API changes, most recent first:
+2017-03-21 - xxxxxxx - 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 - xxxxxxx - 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 - xxxxxxx - lavfi 6.77.100 - avfilter.h
Deprecate AVFilterGraph.resample_lavr_opts
It's never been used by avfilter nor passed to anything.