Video files not playing

I have 2 video files on this test page.
Both file names are correct and their paths are also correct (triple and quadruple checked)
Yet one plays and the other does not!
The one that does not play says “Unable to play media. Media format not supported”
Both are .mp4 files and both are in the same folder on my server.
Both videos play just fine on my desktop computer so I know the files are not corrupted.
I tried switching the video files to another folder and had the exact same problem1

Something is very wrong with my folder system(?)
Can anyone help solve this puzzle?
This happens with any video player (Yendifplayer, FV Flowplayer, etc.)

Note: A while back something went wrong with my wordpress installation when one theme broke my site. I restored the site from a previous backup and that’s when the problem began.

• This topic was modified 3 years, 3 months ago by Pesi Unwalla. Reason: added a point

The page I need help with: [log in to see the link]