Remember to check if you need to bump versions for the specific libav
parts (libavutil, libavcodec, libavformat) you are changing. You need
to change the version integer and the version string.
Incrementing the first component means no backward compatibility to
previous versions (e.g. removal of a function).
Incrementing the second component means backward compatible change
(e.g. addition of a function).
Incrementing the third component means a noteworthy binary compatible
change (e.g. encoder bug fix that matters for the decoder).