Hi All, new here Thanks for admission.

I installed allvideos

Added a mediamap images/videos

Added mp4 extension and Mime

Uploaded mp4 through built in upload option

A thumbnail appeared (see pic) but .... on preview
only black screen with text Error loading this resource.

Tried everything possible but no result. What am
I doing wrong ???

The file in joomla is 5,74mb The original in my pc is
5,879

Any help is appreciated.

The problem is that if the preview is not working neither is the link to it It gives a failt on the website. Something with html-5 I now linked it to you tube Works fine.
But it would be nice to run mp4 directly.

So the question still remains Why can i not run the preview.