disable auto bookmark, chapter or segment

[mimdal]

I have an issue that I haven’t been able to resolve through searching—perhaps I’m not using the right keywords. When a video file has no bookmarks (or chapters or segments—I’m not sure what Jellyfin calls them), and the video starts, Jellyfin displays a message: "Fetching additional data." After a while, it loads bookmarks for every second, causing Jellyfin clients to slow down and stop functioning properly. I thought the plugin "Chapter Segments Provider" was the cause of the problem, so I uninstalled it, and I disabled Metadata downloaders (Episodes) option in admin panel, However this behavior persists. I attached a picture for two video files, one has the problem and another is OK.

[Efficient_Good_5784]

Dashboard > Libraries > Metadata > "Chapter Image Intervals"

Go to the page above and fix your dummy chapter interval. Your issue is that Jellyfin can generate dummy chapters for files that don't have embedded chapter files, but your interval is insanely short. This leads to a whole bunch of chapters that will slow down your client, probably to the point of not being usable.

The interval is in seconds I believe. A common mistake is to think it's in minutes. A value of 0 disables dummy chapters.

You can delete existing chapter metadata by going to Jellyfin's config folder.

Config > metadata > library

Just search for and delete the existing chapter images and Jellyfin should redo them with your new interval.

[mimdal]

the following scenarios doesn't work
1- set interval to zero, then delete all subdirectories of /var/lib/jellyfin/metadata/library, restart Jellyfin and play a movie
2- set interval to 600, then delete all subdirectories, restart and play a movie

Jellyfin v. is 10.10.5

[mimdal]

finally, it's work as expected. As Efficient_Good_5784 said I set intervals, the default value was 1: Dashboard > Libraries > Metadata > "Chapter Image Intervals"
then refresh metadata per item (e.g. movie): select refresh mode 'replace all metadata'