This field is tip for server. You can use “auto” value: in this case SRTMiniServer read info about FPS from incoming data.
"auto" value works good but sometimes FPS info is wrong and "audio cracking" issue happens (read here). In this case you can explicit setup this field if you known this info.
All frames go to special buffer and if buffer before output. You can setup start and max value for this buffer. When buffer will full then SRTMiniServer DROPS alls frames.
You can type 0 for max value for turn off drops.
Recommended range: 100 and 400 ms for real-time cases