Never assume the API of libav* to be stable unless at least 1 month has passedsince the last major version increase or the API was added. The last version increases were:libavcodec:    2013-03-xxlibavdevice:   2013-03-xxlibavfilter:   2013-12-xxlibavformat:   2013-03-xxlibavresample: 2012-10-05libpostproc:   2011-04-18libswresample: 2011-09-19libswscale:    2011-06-20libavutil:     2012-10-22  API changes, most recent first: 2014-01-27 - 102bd64 - lavd 55.7.100 - avdevice.h                       lavf 55.28.100 - avformat.h    Add avdevice_dev_to_app_control_message() function 2014-01-27 - 7151411 - lavd 55.6.100 - avdevice.h                       lavf 55.27.100 - avformat.h    Add avdevice_app_to_dev_control_message() function 2014-01-24 - 86bee79 - lavf 55.26.100 - avformat.h    New AVFormatContext option metadata_header_padding to allow control over the    amount of padding added. 2014-01-xx - xxxxxxx - 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(). 2014-01-19 - xxxxxxx - lavf 55.25.100 - avformat.h    Add avformat_get_mov_video_tags() and avformat_get_mov_audio_tags(). 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

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