PMS not generating thumbails (neither automatically nor forced in cli by --generate)

Plex Media Server NAS & Devices
21

I can’t get thumbnails to generate via CLI either. New videos are getting thumbs made, but some older ones are still missing thumbs. So far I have tried:

Wait until new videos have been processed over a few days:
Tell Plex via CLI to force analyze/full a video on 1 item via -i - Nothing instantly, or the next tasks phase.
Tell Plex via CLI to force thumbnail generation on 1 item, via -i - Nothing instantly, or the next tasks phase.
Tell Plex via CLI to generate thumbnail on 1 folder via -d - Nothing instantly, or the next tasks phase.

I know my setup is proper, since new items get thumbnails in a decent time. I am not sure why I cannot force triggering them though. I have tried almost all I can think of, except switching Docker containers (why would it be that???). Now, I have had a few corrupted DBs that I had to restore from backup, so, maybe that orphaned the thumbnails, and now it won’t re-generate? Or perhaps it’s if I ever moved the files? I am not sure.

22

Do you have your plex configured to allow generating the thumbnails, and also allow this to run as a scheduled task with a wide time span?

23

I think I narrowed down how to make Plex process thumbnails, and it seems I have a considerable backlog as well. I first had to set my scheduled tasks to a very large window (12-24 hours). Doing that is not enough for it to start on it’s own though, I had to also run something like:
/usr/lib/plexmediaserver/Plex\ Media\ Scanner -g -x -p -o 3083

Which then triggered the queue (Plex seems to have an internal queue of items, as the one I specified has not been done yet, but about 100 others have been done, so we’ll see if it gets around to it or not.