Android TV max streaming bit rate

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Again bringing up the topic regarding transfer speed:

On Android TV the maximum setting is currently 200 Mbit/s - some of my 4K videos have around 20 Mb/s which would be 1600 Mbit/s.

Still unsure if Jellyfin will then convert the video down to match the 200 Mbit limit or not.

20Mb/s = 20Mbit/sec
If you meant 20MB/s then this is only 160Mbit/s (not 1600, as its 8bits to a byte)
If these are 4K UHD Bluray movies the max bitrate is 144Mbit for newer discs and 128Mbit for the normal sized discs, so even if you have a remux there is no way it gets past 200Mbit/sec.
If these are 4K movies you have made yourself, then i would probably suggest re-encoding them to a more normal bitrate.

Yeah sorry - seems I am no longer able to do simple mathematics. 
1 Byte = 8 Bits -> 1 Megabyte = 8 Megabit and so on.