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Plex, Emby, or Jellyfin
(discuss.tchncs.de)
CordCutters is a place for those who have cut the Cable or Satellite TV cord, and want to know what other legal services are available. No piracy talk please, it could get the person posting it in trouble with the authorities and could get the community banned on some servers, so please only talk about products and services that are legal to use.
I've used Plex for 10 years+ and Jellyfin for few months. Plex handles media recognition great and has an easy match function for the videos that aren't automatically recognized or need to be fixed. I have a few friends/family that I share my library with and it's easy for them to get connected remotely using their phones and roku/firestick without any issues using their plex accounts. I have the lifetime pass so my mobile devices connect for free but it there may be cost to install the mobile app.
Plex has expanded their free/ad-supported movies/tv shows but I have enough content I haven't explored it much. My server isn't very powerful so I can only have 2 streams going at once for my library which is mostly x265 content with a bunch of x264 content as well but that's enough for my needs.
I use a roku as my main client and besides some flakiness with the wifi from time to time it works fine, responsive and you can use the mobile app or http://remoku.tv/ as remote controls too in addition to the physical remote.