I can’t see that log, the url appears to be truncated.
This is a weird one.
I assume your movie library in Jellyfin is targetted at the root? /media/Filme ?
I also assume you have your localisation set to french, have you tried temporarily setting it to us english and restarting the docker instance?
I’ve seen weird things happen if the docker instance starts before the mount, so if /data/Filme is a mount, it’s worth manually restarting your instance:
sudo docker restart jellyfin

Do you have nested libraries? Like a library pointed at /media and another one pointed at /media/Filme and maybe another at /media/Filme/Comedies ?
https://github.com/jellyfin/jellyfin/issues/8518

I’m pretty sure Firefox doesn’t know how to cast, that’s a chrome feature.
Secondly, a chromecast dongle can either be targetted locally by an app (such as chrome) or over the internet via https.
If you are just hosting on your windows laptop, you probably don’t have a domain with TLS, yes?
From localhost (the laptop itself), if you run chrome, you can probably cast to your dongle whilst on the same LAN.

If you have one of the newer Chromecasts with the remote, you can simply install the Jellyfin app on it directly, and address your Jellyfin install by IP and port.

Plex uses some fancy redirection work around these limitations, but it relies on an external service that they provide.

When you set up your libraries, it’s important that you point the path at the root folder, jellyfin expects a fairly specific naming convention.
Here’s how it is suggested to setup your tv shows for instance: https://jellyfin.org/docs/general/server/media/shows

Simplistically, lets say you have 2 shows called “Friends” and “The Witcher”, each with multiple seasons, and your NFS mount is /mnt/media.
You’d create something like: /mnt/media/tv
That’s where you’d point your tv library, at that “tv” directory. It doesn’t actually matter what the directory is called, but the library should be of type “shows”.
Under that /mnt/media/tv directory, you would create a directory for each show, and it would be the name of that show, so you’d get: /mnt/media/tv/Friends/ and /mnt/media/tv/The Witcher/
Then under those directories you would create seasons, to put your episodes in, ie /mnt/media/tv/The Witcher/Season 01/The Witcher - 01x01 - The End’s Beginning.avi
/mnt/media/tv/The Witcher/Season 01/The Witcher - 01x02 - Four Marks.avi

If you pointed the root of your library at /mnt/media/tv/The Witcher/Season 01/, it would probably fail to parse the episodes.
If you create your library as /mnt/media/allmystuff/ and just ram everything in there, it’s unlikely to find anything.
This may all seem a bit complicated, but there’s lots of tools that are useful to automate this process.
I personally recommend https://sonarr.tv/

If you are doing all of the above correctly, we’ll have to dig a bit deeper for more details.

As for “unsupported formats”, that most commonly happens when you have enabled hardware acceleration and it’s not working properly.
Whilst there’s several reasons why it may not be working, to rule it out, try temporarily disabling Hardware Acceleration under Dashboard -> Playback -> Transcoding.
The system should fall back to CPU transcoding which may be slow (hardware dependent), but at least it should function.

I’d sign up to Titter.

The US (which is where I assume you are), has the second largest one in the world in current operation:
https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Station

Short answer, it scales fine.
Now you need to find someone to pay for it.

The Back to the Future trilogy is good for a re-view.

I was on a customer site with a laptop and no internet access.
I tried to use my preferred diff tool meld to compare the current configuration file with the backed up copy and meld just wouldn’t start…
Turns out an update of windows had decided it was evil and removed it since I’d last used it, silently as far as I am aware.
This is straight up evil as far as I’m concerned.

I am now inspired to search for a way to disable that though.

Thoughts about Grace’s sacrifical acts:

Yes, but you would be seeing ALL posts from everywhere your instance knows about.

I kind of like the idea of being on lemmy.world, filtering to say aussie.zone and getting it to show me local.
Or being able to simply get a list of every community on another instance.

These are cool ideas.

In progress as I cooked.
The post image is the final product

The annoying thing to me is that it’s taken a further 13 years to reach a point where another social network is feasible.
I’m not saying there haven’t been attempts like diaspora and the early mastadon etc, but now we’re actually reaching a critical mass of participants where a move is worth it.

The same is true of Signal. I’ve been using it for nearly a decade, but it’s only in the last 2 years that people haven’t rolled their eyes when I mention it’s my preferred comms app.

The first 90% of the task takes 90% of the time.
The last 10% of the task takes the other 90% of the time.

I mean yes, but that’s not a federation problem.

To completely strawman AND slippery slope what you’re saying:

As a car safety pro, who primarily deals with car crashes:

STOP

TOWING

TRAILERS

Agreed, dangerous, I don’t want numpties doing it.
But it’s a large part of why I have a car.

I want to be clear, that I disagree with his “federation is stupid” point, but email has problems right now.

Theoretically it’s federated, theoretically you can spin up your own mail server and self host.

But even if you do that absolutely perfectly (SPF, DKIM, DMARC etc), you can falsely end up on spam list, that effectively block delivery of your email to large segments of the network for days if not weeks.

Whilst theoretically federated, email falls under the broad dominion of google, microsoft and a couple of other large players.

JavaScript (TypeScript) has access to cookies (and thus JWT). This should be handled by web browser, not JS. In case of log-in, in HTTPS POST request and in case of response of successful log-in, in HTTPS POST response. Then, in case of requesting web page, again, it should be handled in HTTPS GET request. This is lack of using least permissions as possible, JS should not have access to cookies.

JavaScript needs access to the cookies, they are the data storage for a given site.
To protect them, the browser silos them to the individual site that created them, that’s why developers haven’t been able to easily load cross domain content for years, to mitigate XSS attacks.
The security relies on the premise that the only valid source of script is the originating domain.
The flaw here was allowing clients to add arbitrary script that was displayed to others.
You’re dead right that only the way to fix this is to do away with JavaScript access to certain things, but it will require a complete refactor of how cookies work.
I haven’t done any web dev in a few years, this might even be a solved problem by now and we are just seeing an old school implementation. 🤷

I never owned a console, but I distinctly remember playing this, so there must have been a PC port some time in the early 90s.

Classic game.

The condescension in that makes it clear that the smug social network is whichever one the author happens to use.

Individual instance owners can do literally whatever they like.
Put up ads.
Charge a subscription.
Anything.

Let’s say instance A is hosting a community that everyone on instances B and C love to participate in.
But A want’s to earn some money so they start charging access to their local users.
This doesn’t effect users of B and C at all, because the data is federated.
The owner of A get’s grumpy and defederates B and C.
The users on B and C find somewhere else, either on one of their instances, or on D.

Everybody wins.

I’m not goin to shit on Briar, I hope they build out their dream.

It’s fundamentally not as easy to use.
My Grandma already has a phone with a full addressbook.
If she’s told to install Signal, it’ll just work as a drop in replacement for iMessage.

Briar meanwhile suggests sharing your contact info using another such as signal: https://briarproject.org/quick-start/#:~:text=When you choose “Add contact at a distance”%2C Briar,choose a nickname for them.

Briar is chasing different goals.

That single point of failure is to facilitate ease of use, with minimal reduction in security.
The messages are e2e encrypted and the server is designed in such a way that attempting to listen in would bring it down.
The signal org doesn’t even have your address book.

If your concern is “I don’t like signal”, you’re not going to make much traction.