Tvheadend

Confused. I read three times the description and I really don't know what you're asking about. It's better to show all subscription / unsubscription requests.

I'm sorry, i just tried not to forget anything, maybe thats bit confusing.
I will try again:
Starting sat>ip stream, then starting second stream (other channel,other mux), both streams play normally, both tuners work.
Then stopping one stream (first log snippet), other stays tuned, but after short time stream freezes for 2-5 seconds, after that plays normally again.
I copied these lines from log only to show what i mean, if you see the short freeze comes from unsubscribíng sat>ip stream, then subscribe again. That happens without touching the frontend, the only thing i did was stopping the second stream. I think stopping one stream shouldn't break the other.
Hope its not too confusing, but i think it should be clear ;)

OK. Provide the logs '--trace satip,mpegts,service' . https://tvheadend.org/projects/tvheadend/wiki/Traces

And try to show in logs (time range) where the second streaming is blocked.

Look around last lines in syslog, around 16:49:05, same in trace log. Maybe you will se whats happened.

If I understand the logs correctly, the SAT>IP server tuner number 2 does not send any MPEG-TS packets for the VLC subscription (there is just no input). Add also 'httpc' to the trace logs and provide logs from the SAT>IP server (--trace satips).

Will do tomorrow, but VLC subscription is ok, i can watch the channel normally. But problem begins after i close vlc, i close it and after that stream on other frontend stops (dvbviewer here). Same when epgscan is active and goes up to next mux, freezes for some seconds (in dvbviewer) then play again normally.

Just to give some more information:
Now i got 2 backends running, one with 2 tuners and tvheadend as sat>ip server, second with minisatip as server, different devices (raspberry pi 1+2) and so different IP's. If using different tuners on different devices unsubscribing channels (or epg scan) never stops the other stream for some seconds, so maybe the problem is on the sat>ip server side...

Pls, upgrade to v4.1-1315-g18c0ca1 (TVH SAT>IP server only) and provide logs only for TVH SAT>IP server..

And i checked again, if i do the same with third tuner on different machine (i set priority higer so that its used for the second stream)i didn't have that problem. Maybe tvh has problems with 2 identic tuners in the same device? Both are named "Silicon Labs Si2168 : DVB-C #0" but physically they are /dev/dvb/adapter0 and /dev/dvb/adapter1.....

...no, that wasn't it, i renamed the adapters ;-)

2016-01-05 16:19:28.176 subscription: 0002: "SAT>IP" unsubscribing, hostname="192.168.0.15" 

2016-01-05 16:19:34.142 subscription: 0001: "SAT>IP" unsubscribing, hostname="192.168.0.15" 

Many thanks!