Never assume the API of libav* to be stable unless at least 1 month has passedsince the last major version increase. The last version increases were:libavcodec:    2015-08-28libavdevice:   2015-08-28libavfilter:   2015-08-28libavformat:   2015-08-28libavresample: 2015-08-28libswscale:    2015-08-28libavutil:     2015-08-28  API changes, most recent first: 2015-xx-xx - xxxxxxx - lavu 55.2.0 - dict.h  Change return type of av_dict_copy() from void to int, so that a proper  error code can be reported. 2015-xx-xx - xxxxxxx - lavc 57.0.0 - avcodec.h  Change type of AVPacket.duration from int to int64_t. 2015-xx-xx - xxxxxxx - lavc 57.2.0 - d3d11va.h  Add av_d3d11va_alloc_context(). This function must from now on be used for  allocating AVD3D11VAContext. 2015-xx-xx - lavu 55.0.0  xxxxxxx - Change type of AVPixFmtDescriptor.flags from uint8_t to uint64_t.  xxxxxxx - Change type of AVComponentDescriptor fields from uint16_t to int            and drop bit packing.  xxxxxxx - Add step, offset, and depth to AVComponentDescriptor to replace            the deprecated step_minus1, offset_plus1, and depth_minus1. 2015-xx-xx - lavu 54.17.0  xxxxxxx -  Add av_blowfish_alloc().  xxxxxxx -  Add av_rc4_alloc().  xxxxxxx -  Add av_xtea_alloc().  xxxxxxx -  Add av_des_alloc(). 2015-07-29 - 7e38340 - lavu 54.16.0 - hmac.h  Add AV_HMAC_SHA224 and AV_HMAC_SHA256. 2015-xx-xx - lavc 56.35.0 - avcodec.h  xxxxxxxxx - Rename CODEC_FLAG* defines to AV_CODEC_FLAG*.  xxxxxxxxx - Rename CODEC_CAP_* defines to AV_CODEC_CAP_*.  xxxxxxxxx - Rename FF_INPUT_BUFFER_PADDING_SIZE and FF_MIN_BUFFER_SIZE              to AV_INPUT_BUFFER_PADDING_SIZE and AV_INPUT_BUFFER_MIN_SIZE. 2015-xx-xx - xxxxxxx - lavc 56.33.0 - avcodec.h  Add AV_PKT_DATA_QUALITY_FACTOR to export the quality value of an AVPacket. 2015-xx-xx - xxxxxxx - lavu 56.15.0  Add av_version_info(). 2015-xx-xx - xxxxxxx - lavfi 5.1.0 - version.h             xxxxxxx - lavd 55.2.0 - version.h  Add library identification symbols, LIBAVFILTER_IDENT and LIBAVDEVICE_IDENT. 2015-xx-xx - xxxxxxx - lavf 56.20.0 - avio.h  Add avio_put_str16be. 2015-xx-xx - xxxxxxx - lavu 54.14.0 - cpu.h  Add AV_CPU_FLAG_AVXSLOW. 2015-xx-xx - xxxxxxx - lavc 56.23.0  Add av_vda_default_init2. 2015-xx-xx - xxxxxxx - lavu 54.12.0  Add AV_LOG_TRACE for extremely verbose debugging. 2015-xx-xx - xxxxxxx - lavu 54.11.0  Add av_small_strptime(). 2015-xx-xx - xxxxxxx - lavc 56.22.0  Add FF_PROFILE_DTS_EXPRESS. 2015-xx-xx - xxxxxxx - lavu 54.10.0  Add AV_PIX_FMT_MMAL for MMAL hardware acceleration. 2015-xx-xx - xxxxxxx - lavc 56.13  Add width, height, coded_width, coded_height and format to  AVCodecParserContext. 2015-xx-xx - xxxxxxx - lavu 54.9.0  Add AV_PIX_FMT_QSV for QSV hardware acceleration. 2015-01-27 - 728685f - lavc 56.12.0, lavu 54.8.0 - avcodec.h, frame.h  Add AV_PKT_DATA_AUDIO_SERVICE_TYPE and AV_FRAME_DATA_AUDIO_SERVICE_TYPE for  storing the audio service type as side data. 2015-01-14 - e2ad0b6 - lavu 54.6.0 - imgutils.h  Add utility functions for image manipulation: av_image_get_buffer_size()  av_image_fill_arrays() and av_image_copy_to_buffer(). 2014-12-25 - c220a60 - lavc 56.10.0 - vdpau.h  Add av_vdpau_get_surface_parameters(). 2014-12-25 - 6c99c92 - lavc 56.9.0 - avcodec.h  Add AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH flag to av_vdpau_bind_context(). 2014-12-25 - 57b6704 - lavc 56.8.0 - avcodec.h  Add AVCodecContext.sw_pix_fmt. 2014-11-07 - 1384df6 - lavf 56.06.3 - avformat.h  Add AVFormatContext.avoid_negative_ts. 2014-11-06 - 5e80fb7 - lavc 56.6.0 - vorbis_parser.h  Add a public API for parsing vorbis packets. 2014-10-24 - 1bd0bdc - lavu 54.5.0 - time.h  Add av_gettime_relative(). 2014-10-15 - 7ea1b34 - lavc 56.5.0 - avcodec.h  Replace AVCodecContext.time_base used for decoding  with AVCodecContext.framerate. 2014-10-15 - d565fef1- lavc 56.4.0 - avcodec.h  Add AV_HWACCEL_FLAG_IGNORE_LEVEL flag to av_vdpau_bind_context(). 2014-10-13 - 2df0c32 - lavc 56.03.0 - avcodec.h  Add AVCodecContext.initial_padding. Deprecate the use of AVCodecContext.delay  for audio encoding. 2014-10-08 - 5a419b2 - lavu 54.04.0 - pixdesc.h  Add API to return the name of frame and context color properties. 2014-10-06 - e3e158e - lavc 56.2.0 - vdpau.h  Add av_vdpau_bind_context(). This function should now be used for creating  (or resetting) a AVVDPAUContext instead of av_vdpau_alloc_context(). 2014-08-25 - b263f8f - lavf 56.03.0 - avformat.h  Add AVFormatContext.max_ts_probe. ------------------------------8<-------------------------------------                   11 branch was cut here----------------------------->8-------------------------------------- 2014-08-28 - 9301486 - lavc 56.1.0 - avcodec.h  Add AV_PKT_DATA_STEREO3D to export container-level stereo3d information. 2014-08-13 - 8ddc326 - lavu 54.03.0 - mem.h  Add av_strndup(). 2014-08-13 - a8c104a - lavu 54.02.0 - opt.h  Add av_opt_get_dict_val/set_dict_val with AV_OPT_TYPE_DICT to support  dictionary types being set as options. 2014-08-13 - afbd4b8 - lavf 56.01.0 - avformat.h  Add AVFormatContext.event_flags and AVStream.event_flags for signaling to  the user when events happen in the file/stream. 2014-08-10 - fb1ddcd - lavr 2.1.0 - avresample.h  Add avresample_convert_frame() and avresample_config(). 2014-08-10 - fb1ddcd - lavu 54.1.0 - error.h  Add AVERROR_INPUT_CHANGED and AVERROR_OUTPUT_CHANGED. 2014-08-08 - d35b94f - lavc 55.57.4 - avcodec.h  Deprecate FF_IDCT_XVIDMMX define and xvidmmx idct option.  Replaced by FF_IDCT_XVID and xvid respectively. 2014-08-07 - bb78903 - lsws 2.1.3 - swscale.h  sws_getCachedContext is not going to be removed in the future. 2014-08-07 - ad1ee5f - lavc 55.57.3 - avcodec.h  reordered_opaque is not going to be removed in the future. 2014-08-04 - e9abafc - lavu 53.22.0 - pixfmt.h  Add AV_PIX_FMT_YA16 pixel format for 16 bit packed gray with alpha. 2014-08-04 - e96c3b8 - lavu 53.21.1 - avstring.h  Rename AV_PIX_FMT_Y400A to AV_PIX_FMT_YA8 to better identify the format.  An alias pixel format and color space name are provided for compatibility. 2014-08-04 - d2962e9 - lavu 53.21.0 - pixdesc.h  Support name aliases for pixel formats. 2014-08-03 - 1ef9e83 - lavc 55.57.2 - avcodec.h2014-08-03 - 1ef9e83 - lavu 53.20.0 - frame.h  Deprecate AVCodecContext.dtg_active_format and use side-data instead. 2014-08-03 - 9f17685 - lavc 55.57.1 - avcodec.h  Deprecate unused FF_IDCT_IPP define and ipp avcodec option.  Deprecate unused FF_DEBUG_PTS define and pts avcodec option.  Deprecate unused FF_CODER_TYPE_DEFLATE define and deflate avcodec option.  Deprecate unused FF_DCT_INT define and int avcodec option.  Deprecate unused avcodec option scenechange_factor. 2014-07-29 - 69e7336 - lavu 53.19.0 - avstring.h  Make name matching function from lavf public as av_match_name(). 2014-07-28 - c5fca01 - lavc 55.57.0 - avcodec.h  Add AV_CODEC_PROP_REORDER to mark codecs supporting frame reordering. 2014-07-09 - a54f03b - lavu 53.18.0 - display.h  Add av_display_matrix_flip() to flip the transformation matrix. 2014-07-09 - f6ee61f - lavc 55.56.0 - dv_profile.h  Add a public API for DV profile handling. 2014-06-20 - 9e500ef - lavu 53.17.0 - imgutils.h  Add av_image_check_sar(). 2014-06-20 - 874390e - lavc 55.55.0 - avcodec.h  Add av_packet_rescale_ts() to simplify timestamp conversion. 2014-06-18 - 194be1f - lavf 55.20.0 - avformat.h  The proper way for providing a hint about the desired timebase to the muxers  is now setting AVStream.time_base, instead of AVStream.codec.time_base as was  done previously. The old method is now deprecated. 2014-06-01 - 0957b27 - lavc 55.54.0 - avcodec.h  Add AVCodecContext.side_data_only_packets to allow encoders to output packets  with only side data. This option may become mandatory in the future, so all  users are recommended to update their code and enable this option. 2014-06-01 - 8c02adc - lavu 53.16.0 - frame.h, pixfmt.h  Move all color-related enums (AVColorPrimaries, AVColorSpace, AVColorRange,  AVColorTransferCharacteristic, and AVChromaLocation) inside lavu.  Add AVFrame fields for them on the next lavu major bump. 2014-05-28 - b2d4565 - lavr 1.3.0 - avresample.h  Add avresample_max_output_samples 2014-05-28 - 6d21259 - lavf 55.19.0 - avformat.h  Add strict_std_compliance and related AVOptions to support experimental  muxing. 2014-05-20 - c23c96b - lavf 55.18.0 - avformat.h  Add av_stream_get_side_data() to access stream-level side data  in the same way as av_packet_get_side_data(). 2014-05-19 - bddd8cb - lavu 53.15.0 - frame.h, display.h  Add AV_FRAME_DATA_DISPLAYMATRIX for exporting frame-level  spatial rendering on video frames for proper display. 2014-05-19 - bddd8cb - lavc 55.53.0 - avcodec.h  Add AV_PKT_DATA_DISPLAYMATRIX for exporting packet-level  spatial rendering on video frames for proper display. 2014-05-19 - a312f71 - lavf 55.17.1 - avformat.h  Deprecate AVStream.pts and the AVFrac struct, which was its only use case.  Those fields were poorly defined and not meant to be public, so there is  no replacement for them. 2014-05-18 - fd05602 - lavc 55.52.0 - avcodec.h  Add avcodec_free_context(). From now on it should be used for freeing  AVCodecContext. 2014-05-15 - 0c1959b - lavf 55.17.0 - avformat.h  Add AVFMT_FLAG_BITEXACT flag. Muxers now use it instead of checking  CODEC_FLAG_BITEXACT on the first stream. 2014-05-11 - 66e6c8a - lavu 53.14.0 - pixfmt.h  Add AV_PIX_FMT_VDA for new-style VDA acceleration. 2014-05-01 - a2941c8 - lavc 55.50.3 - avcodec.h  Deprecate CODEC_FLAG_MV0. It is replaced by the flag "mv0" in the  "mpv_flags" private option of the mpegvideo encoders. 2014-05-01 - 6484149 - lavc 55.50.2 - avcodec.h  Deprecate CODEC_FLAG_GMC. It is replaced by the "gmc" private option of the  libxvid encoder. 2014-05-01 - b2c3171 - lavc 55.50.1 - avcodec.h  Deprecate CODEC_FLAG_NORMALIZE_AQP. It is replaced by the flag "naq" in the  "mpv_flags" private option of the mpegvideo encoders. 2014-05-01 - 5fcceda - avcodec.h  Deprecate CODEC_FLAG_INPUT_PRESERVED. Its functionality is replaced by passing  reference-counted frames to encoders. 2014-04-28 - ed4b757 - lavc 55.50.0 - dxva2.h  Add FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO for old Intel GPUs. 2014-04-22 - 502512e - lavu 53.13.0 - avutil.h  Add av_get_time_base_q(). 2014-04-17 - 0983d48 - lavu 53.12.0 - crc.h  Add AV_CRC_16_ANSI_LE crc variant. 2014-04-07 - 8b17243 - lavu 53.11.0 - pixfmt.h  Add AV_PIX_FMT_YVYU422 pixel format. 2014-04-04 - 8542f9c - lavu 53.10.0 - replaygain.h  Full scale for peak values is now 100000 (instead of UINT32_MAX) and values  may overflow. 2014-04-03 - 7763118 - lavu 53.09.0 - log.h  Add AV_LOG(c) macro to have 256 color debug messages. 2014-03-24 - d161ae0 - lavu 53.08.0 - frame.h  Add av_frame_remove_side_data() for removing a single side data  instance from a frame. 2014-03-24 - 5a7e35d - lavu 53.07.0 - frame.h, replaygain.h  Add AV_FRAME_DATA_REPLAYGAIN for exporting replaygain tags.  Add a new header replaygain.h with the AVReplayGain struct. 2014-03-24 - 5a7e35d - lavc 55.36.0 - avcodec.h  Add AV_PKT_DATA_REPLAYGAIN for exporting replaygain tags. 2014-03-24 - 25b3258 - lavf 55.13.0 - avformat.h  Add AVStream.side_data and AVStream.nb_side_data for exporting stream-global  side data (e.g. replaygain tags, video rotation) 2014-03-24 - 0e2c3ee - lavc 55.35.0 - avcodec.h  Give the name AVPacketSideData to the previously anonymous struct used for  AVPacket.side_data. 2014-03-16 - 1481d24 - lavu 53.06.0 - pixfmt.h  Add RGBA64 pixel format and variants. 2014-02-24 - 1155fd0 - lavu 53.05.0 - frame.h  Add av_frame_copy() for copying the frame data. 2014-02-22 - 7e86c27 - lavr 1.2.0 - avresample.h  Add avresample_is_open() for checking whether a resample context is open. 2014-02-19 - c3ecd96 - lavu 53.04.0  - opt.h  Add AV_OPT_FLAG_EXPORT and AV_OPT_FLAG_READONLY to mark options meant (only)  for reading. 2014-02-19 - 6bb8720 - lavu 53.03.01 - opt.h  Deprecate unused AV_OPT_FLAG_METADATA. ------------------------------8<-------------------------------------                   10 branch was cut here----------------------------->8-------------------------------------- 2014-02-15 - c98f316 - lavu 53.3.0 - frame.h  Add AV_FRAME_DATA_DOWNMIX_INFO value to the AVFrameSideDataType enum and  downmix_info.h API, which identify downmix-related metadata. 2014-02-04 - d9ae103 - lavf 55.11.0 - avformat.h  Add AVFormatContext.max_interleave_delta for controlling amount of buffering  when interleaving. 2014-01-20 - 93c553c - lavc 55.32.1 - avcodec.h  Edges are not required anymore on video buffers allocated by get_buffer2()  (i.e. as if the CODEC_FLAG_EMU_EDGE flag was always on). Deprecate  CODEC_FLAG_EMU_EDGE and avcodec_get_edge_width(). 2014-01-05 - 5b4797a - lavu 53.2.0 - frame.h  Add AV_FRAME_DATA_MATRIXENCODING value to the AVFrameSideDataType enum, which  identifies AVMatrixEncoding data. 2014-01-05 - 5c437fb - lavu 53.1.0 - channel_layout.h  Add values for various Dolby flags to the AVMatrixEncoding enum. 2013-12-20 - 2a41826 - lavc 55.30.0 - avcodec.h  Add HEVC profiles 2013-12-11 - b9fb59d,9431356,d7b3ee9 - 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. 2013-12-09 - 7e244c6- - 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. 2013-11-26 - 1eaac1d- - 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. 2013-11-14 - cce3e0a - lavu 52.18.0 - mem.h  Move av_fast_malloc() and av_fast_realloc() for libavcodec to libavutil. 2013-11-14 - 8941971 - lavc 55.27.0 - avcodec.h  Deprecate AVCodecContext.error_rate, it is replaced by the 'error_rate'  private option of the mpegvideo encoder family. 2013-11-14 - 728c465 - 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. 2013-11-04 - cd8f772 - lavc 55.25.0 - avcodec.h  Add ITU-R BT.2020 and other not yet included values to color primaries,  transfer characteristics and colorspaces. 2013-10-31 - 28096e0 - lavu 52.17.0 - frame.h  Add AVFrame.flags and AV_FRAME_FLAG_CORRUPT. 2013-09-28 - 0767bfd - lavfi 3.11.0 - avfilter.h  Add AVFilterGraph.execute and AVFilterGraph.opaque for custom slice threading  implementations. 2013-09-21 - e208e6d - 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 - 3feb3d6 - lavu 52.15.0 - mem.h  Add av_reallocp. 2013-08-10 - 5a9a9d4 - lavc 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 - f824535 - lavc 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 - 549294f - lavc 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 - a0ad5d0 - lavu 52.14.0 - pixfmt.h  Deprecate AV_PIX_FMT_VDPAU_*. Use AV_PIX_FMT_VDPAU instead. 2013-08-02 - a8b1927 - lavc 55.11.0 - avcodec.h  Add output_picture_number to AVCodecParserContext. 2013-06-24 - 95d5246 - lavc 55.10.0 - avcodec.h  Add MPEG-2 AAC profiles 2013-06-04 - fc962d4 - lavu 52.13.0 - mem.h  Add av_realloc_array and av_reallocp_array 2013-05-24 - 129bb23 - lavfi 3.10.0 - 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 - 2a6eaea - lavu 52.12.0 - cpu.h  Add av_cpu_count() function for getting the number of logical CPUs. 2013-05-24 - b493847 - lavc 55.7.0 - avcodec.h  Add picture_structure to AVCodecParserContext. 2013-05-15 - e6c4ac7 - lavu 52.11.0 - pixdesc.h  Replace PIX_FMT_* flags with AV_PIX_FMT_FLAG_*. 2013-04-03 - 507b1e4 - lavc 55.4.0 - avcodec.h  Add field_order to AVCodecParserContext. 2013-04-19 - 5e83d9a - lavc 55.2.0 - avcodec.h  Add CODEC_FLAG_UNALIGNED to allow decoders to produce unaligned output. 2013-04-11 - lavfi 3.8.0  38f0c07 - Move all content from avfiltergraph.h to avfilter.h. Deprecate            avfilterhraph.h, user applications should include just avfilter.h  bc1a985 - Add avfilter_graph_alloc_filter(), deprecate avfilter_open() and            avfilter_graph_add_filter().  1113672 - Add AVFilterContext.graph pointing to the AVFilterGraph that contains the            filter.  48a5ada - Add avfilter_init_str(), deprecate avfilter_init_filter().  1ba95a9 - Add avfilter_init_dict().  7cdd737 - Add AVFilter.flags field and AVFILTER_FLAG_DYNAMIC_{INPUTS,OUTPUTS} flags.  7e8fe4b - Add avfilter_pad_count() for counting filter inputs/outputs.  fa2a34c - Add avfilter_next(), deprecate av_filter_next().            Deprecate avfilter_uninit(). 2013-04-09 - lavfi 3.7.0 - avfilter.h  b439c99 - Add AVFilter.priv_class for exporting filter options through the            AVOptions API in the similar way private options work in lavc and lavf.  8114c10 - Add avfilter_get_class().  Switch all filters to use AVOptions. 2013-03-19 - 2c328a9 - lavu 52.9.0 - pixdesc.h  Add av_pix_fmt_count_planes() function for counting planes in a pixel format. 2013-03-16 - 42c7c61 - lavfi 3.6.0  Add AVFilterGraph.nb_filters, deprecate AVFilterGraph.filter_count. 2013-03-08 - Reference counted buffers - lavu 52.8.0, lavc 55.0.0, lavf 55.0.0,lavd 54.0.0, lavfi 3.5.0  8e401db, 1cec062 - add a new API for reference counted buffers and buffer                     pools (new header libavutil/buffer.h).  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.  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.  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.  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().

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