_VARIABLE_FRAME_SIZE capability for use by audio
          encoders.
  67f5650 / 5ee5fa0 Add avcodec_fill_audio_frame() as a convenience function.
  67f5650 / b2c75b6 Add avcodec_encode_audio2() and deprecate avcodec_encode_audio().
          Add AVCodec.encode2().

2012-01-12 - b18e17e / 3167dc9 - lavfi 2.59.100 / 2.15.0
  Add a new installed header -- libavfilter/version.h -- with version macros.

2011-12-08 - a502939 - lavfi 2.52.0
  Add av_buffersink_poll_frame() to buffersink.h.

2011-12-08 - 26c6fec - lavu 51.31.0
  Add av_log_format_line.

2011-12-03 - 976b095 - lavu 51.30.0
  Add AVERROR_BUG.

2011-11-24 - 573ffbb - lavu 51.28.1
  Add av_get_alt_sample_fmt() to samplefmt.h.

2011-11-03 - 96949da - lavu 51.23.0
  Add av_strcasecmp() and av_strncasecmp() to avstring.h.

2011-10-20 - b35e9e1 - lavu 51.22.0
  Add av_strtok() to avstring.h.

2012-01-03 - ad1c8dd / b73ec05 - lavu 51.34.100 / 51.21.0
  Add av_popcount64

2011-12-18 - 7c29313 / 8400b12 - lavc 53.46.1 / 53.28.1
  Deprecate AVFrame.age. The field is unused.

2011-12-12 - 8bc7fe4 / 5266045 - lavf 53.25.0 / 53.17.0
  Add avformat_close_input().
  Deprecate av_close_input_file() and av_close_input_stream().

2011-12-02 - e4de716 / 0eea212 - lavc 53.40.0 / 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().

2011-12-04 - e4de716 / 560f773 - lavc 53.40.0 / 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 - 8e576d5 / bbb46f3 - lavu 51.27.0 / 51.18.0
  Add av_samples_get_buffer_size(), av_samples_fill_arrays(), and
  av_samples_alloc(), to samplefmt.h.

2011-11-23 - 8e576d5 / 8889cc4 - lavu 51.27.0 / 51.17.0
  Add planar sample formats and av_sample_fmt_is_planar() to samplefmt.h.

2011-11-19 - dbb38bc / f3a29b7 - lavc 53.36.0 / 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 - 8709ba9 / 6270671 - lavu 51.26.0 / 51.16.0
  Add av_timegm()

2011-11-13 - lavf 53.21.0 / 53.15.0
  New interrupt callback API, allowing per-AVFormatContext/AVIOContext
  interrupt callbacks.
  5f268ca / 6aa0b98 Add AVIOInterruptCB struct and the interrupt_callback field to
          AVFormatContext.
  5f268ca / 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 - 13b7781 / ba04ecf - lavu 51.24.0 / 51.14.0
  Add av_strcasecmp() and av_strncasecmp() to avstring.h.

2011-11-06 - 13b7781 / 07b172f - lavu 51.24.0 / 51.13.0
  Add av_toupper()/av_tolower()

2011-11-05 - d8cab5c / b6d08f4 - lavf 53.19.0 / 53.13.0
  Add avformat_network_init()/avformat_network_deinit()

2011-10-27 - 6faf0a2 / 512557b - lavc 53.24.0 / 53.15.0
  Remove avcodec_parse_frame.
  Deprecate AVCodecContext.parse_only and CODEC_CAP_PARSE_ONLY.

2011-10-19 - d049257 / 569129a - lavf 53.17.0 / 53.10.0
  Add avformat_new_stream(). Deprecate av_new_stream().

2011-10-13 - 91eb1b1 / b631fba - lavf 53.16.0 / 53.9.0
  Add AVFMT_NO_BYTE_SEEK AVInputFormat flag.

2011-10-12 - lavu 51.21.0 / 51.12.0
  AVOptions API rewrite.

  - f884ef0 / 145f741 FF_OPT_TYPE* renamed to AV_OPT_TYPE_*
  - new setting/getting functions with slightly different semantics:
        f884ef0 / 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

        f884ef0 / 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

  - f884ef0 / 8c5dcaa trivial rename av_next_option -> av_opt_next
  - f884ef0 / 641c7af new functions - av_opt_child_next, av_opt_child_class_next
    and av_opt_find2()

2011-09-22 - a70e787 - lavu 51.17.0
  Add av_x_if_null().

2011-09-18 - 645cebb - lavc 53.16.0
  Add showall flag2

2011-09-16 - ea8de10 - lavfi 2.42.0
  Add avfilter_all_channel_layouts.

2011-09-16 - 9899037 - lavfi 2.41.0
  Rename avfilter_all_* function names to avfilter_make_all_*.

  In particular, apply the renames:
  avfilter_all_formats         -> avfilter_make_all_formats
  avfilter_all_channel_layouts -> avfilter_make_all_channel_layouts
  avfilter_all_packing_formats -> avfilter_make_all_packing_formats

2011-09-12 - 4381bdd - lavfi 2.40.0
  Change AVFilterBufferRefAudioProps.sample_rate type from uint32_t to int.

2011-09-12 - 2c03174 - lavfi 2.40.0
  Simplify signature for avfilter_get_audio_buffer(), make it
  consistent with avfilter_get_video_buffer().

2011-09-06 - 4f7dfe1 - lavfi 2.39.0
  Rename libavfilter/vsink_buffer.h to libavfilter/buffersink.h.

2011-09-06 - c4415f6 - lavfi 2.38.0
  Unify video and audio sink API.

  In particular, add av_buffersink_get_buffer_ref(), deprecate
  av_vsink_buffer_get_video_buffer_ref() and change the value for the
  opaque field passed to the abuffersink init function.

2011-09-04 - 61e2e29 - lavu 51.16.0
  Add av_asprintf().

2011-08-22 - dacd827 - lavf 53.10.0
  Add av_find_program_from_stream().

2011-08-20 - 69e2c1a - lavu 51.13.0
  Add av_get_media_type_string().

2011-09-03 - 1889c67 / fb4ca26 - lavc 53.13.0
                       lavf 53.11.0
                       lsws  2.1.0
  Add {avcodec,avformat,sws}_get_class().

2011-08-03 - 1889c67 / c11fb82 - lavu 51.15.0
  Add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find() function.

2011-08-14 - 323b930 - lavu 51.12.0
  Add av_fifo_peek2(), deprecate av_fifo_peek().

2011-08-26 - lavu 51.14.0 / 51.9.0
  - 976a8b2 / add41de..976a8b2 / abc78a5 Do not include intfloat_readwrite.h,
    mathematics.h, rational.h, pixfmt.h, or log.h from avutil.h.

2011-08-16 - 27fbe31 / 48f9e45 - lavf 53.11.0 / 53.8.0
  Add avformat_query_codec().

2011-08-16 - 27fbe31 / bca06e7 - lavc 53.11.0
  Add avcodec_get_type().

2011-08-06 - 0cb233c / 2f63440 - lavf 53.7.0
  Add error_recognition to AVFormatContext.

2011-08-02 - 1d186e9 / 9d39cbf - lavc 53.9.1
  Add AV_PKT_FLAG_CORRUPT AVPacket flag.

2011-07-16 - b57df29 - lavfi 2.27.0
  Add audio packing negotiation fields and helper functions.

  In particular, add AVFilterPacking enum, planar, in_packings and
  out_packings fields to AVFilterLink, and the functions:
  avfilter_set_common_packing_formats()
  avfilter_all_packing_formats()

2011-07-10 - 3602ad7 / a67c061 - lavf 53.6.0
  Add avformat_find_stream_info(), deprecate av_find_stream_info().
  NOTE: this was backported to 0.7

2011-07-10 - 3602ad7 / 0b950fe - lavc 53.8.0
  Add avcodec_open2(), deprecate avcodec_open().
  NOTE: this was backported to 0.7

  Add avcodec_alloc_context3. Deprecate avcodec_alloc_context() and
  avcodec_alloc_context2().

2011-07-01 - b442ca6 - lavf 53.5.0 - avformat.h
  Add function av_get_output_timestamp().

2011-06-28 - 5129336 - lavu 51.11.0 - avutil.h
  Define the AV_PICTURE_TYPE_NONE value in AVPictureType enum.

2011-06-19 - fd2c0a5 - lavfi 2.23.0 - avfilter.h
  Add layout negotiation fields and helper functions.

  In particular, add in_chlayouts and out_chlayouts to AVFilterLink,
  and the functions:
  avfilter_set_common_sample_formats()
  avfilter_set_common_channel_layouts()
  avfilter_all_channel_layouts()

2011-06-19 - 527ca39 - lavfi 2.22.0 - AVFilterFormats
  Change type of AVFilterFormats.formats from int * to int64_t *,
  and update formats handling API accordingly.

  avfilter_make_format_list() still takes a int32_t array and converts
  it to int64_t. A new function, avfilter_make_format64_list(), that
  takes int64_t arrays has been added.

2011-06-19 - 44f669e - lavfi 2.21.0 - vsink_buffer.h
  Add video sink buffer and vsink_buffer.h public header.

2011-06-12 - 9fdf772 - lavfi 2.18.0 - avcodec.h
  Add avfilter_get_video_buffer_ref_from_frame() function in
  libavfilter/avcodec.h.

2011-06-12 - c535494 - lavfi 2.17.0 - avfiltergraph.h
  Add avfilter_inout_alloc() and avfilter_inout_free() functions.

2011-06-12 - 6119b23 - lavfi 2.16.0 - avfilter_graph_parse()
  Change avfilter_graph_parse() signature.

2011-06-23 - 686959e / 67e9ae1 - lavu 51.10.0 / 51.8.0 - attributes.h
  Add av_printf_format().

2011-06-16 - 2905e3f / 05e84c9, 2905e3f / 25de595 - lavf 53.4.0 / 53.2.0 - avformat.h
  Add avformat_open_input and avformat_write_header().
  Deprecate av_open_input_stream, av_open_input_file,
  AVFormatParameters and av_write_header.

2011-06-16 - 2905e3f / 7e83e1c, 2905e3f / dc59ec5 - lavu 51.9.0 / 51.7.0 - opt.h
  Add av_opt_set_dict() and av_opt_find().
  Deprecate av_find_opt().
  Add AV_DICT_APPEND flag.

2011-06-10 - 45fb647 / cb7c11c - lavu 51.6.0 - opt.h
  Add av_opt_flag_is_set().

2011-06-10 - c381960 - lavfi 2.15.0 - avfilter_get_audio_buffer_ref_from_arrays
  Add avfilter_get_audio_buffer_ref_from_arrays() to avfilter.h.

2011-06-09 - f9ecb84 / d9f80ea - lavu 51.8.0 - AVMetadata
  Move AVMetadata from lavf to lavu and rename it to
  AVDictionary -- new installed header dict.h.
  All av_metadata_* functions renamed to av_dict_*.

2011-06-07 - d552f61 / a6703fa - lavu 51.8.0 - av_get_bytes_per_sample()
  Add av_get_bytes_per_sample() in libavutil/samplefmt.h.
  Deprecate av_get_bits_per_sample_fmt().

2011-06-05 - f956924 / b39b062 - lavu 51.8.0 - opt.h
  Add av_opt_free convenience function.

2011-06-06 - 95a0242 - lavfi 2.14.0 - AVFilterBufferRefAudioProps
  Remove AVFilterBufferRefAudioProps.size, and use nb_samples in
  avfilter_get_audio_buffer() and avfilter_default_get_audio_buffer() in
  place of size.

2011-06-06 - 0bc2cca - lavu 51.6.0 - av_samples_alloc()
  Switch nb_channels and nb_samples parameters order in
  av_samples_alloc().

2011-06-06 - e1c7414 - lavu 51.5.0 - av_samples_*
  Change the data layout created by av_samples_fill_arrays() and
  av_samples_alloc().

2011-06-06 - 27bcf55 - lavfi 2.13.0 - vsrc_buffer.h
  Make av_vsrc_buffer_add_video_buffer_ref() accepts an additional
  flags parameter in input.

2011-06-03 - e977ca2 - lavfi 2.12.0 - avfilter_link_free()
  Add avfilter_link_free() function.

2011-06-02 - 5ad38d9 - lavu 51.4.0 - av_force_cpu_flags()
  Add av_cpu_flags() in libavutil/cpu.h.

2011-05-28 - e71f260 - lavu 51.3.0 - pixdesc.h
  Add av_get_pix_fmt_name() in libavutil/pixdesc.h, and deprecate
  avcodec_get_pix_fmt_name() in libavcodec/avcodec.h in its favor.

2011-05-25 - 39e4206 / 30315a8 - lavf 53.3.0 - avformat.h
  Add fps_probe_size to AVFormatContext.

2011-05-22 - 5ecdfd0 - lavf 53.2.0 - avformat.h