I have hundreds of movies, TV shows and music that I have bought over the years. They all reside on my Plex Media Server. Just like books, I tend to buy these works and watch them once in awhile, instead of relying on "streaming" services like Netflix where content isn’t always available forever.
If you already have Plex Media Server running, then you can build an inexpensive Plex Media Player using Raspberry Pi 3 and RasPlex. Plex Media Server is based on open source Kodi (formerly XBMC), but is not fully open source. Plex Media Center has a friendly interface and it’s very easy to set up a media center (See our previous tutorial on how to install it on a Raspberry Pi 3 or on another dedicated Linux machine).