Ask HN: What's your ubiquitous media solution?

There's been a fair bit of HN chat about media servers recently. This coincides with my decision to cobble together a "ubiquitous" media solution for personal use. It making me define exactly what I'm hoping to achieve. My personal criteria are that such a system must:

- Play almost any music including personal collection and streaming

- Play it almost anywhere: at home, on mobile, in the car, at a friend's, maybe abroad.

- Be accessible by any OS and nearly any device (web, iOs, Android... less bothered about desktop fat clients or terminal). In fact, an iOs client might be a necessity since friends won't use it unless it's straightforward via iPhone, and I'd like it to be a sociable setup.

- Ideally allow sharing or access by trusted others -- a nice-to-have.

- Another nice-to-have: plugins or hackability.

My primary concern is music, but I'd extend this to podcasts, radio (recorded on PVR currently), and video (again PVR probably).

Currently I'm thinking of Mopidy [1] or Tomahawk [2] plus home-based NAS. Curious about whether NASes can be synchronised to cloud services, since streaming everything from a home-based server might not always be desirable. Equally, a cloud-based Plex [3] doesn't feel perfect since I'd like to retain physical control over the storage and software.

How have you solved this problem or similar? What were the gotchas? UK-based if that influences things.

[1] https://www.mopidy.com/

[2] https://www.tomahawk-player.org/

[3] https://www.plex.tv/