How to force chapter thumbnails regeneration

Plex Media Server
1

Hi all,
recently I’ve accidentally deleted my Media Cache folder (containing the thumbnails preview) during a server migration.

While thumbnails are correctly generated for the newly introduced media, I’m not able to force Plex to regenerate them for the historical ones.

I’ve tried:

  • Analysing the media from Plex Web
  • Disable/Enable media thumbnails generation
  • Force media generation via command line, ex.

“Plex Media Scanner.exe” --item 60116 --generate --chapter-thumbs-only --force

Unfortunately even the last command immediately exits with “Generated new chapter thumbnails for…” since it probably already finds them on the internal database.

May I ask some Plex Guru on how to force the thumbnail regeneration?

Thank you

2

Disable them in the properties of your video libraries.
Then click on ‘Delete Preview Thumbnails’
Save Changes

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Optimize Database
Re-enable them in the properties of your libraries

Verify that you have “Generate video preview thumbnails” not set to ‘Never’ under
Settings - Server - Library

Leave the rest to the nightly server maintenance.

1 Like
3

Thank you very much, I will try this ASAP on a “small” library and if tonight during maintenance all is fixed I will extend it to other libraries.

I’ll let you know!

4

You can also Plex Dance the files, which will trigger then getting regerated.

5

Unfortunately this is not an option in my case, since my library is HUGE (~70 TB) and have LOTS of custom metadata, covers and media review done manually during the years…

6

Sorry for the late response,
but good news! Your solution worked like a charm!

I needed a bit of time just to be sure, since the rebuild of my library is taking days since my library is huge.

Thank you very much for your help!

7

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