How I fixed 100% of my album art, a quick guide. Note, I already had album art either embedded in tags or in folder titled cover.jpg before I started this process. I was just missing 80% being displayed on the NW-A45 due to either wrong version ID3v2 tags or jpgs stored as progressive rather than baseline. As discussed earlier in the thread, Baseline is required by the NW-A45 in order to display correctly AND it has trouble with id3V2.4. I was not about to spend an entire day doing all of this manually so here is the closest I came to an automated solution. I now have 100% of tags showing correctly apart from one folder full of V/A compilations which just seem to be handled really badly by just about all software and will have to be done manually.
This solution can be done without re-transferring all of your files which is a big deal. We will be using TagScanner and Sony Music Center.
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First: open TagScanner, go to program options in the top right and under TAGS, ensure you have it set to ID3v2.3, and that your coverart filename matches the bulk of what you are dealing with (cover.jpg). I set quality to 90% @ 600x600 pixels.
Click the back arrow in the top left.
Next: Click the folder icon with the green + sign and point it to the MUSIC directory on your WALKMAN device, ensuring search subfolders is checked.
Once all of the music has been imported, press CTRL-A to select all files, drop down the KEEP menu and select Recompress. This by default should have discogs cleanup selected, I'm not sure if this matters.
Press SAVE down the bottom right and TagScanner will start processing your files and saving tags and art in a proper, readable format.
Once this is done, repeat the process for the music directory on your microSD card.
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Disconnect your device and let it update the database. Now, go to album view and scroll through your albums. You will notice now that most of the lag is gone! I think this is a side effect of having all of your tags + artwork recompressed into correct format.
Use a pen and paper or notepad etc to write down any remaining albums that still don't have artwork.
Open Sony music centre and delete your entire library making sure to select delete library only, not the files on your computer. Let's face it, this software is terrible apart from the one thing we are about to do with it.
Also turn off automatically analyse imported tracks and 12-tone analysis. This is what crashes Music Center constantly, and also what messes up all of your perfectly organised music.
Open My Computer and drag both of your music folders from the walkman to Music Center. When asked if you want to copy it to managed location, select NO.
Now, go through the list you made earlier and either drag appropriate cover art to the albums that are missing it or use the Get Cover Art function from gracenote.
That's it. This has been extraordinarily frustrating; I can't work out for the life of me why the walkman has such a hard time dealing with album art.