I am unsure what you mean by ‘minimum bitrate’.
Should the server refuse to deliver video to the client if the client has set a maximum of e.g. 1mbps?
What about transient bandwidth slumps in the network connection between server and client? Those can and will occur - more often than you think.
“Force original video quality” would be basically a policy to not transcode the video. Which can and will not work with many clients. There are so many quirks in some player stacks that can only be worked around by either
- writing an own player (which is what Xplay, Kodi etc do, but which is out of the question for Plex)
- transcoding to a set of parameters which are known to be working
So, to Plex only the second option is available.
