I have a modest 2-bay Synology NAS connected to a Lenovo office PC from eBay that runs jellyfin. It works great. I don’t use the other services you mentioned.

A standalone NAS can do what you want. But it depends on your needs and how much you want to spend. How many concurrent clients? How many transcodes at once then? Transcoding 4K (this is very expensive)? All on NAS or NAS + PC?

My understanding is you can transcode using ram or ssd. And the size should be at larger than the size of the file. So 25GB file transcoded, you should have 25GB of ssd or ram available. This is per stream. So now you see how ram is expensive to transcode with, especially with multiple streams.

If transcoding a couple 1080 streams then a cheap office PC off eBay with Intel quicksync that is at least Skylake should work e.g. i5-6500T (this is what I have). You should be able to run those other services just fine. If direct streaming 4K there is not even overheard because no transcoding is happening so that should be fine too.

Most people with a nas use the nas as storage and a mini pc like intel nuc or dell optiplex mff or other as server with dockers. Think a lot started with a nas only but moved on. Like a lot of people start with a PI for docker and move to a mini pc.

So it will be possible but you will maybe migrate after some time to a different setup.

My setup is an optiplex mff as little nas and server with dockers like sonarr, radarr, qbittorrent, etc… running 24/7. Connected to my TV an optiplex mff with windows 10 to play jellyfin and other stuff.

Powerconsumption of an optiplex and nuc is also very low.

i use all of those (and quite a few more) as docker containers, but have built a somewhat powerful machine with leftover components after upgrading my main computer: currently 32 GB of RAM and i5-7000 (or something similar, can’t recall the exact model number).

since it’s running OMV for the NAS side of things, it uses about 4-6 GB of RAM constantly and about 10GB for swap. it does need to transcode some files from time to time, but I’ll just pause the stream for a minute or two and usually that’s enough buffering leeway to watch the rest without having to pause.

in terms of CPU usage, even on the most computationally heavy days it rarely uses more than 40% of the CPU

hope this info helps somehow

I use a Synology DVA 1622 NAS to host all of the things you did. The only difference is I upgraded the RAM to 16 GB (to handle my other services)

My wife and I can watch high quality series at the same time with no issues. Only limiting factor is our WiFi connectivity in the house is shit.