I Can't Play .MP4 and .mkv Files Backed up in Time Machine

I backed up My Macbook to an external hard drive in my passport / Time Machine.  I am attempting to play both .mp4 and mkv files in quicktime and vlc respectively.  They worked when they were on my computer, but I they won't open now.  I even tried to copy them to my computer and play them that way.  When I click on info, it shows the file size, and it seems normal.  I updated both Quicktime and vlc, and it still doesn't work.  Please help.

You wrote in your first post:
I even tried to copy them to my computer and play them that way.  When I click on info, it shows the file size, and it seems normal.
Then you wrote:
when it restored it, the file size was zero
Which of those statements is true?

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