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You mean the mp4 with the car racing simulation on the home page? It is output without any problems for me. Clear the cache of your browser or try to open the page with another browser.
The problem occured with combination of mp4 format and h264 codec of the videoclip. When I exported the clip as web profile and YouTube standard target at my OpenShot Editor, it started to work immediately. So it looks like I solved the problem faster then came your help. Thank you anyway. I just want to warn other wordpress users that there may be an error when trying to upload mp4 video with h264 codec to the page.
Glad you were able to solve it yourself. Interesting way. You are welcome to mark the topic as solved.