Movies disappear from library view after metadata refresh

[Prko]

Hi, 
I'm having a strange problem with Jellyfin 10.11.11 and I'm hoping someone can help me figure out what is happening. 
I have a large movie collection on a QNAP NAS. One of my Jellyfin movie libraries is called "4K - UHD" and uses the path: /media/Movies/4K 
The library currently contains around 900 4K movies. 


The problem: 

When I refresh/change the metadata of certain movies, the movie disappears from the normal "4K - UHD" library view.
However, the movie has NOT actually been removed from Jellyfin.
For example, this happened with The Revenant (2015). 
After refreshing its metadata: 
The Revenant no longer appears in the normal 4K - UHD movie list. Global Jellyfin search still finds the movie. 
I can open the movie normally from the search result. The poster, title, description and other metadata are present. 
Jellyfin correctly detects the file as 4K HEVC HDR. 
Media Info shows that the file is still located under: /media/Movies/4K/The.Revenant.../...mkv 
The actual MKV file is still present on the NAS. No filters are enabled in the 4K library.
Sorting has been checked and changing the sorting does not make the movie appear. A complete library scan does not bring the movie back into the 4K library view. 

Restarting Jellyfin also does not solve the problem. The Jellyfin log also shows that The Revenant was identified and assigned the correct TMDb provider ID: Tmdb: 281957
So Jellyfin clearly knows about the movie and can access it, but for some reason it is no longer displayed in the normal library view after the metadata refresh. 
I tested metadata refreshes with a few other movies and the same thing happened, so I stopped refreshing any more movies. 

I have also seen errors in the Jellyfin log, including NullReferenceException, ObjectDisposedException, and Screen Grabber / ffmpeg image extraction timeouts, although I don't know whether these are related. 

Server: Jellyfin 10.11.11 
Storage: QNAP NAS 
Library type: Movies 
Library path: /media/Movies/4K 


Has anyone seen this behavior with Jellyfin 10.11.x? 

Is there a known database/library-view issue where an item remains searchable and playable but disappears from its library view after refreshing metadata? 

I would prefer not to rebuild the library or database unless necessary because the collection is very large. 



Thanks for any help!

[TheDreadPirate]

Can you share your jellyfin log via pastebin?

[Prko]

Thanks for your help.
I uploaded the Jellyfin log from August 9th to Pastebin as requestet:

https://pastebin.com/bxcjc11i

The issue is still the same: some movies don't appear in the movie library, but I can find them using the search function.

Please let me now if you need any additional logs or information.


Greetings from Austria.

[TheDreadPirate]

Your folder and file names are awful. Not related, I don't think, but something to consider. There are apps that can automate renaming your media to conform to Jellyfin's documented expectations.

I also see a lot of timeouts for various functions and I'm wondering if that is the cause. I am assuming that Jellyfin does not run on the QNAP NAS? If so, what are the specs of your server?

[Prko]

Jellyfin actually runs directly on my QNAP NAS in Docker.
My server specs are:
QNAP TS-853A
Intel Celeron N3160, 4 cores / 4 threads, up to 1.6 GHz
4 GB RAM
QTS 5.2.5.3145 Build 20250526
8 × 12 TB Seagate IronWolf in RAID 5
Jellyfin 10.11.11 running in Docker
The media files are stored on the same NAS.
I also noticed the timeouts in the log. Could the relatively old CPU or the 4 GB of RAM be causing the library/metadata refresh issue?
The strange thing is that the affected movies are still indexed and can be found and played through Jellyfin's search, but they disappear from the normal movie library view after refreshing their metadata.
Thanks again for your help!

[TheDreadPirate]

Does the container have direct access to the media? Regardless, it sounds like things are just taking so long or become unresponsive enough that Jellyfin thinks the media isn't there anymore. IDK. Definitely a weird problem. Do you have another device you could run Jellyfin on and access the media over the network? For testing purposes.

[Prko]

One additional detail that might be important:

The movies are displayed normally in the library at first. The problem only occurs after I manually refresh their metadata (movie information, posters/artwork, etc.).

After the metadata refresh, the affected movie disappears from the normal movie library view. However, it can still be found through Jellyfin's search and can still be played normally.

I tested this with several movies and the same thing happened each time.

Could this be related to the timeouts you noticed in the log?


And Yes. I checked the Docker container configuration in QNAP Container Station.

The media share is mounted directly into the Jellyfin container:

/DATEN -> /media (read/write)

The other mounts are:

/Container/jellyfin/config -> /config (read/write)
/Container/jellyfin/cache -> /cache (read/write)

So the container does have direct access to the media.


Thank you so much for your time and your help...

[TheDreadPirate]

Can you go to the follow places and change a few settings? We are going to try to restrict how many threads jellyfin can use at a time. I think the CPU in your NAS is pretty under powered and the default of "use all the cores all the time" isn't working out.

Dashboard > General
- Set Parallel library scan task limit to 1
- Set Parallel image encoding limit to 1
- Save
Dashboard > Playback > Trickplay
- Set FFmpeg threads to 1

Then try to do a full library scan again. Once that completes, share a fresh server log via pastebin.

[Prko]

Small update:

I figured out part of the issue.
The movies beginning with “The” were not actually missing. After the metadata refresh, Jellyfin apparently sorts them without the leading article.

For example, “The Accountant” appears under A and “The Revenant” under R.
Sorry for the confusion — I completely overlooked this at first. 😅


However, Predator (1987) is a separate case. The movie file is still present on the NAS, but Jellyfin currently does not show it in the library or search. I have started another library scan and will check the result.


I will still try the settings you suggested tomorrow, run a full library scan afterwards, and provide a fresh server log. I think it is still worth testing, especially because of the timeouts and the Predator issue.



Best regards