One of those projects that has me wondering what I was doing instead of building this. The end result is great, and the technical details seem like they'd be interesting. TIL about Internet Protocol TV: https://github.com/iptv-org/iptv
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What you see in the repo is a lot of different HLS manifest[1], which in turn pointed to different questionable sources of all the OTT streams around the world.
[0]: https://en.wikipedia.org/wiki/Open_IPTV_Forum [1]: https://en.wikipedia.org/wiki/HTTP_Live_Streaming
Lots of the US and CA ones look to be the same sort of situation. You'll find most wont work without a VPN as they are geo blocked.
Nowadays theres better tools for the job. StreamMaster* for example can handle thousands of IPTV sources and let you organise them nicely into something that can be read by Plex, Jellyfin, etc.
*Sadly recently abandoned but still available on github.