Yep, the api in jellyfin is quite easy. Someone already sent the link to the docs. The specific endpoint you want is Sessions. You need to get yourself an api_key which you can get in the admin panel. Here is an example code in Python to give you an idea on how to use the api:
#!/usr/bin/env python3
import requests
response = requests.get("http://your_jellyfin_server:8096/Sessions?api_key=your_api_key")
json = response.json()
currently_watching = []
for session in json:
if "NowPlayingItem" in session:
currently_watching.append(session["UserName"])
if currently_watching:
print("Currently watching: " + ", ".join(currently_watching))
else:
print("Nobody is watching")
If it is indeed Python that you want to use, you can adjust it to your needs depending on what you want it to output.
Basically, it is as simple as looping through every current session and checking if they have a NowPlayingItem key which is only present when they have a video open (both playing and paused). It works very reliability, I am using it to automatically change my lights when I watch a long video or movie.
Dude, I have YouTube music and I literally am not able to change or upgrade to YouTube premium. They don't let me, it links me to a useless empty page with no options. I don't even know what the price is like. This whole subscription thing is a mess.
I solved it by using YouTube revanced and have all premium functions and more. On desktop I wrote my own player. It's so much better because their website is a mess. At this point do I really want to pay for features I know I won't use?