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False "Duplicate" status obstructs Sync

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chrisjj:
When I send tracks to a device, MC falsely marks some as Duplicate, preventing them syncing.

As requested by AlexB at http://yabb.jriver.com/interact/index.php?topic=56222.msg383787#msg383787 , I have done a test on a small library with logging. With about 1938 tracks in the library, I send 67 by the same artist to a device (hard disc folder), and I get 3 false-marked as duplicate. Here is the log. http://wiki.tango.info/mul/User:Chrisjjj%5CJRMC14_False_Duplicates_log

Any idea what is up? Thanks.

Alex B:
I think the log does not expose the filenames or any other details of the individual files.

I wonder if MPL files could give us more information.

Could you do the following?

1) Clear the device and delete the Database.mpl file if it is stored elsewhere (It's location can be defined by setting a database path in the Handheld options).
2) Create playlist of those 67 files. Export the playlist in MPL format.
3) Sync the playlist.

Pack the exported playlist and the newly created Handheld database file (Database.mpl) in a zip package, upload it somewhere and post a link here or attach the zip file to your reply if you have that option (check the additional options in the Post Reply form). Also list the fles that didn't sync in your reply.

EDIT

Matt posted immediately after me. Most likely you can find the cause of the problem by doing as he instructed.

Matt:
Duplicate detection is based on creation of a 'match key' for each file.  By default, the match key is built on (basically) this expression:
[Name]-Clean([Artist], 1)-[Album]-[Genre]-FormatNumber([Track #, 0])-[Media Type]

You could add that expression as a column to any file view and sort by it.  Can you see duplicate files?  If so, can you see why?  Perhaps 'Clean' is making the artists the same when you don't want that?

chrisjj:
> the match key is built on (basically) this expression: [Name]-Clean([Artist], 1)-[Album]-[Genre]-FormatNumber([Track #, 0])-[Media Type]

Thanks Matt. It would have been useful to know that three weeks ago when I asked.

I'm amazed MC thinks that Duplicate marking without even inspecting the audio is ever going to work reliably. Yes, all the false duplicates have non-unque values for that expression.

How does one change from this default to e.g. Filename?

Matt:
You need to change tag information to make the files unique.  You can't put two "different" files with identical tags on a device.

Match keys for a handheld are based on tag information since this is immutable across systems and devices.  Filenames are not suitable match keys, since devices use different filenames than the source system and moving between multiple systems would make a mess.

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