I play tcp stream from camera，there is about 0.5 seconds delay，is there some buffer resulted in?

[jacek-marchwicki]

I'm not an ffmpeg expert but at least 0.5s delay is reasonable for streaming to be sure that video will not be broken when network will delay.

You can look here: https://trac.ffmpeg.org/wiki/StreamingGuide#Latency for more informations