API changes, most recent first:
+2020-xx-xx - xxxxxxxxxx - lavc 58.88.100 - avcodec.h codec.h
+ Move AVCodec-related public API to new header codec.h.
+
+2020-05-23 - xxxxxxxxxx - lavu 56.49.100 - video_enc_params.h
+ Add AV_VIDEO_ENC_PARAMS_H264.
+
+2020-05-23 - xxxxxxxxxx - lavu 56.48.100 - hwcontext.h
+ Add av_hwdevice_ctx_create_derived_opts.
+
2020-05-23 - xxxxxxxxxx - lavu 56.47.100 - rational.h
Add av_gcd_q().
Move AVBitstreamFilter-related public API to new header bsf.h.
Move AVCodecParameters-related public API to new header codec_par.h.
-2020-05-xx - xxxxxxxxxx - lavc 56.86.101 - avcodec.h
+2020-05-xx - xxxxxxxxxx - lavc 58.86.101 - avcodec.h
Deprecated AV_CODEC_CAP_INTRA_ONLY and AV_CODEC_CAP_LOSSLESS.
2020-05-xx - xxxxxxxxxx - lavu 56.46.100 - common.h