SRT server settings need to reduce lag
So I got a Windows server OS VDS and set up OBS there. I tested it with 2 SRT clients and see latency from 3to4 seconds from them.
So I have some questions regarding this issue
1 do i need ffmpeg custom install or obs has it up to date and fully set up?
2 can i reduce that 4sec lag from client with some srt line arguments? on srvers side
3 how to optimize lag while having 2 or more clients?
server and client are in one country phisicly server and client both have 1gb internet. CPU on server works fine and handle stable 60fps but on twitch channel i see buffers a lot and huge lag from server to twitch. clients sent srt on 6000 bitrate server use the same settings
Flaeri•19d ago
What is your RTT? What are you currently specifying?
1. You can use OBS' SRT implentation, yes.
2. Probably, depends on RTT
3. Could you rephrase the question? What is "lag" in this instance? You can specify latency per sender
To be perfectly honest, my best result in OBS was by specifying nothing. Got about 300ms glass to glass. That was OBS -> OvenMedia
If you are using the media source in OBS to "ingest" SRT, then you can try messing with
probesize and rtbufsize, as the default buffer is quite large (in order to handle reliable streams)Purr•18d ago
how to measure RTT? i tried google it but no way I will be able to understand all that words... may be there is a cmd command for windows or some software?
Flaeri•18d ago
I think its good enough to shortcut it with a simple ping. Dosent need to be super accurate.
you'll find the RTT term all over SRT, so if you want to take the simple way out, just pretend it say ping
Purr•18d ago
so ping server_ip will be enough? then I can set up param latency for each client?
Flaeri•18d ago
I need more information about what you're doing. How you're measuring the latency, how / what is sending SRT, and to where, and who is consuming (viewing).
HunterAP•18d ago
Might also want to try a tracert to see where the latency is coming from
If it's external there isn't much you'll be able to do
Flaeri•18d ago
I would bet money that the latency is coming from the reading side (ingest/decode), buffering input. Its extremely common to have a sizable buffer to handle variance, re-ordering, udp etc. If you have a fairly trustworthy connection and protocol, this can be slimmed down substantially with limited downside (unless the path craps out of course)
mikeful•16d ago
do you have SRT latency parameter set on either side? connection negotiation will use bigger one of those. if nothing is specified, SRT default of 125ms is used
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