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: 2017-09-26 - xxxxxxx - 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-xx-xx - xxxxxxx - 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 - xxxxxxx - lavc 57.106.100 - avcodec.h  Add AV_PKT_FLAG_TRUSTED. 2017-09-13 - xxxxxxx - lavu 55.75.100 - hwcontext.h hwcontext_drm.h  Add AV_HWDEVICE_TYPE_DRM and implementation. 2017-09-08 - xxxxxxx - lavfi 6.103.100 - buffersrc.h  Add av_buffersrc_close(). 2017-09-04 - xxxxxxx - lavc 57.105.100 - avcodec.h  Add AV_HWACCEL_CODEC_CAP_EXPERIMENTAL, replacing the deprecated  HWACCEL_CODEC_CAP_EXPERIMENTAL flag. 2017-09-01 - xxxxxxx - 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 - xxxxxxx - lavu 55.74.100 - pixdesc.h  Add AV_PIX_FMT_FLAG_FLOAT pixel format flag. 2017-08-08 - xxxxxxx - lavu 55.72.100 - imgutils.h  Add av_image_fill_black(). 2017-08-08 - xxxxxxx - 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-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxx - lavu 56.67.100 - hwcontext.h  Add AV_HWDEVICE_TYPE_D3D11VA and AV_PIX_FMT_D3D11. 2017-06-24 - xxxxxxx - lavf 57.75.100 - avio.h  Add AVIO_DATA_MARKER_FLUSH_POINT to signal preferred flush points to aviobuf. 2017-06-14 - xxxxxxx - 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 - xxxxxxx - lavc 57.99.100 - avcodec.h  Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH. 2017-06-14 - xxxxxxx - 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 - xxxxxxx - lavu 55.64.100 - hwcontext.h  Add av_hwdevice_ctx_create_derived(). 2017-05-15 - xxxxxxxxxx - 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 - xxxxxxxxxx - lavu 57.63.100 - hwcontext.h  Add AV_HWDEVICE_TYPE_VIDEOTOOLBOX and implementation. 2017-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxx - 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 - xxxxxxxxxx - 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. 2016-09-26 - 32c25f0 - lavc 57.59.100 / 57.23.0 - avcodec.h  AVCodecContext.hw_frames_ctx now may be used by decoders. 2016-09-27 - f0b6f72 - lavf 57.51.100 - avformat.h  Add av_stream_get_codec_timebase() 2016-09-27 - 23c0779 - lswr 2.2.100 - swresample.h  Add swr_build_matrix(). 2016-09-23 - 30d3e36 - lavc 57.58.100 - avcodec.h  Add AV_CODEC_CAP_AVOID_PROBING codec capability flag. 2016-09-14 - ae1dd0c - lavf 57.49.100 - avformat.h  Add avformat_transfer_internal_stream_timing_info helper to help with stream  copy. 2016-08-29 - 4493390 - lavfi 6.58.100 - avfilter.h  Add AVFilterContext.nb_threads. 2016-08-15 - c3c4c72 - lavc 57.53.100 - avcodec.h  Add trailing_padding to AVCodecContext to match the corresponding  field in AVCodecParameters. 2016-08-15 - b746ed7 - lavc 57.52.100 - avcodec.h  Add a new API for chained BSF filters and passthrough (null) BSF --  av_bsf_list_alloc(), av_bsf_list_free(), av_bsf_list_append(),  av_bsf_list_append2(), av_bsf_list_finalize(), av_bsf_list_parse_str()  and av_bsf_get_null_filter(). 2016-08-04 - 82a33c8 - lavf 57.46.100 - avformat.h  Add av_get_frame_filename2() 2016-07-09 - 775389f / 90f469a - lavc 57.50.100 / 57.20.0 - avcodec.h  Add FF_PROFILE_H264_MULTIVIEW_HIGH and FF_PROFILE_H264_STEREO_HIGH. 2016-06-30 - c1c7e0ab - lavf 57.41.100 - avformat.h  Moved codecpar field from AVStream to the end of the struct, so that  the following private fields are in the same location as in FFmpeg 3.0 (lavf 57.25.100). 2016-06-30 - 042fb69d - lavu 55.28.100 - frame.h  Moved hw_frames_ctx field from AVFrame to the end of the struct, so that  the following private fields are in the same location as in FFmpeg 3.0 (lavu 55.17.103). 2016-06-29 - 1a751455 - lavfi 6.47.100 - avfilter.h  Fix accidental ABI breakage in AVFilterContext.  ABI was broken in 8688d3a, lavfi 6.42.100 and released as ffmpeg 3.1.   Because of this, ffmpeg and ffplay built against lavfi>=6.42.100 will not be  compatible with lavfi>=6.47.100. Potentially also affects other users of  libavfilter if they are using one of the affected fields. -------- 8< --------- FFmpeg 3.1 was cut here -------- 8< --------- 2016-06-26 - 481f320 / 1c9e861 - lavu 55.27.100 / 55.13.0 - hwcontext.h  Add av_hwdevice_ctx_create(). 2016-06-26 - b95534b / e47b8bb - lavc 57.48.101 / 57.19.1 - avcodec.h  Adjust values for JPEG 2000 profiles. 2016-06-23 - 5d75e46 / db7968b - lavf 57.40.100 / 57.7.0 - avio.h  Add AVIODataMarkerType, write_data_type, ignore_boundary_point and  avio_write_marker. 2016-06-23 - abb3cc4 / 0c4468d - lavu 55.26.100 / 55.12.0 - opt.h  Add av_stereo3d_type_name() and av_stereo3d_from_name(). 2016-06-22 - 3689efe / c46db38 - lavu 55.25.100 / 55.11.0 - hwcontext_dxva2.h  Add new installed header with DXVA2-specific hwcontext definitions. 2016-04-27 - fb91871 - lavu 55.23.100 - log.h  Add a new function av_log_format_line2() which returns number of bytes  written to the target buffer. 2016-04-21 - 7fc329e - lavc 57.37.100 - 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(). 2016-04-17 - af9cac1 / 33d1898 - lavc 57.35.100 / 57.15.0 - avcodec.h  Add a new bitstream filtering API working with AVPackets.  Deprecate the old bitstream filtering API. 2016-04-14 - 8688d3a / 07a844f - lavfi 6.42.100 / 6.3.0 - avfilter.h  Add AVFilterContext.hw_device_ctx. 2016-04-14 - 28abb21 / 551c677 - lavu 55.22.100 / 55.9.0 - hwcontext_vaapi.h  Add new installed header with VAAPI-specific hwcontext definitions. 2016-04-14 - afccfaf / b1f01e8 - lavu 55.21.100 / 55.7.0 - hwcontext.h  Add AVHWFramesConstraints and associated API. 2016-04-11 - 6f69f7a / 9200514 - lavf 57.33.100 / 57.5.0 - avformat.h  Add AVStream.codecpar, deprecate AVStream.codec. 2016-04-02 - e8a9b64 - lavu 55.20.100 - base64.h  Add AV_BASE64_DECODE_SIZE(x) macro. 2016-xx-xx - lavc 57.33.100 / 57.14.0 - avcodec.h  f9b1cf1 / 998e1b8 - Add AVCodecParameters and its related API.  e6053b3 / a806834 - Add av_get_audio_frame_duration2(). 2016-03-11 - 6d8ab35 - lavf/lavc 57.28.101  Add requirement to bitstream filtering API that returned packets with  size == 0 and side_data_elems == 0 are to be skipped by the caller. 2016-03-04 - 9362973 - lavf 57.28.100  Add protocol blacklisting API 2016-02-28 - 4dd4d53 - lavc 57.27.101  Validate AVFrame returned by get_buffer2 to have required  planes not NULL and unused planes set to NULL as crashes  and buffer overflow are possible with certain streams if  that is not the case. 2016-02-26 - 30e7685 - lavc 57.27.100 - avcodec.h  "flags2" decoding option now allows the flag "ass_ro_flush_noop" preventing  the reset of the ASS ReadOrder field on flush. This affects the content of  AVSubtitles.rects[N]->ass when "sub_text_format" is set to "ass" (see  previous entry). 2016-02-26 - 2941282 - lavc 57.26.100 - avcodec.h  Add a "sub_text_format" subtitles decoding option allowing the values "ass"  (recommended) and "ass_with_timings" (not recommended, deprecated, default).  The default value for this option will change to "ass" at the next major  libavcodec version bump.   The current default is "ass_with_timings" for compatibility. This means that  all subtitles text decoders currently still output ASS with timings printed  as strings in the AVSubtitles.rects[N]->ass fields.   Setting "sub_text_format" to "ass" allows a better timing accuracy (ASS  timing is limited to a 1/100 time base, so this is relevant for any subtitles  format needing a bigger one), ease timing adjustments, and prevents the need  of removing the timing from the decoded string yourself. This form is also  known as "the Matroska form". The timing information (start time, duration)  can be found in the AVSubtitles fields. 2016-02-24 - 7e49cdd / 7b3214d0 - lavc 57.25.100 / 57.13.0 - avcodec.h  Add AVCodecContext.hw_frames_ctx. 2016-02-24 - 1042402 / b3dd30d - lavfi 6.36.100 / 6.2.0 - avfilter.h  avfilter.h - Add AVFilterLink.hw_frames_ctx.  buffersrc.h - Add AVBufferSrcParameters and functions for handling it. 2016-02-23 - 14f7a3d - lavc 57.25.100  Add AV_PKT_DATA_MPEGTS_STREAM_ID for exporting the MPEGTS stream ID. 2016-02-18 - 08acab8 - lavu 55.18.100 - audio_fifo.h  Add av_audio_fifo_peek_at(). 2016-xx-xx - lavu 55.18.100 / 55.6.0  26abd51 / 721a4ef buffer.h - Add av_buffer_pool_init2().  1a70878 / 89923e4 hwcontext.h - Add a new installed header hwcontext.h with a new API                        for handling hwaccel frames.  6992276 / ad884d1 hwcontext_cuda.h - Add a new installed header hwcontext_cuda.h with                             CUDA-specific hwcontext definitions.  d779d8d / a001ce3 hwcontext_vdpau.h - Add a new installed header hwcontext_vdpau.h with                              VDPAU-specific hwcontext definitions.  63c3e35 / 7bc780c 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 

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