Plex server can do that on the fly if you choose to “download” a movie to bring it offline on your phone. For me, I want all the original bits on the server and let it encode on the fly per device if required.

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But you could store 10-20x the movies if you pre-transcode them. As long as I can’t tell the difference (which takes some trial and error sometimes) I’d rather fit more movies onto the server.