SS IPTV

Hey guys,
Is it possible to use local streams in SS-IPTV?
I recently purchased a Fritz! WLAN Repeater DVB-C. It has 2 DVB-C tuners. On the PC, i can play the TV channels by exporting a playlist and opening it with VLC.
I tried to use that playlist in SS-IPTV, but it cannot play anything. Even tried to forward the TCP port in my router and use the external IP, still no luck.
Any ideas?
Thank you!

99% of provider' streams in our app are local
I don't know what is the problem in your case, pobably your streams are configured incorreclty

When i say local, i mean my own private LAN, the streams looks like this:

rtsp://192.168.2.55:554/?freq=306&bw=8& ... ,1511,1502

I understand. Don't use rtsp protocol and try different audio/video codecs
also, comma is not allowed symbol in url as I know

Unfortunatelly, i am limited to rtsp.
This is the only option i have. Any suggestion?
Thank you!

I haven't

Any logs i can look for?
For a short amount of time i was able to see one channel. As soon as i tried to move on to the next one, it stopped working.
Do you know what TCP ports is your app using?
Thanks!