API changes, most recent first:
+2018-09-09 - xxxxxxxxxx - lavc 58.29.100 - avcodec.h
+ Add AV_PKT_DATA_AFD
+
+2018-08-16 - xxxxxxxxxx - lavc 58.23.100 - avcodec.h
+ Add av_bsf_flush().
+
+2018-05-xx - xxxxxxxxxx - lavf 58.15.100 - avformat.h
+ Add pmt_version field to AVProgram
+
+2018-05-xx - xxxxxxxxxx - lavf 58.14.100 - avformat.h
+ Add AV_DISPOSITION_STILL_IMAGE
+
+2018-05-xx - xxxxxxxxxx - lavu 56.18.101 - hwcontext_cuda.h
+ Add AVCUDADeviceContext.stream.
+
+2018-04-xx - xxxxxxxxxx - lavu 56.18.100 - pixdesc.h
+ Add AV_PIX_FMT_FLAG_ALPHA to AV_PIX_FMT_PAL8.
+
+2018-04-xx - xxxxxxxxxx - lavu 56.17.100 - opt.h
+ Add AV_OPT_FLAG_DEPRECATED.
+
2018-04-xx - xxxxxxxxxx - lavu 56.16.100 - threadmessage.h
Add av_thread_message_queue_nb_elems().