since the last major version increase or the API was added.
The last version increases were:
-libavcodec: 2017-10-21
-libavdevice: 2017-10-21
-libavfilter: 2017-10-21
-libavformat: 2017-10-21
-libpostproc: 2017-10-21
-libswresample: 2017-10-21
-libswscale: 2017-10-21
-libavutil: 2017-10-21
+libavcodec: 2021-04-27
+libavdevice: 2021-04-27
+libavfilter: 2021-04-27
+libavformat: 2021-04-27
+libpostproc: 2021-04-27
+libswresample: 2021-04-27
+libswscale: 2021-04-27
+libavutil: 2021-04-27
API changes, most recent first: