API changes, most recent first:
+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()