[Q] mp4 files won't play when copied to phone via USB - Windows Phone 7 Q&A, Help & Troubleshooting

Motivation: I am creating a more organized folder structure on my phone (LG Quantum) and am using the hack that allows the phone to be seen as a USB storage device.
1. I copy all the JPG and MP4 files from the phone to my computer.
2. I use exiftool to organize the files into folders by date and rename the files with more informative date-related names.
3. I then recopy the directory structure on the computer onto the phone.
It works very nicely for the JPG files. However, the MP4 files, that were originally created on the phone, only show up as video files with black thumbnails, and these files do not play.
If I use Zune to sync them, they go into the Video folder and DO PLAY on the phone. However, I do not want them in the Video folder. I want them in the structured directories in the "Pictures" folder that I made (I want pictures and videos in the same folders by date).
I can copy the files in the phones Video folder to the Pictures directory structure I created on the phone, but a bunch of black thumbnails are left in the Video folder that don't play, making it very inconvenient (since I only want music videos or movies in the Videos folder).
Does anyone know why MP4 files created by the phone will not play when copied to the computer and then back to the phone via USB?
Is this a bug? Any hacks to fix?
Thank you.

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[Q] Transferring Videos from Xbox Video on Desktop to Surface

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Ooops.. wrong button...
http://www.teamradicus.com/post/Surface-and-SD-Card.aspx
http://superuser.com/questions/497353/using-microsd-cards-with-metro-apps-on-the-surface-rt
e.mote said:
Ooops.. wrong button...
http://www.teamradicus.com/post/Surface-and-SD-Card.aspx
http://superuser.com/questions/497353/using-microsd-cards-with-metro-apps-on-the-surface-rt
Click to expand...
Click to collapse
That's not the problem, I've already used the NTFS mounted folder method to get the SD card mapped to the Video library. Files from Xbox Video correctly download to the card, and files on the card correctly show up in the Videos library. But for some reason, my shows aren't available offline, even though I have the files with the correct paths in Videos library. That leads me to believe there must be a database of downloaded files somewhere on the device, and it just doesn't "see" the files that where transferred from another device.

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