API changes, most recent first:
+2016-xx-xx - xxxxxxx / db7968b - lavf 57.40.100 / 57.7.0 - avio.h
+ Add AVIODataMarkerType, write_data_type, ignore_boundary_point and
+ avio_write_marker.
+
+2016-xx-xx - xxxxxxx / 0c4468d - lavu 55.26.100 / 55.12.0 - opt.h
+ Add av_stereo3d_type_name() and av_stereo3d_from_name().
+
+2016-06-22 - xxxxxxx - lavu 55.25.100 - hwcontext_dxva2.h
+ Add new installed header with DXVA2-specific hwcontext definitions.
+
2016-04-27 - fb91871 - lavu 55.23.100 - log.h
Add a new function av_log_format_line2() which returns number of bytes
written to the target buffer.
* base -- is now stored in AVBufferRef
* reference, type, buffer_hints -- are unnecessary in the new API
* hwaccel_picture_private, owner, thread_opaque -- should not
- have been acessed from outside of lavc
+ have been accessed from outside of lavc
* qscale_table, qstride, qscale_type, mbskip_table, motion_val,
mb_type, dct_coeff, ref_index -- mpegvideo-specific tables,
which are not exported anymore.