Second version of callbacks:
Second version of callbacks:

- more debug output
- moved code from send module

UweM/nginx-rtmp-module,UweM/nginx-rtmp-module,UweM/nginx-rtmp-module,sergey-dryabzhinsky/nginx-rtmp-module,sergey-dryabzhinsky/nginx-rtmp-module,sergey-dryabzhinsky/nginx-rtmp-module