Thumbnail image extraction always running for hours

[JoLas 26]

Version 4.8.1.0

I have my scheduled task setup to perform  Thumbnail image extraction on server startup because I have a script that once a week shuts down Emby and performs a number of tasks, reboot windows if there's pending updates and so on.

I also have my libraries set to scan for thumbnails as a scheduled task and when media is added.

Now since a couple of versions back every time embyserver starts it extacts thumbnails for hours, even shows that have been there for years.

Is this to be expected? A couple of months back the thumbnail creation went by super quick since everything should be already created.

Here's an extract of the log file:
 

2024-02-18 11:53:35.878 Info QuickSingleImageExtractor: ProcessRun 'quick-extract-image' Execute: C:\EMBYSERVER\system\ffmpeg.exe -skip_list 548 -f matroska -threads 1 -copyts -i file:"\\NAS\FILM\Serier\Star Trek Picard (2020)\Season 2\Star.Trek.Picard.S02E04.Watcher.1080p.AMZN.WEB-DL.DDP5.1.H.264-NTb.mkv" -an -sn -update 1 -vf "scale=trunc(min(max(iw\,ih*dar)\,600)/2)*2:trunc(ow/dar/2)*2,thumbnail=24" -vsync 0 -f image2 "C:\_EmbyTemp\cache\temp\74d634d6-fad7-4d54-8c5a-de3ed9ffb843.jpg"

2024-02-18 11:53:36.536 Info QuickSingleImageExtractor: ProcessRun 'quick-extract-image' Process exited with code 0 - Succeeded

2024-02-18 11:53:36.539 Info QuickSingleImageExtractor: ProcessRun 'quick-extract-image' Execute: C:\EMBYSERVER\system\ffmpeg.exe -skip_list 599 -f matroska -threads 1 -copyts -i file:"\\NAS\FILM\Serier\Star Trek Picard (2020)\Season 2\Star.Trek.Picard.S02E04.Watcher.1080p.AMZN.WEB-DL.DDP5.1.H.264-NTb.mkv" -an -sn -update 1 -vf "scale=trunc(min(max(iw\,ih*dar)\,600)/2)*2:trunc(ow/dar/2)*2,thumbnail=24" -vsync 0 -f image2 "C:\_EmbyTemp\cache\temp\b9586c3f-e738-4484-b6db-71e19d313e09.jpg"

2024-02-18 11:53:36.958 Info QuickSingleImageExtractor: ProcessRun 'quick-extract-image' Process exited with code 0 - Succeeded

[Luke 42080]

Hi, please attach the complete log file.

 But it’s normal that the scheduled task will go back and try to create them for everything, even older content.

[JoLas 26]

Okay, I restarted the server a couple of times yesterday and the thumbnail extraction finished within a second so I guess it's a hit and miss when it does run a full scan.

I know for sure that when it performs the weekly restart it runs the exraction.

If you say it's normal I'm good with that, it only takes a few hours and really doesn't impact the performance that much.  

[Luke 42080]

It's not expected to re-extract for videos that already have thumbnails, just to clear that up.