Which is newer?
ffmpeg-N-100679-g24dc6d386c
is newer. It is from the git master branch, and is a snapshot of the current, up-to-date FFmpeg code for the date it was released. It corresponds to commit 24dc6d386c
(note I omitted the g
prefix) which is from 2021-01-20.
4.3.1
is from 2020-07-11. Since new features are not backported to release versions (only certain bug fixes) it is just an extension of 4.3 which was released on 2020-06-08. The FFmpeg Download page contains the dates for releases.
So ffmpeg-N-100679-g24dc6d386c
is about 7 months newer than 4.3.1.
Which do I use?
ffmpeg-N-*
for general users. If you want the latest code and features. Required for anyone who wants to submit a bug report. If you experience a problem with the newest release. It is stable ~98% of the time I'd guess from using it over many years.
Release version: if you are required to stay within a certain API version. For distros, distributors, users of the FFmpeg libraries, etc.