Streaming Parameters Help

Hi,

i’m streaming from 1 system to another on local network
but streaming latency start from 1second latency then after sometime it goes to half second

and i think this make streaming time unreal
for example
if i play 30 seconds of clip on streaming start then it is 31 seconds of clip on receiving end.

ADD 1 STREAM tcp://111.111.20.201:5001 -vcodec libx264 -acodec aac -strict -2 -b:a 128K -ar 48000 -f mpegts -tune zerolatency -preset medium -b:v 2500k -maxrate 2500K -bufsize 5000K -vf scale=1024:576,setdar=4:3

Server: 2.0.7