Would like to run my own IPTV playlist through my Nvidia shield being used as a media server. Unfortunately all the IPTV plugins require access to a PC which I don't have. Is there another way around the need for a PC? I'm usingy shield as the server. I have the IPTV plugin installed and can see it, but imputing my credentials just saves and doesn't seem to populate any channels or anything. Can somebody help me.
You can't do it without a PC. Plex does not directly support m3u lists. All current methods use a third party app to emulate a TV tuner called hdhomerun which Plex does support. The most popular hdhomerun simulator is called xTeVe and it needs to run on a computer since there is no Android version.
xTeVe has a webui that allows you to load m3u lists along with epg lists, it also allows you to filter and group channels as you like. It will then advertise itself on your LAN as a hdhomerun device. Plex will "see" xTeVe as a hdhomrun TV tuner and add it to the Live TV & DRV.