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:    2021-04-27libavdevice:   2021-04-27libavfilter:   2021-04-27libavformat:   2021-04-27libpostproc:   2021-04-27libswresample: 2021-04-27libswscale:    2021-04-27libavutil:     2021-04-27  API changes, most recent first: 2021-08-20 - xxxxxxxxxx - lavfi 8.3.100 - avfilter.H  Add avfilter_filter_pad_count() as a replacement for avfilter_pad_count(). 2021-08-17 - xxxxxxxxxx - lavu 57.4.101 - opt.h  av_opt_copy() now guarantees that allocated src and dst options  don't alias each other even on error. 2021-08-14 - xxxxxxxxxx - lavu 57.4.100 - imgutils.h  Add av_image_copy_plane_uc_from() 2021-08-02 - xxxxxxxxxx - lavc 59.4.100 - packet.h  Add AVPacket.opaque, AVPacket.opaque_ref, AVPacket.time_base. 2021-07-23 - xxxxxxxxxx - lavu 57.3.100 - common.h macros.h  Move several macros (AV_NE, FFDIFFSIGN, FFMAX, FFMAX3, FFMIN, FFMIN3,  FFSWAP, FF_ARRAY_ELEMS, MKTAG, MKBETAG) from common.h to macros.h. 2021-07-22 - xxxxxxxxxx - lavu 57.2.100 - film_grain_params.h  Add AV_FILM_GRAIN_PARAMS_H274, AVFilmGrainH274Params 2021-07-19 - xxxxxxxxxx - lavu 57.1.100 - cpu.h  Add av_cpu_force_count() 2021-06-17 - xxxxxxxxxx - lavc 59.2.100 - packet.h  Add AV_PKT_DATA_DYNAMIC_HDR10_PLUS 2021-06-09 - xxxxxxxxxx - lavf 59.3.100 - avformat.h  Add pts_wrap_bits to AVStream 2021-xx-xx - xxxxxxxxxx - lavc 59.1.100 - avcodec.h codec.h  Move av_get_profile_name() from avcodec.h to codec.h. 2021-xx-xx - xxxxxxxxxx - lavc 59.1.100 - avcodec.h codec_par.h  Move av_get_audio_frame_duration2() from avcodec.h to codec_par.h. 2021-xx-xx - xxxxxxxxxx - lavc 59.1.100 - avcodec.h codec_id.h  Move av_get_bits_per_sample(), av_get_exact_bits_per_sample(),  avcodec_profile_name(), and av_get_pcm_codec() from avcodec.h  to codec_id.h. 2021-xx-xx - xxxxxxxxxx - lavc 59.1.100 - avcodec.h defs.h  Add new installed header defs.h. The following definitions are moved  into it from avcodec.h:    - AVDiscard    - AVAudioServiceType    - AVPanScan    - AVCPBProperties and av_cpb_properties_alloc()    - AVProducerReferenceTime    - av_xiphlacing() 2021-04-27 - cb3ac722f4 - lavc 59.0.100 - avcodec.h  Constified AVCodecParserContext.parser. 2021-04-27 - 8b3e6ce5f4 - lavd 59.0.100 - avdevice.h  The av_*_device_next API functions now accept and return  pointers to const AVInputFormat resp. AVOutputFormat. 2021-04-27 - d7e0d428fa - lavd 59.0.100 - avdevice.h  avdevice_list_input_sources and avdevice_list_output_sinks now accept  pointers to const AVInputFormat resp. const AVOutputFormat. 2021-04-27 - 46dac8cf3d - lavf 59.0.100 - avformat.h  av_find_best_stream now uses a const AVCodec ** parameter  for the returned decoder. 2021-04-27 - 626535f6a1 - lavc 59.0.100 - codec.h  avcodec_find_encoder_by_name(), avcodec_find_encoder(),  avcodec_find_decoder_by_name() and avcodec_find_decoder()  now return a pointer to const AVCodec. 2021-04-27 - 14fa0a4efb - lavf 59.0.100 - avformat.h  Constified AVFormatContext.*_codec. 2021-04-27 - 56450a0ee4 - lavf 59.0.100 - avformat.h  Constified the pointers to AVInputFormats and AVOutputFormats  in AVFormatContext, avformat_alloc_output_context2(),  av_find_input_format(), av_probe_input_format(),  av_probe_input_format2(), av_probe_input_format3(),  av_probe_input_buffer2(), av_probe_input_buffer(),  avformat_open_input(), av_guess_format() and av_guess_codec().  Furthermore, constified the AVProbeData in av_probe_input_format(),  av_probe_input_format2() and av_probe_input_format3(). 2021-04-19 - 18af1ea8d1 - lavu 56.74.100 - tx.h  Add AV_TX_FULL_IMDCT and AV_TX_UNALIGNED. 2021-04-17 - f1bf465aa0 - lavu 56.73.100 - frame.h detection_bbox.h  Add AV_FRAME_DATA_DETECTION_BBOXES 2021-04-06 - 557953a397 - lavf 58.78.100 - avformat.h  Add avformat_index_get_entries_count(), avformat_index_get_entry(),  and avformat_index_get_entry_from_timestamp(). 2021-03-21 - a77beea6c8 - lavu 56.72.100 - frame.h  Deprecated av_get_colorspace_name().  Use av_color_space_name() instead. -------- 8< --------- FFmpeg 4.4 was cut here -------- 8< --------- 2021-03-19 - e8c0bca6bd - lavu 56.69.100 - adler32.h  Added a typedef for the type of the Adler-32 checksums  used by av_adler32_update(). It will be changed to uint32_t  at the next major bump.  The type of the parameter for the length of the input buffer  will also be changed to size_t at the next major bump. 2021-03-19 - e318438f2f - lavf 58.75.100  - avformat.h  AVChapter.id will be changed from int to int64_t  on the next major version bump. 2021-03-17 - f7db77bd87 - lavc 58.133.100 - codec.h  Deprecated av_init_packet(). Once removed, sizeof(AVPacket) will  no longer be a part of the public ABI.  Deprecated AVPacketList. 2021-03-16 - 7d09579190 - lavc 58.132.100 - codec.h  Add AV_CODEC_CAP_OTHER_THREADS as a new name for  AV_CODEC_CAP_AUTO_THREADS. AV_CODEC_CAP_AUTO_THREADS  is now deprecated. 2021-03-12 - 6e7e3a3820 - lavc 58.131.100 - avcodec.h codec.h  Add a get_encode_buffer callback to AVCodecContext, similar to  get_buffer2 but for encoders.  Add avcodec_default_get_encode_buffer().  Add AV_GET_ENCODE_BUFFER_FLAG_REF.  Encoders may now be flagged as AV_CODEC_CAP_DR1 capable. 2021-03-10 - 42e68fe015 - lavf 58.72.100 - avformat.h  Change AVBufferRef related AVStream function and struct size  parameter and fields type to size_t at next major bump. 2021-03-10 - d79e0fe65c - lavc 58.130.100 - packet.h  Change AVBufferRef related AVPacket function and struct size  parameter and fields type to size_t at next major bump. 2021-03-10 - 14040a1d91 - lavu 56.68.100 - buffer.h frame.h  Change AVBufferRef and relevant AVFrame function and struct size  parameter and fields type to size_t at next major bump. 2021-03-04 - a0eec776b6 - lavc 58.128.101 - avcodec.h  Enable err_recognition to be set for encoders. 2021-03-03 - 2ff40b98ec - lavf 58.70.100 - avformat.h  Deprecate AVFMT_FLAG_PRIV_OPT. It will do nothing  as soon as av_demuxer_open() is removed. 2021-02-27 - dd9227e48f - lavc 58.126.100 - avcodec.h  Deprecated avcodec_get_frame_class(). 2021-02-21 - 5ca40d6d94 - lavu 56.66.100 - tx.h  Add enum AVTXFlags and AVTXFlags.AV_TX_INPLACE 2021-02-14 - 4f49ca7bbc - lavd 58.12.100 - avdevice.h  Deprecated avdevice_capabilities_create() and  avdevice_capabilities_free(). 2021-02-10 - 1bda9bb68a - lavu 56.65.100 - common.h  Add FFABS64U() 2021-01-26 - 5dd9567080 - lavu 56.64.100 - common.h  Add FFABSU() 2021-01-25 - 56709ca8aa - lavc 58.119.100 - avcodec.h  Deprecate AVCodecContext.debug_mv, FF_DEBUG_VIS_MV_P_FOR, FF_DEBUG_VIS_MV_B_FOR,  FF_DEBUG_VIS_MV_B_BACK 2021-01-11 - ebdd33086a - lavc 58.116.100 - avcodec.h  Add FF_PROFILE_VVC_MAIN_10 and FF_PROFILE_VVC_MAIN_10_444. 2020-01-01 - baecaa16c1 - lavu 56.63.100 - video_enc_params.h  Add AV_VIDEO_ENC_PARAMS_MPEG2 2020-12-03 - eca12f4d5a - lavu 56.62.100 - timecode.h  Add av_timecode_init_from_components. 2020-11-27 - a83098ab03 - lavc 58.114.100 - avcodec.h  Deprecate AVCodecContext.thread_safe_callbacks. Starting with  LIBAVCODEC_VERSION_MAJOR=60, user callbacks must always be  thread-safe when frame threading is used. 2020-11-25 - d243dd540a - lavc 58.113.100 - avcodec.h  Adds a new flag AV_CODEC_EXPORT_DATA_FILM_GRAIN for export_side_data. 2020-11-25 - 4f9ee87253 - lavu 56.61.100 - film_grain_params.h  Adds a new API for extracting codec film grain parameters as side data.  Adds a new AVFrameSideDataType entry AV_FRAME_DATA_FILM_GRAIN_PARAMS for it. 2020-10-28 - f95d9510ff - lavf 58.64.100 - avformat.h  Add AVSTREAM_EVENT_FLAG_NEW_PACKETS. 2020-09-28 - 68918d3b7f - lavu 56.60.100 - buffer.h  Add a av_buffer_replace() convenience function. 2020-09-13 - 837b6eb90e - lavu 56.59.100 - timecode.h  Add av_timecode_make_smpte_tc_string2. 2020-08-21 - 06f2651204 - lavu 56.58.100 - avstring.h  Deprecate av_d2str(). Use av_asprintf() instead. 2020-08-04 - 34de0abbe7 - lavu 56.58.100 - channel_layout.h  Add AV_CH_LAYOUT_22POINT2 together with its newly required pieces:  AV_CH_TOP_SIDE_LEFT, AV_CH_TOP_SIDE_RIGHT, AV_CH_BOTTOM_FRONT_CENTER,  AV_CH_BOTTOM_FRONT_LEFT, AV_CH_BOTTOM_FRONT_RIGHT. 2020-07-23 - 84655b7101 - lavu 56.57.100 - cpu.h  Add AV_CPU_FLAG_MMI and AV_CPU_FLAG_MSA. 2020-07-22 - 3a8e927176 - lavu 56.56.100 - imgutils.h  Add av_image_fill_plane_sizes(). 2020-07-15 - 448a9aaa78 - lavc 58.96.100 - packet.h  Add AV_PKT_DATA_S12M_TIMECODE. 2020-06-12 - b09fb030c1 - lavu 56.55.100 - pixdesc.h  Add AV_PIX_FMT_X2RGB10. 2020-06-11 - bc8ab084fb - lavu 56.54.100 - frame.h  Add AV_FRAME_DATA_SEI_UNREGISTERED. 2020-06-10 - 1b4a98b029 - lavu 56.53.100 - log.h opt.h  Add av_opt_child_class_iterate() and AVClass.child_class_iterate().  Deprecate av_opt_child_class_next() and AVClass.child_class_next(). -------- 8< --------- FFmpeg 4.3 was cut here -------- 8< --------- 2020-06-05 - ec39c2276a - lavu 56.50.100 - buffer.h  Passing NULL as alloc argument to av_buffer_pool_init2() is now allowed. 2020-05-27 - ba6cada92e - lavc 58.88.100 - avcodec.h codec.h  Move AVCodec-related public API to new header codec.h. 2020-05-23 - 064b875e89 - lavu 56.49.100 - video_enc_params.h  Add AV_VIDEO_ENC_PARAMS_H264. 2020-05-23 - 2e08b39444 - lavu 56.48.100 - hwcontext.h  Add av_hwdevice_ctx_create_derived_opts. 2020-05-23 - 6b65c4ec54 - lavu 56.47.100 - rational.h  Add av_gcd_q(). 2020-05-22 - af9e622776 - lavu 56.46.101 - opt.h  Add AV_OPT_FLAG_CHILD_CONSTS. 2020-05-22 - 9d443c3e68 - lavc 58.87.100 - avcodec.h codec_par.h  Move AVBitstreamFilter-related public API to new header bsf.h.  Move AVCodecParameters-related public API to new header codec_par.h. 2020-05-21 - 13b1bbff0b - lavc 58.86.101 - avcodec.h  Deprecated AV_CODEC_CAP_INTRA_ONLY and AV_CODEC_CAP_LOSSLESS. 2020-05-17 - 84af196c65 - lavu 56.46.100 - common.h  Add av_sat_add64() and av_sat_sub64() 2020-05-12 - 991d417692 - lavu 56.45.100 - video_enc_params.h                          lavc 58.84.100 - avcodec.h  Add a new API for exporting video encoding information.  Replaces the deprecated API for exporting QP tables from decoders.  Add AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS to request this information from  decoders. 2020-05-10 - dccd07f66d - lavu 56.44.100 - hwcontext_vulkan.h  Add enabled_inst_extensions, num_enabled_inst_extensions, enabled_dev_extensions  and num_enabled_dev_extensions fields to AVVulkanDeviceContext 2020-04-22 - 0e1db79e37 - lavc 58.81.100 - packet.h                        - lavu 56.43.100 - dovi_meta.h  Add AV_PKT_DATA_DOVI_CONF and AVDOVIDecoderConfigurationRecord. 2020-04-15 - 22b25b3ea5 - lavc 58.79.100 - avcodec.h  Add formal support for calling avcodec_flush_buffers() on encoders.  Encoders that set the cap AV_CODEC_CAP_ENCODER_FLUSH will be flushed.  For all other encoders, the call is now a no-op rather than undefined  behaviour. 2020-04-10 - 672946c7fe - lavc 58.78.100 - avcodec.h codec_desc.h codec_id.h packet.h  Move AVCodecDesc-related public API to new header codec_desc.h.  Move AVCodecID enum to new header codec_id.h.  Move AVPacket-related public API to new header packet.h. 2020-03-29 - 4cb0dda555 - lavf 58.42.100 - avformat.h  av_read_frame() now guarantees to handle uninitialized input packets  and to return refcounted packets on success. 2020-03-27 - c52ec0367d - lavc 58.77.100 - avcodec.h  av_packet_ref() now guarantees to return the destination packet  in a blank state on error. 2020-03-10 - 05d27f342b - lavc 58.75.100 - avcodec.h  Add AV_PKT_DATA_ICC_PROFILE. 2020-02-21 - d005a7cdfd - lavc 58.73.101 - avcodec.h  Add AV_CODEC_EXPORT_DATA_PRFT. 2020-02-21 - c666689491 - lavc 58.73.100 - avcodec.h  Add AVCodecContext.export_side_data and AV_CODEC_EXPORT_DATA_MVS. 2020-02-13 - e8f054b095 - lavu 56.41.100 - tx.h  Add AV_TX_INT32_FFT and AV_TX_INT32_MDCT 2020-02-12 - 3182114f88 - lavu 56.40.100 - log.h  Add av_log_once(). 2020-02-04 - a88449ffb2 - lavu 56.39.100 - hwcontext.h  Add AV_PIX_FMT_VULKAN  Add AV_HWDEVICE_TYPE_VULKAN and implementation. 2020-01-30 - 27529eeb27 - lavf 58.37.100 - avio.h  Add avio_protocol_get_class(). 2020-01-15 - 717b2074ec - lavc 58.66.100 - avcodec.h  Add AV_PKT_DATA_PRFT and AVProducerReferenceTime. 2019-12-27 - 45259a0ee4 - lavu 56.38.100 - eval.h  Add av_expr_count_func(). 2019-12-26 - 16685114d5 - lavu 56.37.100 - buffer.h  Add av_buffer_pool_buffer_get_opaque(). 2019-11-17 - 1c23abc88f - lavu 56.36.100 - eval API  Add av_expr_count_vars(). 2019-10-14 - f3746d31f9 - lavu 56.35.101 - opt.h  Add AV_OPT_FLAG_RUNTIME_PARAM. 2019-09-25 - f8406ab4b9 - lavc 58.59.100 - avcodec.h  Add max_samples 2019-09-04 - 2a9d461abc - lavu 56.35.100 - hwcontext_videotoolbox.h  Add av_map_videotoolbox_format_from_pixfmt2() for full range pixfmt 2019-09-01 - 8821d1f56e - lavu 56.34.100 - pixfmt.h  Add EBU Tech. 3213-E AVColorPrimaries value 2019-08-17 - 95fa73a2b4 - lavf 58.31.101 - avio.h  4K limit removed from avio_printf. 2019-08-17 - a82f8f2f10 - lavf 58.31.100 - avio.h  Add avio_print_string_array and avio_print. 2019-07-27 - 42e2319ba9 - lavu 56.33.100 - tx.h  Add AV_TX_DOUBLE_FFT and AV_TX_DOUBLE_MDCT -------- 8< --------- FFmpeg 4.2 was cut here -------- 8< --------- 2019-06-21 - a30e44098a - lavu 56.30.100 - frame.h  Add FF_DECODE_ERROR_DECODE_SLICES 2019-06-14 - edfced8c04 - lavu 56.29.100 - frame.h  Add FF_DECODE_ERROR_CONCEALMENT_ACTIVE 2019-05-15 - b79b29ddb1 - lavu 56.28.100 - tx.h  Add av_tx_init(), av_tx_uninit() and related definitions. 2019-04-20 - 3153a6502a - lavc 58.52.100 - avcodec.h  Add AV_CODEC_FLAG_DROPCHANGED to allow avcodec_receive_frame to drop  frames whose parameters differ from first decoded frame in stream. 2019-04-12 - abfeba9724 - lavf 58.27.102  Rename hls,applehttp demuxer to hls 2019-01-27 - 5bcefceec8 - lavc 58.46.100 - avcodec.h  Add discard_damaged_percentage 2019-01-08 - 1ef4828276 - lavu 56.26.100 - frame.h  Add AV_FRAME_DATA_REGIONS_OF_INTEREST 2018-12-21 - 2744d6b364 - lavu 56.25.100 - hdr_dynamic_metadata.h  Add AV_FRAME_DATA_DYNAMIC_HDR_PLUS enum value, av_dynamic_hdr_plus_alloc(),  av_dynamic_hdr_plus_create_side_data() functions, and related structs. -------- 8< --------- FFmpeg 4.1 was cut here -------- 8< --------- 2018-10-27 - 718044dc19 - lavu 56.21.100 - pixdesc.h  Add av_read_image_line2(), av_write_image_line2() 2018-10-24 - f9d4126f28 - lavu 56.20.100 - frame.h  Add AV_FRAME_DATA_S12M_TIMECODE 2018-10-11 - f6d48b618a - lavc 58.33.100 - mediacodec.h  Add av_mediacodec_render_buffer_at_time(). 2018-09-09 - 35498c124a - lavc 58.29.100 - avcodec.h  Add AV_PKT_DATA_AFD 2018-08-16 - b33f5299a5 - lavc 58.23.100 - avcodec.h  Add av_bsf_flush(). 2018-05-18 - 2b2f2f65f3 - lavf 58.15.100 - avformat.h  Add pmt_version field to AVProgram 2018-05-17 - 5dfeb7f081 - lavf 58.14.100 - avformat.h  Add AV_DISPOSITION_STILL_IMAGE 2018-05-10 - c855683427 - lavu 56.18.101 - hwcontext_cuda.h  Add AVCUDADeviceContext.stream. 2018-04-30 - 56b081da57 - lavu 56.18.100 - pixdesc.h  Add AV_PIX_FMT_FLAG_ALPHA to AV_PIX_FMT_PAL8. 2018-04-26 - 5be0410cb3 - lavu 56.17.100 - opt.h  Add AV_OPT_FLAG_DEPRECATED. 2018-04-26 - 71fa82bed6 - lavu 56.16.100 - threadmessage.h  Add av_thread_message_queue_nb_elems(). -------- 8< --------- FFmpeg 4.0 was cut here -------- 8< --------- 2018-04-03 - d6fc031caf - lavu 56.13.100 - pixdesc.h  Deprecate AV_PIX_FMT_FLAG_PSEUDOPAL and make allocating a pseudo palette  optional for API users (see AV_PIX_FMT_FLAG_PSEUDOPAL doxygen for details). 2018-04-01 - 860086ee16 - lavc 58.17.100 - avcodec.h  Add av_packet_make_refcounted(). 2018-04-01 - f1805d160d - lavfi 7.14.100 - avfilter.h  Deprecate use of avfilter_register(), avfilter_register_all(),  avfilter_next(). Add av_filter_iterate(). 2018-03-25 - b7d0d912ef - lavc 58.16.100 - avcodec.h  Add FF_SUB_CHARENC_MODE_IGNORE. 2018-03-23 - db2a7c947e - lavu 56.12.100 - encryption_info.h  Add AVEncryptionInitInfo and AVEncryptionInfo structures to hold new side-data  for encryption info. 2018-03-21 - f14ca60001 - lavc 58.15.100 - avcodec.h  Add av_packet_make_writable(). 2018-03-18 - 4b86ac27a0 - lavu 56.11.100 - frame.h  Add AV_FRAME_DATA_QP_TABLE_PROPERTIES and AV_FRAME_DATA_QP_TABLE_DATA. 2018-03-15 - e0e72539cf - lavu 56.10.100 - opt.h  Add AV_OPT_FLAG_BSF_PARAM 2018-03-07 - 950170bd3b - lavu 56.9.100 - crc.h  Add AV_CRC_8_EBU crc variant. 2018-03-07 - 2a0eb86857 - lavc 58.14.100 - mediacodec.h  Change the default behavior of avcodec_flush() on mediacodec  video decoders. To restore the previous behavior, use the new  delay_flush=1 option. 2018-03-01 - 6731f60598 - lavu 56.8.100 - frame.h  Add av_frame_new_side_data_from_buf(). 2018-02-15 - 8a8d0b319a  Change av_ripemd_update(), av_murmur3_update() and av_hash_update() length  parameter type to size_t at next major bump. 2018-02-12 - bcab11a1a2 - lavfi 7.12.100 - avfilter.h  Add AVFilterContext.extra_hw_frames. 2018-02-12 - d23fff0d8a - lavc 58.11.100 - avcodec.h  Add AVCodecContext.extra_hw_frames. 2018-02-06 - 0694d87024 - lavf 58.9.100 - avformat.h  Deprecate use of av_register_input_format(), av_register_output_format(),  av_register_all(), av_iformat_next(), av_oformat_next().  Add av_demuxer_iterate(), and av_muxer_iterate(). 2018-02-06 - 36c85d6e77 - lavc 58.10.100 - avcodec.h  Deprecate use of avcodec_register(), avcodec_register_all(),  av_codec_next(), av_register_codec_parser(), and av_parser_next().  Add av_codec_iterate() and av_parser_iterate(). 2018-02-04 - ff46124b0d - lavf 58.8.100 - avformat.h  Deprecate the current names of the RTSP "timeout", "stimeout", "user-agent"  options. Introduce "listen_timeout" as replacement for the current "timeout"  option, and "user_agent" as replacement for "user-agent". Once the deprecation  is over, the old "timeout" option will be removed, and "stimeout" will be  renamed to "stimeout" (the "timeout" option will essentially change semantics). 2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h  Deprecate AVFormatContext filename field which had limited length, use the  new dynamically allocated url field instead. 2018-01-28 - ea3672b7d6 - lavf 58.7.100 - avformat.h  Add url field to AVFormatContext and add ff_format_set_url helper function. 2018-01-27 - 6194d7e564 - lavf 58.6.100 - avformat.h  Add AVFMTCTX_UNSEEKABLE (for HLS demuxer). 2018-01-23 - 9f07cf7c00 - lavu 56.9.100 - aes_ctr.h  Add method to set the 16-byte IV.

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