API changes, most recent first:
+2017-03-18 - xxxxxxx - 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 - xxxxxxx - 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 - xxxxxxx - 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 - xxxxxxx - 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 - xxxxxxx - lavc 57.80.100 - avcodec.h
+ Add AVCodecContext.hw_device_ctx.
+
+2017-02-11 - xxxxxxx - lavu 55.47.100 - frame.h
+ Add AVFrame.opaque_ref.
+
+2017-01-31 - xxxxxxx - lavu 55.46.100 / 55.20.0 - cpu.h
+ Add AV_CPU_FLAG_SSSE3SLOW.
+
2017-01-24 - xxxxxxx - lavu 55.45.100 - channel_layout.h
Add av_get_extended_channel_layout()