Look For New And Changed Media Files Issue?

[rdeckard]

LMS v7.7.2/Windows XP SP3

Can someone tell me exactly what LMS considers a "changed" media file? I went in and changed genres on a few albums, then ran "Look For New And Changed Media Files".
The genre changes did not get detected or updated. Then I ran "Clear Library And Rescan Everything" and they were in fact detected and updated.

Does the scanner store and use file modified times in the database for comparison?
If not, what is the criteria?

Thanks!

[aubuti]

LMS does indeed use the file modification times for determining what is "new and changed." However, many tagging programs have a setting to choose whether or not the file modification time should be changed when tags are edited. Some people, such as yourself, may want to have the mtime changed so that a "new and changed" scan will work as expected. Other people prefer not to have the mtime changed, so that tag edits on old albums do not cause those albums to suddenly appear in the "New Music" screen (which also depends on mtime). Check the settings on your tagging program and adjust as needed.

[garym]

LMS v7.7.2/Windows XP SP3

Can someone tell me exactly what LMS considers a "changed" media file? I went in and changed genres on a few albums, then ran "Look For New And Changed Media Files".
The genre changes did not get detected or updated. Then I ran "Clear Library And Rescan Everything" and they were in fact detected and updated.

Does the scanner store and use file modified times in the database for comparison?
If not, what is the criteria?

Thanks!

I've found that only changing metadata on my files requires a full "clear and rescan" scan to pick those up.

[rdeckard]

LMS does indeed use the file modification times for determining what is "new and changed." However, many tagging programs have a setting to choose whether or not the file modification time should be changed when tags are edited. Some people, such as yourself, may want to have the mtime changed so that a "new and changed" scan will work as expected. Other people prefer not to have the mtime changed, so that tag edits on old albums do not cause those albums to suddenly appear in the "New Music" screen (which also depends on mtime). Check the settings on your tagging program and adjust as needed.

I use Mp3tag and the option to "preserve file modification time when saving tags" is definitely not checked, specifically for this reason. Is it possible that even though the scanner detected a change in time/date, it does not re-read all of the metadata/tags on a "look for new and changed" scan to save time?

[aubuti]

I use Mp3tag and the option to "preserve file modification time when saving tags" is definitely not checked, specifically for this reason. Is it possible that even though the scanner detected a change in time/date, it does not re-read all of the metadata/tags on a "look for new and changed" scan to save time?

I meant to add to my post that sometimes a "new and changed" doesn't pick up changes and a full rescan is required even when it shouldn't be. I have had many fewer problems with that since the switch back to SQLite, but I suppose it can still happen.