Unfortunately is seems that Roman Arutyunyan has not been able (or willing) to keep up the development of nginx-rtmp-module. Thankfully, Mr. Sergey Dryabzhinsky has a fork [0] that has added a lot of nice new features (EXT-X-PROGRAM-DATE-TIME!) and some bug fixes.

[0] https://github.com/sergey-dryabzhinsky/nginx-rtmp-module