API changes, most recent first:
+2017-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxx - 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-xx - xxxxxxx - lavu 56.7.100 - cpu.h
+ AVX-512 flags added.
+
+2017-xx-xx - xxxxxxx - lavc 58.8.100 - avcodec.h
+ The MediaCodec decoders now support AVCodecContext.hw_device_ctx.
+
+2017-xx-xx - xxxxxxx - 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-xx-xx - xxxxxxc - 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-xx-xx - xxxxxxx - lavu 56.4.100 / 56.7.0 - stereo3d.h
+ Add view field to AVStereo3D structure and AVStereo3DView enum.
+
2017-xx-xx - xxxxxxx - lavc 58.6.100 - avcodec.h
Add const to AVCodecContext.hwaccel.