Zero byte size- many mp4s suddenly corrupted(!)

[thewallace 6]

I just had a really weird and frustrating thing happen on one of my 6TB film library HDs. Suddenly I found about eight hundred of my .mp4s have reverted to '0 byte' size and are unplayable. Oddly this only affected my x264 MP4s and not MKVs.  I'm running the newest Emby server and Emby Theater in Windows 10.
 

- I've done a chkdsk /f/r which found no errors.

- Permissions are all correct and resetting them makes no difference.

- no virus are running  

- renaming the extension and back doesn't change anything.

 

I notice when I log into my Emby account online I have two active servers with the same name. Could I have inadvertantly caused some sort of cross corruption somehow?  Anyone else ever had an issue like this? 

[Luke 42077]

Hi, emby doesn't modify media files so it would not have caused this. Hopefully you're able to find the cause.

[thewallace 6]

After lots of possible fixes all I can determine is that 'something' damaged my mp4s...not sure what. Despite all the methods that supposedly work I've decided to throw in the towel: the files are permentantly zero byte... so I deleted them all. 

Next task: spend the Summer reconstructing my Library. Glass half full! 

[Luke 42077]

Let us know how you get on. Thanks.