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:    2017-03-23libavdevice:   2017-03-23libavfilter:   2017-03-23libavformat:   2017-03-23libavresample: 2017-03-23libswscale:    2017-03-23libavutil:     2017-03-23  API changes, most recent first: 2017-xx-xx - xxxxxxx - lavc 58.8.0 - avcodec.h  Add const to AVCodecContext.hwaccel. 2017-xx-xx - xxxxxxx - lavc 58.7.0 - avcodec.h  Deprecate user visibility of the AVHWAccel structure and the functions  av_register_hwaccel() and av_hwaccel_next(). 2017-xx-xx - xxxxxxx - lavc 58.6.0 - avcodec.h  Add AVCodecHWConfig and avcodec_get_hw_config(). 2017-xx-xx - xxxxxxx - lavu 56.7.0 - stereo3d.h  Add view field to AVStereo3D structure and AVStereo3DView enum. 2017-xx-xx - xxxxxxx - lavc 58.5.0 - avcodec.h  Add avcodec_get_hw_frames_parameters(). 2017-xx-xx - xxxxxxx - lavu 56.6.0 - pixdesc.h  Add av_color_range_from_name(), av_color_primaries_from_name(),  av_color_transfer_from_name(), av_color_space_from_name(), and  av_chroma_location_from_name(). 2016-xx-xx - xxxxxxx - lavf 58.1.0 - avio.h  Add avio_read_partial(). 2017-xx-xx - xxxxxxx - lavu 56.4.0 - imgutils.h  Add av_image_fill_black(). 2017-xx-xx - xxxxxxx - lavu 56.3.0 - frame.h  Add av_frame_apply_cropping(). 2017-xx-xx - xxxxxxx - lavc 58.4.0 - avcodec.h  DXVA2 and D3D11 hardware accelerated decoding now supports the new hwaccel API,  which can create the decoder context and allocate hardware frame automatically.  See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. For D3D11,  the new AV_PIX_FMT_D3D11 pixfmt must be used with the new API. 2017-xx-xx - xxxxxxx - lavu 56.2.0 - hwcontext.h  Add AV_HWDEVICE_TYPE_D3D11VA and AV_PIX_FMT_D3D11. 2017-04-30 - xxxxxxx - lavu 56.1.1 - hwcontext.h  av_hwframe_ctx_create_derived() now takes some AV_HWFRAME_MAP_* combination  as its flags argument (which was previously unused). 2017-04-xx - xxxxxxx - lavu 56.1.0 - spherical.h  Add av_spherical_projection_name() and av_spherical_from_name(). 2017-04-26 - xxxxxxx - lavc 58.3.1 - avcodec.h  Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH. 2017-03-xx - xxxxxxx - lavc 57.37.0 - avcodec.h  Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at  a later point. 2017-03-xx - xxxxxxx - lavu 55.35.0 - hwcontext.h  Add AV_HWDEVICE_TYPE_NONE, av_hwdevice_find_type_by_name(),  av_hwdevice_get_type_name() and av_hwdevice_iterate_types(). 2017-03-xx - xxxxxxx - lavu 55.34.0 - hwcontext.h  Add av_hwdevice_ctx_create_derived(). 2017-02-10 - xxxxxxx - lavu 55.33.0 - spherical.h  Add AV_SPHERICAL_EQUIRECTANGULAR_TILE, av_spherical_tile_bounds(),  and projection-specific properties (bound_left, bound_top, bound_right,  bound_bottom, padding) to AVSphericalMapping. 2017-xx-xx - xxxxxxx - lavc 57.34.0 - avcodec.h  Add AVCodecContext.hw_device_ctx. 2017-02-11 - xxxxxxx - lavu 55.32.0 - frame.h  Add AVFrame.opaque_ref. 2017-02-xx - xxxxxxx - lavu 55.31.1 - frame.h  Allow passing the value of 0 (meaning "automatic") as the required alignment  to av_frame_get_buffer(). 2017-02-xx - xxxxxxx - lavu 55.31.0 - cpu.h  Add av_cpu_max_align() for querying maximum required data alignment. 2016-xx-xx - xxxxxxx - lavf 57.11.0 - avio.h  Add avio_context_free(). From now on it must be used for freeing AVIOContext. 2017-02-01 - xxxxxxx - lavc - avcodec.h  Deprecate AVCodecContext.refcounted_frames. This was useful for deprecated  API only (avcodec_decode_video2/avcodec_decode_audio4). The new decode APIs  (avcodec_send_packet/avcodec_receive_frame) always work with reference  counted frames. 2016-xx-xx - xxxxxxx - lavc 57.31.0 - avcodec.h  Add AVCodecContext.apply_cropping to control whether cropping  is handled by libavcodec or the caller. 2016-xx-xx - xxxxxxx - lavu 55.30.0 - frame.h  Add AVFrame.crop_left/right/top/bottom fields for attaching cropping  information to video frames. 2016-xx-xx - xxxxxxx  Change av_sha_update() and av_md5_sum()/av_md5_update() length  parameter type to size_t at next major bump. 2016-xx-xx - xxxxxxx - lavc 57.29.0 - avcodec.h  Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping  information from containers. 2016-xx-xx - xxxxxxx - lavu 55.30.0 - spherical.h  Add AV_FRAME_DATA_SPHERICAL value, av_spherical_alloc() API and  AVSphericalMapping type to export and describe spherical video properties. 2016-xx-xx - xxxxxxx - lavf 57.10.0 - avformat.h  Add av_stream_add_side_data(). 2016-xx-xx - xxxxxxx - lavu 55.28.0 - pixfmt.h  Add AV_PIX_FMT_GRAY12(LE/BE). 2016-xx-xx - xxxxxxx - lavu 55.27.0 - hwcontext.h  Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags.  Add av_hwframe_ctx_create_derived(). 2016-xx-xx - xxxxxxx - lavu 55.25.0 - pixfmt.h  Add AV_PIX_FMT_GBRAP12(LE/BE). 2016-xx-xx - xxxxxxx - lavu 55.24.0 - pixfmt.h  Add AV_PIX_FMT_GBRP12(LE/BE). 2016-xx-xx - xxxxxxx - lavu 55.23.0 - hwcontext_vaapi.h  Add AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE. 2016-xx-xx - xxxxxxx - lavf 57.08.0 - avio.h  Add AVIO_SEEKABLE_TIME flag. 2016-xx-xx - xxxxxxx - lavu 55.22.0 - pixfmt.h  Add AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, and AV_PIX_FMT_YUV444P12. 2016-xx-xx - xxxxxxx - lavc 57.27.0 - avcodec.h  Add FF_PROFILE_HEVC_REXT, the extended pixel format profile for HEVC. 2016-08-24 - xxxxxxx - lavu 55.21.0 - imgutils.h  Add av_image_copy_uc_from(), a version of av_image_copy() for copying  from GPU mapped memory. 2016-xx-xx - xxxxxxx - lavc 59.26.0 - vaapi.h  Deprecate struct vaapi_context and the vaapi.h installed header.  Callers should set AVCodecContext.hw_frames_ctx instead. ------------------------------8<-------------------------------------                   12 branch was cut here----------------------------->8-------------------------------------- 2016-07-20 - xxxxxxx - lavu 55.20.0 - cpu.h  Add AV_CPU_FLAG_SSSE3SLOW. 2016-07-02 - 4926fa9 - lavu 55.19.0 - hwcontext_vaapi.h  Add driver quirks field to VAAPI-specific hwdevice and enum with  members AV_VAAPI_DRIVER_QUIRK_* to represent its values. 2016-07-02 - b7c5f88 - lavu 55.18.0 - pixfmt.h  Add AV_PIX_FMT_P010(LE/BE). 2016-06-21 - 32c8359 - lavc 57.24.0 - avcodec.h  Decoders now export the frame timestamp as AVFrame.pts. It was  previously exported as AVFrame.pkt_pts, which is now deprecated. 2016-06-21 - 59e7361 - lavu 55.16.0 - hwcontext.h hwcontext_qsv.h  Add AV_HWDEVICE_TYPE_QSV and a new installed header with QSV-specific  hwcontext definitions. 2016-06-21 - e85f6f7 - lavc 57.23.0 - avcodec.h  AVCodecContext.hw_frames_ctx now may be used by decoders. 2016-06-12 - 90f469a - lavc 57.20.0 - avcodec.h  Add FF_PROFILE_H264_MULTIVIEW_HIGH and FF_PROFILE_H264_STEREO_HIGH. 2016-05-26 - 1c9e861 - lavu 55.13.0 - hwcontext.h  Add av_hwdevice_ctx_create(). 2016-05-24 - ad61da05 - lavc 57.19.1 - avcodec.h  Adjust values for JPEG 2000 profiles. 2016-05-18 - db7968b - lavf 57.7.0 - avio.h  Add AVIODataMarkerType, write_data_type, ignore_boundary_point and  avio_write_marker. 2016-05-17 - 0c4468d - lavu 55.12.0 - opt.h  Add av_stereo3d_type_name() and av_stereo3d_from_name(). 2016-05-17 - c46db38 - lavu 55.11.0 - hwcontext_dxva2.h  Add new installed header with DXVA2-specific hwcontext definitions. 2016-03-24 - 564b459 - lavu 55.10.0 - opt.h  Add av_opt_copy(). 2016-03-23 - 05f6670 - lavc 57.16.0 - avcodec.h  Add a new audio/video encoding and decoding API with decoupled input  and output -- avcodec_send_packet(), avcodec_receive_frame(),  avcodec_send_frame() and avcodec_receive_packet(). 2016-03-20 - 33d1898 - lavc 57.15.0 - avcodec.h  Add a new bitstream filtering API working with AVPackets.  Deprecate the old bitstream filtering API. 2016-03-19 - 07a844f - lavfi 6.3.0 - avfilter.h  Add AVFilterContext.hw_device_ctx. 2016-03-19 - 551c677 - lavu 55.9.0 - hwcontext_vaapi.h  Add new installed header with VAAPI-specific hwcontext definitions. 2016-03-19 - d264c72 - lavu 55.8.0 - pixfmt.h  Deprecate all AV_PIX_FMT_VAAPI_* formats.  Replaced by AV_PIX_FMT_VAAPI. 2016-03-19 - b1f01e8 - lavu 55.7.0 - hwcontext.h  Add AVHWFramesConstraints and associated API. 2016-02-23 - 9200514 - lavf 57.5.0 - avformat.h  Add AVStream.codecpar, deprecate AVStream.codec. 2016-02-23 - lavc 57.14.0 - avcodec.h  998e1b8 - Add AVCodecParameters and its related API.  a806834 - Add av_get_audio_frame_duration2(). 2016-02-22 - ec4c483 - lavf 57.4.0 - avformat.h  Add AVFormatContext.protocol_whitelist and protocol_blacklist.  Add 'protocol_whitelist' and 'protocol_blacklist' private options for  avio_open2(). 2016-02-14 - 7b3214d0 - lavc 57.13.0 - avcodec.h  Add AVCodecContext.hw_frames_ctx. 2016-02-14 - lavfi 6.2.0 - avfilter.h  b3dd30d avfilter.h - Add AVFilterLink.hw_frames_ctx.          buffersrc.h - Add AVBufferSrcParameters and functions for handling it. 2016-02-14 - lavu 55.6.0  721a4ef buffer.h - Add av_buffer_pool_init2().  89923e4 hwcontext.h - Add a new installed header hwcontext.h with a new API                        for handling hwaccel frames.  ad884d1 hwcontext_cuda.h - Add a new installed header hwcontext_cuda.h with                             CUDA-specific hwcontext definitions.  a001ce3 hwcontext_vdpau.h - Add a new installed header hwcontext_vdpau.h with                              VDPAU-specific hwcontext definitions.  7bc780c pixfmt.h - Add AV_PIX_FMT_CUDA. 2016-01-24 - 9f61abc - lavf 57.3.0 - avformat.h  Add AVFormatContext.opaque, io_open and io_close, allowing custom IO  for muxers and demuxers that open additional files. 2015-12-12 - 2c68113 - lavc 57.12.0 - avcodec.h  Add AVCodecDescriptor.profiles and avcodec_profile_name(). 2015-12-06 - lavc 57.11.0 - avcodec.h dirac.h  31c51f7 - Add av_packet_add_side_data().  84adab3 - Add AVCodecContext.coded_side_data.  f0b769c - Add AVCPBProperties API.  e02de9d - Add a new public header dirac.h containing            av_dirac_parse_sequence_header() 2015-11-20 - 462a54e - lavc 57.9.1 - avcodec.h  Deprecate rtp_callback without replacement, i.e. it won't be possible to  get image slices before the full frame is encoded any more. The libavformat  rtpenc muxer can still be used for RFC-2190 packetization. 2015-11-18 - 79ae1e6 - lavc 57.9.0 - avcodec.h  Add AV_PKT_DATA_FALLBACK_TRACK for making fallback associations between  streams. 2015-11-18 - 7f4ec43 - lavf 57.1.0 - avformat.h  Add av_stream_new_side_data(). 2015-11-13 - 92d107a - lavu 55.3.0 - xtea.h    Add av_xtea_le_init and av_xtea_le_crypt 2015-11-09 - 48ff668 - lavfi 6.1.0 - avfilter.h    Add a frame_rate field to AVFilterLink 2015-10-26 - lavc 57.7.0 - avcodec.h  ce70f28 - Deprecate av_free_packet(). Use av_packet_unref() as replacement,            it resets the packet in a more consistent way.  9b56d5c - Deprecate av_dup_packet(), it is a no-op for most cases.            Use av_packet_ref() to make a non-refcounted AVPacket refcounted.  a9a6010 - Add av_packet_alloc(), av_packet_clone(), av_packet_free().            They match the AVFrame functions with the same name. 2015-10-21 - a17a766 - lavc 57.5.0 - avcodec.h  Add data and linesize array to AVSubtitleRect, to be used instead of  the ones from the embedded AVPicture. 2015-10-16 - dc923bc - lavc 57.0.0 - qsv.h  Add an API for allocating opaque surfaces. 2015-10-12 - 11c5f43 - 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. 2015-09-29 - 948f3c1 - lavc 57.0.0 - avcodec.h  Change type of AVPacket.duration from int to int64_t. 2015-09-18 - e3d4784 - lavc 57.2.0 - d3d11va.h  Add av_d3d11va_alloc_context(). This function must from now on be used for  allocating AVD3D11VAContext. 2015-09-07 - lavu 55.0.0  b8b5d82 - Change type of AVPixFmtDescriptor.flags from uint8_t to uint64_t.  6b3ef7f - Change type of AVComponentDescriptor fields from uint16_t to int            and drop bit packing.  2268db2 - Add step, offset, and depth to AVComponentDescriptor to replace            the deprecated step_minus1, offset_plus1, and depth_minus1. 2015-07-31 - lavu 54.17.0  7a7df34 - Add av_blowfish_alloc().  ae36545 - Add av_rc4_alloc().  5d8bea3 - Add av_xtea_alloc().  d9e8b47 - Add av_des_alloc(). 2015-07-29 - 7e38340 - lavu 54.16.0 - hmac.h  Add AV_HMAC_SHA224 and AV_HMAC_SHA256. 2015-07-27 - lavc 56.35.0 - avcodec.h  7c6eb0a - Rename CODEC_FLAG* defines to AV_CODEC_FLAG*.  def9785 - Rename CODEC_CAP_* defines to AV_CODEC_CAP_*.  059a934 - Rename FF_INPUT_BUFFER_PADDING_SIZE and FF_MIN_BUFFER_SIZE            to AV_INPUT_BUFFER_PADDING_SIZE and AV_INPUT_BUFFER_MIN_SIZE. 2015-07-20 - 5d3addb - lavc 56.33.0 - avcodec.h  Add AV_PKT_DATA_QUALITY_FACTOR to export the quality value of an AVPacket. 2015-07-02 - 1316df7 - lavu 56.15.0  Add av_version_info(). 2015-07-01 - 0d449c8 - lavfi 5.1.0 - version.h             0f87f9b - lavd 55.2.0 - version.h  Add library identification symbols, LIBAVFILTER_IDENT and LIBAVDEVICE_IDENT. 2015-06-07 - 252d620 - lavf 56.20.0 - avio.h  Add avio_put_str16be. 2015-05-13 - f7cafb5 - lavu 54.14.0 - cpu.h  Add AV_CPU_FLAG_AVXSLOW. 2015-05-13 - e7c5e17 - lavc 56.23.0  Add av_vda_default_init2. 2015-04-19 - c253340 - lavu 54.12.0  Add AV_LOG_TRACE for extremely verbose debugging. 2015-04-07 - 27f2746 - lavu 54.11.0  Add av_small_strptime(). 2015-03-29 - 6fe2641 - lavc 56.22.0  Add FF_PROFILE_DTS_EXPRESS. 2015-03-29 - c484561 - lavu 54.10.0  Add AV_PIX_FMT_MMAL for MMAL hardware acceleration. 2015-02-19 - 31d2039 - lavc 56.13  Add width, height, coded_width, coded_height and format to  AVCodecParserContext. 2015-02-19 - 5b1d9ce - 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

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