Windows 10: COPIED .MP4 FILES WON'T PLAY!

I have copied several hundred .mp4 movie files from my WD 5TB My Passport Portable External Hard Drive over to a newly acquired 16TB portable SSD drive. A small quantity of the copied files plays fine on the SSD, but the majority of the files don't! The properties of the files on both drives appear to be the same.NOTE: All of the .mp4 files on the WD 5TB My Passport Portable External Hard Drive play fine using VLC Media Player and/or Windows Media Player. I am using a desktop PC with Windows 11 Pro with a 64-bit OS. What could possibly be the problem here?A prompt response will

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MP4 File will not play

Based on the information you have provided, considering that you are encountering the same issue when playing the MP4 file on different applications, then it's possible that the issue is with the file itself. This could be caused by an interruption or an
issue while the MP4 is being copied. I suggest that you create a new copy of the file and check if the issue persists.

Let us know how it goes and we'll assist you further if needed.

 

Playing MP4 files

MP4 is a container file, a lot depends on the codecs within that.
MP4 can be played with Windows 10 with Films & TV, Photos, Windows Media Player, and VLC.
If those can't then there must be something odd/unusual in the file.

Right click the File > Properties > Details Tab.
see if that gives you more info, should be some info on the video/audio but not codecs.

Try the suggestions from post #3.

You have to be careful as viruses are propogated by people simply changing the filename extension and auto-forwarding via an infected PC and a compromised address list.
So a targeted scan with AV is necessary for every file attachement even if apparently from someone you know.

 

Playing MP4 files

That may be so and nice for you, but I have rechecked and installed the latest 64 bit version from the owner’s site. It does’ntp;ay