A new plugin is in the Emby plugin catalog for Emby Premiere users, largely developed by @softworkz. This plugin requires Emby Server version 4.9.1.27+, so unless you're running that, you will not see it.
WebStreams
This is designed to be a better version of the IPTV plugin. You can now import both single streams as well as M3U lists into Emby Server. Eventually we may also add RSS support and merge the podcasts plugin into this. Beyond RSS, there is also the potential to support other formats if there's enough demand for them.
Features
Import both single streams and M3U lists into Emby Server
TV episodes within M3U are displayed with Series and Season hierarchies, just like regular libraries (make sure to select the appropriate content type when adding a source)
Rich metadata support using MovieDb and TVDB (make sure to select the appropriate content type when adding a source)
Ability to filter what gets imported
Known Issues
We need to add more visibility into the server's background refresh queue. You can see the progress of it on the webstreams config page. Currently if you restart the server in the middle of this, then you will need to run the refresh channels scheduled task.