since the last major version increase.
The last version increases were:
-libavcodec: 2015-08-28
-libavdevice: 2015-08-28
-libavfilter: 2015-08-28
-libavformat: 2015-08-28
-libavresample: 2015-08-28
-libswscale: 2015-08-28
-libavutil: 2015-08-28
+libavcodec: 2017-03-23
+libavdevice: 2017-03-23
+libavfilter: 2017-03-23
+libavformat: 2017-03-23
+libavresample: 2017-03-23
+libswscale: 2017-03-23
+libavutil: 2017-03-23
API changes, most recent first:
+2018-xx-xx - xxxxxxx - lavc 58.10.0 - avcodec.h
+ Add av_bsf_flush().
+
+2018-02-xx - xxxxxxx - lavfi 7.1.0 - avfilter.h
+ Add AVFilterContext.extra_hw_frames.
+
+2018-02-xx - xxxxxxx - lavc 58.9.0 - avcodec.h
+ Add AVCodecContext.extra_hw_frames.
+
+2017-xx-xx - xxxxxxx - lavc 58.8.0 - avcodec.h
+ Add const to AVCodecContext.hwaccel.
+
+2017-xx-xx - xxxxxxx - lavc 58.7.0 - avcodec.h
+ Deprecate user visibility of the AVHWAccel structure and the functions
+ av_register_hwaccel() and av_hwaccel_next().
+
+2017-xx-xx - xxxxxxx - lavc 58.6.0 - avcodec.h
+ Add AVCodecHWConfig and avcodec_get_hw_config().
+
+2017-xx-xx - xxxxxxx - lavu 56.7.0 - stereo3d.h
+ Add view field to AVStereo3D structure and AVStereo3DView enum.
+
+2017-xx-xx - xxxxxxx - lavc 58.5.0 - avcodec.h
+ Add avcodec_get_hw_frames_parameters().
+
+2017-xx-xx - xxxxxxx - lavu 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().
+
+2016-xx-xx - xxxxxxx - lavf 58.1.0 - avio.h
+ Add avio_read_partial().
+
+2017-xx-xx - xxxxxxx - lavu 56.4.0 - imgutils.h
+ Add av_image_fill_black().
+
+2017-xx-xx - xxxxxxx - lavu 56.3.0 - frame.h
+ Add av_frame_apply_cropping().
+
+2017-xx-xx - xxxxxxx - lavc 58.4.0 - 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 56.2.0 - hwcontext.h
+ Add AV_HWDEVICE_TYPE_D3D11VA and AV_PIX_FMT_D3D11.
+
+2017-04-30 - xxxxxxx - lavu 56.1.1 - hwcontext.h
+ av_hwframe_ctx_create_derived() now takes some AV_HWFRAME_MAP_* combination
+ as its flags argument (which was previously unused).
+
+2017-04-xx - xxxxxxx - lavu 56.1.0 - spherical.h
+ Add av_spherical_projection_name() and av_spherical_from_name().
+
+2017-04-26 - xxxxxxx - lavc 58.3.1 - avcodec.h
+ Add AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH.
+
+2017-03-xx - xxxxxxx - lavc 57.37.0 - avcodec.h
+ Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at
+ a later point.
+
+2017-03-xx - xxxxxxx - lavu 55.35.0 - hwcontext.h
+ Add AV_HWDEVICE_TYPE_NONE, av_hwdevice_find_type_by_name(),
+ av_hwdevice_get_type_name() and av_hwdevice_iterate_types().
+
2017-03-xx - xxxxxxx - lavu 55.34.0 - hwcontext.h
Add av_hwdevice_ctx_create_derived().