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:    2017-10-21libavdevice:   2017-10-21libavfilter:   2017-10-21libavformat:   2017-10-21libavresample: 2017-10-21libpostproc:   2017-10-21libswresample: 2017-10-21libswscale:    2017-10-21libavutil:     2017-10-21  API changes, most recent first: 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 - xxxxxxxxxx - 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 - xxxxxxxxxx - lavu 56.34.100 - pixfmt.h  Add EBU Tech. 3213-E AVColorPrimaries value 2019-08-xx - xxxxxxxxxx - lavf 58.31.101 - avio.h  4K limit removed from avio_printf. 2019-08-xx - xxxxxxxxxx - lavf 58.31.100 - avio.h  Add avio_print_string_array and avio_print. 2019-07-27 - xxxxxxxxxx - 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. 2018-01-16 - 631c56a8e4 - lavf 58.5.100 - avformat.h  Explicitly make avformat_network_init() and avformat_network_deinit() optional.  If these are not called, network initialization and deinitialization is  automatic, and unlike in older versions, fully supported, unless libavformat  is linked to ancient GnuTLS and OpenSSL. 2018-01-16 - 6512ff72f9 - lavf 58.4.100 - avformat.h  Deprecate AVStream.recommended_encoder_configuration. It was useful only for  FFserver, which has been removed. 2018-01-05 - 798dcf2432 - lavfi 7.11.101 - avfilter.h  Deprecate avfilter_link_get_channels(). Use av_buffersink_get_channels(). 2017-01-04 - c29038f304 - lavr 4.0.0 - avresample.h  Deprecate the entire library. Merged years ago to provide compatibility  with Libav, it remained unmaintained by the FFmpeg project and duplicated  functionality provided by libswresample.   In order to improve consistency and reduce attack surface, it has been deprecated.  Users of this library are asked to migrate to libswresample, which, as well as  providing more functionality, is faster and has higher accuracy. 2017-12-26 - a04c2c707d - lavc 58.9.100 - avcodec.h  Deprecate av_lockmgr_register(). You need to build FFmpeg with threading  support enabled to get basic thread-safety (which is the default build  configuration). 2017-12-24 - 8b81eabe57 - lavu 56.7.100 - cpu.h  AVX-512 flags added. 2017-12-16 - 8bf4e6d3ce - lavc 58.8.100 - avcodec.h  The MediaCodec decoders now support AVCodecContext.hw_device_ctx. 2017-12-16 - e4d9f05ca7 - lavu 56.6.100 - hwcontext.h hwcontext_mediacodec.h  Add AV_HWDEVICE_TYPE_MEDIACODEC and a new installed header with  MediaCodec-specific hwcontext definitions. 2017-12-14 - b945fed629 - lavc 58.7.100 - avcodec.h  Add AV_CODEC_CAP_HARDWARE, AV_CODEC_CAP_HYBRID, and AVCodec.wrapper_name,  and mark all AVCodecs accordingly. 2017-11-29 - d268094f88 - lavu 56.4.100 / 56.7.0 - stereo3d.h  Add view field to AVStereo3D structure and AVStereo3DView enum. 2017-11-26 - 3a71bcc213 - lavc 58.6.100 - avcodec.h  Add const to AVCodecContext.hwaccel. 2017-11-26 - 3536a3efb9 - lavc 58.5.100 - avcodec.h  Deprecate user visibility of the AVHWAccel structure and the functions  av_register_hwaccel() and av_hwaccel_next(). 2017-11-26 - 24cc0a53e9 - lavc 58.4.100 - avcodec.h  Add AVCodecHWConfig and avcodec_get_hw_config(). 2017-11-22 - 3650cb2dfa - lavu 56.3.100 - opencl.h  Remove experimental OpenCL API (av_opencl_*). 2017-11-22 - b25d8ef0a7 - lavu 56.2.100 - hwcontext.h hwcontext_opencl.h  Add AV_HWDEVICE_TYPE_OPENCL and a new installed header with  OpenCL-specific hwcontext definitions. 2017-11-22 - a050f56c09 - lavu 56.1.100 - pixfmt.h  Add AV_PIX_FMT_OPENCL. 2017-11-11 - 48e4eda11d - lavc 58.3.100 - avcodec.h  Add avcodec_get_hw_frames_parameters(). -------- 8< --------- FFmpeg 3.4 was cut here -------- 8< --------- 2017-09-28 - b6cf66ae1c - lavc 57.106.104 - avcodec.h  Add AV_PKT_DATA_A53_CC packet side data, to export closed captions 2017-09-27 - 7aa6b8a68f - lavu 55.77.101 / lavu 55.31.1 - frame.h  Allow passing the value of 0 (meaning "automatic") as the required alignment  to av_frame_get_buffer(). 2017-09-27 - 522f877086 - lavu 55.77.100 / lavu 55.31.0 - cpu.h  Add av_cpu_max_align() for querying maximum required data alignment. 2017-09-26 - b1cf151c4d - lavc 57.106.102 - 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. 2017-09-21 - 6f15f1cdc8 - lavu 55.76.100 / 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(). 2017-09-13 - 82342cead1 - lavc 57.106.100 - avcodec.h  Add AV_PKT_FLAG_TRUSTED. 2017-09-13 - 9cb23cd9fe - lavu 55.75.100 - hwcontext.h hwcontext_drm.h  Add AV_HWDEVICE_TYPE_DRM and implementation. 2017-09-08 - 5ba2aef6ec - lavfi 6.103.100 - buffersrc.h  Add av_buffersrc_close(). 2017-09-04 - 6cadbb16e9 - lavc 57.105.100 - avcodec.h  Add AV_HWACCEL_CODEC_CAP_EXPERIMENTAL, replacing the deprecated  HWACCEL_CODEC_CAP_EXPERIMENTAL flag. 2017-09-01 - 5d76674756 - lavf 57.81.100 - avio.h  Add avio_read_partial(). 2017-09-01 - xxxxxxx - lavf 57.80.100 / 57.11.0 - avio.h  Add avio_context_free(). From now on it must be used for freeing AVIOContext. 2017-08-08 - 1460408703 - lavu 55.74.100 - pixdesc.h  Add AV_PIX_FMT_FLAG_FLOAT pixel format flag. 2017-08-08 - 463b81de2b - lavu 55.72.100 - imgutils.h  Add av_image_fill_black(). 2017-08-08 - caa12027ba - lavu 55.71.100 - frame.h  Add av_frame_apply_cropping(). 2017-07-25 - 24de4fddca - lavu 55.69.100 - frame.h  Add AV_FRAME_DATA_ICC_PROFILE side data type. 2017-06-27 - 70143a3954 - lavc 57.100.100 - 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. 2017-06-27 - 3303511f33 - lavu 56.67.100 - hwcontext.h  Add AV_HWDEVICE_TYPE_D3D11VA and AV_PIX_FMT_D3D11. 2017-06-24 - 09891c5391 - lavf 57.75.100 - avio.h  Add AVIO_DATA_MARKER_FLUSH_POINT to signal preferred flush points to aviobuf. 2017-06-14 - d59c6a3aeb - lavu 55.66.100 - hwcontext.h  av_hwframe_ctx_create_derived() now takes some AV_HWFRAME_MAP_* combination  as its flags argument (which was previously unused). 2017-06-14 - 49ae8a5e87 - lavc 57.99.100 - avcodec.h  Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH. 2017-06-14 - 0b1794a43e - lavu 55.65.100 - hwcontext.h  Add AV_HWDEVICE_TYPE_NONE, av_hwdevice_find_type_by_name(),  av_hwdevice_get_type_name() and av_hwdevice_iterate_types(). 2017-06-14 - b22172f6f3 - lavu 55.64.100 - hwcontext.h  Add av_hwdevice_ctx_create_derived(). 2017-05-15 - 532b23f079 - lavc 57.96.100 - avcodec.h  VideoToolbox hardware-accelerated decoding now supports the new hwaccel API,  which can create the decoder context and allocate hardware frames automatically.  See AVCodecContext.hw_device_ctx and AVCodecContext.hw_frames_ctx. 2017-05-15 - 532b23f079 - lavu 57.63.100 - hwcontext.h  Add AV_HWDEVICE_TYPE_VIDEOTOOLBOX and implementation. 2017-05-08 - f089e02fa2 - lavc 57.95.100 / 57.31.0 - avcodec.h  Add AVCodecContext.apply_cropping to control whether cropping  is handled by libavcodec or the caller. 2017-05-08 - a47bd5d77e - lavu 55.62.100 / 55.30.0 - frame.h  Add AVFrame.crop_left/right/top/bottom fields for attaching cropping  information to video frames. 2017-xx-xx - xxxxxxxxxx  Change av_sha_update(), av_sha512_update() and av_md5_sum()/av_md5_update() length  parameter type to size_t at next major bump. 2017-05-05 - c0f17a905f - lavc 57.94.100 - avcodec.h  The cuvid decoders now support AVCodecContext.hw_device_ctx, which removes  the requirement to set an incomplete AVCodecContext.hw_frames_ctx only to  set the Cuda device handle. 2017-04-11 - 8378466507 - lavu 55.61.100 - avstring.h  Add av_strireplace(). 2016-04-06 - 157e57a181 - lavc 57.92.100 - avcodec.h  Add AV_PKT_DATA_CONTENT_LIGHT_LEVEL packet side data. 2016-04-06 - b378f5bd64 - lavu 55.60.100 - mastering_display_metadata.h  Add AV_FRAME_DATA_CONTENT_LIGHT_LEVEL value, av_content_light_metadata_alloc()  and av_content_light_metadata_create_side_data() API, and AVContentLightMetadata  type to export content light level video properties. 2017-03-31 - 9033e8723c - lavu 55.57.100 - spherical.h  Add av_spherical_projection_name().  Add av_spherical_from_name(). 2017-03-30 - 4cda23f1f1 - lavu 55.53.100 / 55.27.0 - hwcontext.h  Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags.  Add av_hwframe_ctx_create_derived(). 2017-03-29 - bfdcdd6d82 - lavu 55.52.100 - avutil.h  add av_fourcc_make_string() function and av_fourcc2str() macro to replace  av_get_codec_tag_string() from lavc. 2017-03-27 - ddef3d902f - lavf 57.68.100 - avformat.h  Deprecate that demuxers export the stream rotation angle in AVStream.metadata  (via an entry named "rotate"). Use av_stream_get_side_data() with  AV_PKT_DATA_DISPLAYMATRIX instead, and read the rotation angle with  av_display_rotation_get(). The same is done for muxing. Instead of adding a  "rotate" entry to AVStream.metadata, AV_PKT_DATA_DISPLAYMATRIX side data has  to be added to the AVStream. 2017-03-23 - 7e4ba776a2 - lavc 57.85.101 - avcodec.h  vdpau 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. 2017-03-23 - 156bd8278f - lavc 57.85.100 - avcodec.h  Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at  a later point. 2017-03-21 - fc9f14c7de - lavf 57.67.100 / 57.08.0 - avio.h  Add AVIO_SEEKABLE_TIME flag. 2017-03-21 - d682ae70b4 - lavf 57.66.105, lavc 57.83.101 - avformat.h, avcodec.h  Deprecate AVFMT_FLAG_KEEP_SIDE_DATA. It will be ignored after the next major  bump, and libavformat will behave as if it were always set.  Deprecate av_packet_merge_side_data() and av_packet_split_side_data(). 2016-03-20 - 8200b16a9c - lavu 55.50.100 / 55.21.0 - imgutils.h  Add av_image_copy_uc_from(), a version of av_image_copy() for copying  from GPU mapped memory. 2017-03-20 - 9c2436e - lavu 55.49.100 - pixdesc.h  Add AV_PIX_FMT_FLAG_BAYER pixel format flag. 2017-03-18 - 3796fb2692 - lavfi 6.77.100 - avfilter.h  Deprecate AVFilterGraph.resample_lavr_opts  It's never been used by avfilter nor passed to anything. 2017-02-10 - 1b7ffddb3a - lavu 55.48.100 / 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. 2017-03-02 - ade7c1a232 - lavc 57.81.104 - videotoolbox.h  AVVideotoolboxContext.cv_pix_fmt_type can now be set to 0 to output the  native decoder format. (The default value is not changed.) 2017-03-02 - 554bc4eea8 - lavu 55.47.101, lavc 57.81.102, lavf 57.66.103  Remove requirement to use AVOption or accessors to access certain fields  in AVFrame, AVCodecContext, and AVFormatContext that were previously  documented as "no direct access" allowed. 2017-02-13 - c1a5fca06f - lavc 57.80.100 - avcodec.h  Add AVCodecContext.hw_device_ctx. 2017-02-11 - e3af49b14b - lavu 55.47.100 - frame.h  Add AVFrame.opaque_ref. 2017-01-31 - 2eab48177d - lavu 55.46.100 / 55.20.0 - cpu.h  Add AV_CPU_FLAG_SSSE3SLOW. 2017-01-24 - c4618f842a - lavu 55.45.100 - channel_layout.h  Add av_get_extended_channel_layout() 2017-01-22 - 76c5a69e26 - lavu 55.44.100 - lfg.h  Add av_lfg_init_from_data(). 2017-01-17 - 2a4a8653b6 - lavc 57.74.100 - vaapi.h  Deprecate struct vaapi_context and the vaapi.h installed header.  Callers should set AVCodecContext.hw_frames_ctx instead. 2017-01-12 - dbe9dbed31 - lavfi 6.69.100 - buffersink.h  Add av_buffersink_get_*() functions. 2017-01-06 - 9488032e10 - lavf 57.62.100 - avio.h  Add avio_get_dyn_buf() 2016-12-10 - f542b152aa - lavu 55.43.100 - imgutils.h  Add av_image_check_size2() 2016-12-07 - e7a6f8c972 - lavc 57.67.100 / 57.29.0 - avcodec.h  Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping  information from containers. 2016-12-07 - 8f58ecc344 - lavu 55.42.100 / 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. 2016-11-18 - 2ab50647ff - lavf 57.58.100 - avformat.h  Add av_stream_add_side_data(). 2016-11-13 - 775a8477b7 - lavu 55.39.100 - hwcontext_vaapi.h  Add AV_VAAPI_DRIVER_QUIRK_ATTRIB_MEMTYPE. 2016-11-13 - a8d51bb424 - lavu 55.38.100 - hwcontext_vaapi.h  Add driver quirks field to VAAPI-specific hwdevice and enum with  members AV_VAAPI_DRIVER_QUIRK_* to represent its values. 2016-11-10 - 638b216d4f - lavu 55.36.100 - pixfmt.h  Add AV_PIX_FMT_GRAY12(LE/BE). -------- 8< --------- FFmpeg 3.2 was cut here -------- 8< --------- 2016-10-24 - 73ead47 - lavf 57.55.100 - avformat.h  Add AV_DISPOSITION_TIMED_THUMBNAILS 2016-10-24 - a246fef - lavf 57.54.100 - avformat.h  Add avformat_init_output() and AVSTREAM_INIT_IN_ macros 2016-10-22 - f5495c9 - lavu 55.33.100 - avassert.h  Add av_assert0_fpu() / av_assert2_fpu() 2016-10-07 - 3f9137c / 32c8359 - lavc 57.61.100 / 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.   Note: When decoding, AVFrame.pts uses the stream/packet timebase,  and not the codec timebase. 2016-09-28 - eba0414 - lavu 55.32.100 / 55.16.0 - hwcontext.h hwcontext_qsv.h  Add AV_HWDEVICE_TYPE_QSV and a new installed header with QSV-specific  hwcontext definitions. 

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