Bug: Emby shows no art on all media entries that existed when the metadata directory was unmounted

[gu5gus 0]

Hello, I found a bug. The bug is that Emby shows no art on all media entries that existed when the metadata directory was unmounted or otherwise made unavailable to Emby (e.g. permissions). It appears that this bug has been around for a long time because I found mention of this behavior from many years ago. It is explained below.

Steps to reproduce:

1. Create a server and store your metadata on a separate network share from your media collection.
2. Scan your library, populating the media entries with artwork.
3. Unmount your metadata share or otherwise make it unavailable. I'm not sure how long the metadata has to be down for this to be reproduced. For me the metadata share was down for a day or two.
4. Use an Emby client to browse the library. The media entries are in the library but no artwork is shown as expected.
5. Remount your metadata share.
6. Add new media to your library.
7. Observe the following:
   1. The new media works just fine, artwork is shown as expected.
   2. The media that was in the library at the time of being unmounted will never be shown with artwork again. I say never but it has been about 2 months with nearly daily use.
   3. This is resolved by choosing to refresh the metadata for a media entry and choosing to redownload all artwork. After doing this, that media will now show artwork.

For many of us it is not reasonable to redownload all artwork for all affected media. 

 

Expected behavior:

Media that is tagged as its artwork no longer available should have its artwork redownloaded at the next library scan. 

 

Logs are attached in case they're useful. If there is a command somewhere to mass redownload artwork I would love to know about it. 

emby no art after metadata was unmounted.zip

[gu5gus 0]

I should add that in step 3, a library scan has most likely occurred while the metadata share was unmounted.