How does emby determine when a file has changed/needs scanned again?

[Edrock200 53]

I am migrating from one storage solution to another. To achieve this, I mergerfs'd the old storage path and new storage path together into the same path emby has for media.

I'm using rclone to move the data from old storage to new storage, but with mergerfs, the file, path, etc. all remain the same. I am using the metadata flag so that permissions and time stamps remain identical. 

However, based on the logs, emby still seems to be ffprobing every copied file again during full library scans. 

I ran a checksum on a file that emby ffprobed again on the old path file and new path file and they are identical. My Plex server using the same path doesn't appear to be flagging the copied files as "changed." Is there some other attribute that emby is looking at? How does emby determine if a file is the same or changed? Thanks in advance for any insight. 

Edited September 2, 2024 by Edrock200

[Luke 42079]

HI, Emby Server looks at the date modified timestamp of the files, as well as nfo files if you have those.

[Edrock200 53]

That's probably it then. The NFO files may have regenerated. Thank you!

Edited September 2, 2024 by Edrock200

[Edrock200 53]

One more question. Is it possible for an emby full scan to backslide? Been checking on a full scan. I turned off scheduled scans and kicked off a full to let it get through one cycle before turning the schedule back on. It was at 94.4%. I just checked again and it's at 92.9%.

[GrimReaper 4740]

9 minutes ago, Edrock200 said:

Is it possible for an emby full scan to backslide?

No. 

10 minutes ago, Edrock200 said:

I turned off scheduled scans and kicked off a full to let it get through one cycle before turning the schedule back on. It was at 94.4%. I just checked again and it's at 92.9%

Most likely manual full scan completed and another scan started and is currently at 92.9%. 

[Edrock200 53]

5 hours ago, GrimReaper said:

No. 

Most likely manual full scan completed and another scan started and is currently at 92.9%. 

Except, I removed all scheduled scans. 

[Happy2Play 9781]

Without parsing the log it is really hard to say but I have never seen a scan backslide but have seen a scan finish and another start in an endless loop for hours as I was editing media outside of Emby.

[Luke 42079]

9 hours ago, Edrock200 said:

Except, I removed all scheduled scans. 

The realtime monitor could have started one, if that option is enabled on your libraries.