I've run it on a pi 4 with no issues(streaming 1080p). If you're not casting to another device you might want to check out Kodi though.
+1 for Kodi in this situation.
Probably depends on the raspberry pi but jellyfin tends to be pretty heavy duty on its hardware requirements. You can probably get by on a modern raspi with transcoding off
I ran it on a Ras Pi 3B+ and it did ok with 1080p and below. There were a few movies that had stuttering issues, so I'm guessing the Pi's better with some codecs than others.
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