API changes, most recent first:
+2020-06-12 - b09fb030c1 - lavu 56.55.100 - pixdesc.h
+ Add AV_PIX_FMT_X2RGB10.
+
+2020-06-xx - xxxxxxxxxx - lavu 56.54.100 - frame.h
+ Add AV_FRAME_DATA_SEI_UNREGISTERED.
+
+2020-06-xx - xxxxxxxxxx - lavu 56.53.100 - log.h opt.h
+ Add av_opt_child_class_iterate() and AVClass.child_class_iterate().
+ Deprecate av_opt_child_class_next() and AVClass.child_class_next().
+
2020-06-05 - ec39c2276a - lavu 56.50.100 - buffer.h
Passing NULL as alloc argument to av_buffer_pool_init2() is now allowed.