setup iptv - sub3/NextPVR GitHub Wiki
Click on IPTV Device in the Devices list ...
Enter a value in Max-Connections if your IPTV Provider restricts the number of simultaneous streams or channels that you can receive.
Click Import Channels ...
Enter the URL (the web address) of a M3U file.
You can also enter the URL for a XMLTV file that contains EPG data. The URL might end with, for example, .gz if the file is compressed.
Click Import to pull channels into NextPVR Server. Click Save to save the list of channels.
You can add or edit the EPG Source for IPTV channels ... EPG