QuickTime Player does not play FotoMagico mp4

Hi, big problem with Mac OS QuickTime Player. After checking the QuickTime exported .mp4 there comes an error message for each FotoMagico .mp4 file. The file will not be played.
It plays only when I press the space bar. What happens here?

Edit: Found it - the mp4 extension was linked to Lumafusion. After pressing cmd + I I have set - open with QuickTime Player for a l l files. After this, all mp4 files will play with QuickTime. player.

Rainer

Thanks for sharing your experience. I’m glad you found the solution!