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:    2015-08-28libavdevice:   2015-08-28libavfilter:   2015-08-28libavformat:   2015-08-28libavresample: 2015-08-28libpostproc:   2015-08-28libswresample: 2015-08-28libswscale:    2015-08-28libavutil:     2015-08-28  API changes, most recent first: 2016-xx-xx - lavc 57.25.0 - avcodec.h  Add AVCodecContext.hw_frames_ctx. 2016-xx-xx - lavfi 6.36.0 - avfilter.h  xxxxxxx avfilter.h - Add AVFilterLink.hw_frames_ctx.  xxxxxxx buffersrc.h - Add AVBufferSrcParameters and functions for handling it. 2016-02-xx - xxxxxxx - lavc 57.25.100  Add AV_PKT_DATA_MPEGTS_STREAM_ID for exporting the MPEGTS stream ID. 2016-xx-xx - lavu 55.18.100  xxxxxxx audio_fifo.h - Add av_audio_fifo_peek_at(). 2016-xx-xx - lavu 55.18.0  xxxxxxx buffer.h - Add av_buffer_pool_init2().  xxxxxxx hwcontext.h - Add a new installed header hwcontext.h with a new API                        for handling hwaccel frames.  xxxxxxx hwcontext_cuda.h - Add a new installed header hwcontext_cuda.h with                             CUDA-specific hwcontext definitions.  xxxxxxx hwcontext_vdpau.h - Add a new installed header hwcontext_vdpau.h with                              VDPAU-specific hwcontext definitions.  xxxxxxx pixfmt.h - Add AV_PIX_FMT_CUDA. -------- 8< --------- FFmpeg 3.0 was cut here -------- 8< --------- 2016-02-10 - bc9a596 / 9f61abc - lavf 57.25.100 / 57.3.0 - avformat.h  Add AVFormatContext.opaque, io_open and io_close, allowing custom IO 2016-02-01 - 1dba837 - lavf 57.24.100 - avformat.h, avio.h  Add protocol_whitelist to AVFormatContext, AVIOContext 2016-01-31 - 66e9d2f - lavu 55.17.100 - frame.h  Add AV_FRAME_DATA_GOP_TIMECODE for exporting MPEG1/2 GOP timecodes. 2016-01-01 - 5e8b053 / 2c68113 - lavc 57.21.100 / 57.12.0 - avcodec.h  Add AVCodecDescriptor.profiles and avcodec_profile_name(). 2015-12-28 - 1f9139b - lavf 57.21.100 - avformat.h  Add automatic bitstream filtering; add av_apply_bitstream_filters() 2015-12-22 - 39a09e9 - lavfi 6.21.101 - avfilter.h  Deprecate avfilter_link_set_closed().  Applications are not supposed to mess with links,  they should close the sinks. 2015-12-17 - lavc 57.18.100 / 57.11.0 - avcodec.h dirac.h  xxxxxxx - Add av_packet_add_side_data().  xxxxxxx - Add AVCodecContext.coded_side_data.  xxxxxxx - Add AVCPBProperties API.  xxxxxxx - Add a new public header dirac.h containing            av_dirac_parse_sequence_header() 2015-12-11 - 676a93f - lavf 57.20.100 - avformat.h  Add av_program_add_stream_index() 2015-11-29 - 93fb4a4 - lavc 57.16.101 - 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. 2015-11-22 - fe20e34 - lavc 57.16.100 - avcodec.h  Add AV_PKT_DATA_FALLBACK_TRACK for making fallback associations between  streams. 2015-11-22 - ad317c9 - lavf 57.19.100 - avformat.h  Add av_stream_new_side_data(). 2015-11-22 - e12f403 - lavu 55.8.100 - xtea.h    Add av_xtea_le_init and av_xtea_le_crypt 2015-11-18 - lavu 55.7.100 - mem.h  Add av_fast_mallocz() 2015-10-29 - lavc 57.12.100 / 57.8.0 - avcodec.h  xxxxxx - Deprecate av_free_packet(). Use av_packet_unref() as replacement,           it resets the packet in a more consistent way.  xxxxxx - Deprecate av_dup_packet(), it is a no-op for most cases.           Use av_packet_ref() to make a non-refcounted AVPacket refcounted.  xxxxxx - Add av_packet_alloc(), av_packet_clone(), av_packet_free().           They match the AVFrame functions with the same name. 2015-10-27 - 1e477a9 - lavu 55.5.100 - cpu.h  Add AV_CPU_FLAG_AESNI. 2015-10-22 - ee573b4 / a17a766 - lavc 57.9.100 / 57.5.0 - avcodec.h  Add data and linesize array to AVSubtitleRect, to be used instead of  the ones from the embedded AVPicture. 2015-10-22 - 866a417 / dc923bc - lavc 57.8.100 / 57.0.0 - qsv.h  Add an API for allocating opaque surfaces. 2015-10-15 - 2c2d162 - lavf 57.4.100  Remove the latm demuxer that was a duplicate of the loas demuxer. 2015-10-14 - b994788 / 11c5f43 - lavu 55.4.100 / 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 - b01891a / 948f3c1 - lavc 57.3.100 / 57.2.0 - avcodec.h  Change type of AVPacket.duration from int to int64_t. 2015-09-17 - 7c46f24 / e3d4784 - lavc 57.3.100 / 57.2.0 - d3d11va.h  Add av_d3d11va_alloc_context(). This function must from now on be used for  allocating AVD3D11VAContext. 2015-09-15 - lavf 57.2.100 - avformat.h  probesize and max_analyze_duration switched to 64bit, both  are only accessible through AVOptions 2015-09-15 - lavf 57.1.100 - avformat.h  bit_rate was changed to 64bit, make sure you update any  printf() or other type sensitive code 2015-09-15 - lavc 57.2.100 - avcodec.h  bit_rate/rc_max_rate/rc_min_rate were changed to 64bit, make sure you update  any printf() or other type sensitive code 2015-09-07 - lavu 55.0.100 / 55.0.0  c734b34 / b8b5d82 - Change type of AVPixFmtDescriptor.flags from uint8_t to uint64_t.  f53569a / 6b3ef7f - Change type of AVComponentDescriptor fields from uint16_t to int            and drop bit packing.  151aa2e / 2268db2 - Add step, offset, and depth to AVComponentDescriptor to replace            the deprecated step_minus1, offset_plus1, and depth_minus1. -------- 8< --------- FFmpeg 2.8 was cut here -------- 8< --------- 2015-08-27 - 1dd854e1 - lavc 56.58.100 - vaapi.h  Deprecate old VA-API context (vaapi_context) fields that were only  set and used by libavcodec. They are all managed internally now. 2015-08-19 - 9f8e57ef - lavu 54.31.100 - pixfmt.h  Add a unique pixel format for VA-API (AV_PIX_FMT_VAAPI) that  indicates the nature of the underlying storage: a VA surface. This  yields the same value as AV_PIX_FMT_VAAPI_VLD.  Deprecate old VA-API related pixel formats: AV_PIX_FMT_VAAPI_MOCO,  AV_PIX_FMT_VAAPI_IDCT, AV_PIX_FMT_VAAPI_VLD. 2015-08-02 - lavu 54.30.100 / 54.17.0  9ed59f1 / 7a7df34c -  Add av_blowfish_alloc().  a130ec9 / ae365453 -  Add av_rc4_alloc().  9ca1997 / 5d8bea3b -  Add av_xtea_alloc().  3cf08e9 / d9e8b47e -  Add av_des_alloc(). 2015-07-27 - lavc 56.56.100 / 56.35.0 - avcodec.h  94d68a4 / 7c6eb0a1 - Rename CODEC_FLAG* defines to AV_CODEC_FLAG*.  444e987 / def97856 - Rename CODEC_CAP_* defines to AV_CODEC_CAP_*.  29d147c / 059a9348 - Rename FF_INPUT_BUFFER_PADDING_SIZE and FF_MIN_BUFFER_SIZE              to AV_INPUT_BUFFER_PADDING_SIZE and AV_INPUT_BUFFER_MIN_SIZE. 2015-07-22 - c40ecff - lavc 56.51.100 - avcodec.h  Add AV_PKT_DATA_QUALITY_STATS to export the quality value, PSNR, and pict_type  of an AVPacket. 2015-07-16 - 8dad213 - lavc 56.49.100  Add av_codec_get_codec_properties(), FF_CODEC_PROPERTY_LOSSLESS  and FF_CODEC_PROPERTY_CLOSED_CAPTIONS 2015-07-03 - d563e13 / 83212943 - lavu 54.28.100 / 56.15.0  Add av_version_info(). -------- 8< --------- FFmpeg 2.7 was cut here -------- 8< --------- 2015-06-04 - cc17b43 - lswr  1.2.100  Add swr_get_out_samples() 2015-05-27 - c312bfa - lavu 54.26.100 - cpu.h  Add AV_CPU_FLAG_AVXSLOW. 2015-05-26 - 1fb9b2a - lavu 54.25.100 - rational.h  Add av_q2intfloat(). 2015-05-13 - cc48409 / e7c5e17 - lavc 56.39.100 / 56.23.0  Add av_vda_default_init2. 2015-05-11 - 541d75f - lavf 56.33.100 - avformat.h  Add AVOpenCallback AVFormatContext.open_cb 2015-05-07 - a7dd933 - 56.38.100 - avcodec.h  Add av_packet_side_data_name(). 2015-05-07 - 01e59d4 - 56.37.102 - avcodec.h  Add FF_PROFILE_VP9_2 and FF_PROFILE_VP9_3. 2015-05-04 - 079b7f6 - 56.37.100 - avcodec.h  Add FF_PROFILE_VP9_0 and FF_PROFILE_VP9_1. 2015-04-22 - 748d481 - lavf 56.31.100 - avformat.h  Add AVFMT_FLAG_FAST_SEEK flag. Some formats (initially mp3) use it to enable  fast, but inaccurate seeking. 2015-04-20 - 8e8219e / c253340 - lavu 54.23.100 / 54.12.0 - log.h  Add AV_LOG_TRACE for extremely verbose debugging. 2015-04-02 - 26e0e393 - lavf 56.29.100 - avio.h  Add AVIODirEntryType.AVIO_ENTRY_SERVER.  Add AVIODirEntryType.AVIO_ENTRY_SHARE.  Add AVIODirEntryType.AVIO_ENTRY_WORKGROUP. 2015-03-31 - 3188696 - lavu 54.22.100 - avstring.h  Add av_append_path_component() 2015-03-27 - 184084c - lavf 56.27.100 - avio.h url.h  New directory listing API.   Add AVIODirEntryType enum.  Add AVIODirEntry, AVIODirContext structures.  Add avio_open_dir(), avio_read_dir(), avio_close_dir(), avio_free_directory_entry().  Add ff_alloc_dir_entry().  Extend URLProtocol with url_open_dir(), url_read_dir(), url_close_dir(). 2015-03-29 - 268ff17 / c484561 - lavu 54.21.100 / 54.10.0 - pixfmt.h  Add AV_PIX_FMT_MMAL for MMAL hardware acceleration. 2015-03-19 - 11fe56c - 56.29.100 / lavc 56.22.0  Add FF_PROFILE_DTS_EXPRESS. -------- 8< --------- FFmpeg 2.6 was cut here -------- 8< --------- 2015-03-04 - cca4476 - lavf 56.25.100  Add avformat_flush() 2015-03-03 - 81a9126 - lavf 56.24.100  Add avio_put_str16be() 2015-02-19 - 560eb71 / 31d2039 - lavc 56.23.100 / 56.13.0  Add width, height, coded_width, coded_height and format to  AVCodecParserContext. 2015-02-19 - e375511 / 5b1d9ce - lavu 54.19.100 / 54.9.0  Add AV_PIX_FMT_QSV for QSV hardware acceleration. 2015-02-14 - ba22295 - lavc 56.21.102  Deprecate VIMA decoder. 2015-01-27 - 62a82c6 / 728685f - lavc 56.21.100 / 56.12.0, lavu 54.18.100 / 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. 2015-01-16 - a47c933 - lavf 56.19.100 - avformat.h  Add data_codec and data_codec_id for storing codec of data stream 2015-01-11 - 007c33d - lavd 56.4.100 - avdevice.h  Add avdevice_list_input_sources().  Add avdevice_list_output_sinks(). 2014-12-25 - d7aaeea / c220a60 - lavc 56.19.100 / 56.10.0 - vdpau.h  Add av_vdpau_get_surface_parameters(). 2014-12-25 - ddb9a24 / 6c99c92 - lavc 56.18.100 / 56.9.0 - avcodec.h  Add AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH flag to av_vdpau_bind_context(). 2014-12-25 - d16079a / 57b6704 - lavc 56.17.100 / 56.8.0 - avcodec.h  Add AVCodecContext.sw_pix_fmt. 2014-12-04 - 6e9ac02 - lavc 56.14.100 - dv_profile.h  Add av_dv_codec_profile2(). -------- 8< --------- FFmpeg 2.5 was cut here -------- 8< --------- 2014-11-21 - ab922f9 - lavu 54.15.100 - dict.h   Add av_dict_get_string(). 2014-11-18 - a54a51c - lavu 54.14.100 - float_dsp.h  Add avpriv_float_dsp_alloc(). 2014-11-16 - 6690d4c3 - lavf 56.13.100 - avformat.h  Add AVStream.recommended_encoder_configuration with accessors. 2014-11-16 - bee5844d - lavu 54.13.100 - opt.h  Add av_opt_serialize(). 2014-11-16 - eec69332 - lavu 54.12.100 - opt.h  Add av_opt_is_set_to_default(). 2014-11-06 - 44fa267 / 5e80fb7 - lavc 56.11.100 / 56.6.0 - vorbis_parser.h  Add a public API for parsing vorbis packets. 2014-10-15 - 17085a0 / 7ea1b34 - lavc 56.7.100 / 56.5.0 - avcodec.h  Replace AVCodecContext.time_base used for decoding  with AVCodecContext.framerate. 2014-10-15 - 51c810e / d565fef1 - lavc 56.6.100 / 56.4.0 - avcodec.h  Add AV_HWACCEL_FLAG_IGNORE_LEVEL flag to av_vdpau_bind_context(). 2014-10-13 - da21895 / 2df0c32e - lavc 56.5.100 / 56.3.0 - avcodec.h  Add AVCodecContext.initial_padding. Deprecate the use of AVCodecContext.delay  for audio encoding. 2014-10-08 - bb44f7d / 5a419b2 - lavu 54.10.100 / 54.4.0 - pixdesc.h  Add API to return the name of frame and context color properties. 2014-10-06 - a61899a / e3e158e - lavc 56.3.100 / 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(). 2014-10-02 - cdd6f05 - lavc 56.2.100 - avcodec.h2014-10-02 - cdd6f05 - lavu 54.9.100 - frame.h  Add AV_FRAME_DATA_SKIP_SAMPLES. Add lavc CODEC_FLAG2_SKIP_MANUAL and  AVOption "skip_manual", which makes lavc export skip information via  AV_FRAME_DATA_SKIP_SAMPLES AVFrame side data, instead of skipping and  discarding samples automatically. 2014-10-02 - 0d92b0d - lavu 54.8.100 - avstring.h  Add av_match_list() 2014-09-24 - ac68295 - libpostproc 53.1.100  Add visualization support 2014-09-19 - 6edd6a4 - lavc 56.1.101 - dv_profile.h  deprecate avpriv_dv_frame_profile2(), which was made public by accident.  -------- 8< --------- FFmpeg 2.4 was cut here -------- 8< --------- 2014-08-25 - 215db29 / b263f8f - lavf 56.3.100 / 56.3.0 - avformat.h  Add AVFormatContext.max_ts_probe. 2014-08-28 - f30a815 / 9301486 - lavc 56.1.100 / 56.1.0 - avcodec.h  Add AV_PKT_DATA_STEREO3D to export container-level stereo3d information. 2014-08-23 - 8fc9bd0 - lavu 54.7.100 - dict.h  AV_DICT_DONT_STRDUP_KEY and AV_DICT_DONT_STRDUP_VAL arguments are now  freed even on error. This is consistent with the behaviour all users  of it we could find expect. 2014-08-21 - 980a5b0 - lavu 54.6.100 - frame.h motion_vector.h  Add AV_FRAME_DATA_MOTION_VECTORS side data and AVMotionVector structure 2014-08-16 - b7d5e01 - lswr 1.1.100 - swresample.h  Add AVFrame based API 2014-08-16 - c2829dc - lavu 54.4.100 - dict.h  Add av_dict_set_int helper function. 2014-08-13 - c8571c6 / 8ddc326 - lavu 54.3.100 / 54.3.0 - mem.h  Add av_strndup(). 2014-08-13 - 2ba4577 / a8c104a - lavu 54.2.100 / 54.2.0 - 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 - 78eaaa8 / fb1ddcd - lavr 2.1.0 - avresample.h  Add avresample_convert_frame() and avresample_config(). 2014-08-10 - 78eaaa8 / fb1ddcd - lavu 54.1.100 / 54.1.0 - error.h  Add AVERROR_INPUT_CHANGED and AVERROR_OUTPUT_CHANGED. 2014-08-08 - 3841f2a / d35b94f - lavc 55.73.102 / 55.57.4 - avcodec.h  Deprecate FF_IDCT_XVIDMMX define and xvidmmx idct option.  Replaced by FF_IDCT_XVID and xvid respectively. 2014-08-08 - 5c3c671 - lavf 55.53.100 - avio.h  Add avio_feof() and deprecate url_feof(). 2014-08-07 - bb78903 - lsws 2.1.3 - swscale.h  sws_getContext is not going to be removed in the future. 2014-08-07 - a561662 / ad1ee5f - lavc 55.73.101 / 55.57.3 - avcodec.h  reordered_opaque is not going to be removed in the future. 2014-08-02 - 28a2107 - lavu 52.98.100 - pixelutils.h  Add pixelutils API with SAD functions 2014-08-04 - 6017c98 / e9abafc - lavu 52.97.100 / 53.22.0 - pixfmt.h  Add AV_PIX_FMT_YA16 pixel format for 16 bit packed gray with alpha. 2014-08-04 - 4c8bc6f / e96c3b8 - lavu 52.96.101 / 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 - 073c074 / d2962e9 - lavu 52.96.100 / 53.21.0 - pixdesc.h  Support name aliases for pixel formats. 2014-08-03 - 71d008e / 1ef9e83 - lavc 55.72.101 / 55.57.2 - avcodec.h2014-08-03 - 71d008e / 1ef9e83 - lavu 52.95.100 / 53.20.0 - frame.h  Deprecate AVCodecContext.dtg_active_format and use side-data instead. 2014-08-03 - e680c73 - lavc 55.72.100 - avcodec.h  Add get_pixels() to AVDCT 2014-08-03 - 9400603 / 9f17685 - lavc 55.71.101 / 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. 2014-07-30 - ba3e331 - lavu 52.94.100 - frame.h  Add av_frame_side_data_name() 2014-07-29 - 80a3a66 / 3a19405 - lavf 56.01.100 / 56.01.0 - avformat.h  Add mime_type field to AVProbeData, which now MUST be initialized in  order to avoid uninitialized reads of the mime_type pointer, likely  leading to crashes.  Typically, this means you will do 'AVProbeData pd = { 0 };' instead of  'AVProbeData pd;'. 2014-07-29 - 31e0b5d / 69e7336 - lavu 52.92.100 / 53.19.0 - avstring.h  Make name matching function from lavf public as av_match_name(). 2014-07-28 - 2e5c8b0 / c5fca01 - lavc 55.71.100 / 55.57.0 - avcodec.h  Add AV_CODEC_PROP_REORDER to mark codecs supporting frame reordering. 2014-07-27 - ff9a154 - lavf 55.50.100 - avformat.h  New field int64_t probesize2 instead of deprecated  field int probesize. 2014-07-27 - 932ff70 - lavc 55.70.100 - avdct.h  Add AVDCT / avcodec_dct_alloc() / avcodec_dct_init(). 2014-07-23 - 8a4c086 - lavf 55.49.100 - avio.h  Add avio_read_to_bprint()  -------- 8< --------- FFmpeg 2.3 was cut here -------- 8< --------- 2014-07-14 - 62227a7 - lavf 55.47.100 - avformat.h  Add av_stream_get_parser() 2014-07-09 - c67690f / a54f03b - lavu 52.92.100 / 53.18.0 - display.h  Add av_display_matrix_flip() to flip the transformation matrix. 2014-07-09 - 1b58f13 / f6ee61f - lavc 55.69.100 / 55.56.0 - dv_profile.h  Add a public API for DV profile handling. 2014-06-20 - 0dceefc / 9e500ef - lavu 52.90.100 / 53.17.0 - imgutils.h  Add av_image_check_sar(). 2014-06-20 - 4a99333 / 874390e - lavc 55.68.100 / 55.55.0 - avcodec.h  Add av_packet_rescale_ts() to simplify timestamp conversion. 2014-06-18 - ac293b6 / 194be1f - lavf 55.44.100 / 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. 2014-06-11 - 67d29da - lavc 55.66.101 - avcodec.h  Increase FF_INPUT_BUFFER_PADDING_SIZE to 32 due to some corner cases needing  it 2014-06-10 - 5482780 - lavf 55.43.100 - avformat.h  New field int64_t max_analyze_duration2 instead of deprecated  int max_analyze_duration. 2014-05-30 - 00759d7 - lavu 52.89.100 - opt.h  Add av_opt_copy() 2014-06-01 - 03bb99a / 0957b27 - lavc 55.66.100 / 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 - 6e8e9f1 / 8c02adc - lavu 52.88.100 / 53.16.0 - frame.h, pixfmt.h  Move all color-related enums (AVColorPrimaries, AVColorSpace, AVColorRange,  AVColorTransferCharacteristic, and AVChromaLocation) inside lavu.  And add AVFrame fields for them. 2014-05-29 - bdb2e80 / b2d4565 - lavr 1.3.0 - avresample.h  Add avresample_max_output_samples 2014-05-28 - d858ee7 / 6d21259 - lavf 55.42.100 / 55.19.0 - avformat.h  Add strict_std_compliance and related AVOptions to support experimental  muxing. 2014-05-26 - 55cc60c - lavu 52.87.100 - threadmessage.h  Add thread message queue API. 2014-05-26 - c37d179 - lavf 55.41.100 - avformat.h  Add format_probesize to AVFormatContext. 2014-05-20 - 7d25af1 / c23c96b - lavf 55.39.100 / 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(). 2014-05-20 - 7336e39 - lavu 52.86.100 - fifo.h  Add av_fifo_alloc_array() function. 2014-05-19 - ef1d4ee / bddd8cb - lavu 52.85.100 / 53.15.0 - frame.h, display.h  Add AV_FRAME_DATA_DISPLAYMATRIX for exporting frame-level

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